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Hi-performance Regurator IC Series for PCs
2phase Switching Regulator Controllers for Graphic Card
BD95700MUV
No. 09030EBT19
Description BD95700MUV is a 2 phase switching regulator controller with high output current which can achieve low output voltage (0.4V ~ 3.3V) from AC/DC 5V or 12V. High efficiency for the switching regulator can be realized by utilizing an external N-MOSFET power 3 TM transistor. A new technology called H Reg is a Rohm proprietary control method to realize ultra high transient response against load change without phase compensation capacitance and resistance. For various applications, it is available to select the 3 types of N-MOSFET gate drive voltage (12V: for drive ability, 8V: for intermediate drive ability, 5V: for small real estate). Features 3 TM 1) H Reg Switching Regulator Controller without phase compensation capacitance and resistance 2) Ultra High Tolerance Internal Reference Voltage (+/- 1%) 3) Thermal Shut Down (TSD), Under Voltage LockOut (UVLO), Adjustable Over Current Protection (OCP), Over Voltage Protection (OVP), Short Circuit protection(SCP) built-in 4) Soft start function to minimize rush current during startup 5) Switching Frequency Variable (f=50kHz~1000kHz) 6) Internal Bootstrap Diode 7) High Tolerance Current Balance Function 8) VQFN024V4040 Package (4.0mm x 4.0mm x 1.0mm) 9) Integrated 1-/2-phase Switching Function Applications Graphic Cards, Desktop PC, Gaming Equipments, Digital Components Maximum Absolute Ratings (Ta=25) Parameter Input Voltage 1 Input Voltage 2 Input Voltage 3 Input Voltage 4 Input Voltage 5 Input Voltage 6 BOOT Voltage BOOT-SW Voltage UG-SW Voltage SW Voltage Power Dissipation Operating Temperature Range Storage Temperature Range Junction Temperature Symbol VCC VIN VCCDRV 5VCC REFIN BUSEN BOOT1, BOOT2 BOOT-SW UG-SW SW Pd1 Topr Tstg Tjmax Limit 15 *1 15 *1 15 *1 7 *1 7 *1*2 7 *1 30 *1 15 *1 15 *1 15 0.34 0+70 -55+150 +150 Unit V V V V V V V V V V W
*1 Do not to exceed Pd. *2 REFIN voltage can not go up higher than 5VCC voltage.
Operating Conditions (Ta=25) Parameter Input Voltage 1 Input Voltage 2 Input Voltage 5 Input Voltage 6 BOOT Voltage BOOT-SW Voltage CS Input Voltage DROOP Setting Resistor IOUT Setting Resistor RT Setting Resistor
Symbol VCC VIN REFIN BUSEN BOOT BOOT-SW CS1-/CS1+/CS2-/CS2+ RDROOP RIOUT RRT
MIN 4.7 3.3 0.4 0 4.5 4.5 0.4 0 0 10k
MAX 13.2 13.2 3.3 3.3 27 13.2 3.3 510k 5M 510k
Unit V V V V V V V
* This product should not be used in a radioactive environment.
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1/20
2009.04 - Rev.B
BD95700MUV
Technical Note
ELECTRICAL CHARACTERISTICS (Unless otherwise noted, Ta=25, VCC=5V, VIN=12V, REF=1.2V, RT=100k) Standard Value Unit Condition Parameter Symbol MIN TYP MAX [Total Block] Vcc Bias Current Icc 4 10 mA Vcc Standby Current ISTB 1.5 2.0 mA [5Vcc Block] 5Vcc Output Voltage 5Vcc 4.9 5 5.1 V 5Vcc Output Current I5Vcc 20 mA [UVLO Block] VCC Threshold Voltage Vcc_UVLO 4.2 4.5 4.7 V Low High VCC Hysteresis Voltage dVcc_UVLO 130 180 230 mV BUS EN Threshold Voltage BUS_UVLO 0.6 0.8 0.9 V Low High BUS EN Hysteresis Voltage dBUS_UVLO 5 25 50 mV 5Vcc Threshold Voltage 5Vcc_UVLO 4.1 4.3 4.5 V Low High 5Vcc Hysteresis Voltage dVcc_UVLO 100 150 200 mV [Reference Voltage Block] Internal Reference Voltage VREF 0.594 0.600 0.606 V REFIN=5VCC REFIN Offset Voltage VREFIN REF_IN-10m REF_IN REF_IN+10m V REFIN Input Voltage Range VREF 0.4 3.3 V REFIN Off Threshold Voltage Vth REFIN 4.5 5Vcc V [EN Threshold] EN Low voltage Enlow GND 0.3 V REFIN pin voltage input EN High voltage Enhigh 0.4 5Vcc V REFIN pin voltage input [Operating Frequency] Oscillation Frequency FOSC 500 kHz ON Time TON 100 200 300 nsec MIN OFF Time TOffmin 400 500 nsec [IREFOUT voltage Block] IREFOUT Voltage VIREFOUT 1.176 1.2 1.224 V IREFOUT Drive Current IIREFOUT 3 5 mA [FET Gate Driver Block] UG high side ON Resistance RonHGH 6 12 UG low side ON Resistance RonHGL 4 8 LG high side ON Resistance RonLGH 6 12 LG high side ON Resistance RonLGL 1 2 [Regulator for VCC] Output Voltage VCCDRV 7.2 8 8.8 V Vcc DRV Drive Current IVCCDRV 10 mA [Droop Block] Load Line Slope SLOPELL 40 nA DCR=5m Load Line Slope Gain SLOPEGAIN 0.75 0.8 0.85 [OCP (Over Current Protection) Block] Over Current Threshold OCPTH 0.95 1 1.05 V [OVP (Over Voltage Protection) Block] Over Voltage Threshold 1 OVPTH1 VREFx1.25 VREFx1.3 VREFx1.35 V REFIN=5Vcc Over Voltage Threshold 2 OVPTH2 REFINx1.25 REFINx1.3 REFINx1.35 V [SCP (Short Circuit Protection) Block] SCP Start up Voltage 1 VSCP1 VREFx0.45 VREFx0.5 VREFx0.55 V REFIN=5Vcc SCP Start up Voltage 2 VSCP2 REFINx0.45 REFINx0.5 REFINx0.55 V SCP Delay Time TSCP 1 ms [POK Detection Block] POK Threshold 1 POKTHLOW1 VREFx0.7 VREFx0.75 VREFx0.80 V REFIN=5Vcc POK Threshold 2 POKTHLOW2 VREFINx0.70 VREFINx0.75 VREFINx0.80 V
* Design Guarantee
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2/20
2009.04 - Rev.B
BD95700MUV
Block Diagram
Technical Note
VIN_BUS=12V
+
Vcc
BUSEN VCCDRV VCC 5VCC
5
OFF
2
8VReg Controller BG Driver Circuit
Vcc
BT1 UG1 SW1 LG1
L1
21 22
1
24 23
H3RegTM Controller
Vcc
Vout + +
3
0.6V
5VReg
3ms Soft Start
Vo Comp
REFIN/EN 15 AGND DROOP 12 RT IMAX/IOUT PGND FB 11 10 14 13
4.5V
17
CS1+ CS1-
BT2 VIN_EXT UG2 SW2
L2
4
Load Slope
CS2+ CS2-
Current Sense
Driver Circuit
OCP
18 19
Vcc
+
OFF OFF
20
1-/2-Phase Switch
LG2
BUSEN VCC 5VCC
UVLO Control Logic EN
TSD
8 7 9 6
CS2CS1CS2+ CS1+ SW2 SW1
IREFOUT /POK 16
EN BG BUFFER
SCP
FB REFIN or 0.3V
REFIN Vo or Monitor 0.78V Vout
OVP
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3/20
2009.04 - Rev.B
BD95700MUV
Pin Configuration
Technical Note
UG2
BT2
IREFOUT/ REFIN POK /EN PGND FB
18
SW2 19 LG2 20 VCCDRV 21 VCC 22 LG1 23
17
16
15
14
13 12 DROOP 11 RT 10 IMAX/
IOUT/ CS2+ CS2-
9 8
SW1 24
7 1
UG1
2
BT1
3
4
5
6
CS1-
5VCC AGND BUSEN CS1+
Pin Function Table PIN No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Exposed Pad PIN Name UG1 BT1 5VCC AGND BUSEN CS1+ CS1CS2CS2+ IMAX / IOUT RT DROOP FB PGND REFIN/ EN INREFOUT/ POK BT2 UG2 SW2 LG2 VCCDRV VCC LG1 SW1 Supply Voltage for UG1 5V Regulator Output (Iomin=20mA) Sense GND Bus Enable, Power Supply Monitoring Pin Positive Input of Current Sensing 1 Negative Input of Current Sensing 1 Negative Input of Current Sensing 2 Positive Input of Current Sensing 2 Current Limit/Output Current Indication Switching Frequency Setting Droop Control of the Load Line Output Voltage Feedback Pin Power GND Pin External Reference Input and Enable Pin Internal Reference Voltage Output and Power Good Output Pin Supply Voltage for UG2 High Side FET Gate Drive Pin 2 Switch Node for Channel 2 Low Side FET Gate Drive Pin 2 Driver for External Linear Regulator Supply Voltage Pin Low Side FET Gate Drive Pin 1 Switch Node for Channel 1 FIN PIN Function High Side FET Gate Drive Pin 1
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4/20
2009.04 - Rev.B
BD95700MUV
Technical Note
Pin Descriptions UG1 (Pin 1), UG2 (Pin 18) These are the voltage supply pins to drive the Gate of the high side FET. This voltage swings between BT1/2 and SW1/2. High-speed Gate driving for the high side FET is achieved due to the low on-resistance (3 ohm when UG is high, 2 ohm when UG is low) of the driver. BT1 (Pin 2), BT2 (Pin 17) These are the voltage supply pins to drive the high side FET. The maximum absolute ratings are 35V (from GND) and 15V (from SW1/2). BT1/2 voltages swing between VIN+VCC and VCC during active operation. 5VCC (Pin 3) This is the internal 5V regulator output pin. The minimum output current capability is 20mA. AGND (Pin 4) This is the ground pin for IC internal circuits. It is equivalent to FIN voltage. BUSEN (Pin 5) This pin monitors the supply input VIN through resistance divider. The POR rising threshold level is set to 0.8V. Cs1+ (Pin 6), Cs2+ (Pin 9), Cs1- (Pin 7), Cs2- (Pin 8) These pins are connected to both sides of the current sense resistance or Inductance (DCR sensing) to detect output current. IMAX / IOUT (Pin 10) This pin has multiple functions such as the output current indication, OCP (Over Current Protection) limit setting, and the output voltage load line adjustment pin. BD95700MUV detects the voltage between Cs+ pin and Cs- pin and limits the output current (OCP) using resistance connected between IMAX/IOUT/Droop and GND. A very low current sense resistor or inductor DCR can also be used for this platform. RT (Pin 11) This is the pin to adjust the switching frequency based on the resistance value. The frequency range is f=50KHz - 1000KHz. DROOP (Pin 12) This pin can be used for the load slope setting of the output voltage. FB (Pin 13) This is the output voltage feedback pin. It is possible to adjust the output voltage using external resistor divider based on the equation, REFINFB. However, FB becomes 0.6V when REFIN=5VCC. PGND (Pin 14) This is the power ground pin connected to the source of the low side FET. REFIN/EN (Pin 15) This is an internal or external reference voltage selectable pin. If REFIN is pulled up to 5VCC, internal reference voltage (0.6V) is used. If REFIN is driven by an external voltage ranged 0.4V to 3.3V, external voltage of REFIN voltage is used. It is very convenient for synchronizing external voltage supply. The IC controls the output voltage (REFINFB). And also this pin is used for enable function. If REFIN is less than 0.3V, the whole circuit is shut down. IREFOUT/POK (Pin 16) This pin is internal reference voltage output and power good output. During start up, this pin voltage is low. This pin becomes high impedance when FB pin voltage goes beyond 75% of specified FB voltage after soft start ends. SW1 (Pin 24), SW2 (Pin 19) These are the source pins for the high side FET. The maximum absolute ratings are 15V (from GND). SW1/2 voltage swings between VIN and GND. LG1 (Pin 23), LG2 (Pin 20) This is the voltage supply to drive the Gate of the low side FET. This voltage swings between VCC and PGND. High-speed Gate driving for the low side FET is achieved due to the low on-resistance (2 ohm when LG1/2 is high, 0.5 ohm when LG1/2 is low) of the driver. VCCDRV (Pin 21) This is the supply voltage pin to drive an external NPN/N_MOSFET for 8V linear regulator. The maximum absolute rating is 15V. VCC (Pin 22) This is the power supply pin for IC internal circuit and driver circuit. The maximum circuit current is 10mA. There are 3 usages depending on a supply voltage for driver (5V, 8V, and 12V). It is recommended that a 0.1uF bypass capacitor be put in this pin to avoid voltage fluctuation when the VCC is supplied from 5V or 12V rail directly from the actual platforms. If 8V is used for the supply voltage, this pin is connected to the LDO output. In this case, it is recommended that at least 10uF ceramic capacitor be input to avoid oscillation.
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5/20
2009.04 - Rev.B
BD95700MUV
Technical Note
Explanation of Operation The BD95700MUV is a synchronous buck regulator controller incorporating ROHM's proprietary H3RegTM CONTROLLA control system. When VOUT drops due to a rapid load change, the system quickly restores VOUT by extending the TON time interval. Thus, it serves to improve the regulator's transient response.
3 TM H Reg control (Normal operation)
FB REF
When FB pin voltage (Vout) falls to a threshold voltage REF, the drop is detected, activating the H3RegTMCONTROLLA system. TON= REF 1 x VIN f [sec](1)
UG1
UG2
UG output is determined with the formula above. LG outputs until the status of VOUT is lower than REF after the status of UG is off. Note: REF is an internal or external reference voltage. If the internal reference is utilized, REF=0.6V. If the external reference is utilized, REF = REFIN pin voltage.
Phase switch function VIN_EXT BUSEN VOUT REF UG1 UG2 T 2-phase 2T Single-phase Stand-by 2-phase
The IC normally operates in 2-phase mode, but when the input voltage on the VIN_EXT pin is cut off, the IC latches into single-phase mode. The IC will remain latched in this mode (even if a voltage is reintroduced onto the VIN_EXT pin) until the voltage is cycled on any of the EN, VCC or BUSEN pins. It will then return to two-phase mode.
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6/20
2009.04 - Rev.B
BD95700MUV
Timing Chart Soft Start Function
Technical Note
REFIN TSS SS
Soft start is activated when REF hits its enabling threshold (VCC, 5VCC, and BUSEN have to be beyond their own UVLO thresholds). Current control takes effect at startup, enabling an output voltage "ramping start." Soft start timing and incoming current are calculated with formulas (2) and below. Soft start time (TSS) 3msec (fixed)
VOUT
Incoming current IIN= CoxVOUT 3msec [A] (2)
IIN
(Co: Output capacitor)
Output Over Voltage Protection
FB
REF x 1.3
UG
When the FB pin voltage becomes REF x 1.3, the output over voltage protection is activated and Low side MOSFET becomes ON to lower the output voltage (LG=High, UG=Low). When the output voltage goes back down to the specified level, the whole circuit becomes the normal operation mode.
LG
Switching
Short Circuit Protection with Timer Latch REF x 0.5 Short Circuit Protection kicks in when output falls to or below REF x 0.5. When the programmed time period elapses, output is latched OFF to prevent destruction of the IC. Output voltage can be restored either by reconnecting the REFIN pin (ON OFF ON) or disabling UVLO (HIGH Low High).
FB
TSCP
SCP
REFIN/UVLO
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7/20
2009.04 - Rev.B
BD95700MUV
External Component Selection 1. Inductor (L) selection
Technical Note
IL
The inductor value is a major influence on the output ripple current. As formula (3) below indicates, the greater the inductor or the switching frequency, the lower the ripple current. IL= (VIN-VOUT) x VOUT L x VIN x f [A](3)
VIN
IL VOUT L Co
The proper output ripple current setting is about 30% of maximum output current. IL=0.3xIOUTmax/2. [A](4) L= (VIN-VOUT) x VOUT IL x VIN x f [H](5)
(IL: output ripple current; f: switch frequency) Output Ripple Current Passing a current larger than the inductor's rated current will cause magnetic saturation in the inductor and decrease system efficiency. In selecting the inductor, be sure to allow enough margin to assure that peak current does not exceed the inductor rated current value. To minimize possible inductor damage and maximize efficiency, choose a inductor with a low (DCR, ACR) resistance. 2. Output Capacitor (CO) Selection
VIN
At least 20mV ripple voltage of the FB voltage is recommended by taking the equivalent series resistance and inductance into account. Output ripple voltage is determined as in formula (6) below.
VOUT
L
ESR ESL Co
VOUT=ILxESR+ESLxIL/TON(6) (IL: Output ripple current; ESR: CO equivalent series resistance, ESL:equivalent series inductance) In selecting a capacitor, make sure the capacitor rating allows sufficient margin relative to output voltage. Note that a lower ESR can minimize output ripple voltage.
Output Capacitor
Please give due consideration to the conditions in formula (7) below for output capacity, bearing in mind that output rise time must be established within the soft start time frame. Co 3msecx(Limit-IOUT/2) VOUT (7) Limit: Current Limit Value
Note: Improper capacitor may cause startup malfunctions. 3. Input Capacitor (Cin) Selection
VIN Cin
The input capacitor selected must have low enough ESR resistance to fully support large ripple output, in order to prevent extreme over current. The formula for ripple current IRMS is given in (8) below.
VOUT
L
IRMS=
IOUT 2
x
VOUT(VIN-VOUT) VIN IOUT 4
[A](8)
Co
Where VIN=2xVOUT, IRMS= Input Capacitor
A low ESR capacitor is recommended to reduce ESR loss and maximize efficiency.
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8/20
2009.04 - Rev.B
BD95700MUV
4.MOSFET Selection Pmain=PRON+PGATE+PTRAN Loss on the main MOSFET
VIN main switch
Technical Note
=
VOUT 4 x VIN
x RON x IOUT2 + Ciss x f x VDD+
2 VIN x Crss x IOUTx f
2 x IDRIVE
(9)
VOUT L Co
(Ron: On-resistance of FET; Ciss: FET gate capacity; f: Switching frequency Crss: FET inverse transfer function; IDRIVE: Gate peak current) Loss on the synchronous MOSFET
synchronous switch
Psyn=PRON+PGATE = VIN-VOUT 4 x VIN xRONxIOUT2+CissxfxVDD (10)
5. OCP Setting Resistance
IOUT
VIN_BUS IL L RL
VIN_EXT
VOUT
OCP threshold is determined by external OCP setting resistance (RIMAX) and IMAX calculated below. VCS1+VCS1250k Vcs2+Vcs2250k L rxC (11) )
L
RL
IIMAX =
Co
r
C r
Co
r
C r
(VCS1+VCS1-=ILx RL , RL= (RL: the DCR value of coil)
OCP
CS1+ CS1CS2+ CS2-
VIMAX
IMAX PIN
If VIMAX meet the following condition, OCP becomes activated. VIMAXIIMAXxRIMAX (VIMAX: OCP Setting Voltage, VIMAX=1V)
IIMAX
RIMAX
6. DROOP setting Resistance
VIN_BUS IL L RL L VIN_EXT IL RL
VOUT IOUT
The slope of the DROOP (VDROOP) can be set by the voltage drop caused by IDROOP and RDROOP. The equation is as follows.
r
C r
Co
r
C r
Co
DROOP PIN
CS1+ CS1CS2+ CS2-
IDROOP=
Vcs1+ - Vcs1 - 250
+
Vcs2+ - Vcs2 - 250 L r xc , IOUT 2IL )
RDROOP
IDROOP
( Vcs1+ - Vcs1 - = ILx RL, RL= VOUT=REFIN - RDROOP x IDROOP
(12)
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9/20
2009.04 - Rev.B
BD95700MUV
Technical Note
7. Setting output voltage The output voltage is REFIN = VOUT when VOUT is tied to the FB directly. The range of VOUT is 0.4V ~ 3.3V. VIN
BUSEN
H3RegTM REFIN FB CONTROLLA
R S
Q Driver Circuit VOUT
The output voltage is calculated as follows when resistor divider network is connected between the FB and VOUT. REFIN set 5Vcc. The range of Vout is 0.63.3V Vout = R1+R2 R2
BUSEN
x 0.6 [V](13) VIN
H3RegTM 0.6V FB CONTROLLA
R S
Q Driver Circuit
R1
VOUT
R2
8. Frequency Setting Resistance The Frequency at steady state is determined by resistance value connected to RT pin. But actual SW rising time and falling time are factored in due to the external MOSFET gate capacity or switching speed. As a result, On-Time increases. The frequency is determined by the following formula. VOUT VIN 1 Ton
f [Hz]=
x
(14)
Ton =
-12 10 xREFxRRT
2xBUSEN
+ 170x10-9
Ton : ON TIME
Consequently, total frequency becomes lower than the formula above. On-Time increases by Dead Time on the condition of zero cross point of inductor current. And also switching frequency increases as the output current increases due to the fixed On-Time and the influence of conduction loss. It is recommended that switching frequency be checked on large current condition (at the point where the inductor current doesn't become reversed from Vout).
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10/20
2009.04 - Rev.B
BD95700MUV
Technical Note
9. UVLO BD95700MUV has function to detect input UVLO voltage in each VCC, 5VCC, and BUSEN for output voltage to start up. If all these inputs go beyond their own UVLO threshold voltage, the soft start function kicks in. These threshold voltages have their own hysteresis voltage to avoid faulty operation caused by input noises and glitchs.
Hysteresis Window HysVCC
VCC 5VCC Hys5VCC
BUSEN
HysBUSEN
VOUT
Tss Output OFF Output OFF
Tss Output OFF
Tss Output OFF
Tss
Tss: Soft Start Time Output OFF
10. Current Phase Balance
VCCUVLO
5VCCUVLO
VCCUVLO
BUSENUVLO VOUT
VCCUVLO
VIN_BUS IL1 L1 RL1
VIN_EXT IL2 L2 RL2
r1
C1 r1
Co
r2
C2 r2
Co
CS1+ Vcs1 CS1Vcs2
CS2+ CS2-
BD95700MUV keeps the current phase balance between coil current IL1 and IL2 by controlling the status Vcs1 = Vcs2.And for that, it is needed to meet the reference formula below. L1 = L2 (RL1 =RL2), r1 = r2, C1 = C2. (15) For detecting the value of Vcs1 or Vcs2 exactly, it is also needed to meet the formula below. RL1 =
SW V
L1 r1xC1
(16) However, Vcs+ and Vcs- are fed a small current from current sense amplifier, and this current causes a slight difference in the actual value obtained from formula (16). Refer to formula (17) below: Vcs=V- Ixr (17)
r r2 I I Vcs Vcs+ Vcs-
This difference can be compensated for by adding resistor r2. Vcs=(V- I x r) + I x r2(18) To eliminate the difference, choose r2 to have the same value as r. Vcs=V(19)
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11/20
2009.04 - Rev.B
BD95700MUV
11. Vout small Ripple Voltage
VIN
Technical Note
SW VOUT
R3
R2
FB
R1
C=56pF
Resistor R3 and capacitor C (=56pF)are needed to stabilize switching operation when Vout ripple voltage is less than 20mV. The values of R1, R2 and R3 are determined as in the formula (20) below R1+R2 20k,10xR1 R3 (20)
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12/20
2009.04 - Rev.B
BD95700MUV
Reference Data
VOUT VOUT
Technical Note
VOUT
REFIN
REFIN
REFIN
BUSEN
BUSEN
BUSEN
VCC
VCC
VCC
Fig1.Sequence
Fig2.Sequence
Fig3.Sequence
VOUT REFIN
VOUT REFIN
VOUT REFIN
BUSEN
BUSEN
BUSEN
VCC
VCC
VCC
Fig4.Sequence
Fig5.Sequence
Fig6.Sequence
VOUT(100mV/div) VOUT(100mV/div) HG1,HG2(10V/div HG1,HG2(10V/div HG1,HG2(10V/div VOUT(100mV/div)
IOUT IOUT (20A/div) IOUT (20A/div) (20A/div)
Fig7.Load Transient Response (VCC=12V)
Fig8.Load Transient Response (VCC=12V)
Fig9.Load Transient Response (VCC=5V)
VOUT(100mV/div)
VOUT(100mV/div)
VOUT(100mV/div)
HG1,HG2(10V/div
HG1,HG2(10V/div
HG1,HG2(10V/div
IOUT
(20A/div)
IOUT (20A/div)
IOUT
(20A/div)
Fig10.Load Transient Response (VCC=5V)
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Fig11.Load Transient Response (VCC=8V)
Fig12.Load Transient Response (VCC=8V)
13/20
2009.04 - Rev.B
BD95700MUV
Reference Data
VOUT VOUT VOUT
Technical Note
SW1, SW2
SW1, SW2
SW1, SW2
LG1
LG1
LG1
Fig13.Continuos MODE (VCC=5V)
Fig14.Continuos MODE (VCC=8V)
Fig15.Continuos MODE (VCC=12V)
VOUT
VOUT REFIN
VOUT
SW1 SW1 SW1 1msec BUSEN IOUT
REFIN
Fig16.SCP Function
Fig17.SCP Function
Fig18.Soft Start
REFIN
390 370 350 f[kHz]
f = 400kHz 100 90 80 70 efficiency[%] 60 50 40 30 20
12V DRIVE 5V DRIVE 8V DRIVE
VOUT
330 310 290 270 250 0 10 20 Iout[A] 30 40 50
SW1, SW2
10 0 1 10 Iout[A] 100
Fig19.Reference Function
Fig20.Frequency range functionally
Fig21.Efficiency
IL1, IL2 IL1, IL2 IL1, IL2
SW1, SW2
SW1, SW2
SW1, SW2
Fig22.Current balance (Io=20A)
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Fig23.Current balance (Io=30A)
Fig24.Current balance (Io=40A)
14/20
2009.04 - Rev.B
BD95700MUV
Technical Note
BD95700MUV Evaluation Board Circuit with 5V Drive (VCC=5V input , VIN=3.3~12V input , REFIN=5VCC, Vout=1.2V )
VIN
R2
3.3V ~ 12V
PGND
C3
BUSEN 5
U1 BD95700MUV_VQFN24
BUSEN
BOOT1
2 C28
PGND PGND
R3 21 VCC 22 VCC5 3 REFIN
5V C25 C7
VCCDRV VCC
UG1
1
M2
M3 C5
C2
x
100k
PGND
5VCC
PH1 LG1
24 L1 PGND VOUT C13 C14 C15 C16 M4 M5
23
SW1 15
C18 AGND R7
AGND 4 DROOP 12 RT 11
BOOT2 UG2
C19
AGND
18
M6
M7 C21
C31
PGND
PGND
PGND
PGND
C17
REFIN
17
PGND
PGND
PGND PGND
PGND
PGND
C10
R8
RT LG2
20
100k
PH2
19 L2
PGND PGND
M8
M9
PGND
PGND
C12
PGND
R9 PGND
IOUT 10
IOUT CSN2
8 PGND
14 56pF PGND R15 FB 13
PGND CSN1 FB
7
R21
CSP2
9
R20
R16
AGND
AGND
BD95700MUV Evaluation Board Parts List Part No U1 M2 M3 M4 M5 M6 M7 M8 M9 C2 C3 C5 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 Value Company ROHM infineon infineon Infineon Infineon Infineon Infineon Infineon infineon KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA SANYO SANYO SANYO Part name BD95700MUV BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG CT32X5R106K25A CM05B105K16A CM105B105K16A CM316X5R106M06A CM21B106M06A CM21B106M06A CM21B106M06A CM21B106M06A NC641-643 NC641-643 NC641-643 Part No C17 C18 C19 C21 C23 C24 C25 C27 C28 C31 R2 R3 R7 R8 R9 R15 R16 R17 R18 R20 R21 L1 L2 Value 1uF 10uF 1uF 0.1uF 0.1uF 10uF 10uF 10uF 10uF 300k 30k 0 240k 3.6M 10k 4.87k 4.87k 10k 4.87k 4.87k 0.47uH 0.47uH Company KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM Cyntec Cyntec Part name CM05B105K06A CT32X5R106K25A CM105B105K16A CM105X5R224K25A CM105X5R224K25A CM316X5R106M10A CM316X5R106M06A CT32X5R106K25A CT32X5R106K25A MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 PCMB105T-R47MS PCMB105T-R47MS
10uF 1uF 1uF 10uF 10uF 10uF 10uF 10uF 820uF 820uF 820uF -
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C23
C24
REFOUT_POK 16 R18 C27
R17
POK
HS
CSP1
6
15/20
2009.04 - Rev.B
C11
C8
C9
DROOP
x
BD95700MUV
Technical Note
BD95700MUV Evaluation Board Circuit with 8V Drive (VIN=10.8~13.2V input , REFIN=5VCC, Vout=1.2V )
VIN
R1
3.3V ~ 12V
PGND
C3
R
BUSEN 5
U1 BD95700MUV_VQFN24
BUSEN
BOOT1
2 C28
PGND PGND
R3 21 VCC C25 C7 VCC5 3 REFIN 22
VCCDRV VCC
UG1
1
M2
M3 C5
C2
PGND
SW1 15
LG1 REFIN AGND UG2 DROOP
23
M4
M5
100k
5VCC
PH1
24 L1 PGND VOUT C13 C14 C15 C16
C18 AGND R7
AGND 4 DROOP 12 RT 11
BOOT2
C19
C21
18
M6
M7
C31
PGND
PGND
PGND
PGND
C17
17
PGND
PGND
PGND PGND
PGND
PGND
C10
R8
RT LG2
20
100k
PH2
19 L2
PGND PGND
M8
M9
PGND
PGND
C12
PGND
R9 PGND
IOUT 10
IOUT CSN2
8 PGND
14 220pF PGND R15 FB 13
PGND CSN1 FB
7
R21
CSP2
9
R20
R16
AGND
AGND
BD95700MUV Evaluation Board Parts List Part No U1 M2 M3 M4 M5 M6 M7 M8 M9 C2 C3 C5 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 Value Company ROHM infineon infineon Infineon Infineon Infineon Infineon Infineon infineon KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA SANYO SANYO SANYO Part name BD95700MUV BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG CT32X5R106K25A CM05B105K16A CM105B105K16A CM316X5R106M06A CM21B106M06A CM21B106M06A CM21B106M06A CM21B106M06A NC641-643 NC641-643 NC641-643 Part No C18 C19 C21 C23 C24 C25 C27 C28 C31 R1 R2 R3 R7 R8 R9 R15 R16 R17 R18 R20 R21 L1 L2 Value 1uF 10uF 1uF 0.1uF 0.1uF 10uF 10uF 10uF 10uF 10k 300k 30k 0 240k 3.6M 10k 4.87k 4.87k 10k 4.87k 4.87k 0.47uH 0.47uH Company KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM Cyntec Cyntec Part name CM05B105K06A CT32X5R106K25A CM105B105K16A CM105X5R224K25A CM105X5R224K25A CM316X5R106M10A CM316X5R106M06A CT32X5R106K25A CT32X5R106K25A MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 PCMB105T-R47MS PCMB105T-R47MS
10uF 1uF 1uF 10uF 10uF 10uF 10uF 10uF 820uF 820uF 820uF -
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
C23
HS
C24
REFOUT_POK 16 R18 C27
R17
POK
CSP1
6
16/20
2009.04 - Rev.B
C11
C8
C9
BD95700MUV
VIN
Technical Note
BD95700MUV Evaluation Board Circuit with 12V Drive ( VIN=12V input, VCC=12V input, REFIN=5VCC, Vout=1.2V )
R2
12V
PGND
C3
BUSEN 5
U1 BD95700MUV_VQFN24
BUSEN
BOOT1
2 C28
PGND PGND
R3 21 VCC C25 C7 VCC5 3 REFIN 22
VCCDRV VCC
UG1
1
M2
M3 C5
C2
PGND
SW1 15
LG1 REFIN AGND UG2 DROOP
23
M4
M5
100k
5VCC
PH1
24 L1 PGND VOUT C13 C14 C15 C16
C18 AGND R7
AGND 4 DROOP 12 RT 11
BOOT2
C19
C21
18
M6
M7
C31
PGND
PGND
PGND
PGND
C17
17
PGND
PGND
PGND PGND
PGND
PGND
C10
R8
RT LG2
20
100k
PH2
19 L2
PGND PGND
M8
M9
PGND
PGND
C12
PGND
R9 PGND
IOUT 10
IOUT CSN2
8 PGND
14 220pF PGND FB 13 R15 REFOUT_POK 16 R18 C27 AGND AGND
PGND CSN1 FB
7
R21
CSP2
9
R20
R16
R17
POK
HS
CSP1
6 C23 C24
BD95700MUV Evaluation Board Parts List Part No U1 M2 M3 M4 M5 M6 M7 M8 M9 C2 C3 C5 C7 C8 C9 C10 C11 C12 C13 C14 C15 C16 Value Company ROHM infineon infineon Infineon Infineon Infineon Infineon Infineon infineon KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA SANYO SANYO SANYO Part name BD95700MUV BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG BSC119N03SG BSC119N03SG BSC032N03SG BSC032N03SG CT32X5R106K25A CM05B105K16A CM105B105K16A CM316X5R106M06A CM21B106M06A CM21B106M06A CM21B106M06A CM21B106M06A NC641-643 NC641-643 NC641-643 Part No C17 C18 C19 C21 C23 C24 C25 C27 C28 C31 R2 R3 R7 R8 R9 R15 R16 R17 R18 R20 R21 L1 L2 Value 1uF 10uF 1uF 0.1uF 0.1uF 10uF 10uF 10uF 10uF 300k 30k 0 240k 3.6M 10k 4.87k 4.87k 10k 4.87k 4.87k 0.47uH 0.47uH Company KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA KYOCERA ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM ROHM Cyntec Cyntec Part name CM05B105K06A CT32X5R106K25A CM105B105K16A CM105X5R224K25A CM105X5R224K25A CM316X5R106M10A CM316X5R106M06A CT32X5R106K25A CT32X5R106K25A MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 MCR03 PCMB105T-R47MS PCMB105T-R47MS
10uF 1uF 1uF 10uF 10uF 10uF 10uF 10uF 820uF 820uF 820uF -
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
17/20
2009.04 - Rev.B
C11
C8
C9
BD95700MUV
Technical Note
Operation Notes 1. Absolute maximum ratings An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. If any over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses. 2. Connecting the power supply connector backward Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the power supply lines. An external direction diode can be added. 3. Power supply lines Design PCB layout pattern to provide low impedance GND and supply lines. To obtain a low noise ground and supply line, separate the ground section and supply lines of the digital and analog blocks. Furthermore, for all power supply terminals to ICs, connect a capacitor between the power supply and the GND terminal. When applying electrolytic capacitors in the circuit, not that capacitance characteristic values are reduced at low temperatures. 4. GND voltage The potential of GND pin must be minimum potential in all operating conditions. 5. Thermal design Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions. 6. Inter-pin shorts and mounting errors Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any connection error or if pins are shorted together. 7. Actions in strong electromagnetic field Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to malfunction. 8. ASO When using the IC, set the output transistor so that it does not exceed absolute maximum ratings or ASO. 9. Thermal shutdown circuit The IC incorporates a built-in thermal shutdown circuit (TSD circuit). The thermal shutdown circuit (TSD circuit) is designed only to shut the IC off to prevent thermal runaway. It is not designed to protect the IC or guarantee its operation. Do not continue to use the IC after operating this circuit or use the IC in an environment where the operation of this circuit is assumed. TSD on temperature [C] (typ.) Hysteresis temperature [C] (typ.) BD95700MUV 175 15 10. Testing on application boards When testing the IC on an application board, connecting a capacitor to a pin with low impedance subjects the IC to stress. Always discharge capacitors after each process or step. Always turn the IC's power supply off before connecting it to or removing it from a jig or fixture during the inspection process. Ground the IC during assembly steps as an antistatic measure. Use similar precaution when transporting or storing the IC.
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
18/20
2009.04 - Rev.B
BD95700MUV
Technical Note
11. Regarding input pin of the IC This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated. P-N junctions are formed at the intersection of these P layers with the N layers of other elements, creating a parasitic diode or transistor. For example, the relation between each potential is as follows: When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode. When GND > Pin B, the P-N junction operates as a parasitic transistor. Parasitic diodes can occur inevitable in the structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits, operational faults, or physical damage. Accordingly, methods by which parasitic diodes operate, such as applying a voltage that is lower than the GND (P substrate) voltage to an input pin, should not be used.
Resistor Pin A Pin A
P+ N P P+ N N
Transistor (NPN) Pin B
C B E B P P+ N C E
Pin B
N
P substrate Parasitic element
GND
Parasitic element
P+
N
P substrate Parasitic element
GND GND GND
Parasitic element
Other adjacent elements
12. Ground Wiring Pattern When using both small signal and large current GND patterns, it is recommended to isolate the two ground patterns, placing a single ground point at the ground potential of application so that the pattern wiring resistance and voltage variations caused by large currents do not cause variations in the small signal ground voltage. Be careful not to change the GND wiring pattern of any external components, either.
Power Dissipation
4.0
3.56W
Power dissipation:Pd [W]
3.0
4 layers (Copper foil area : 5505mm ) copper foil in each layers. j-a=35.1/W 2 4 layers (Copper foil area : 10.29m ) copper foil in each layers. j-a=103.3/W 2 4 layers (Copper foil area : 10.29m ) j-a=178.6/W IC only. j-a=367.6/W
2
2.0 1.21W 1.0 0.70W 0.34W 0 0 25 50 75 100105 125 150 Ambient temperature:Ta []
Fig.25 Thermal derating curve (VQFN020V4040)
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
19/20
2009.04 - Rev.B
BD95700MUV
Type Designations (Selections) for Ordering
Technical Note
B
D
9
Part No.
5
7
0
0
M
U
V
-
E
2
Part No.
Package MUV : VQFN024V4040
Packaging and forming specification E2: Embossed tape and reel
VQFN024V4040
4.00.1
4.00.1

Tape Quantity Embossed carrier tape 2500pcs E2
The direction is the 1pin of product is at the upper left when you hold
1.0MAX
1PIN MARK S
+0.03 0.02 -0.02 (0.22)
Direction of feed
( reel on the left hand and you pull out the tape on the right hand
)
0.08 S C0.2
1 24
2.40.1
6
0.40.1
19 18 13
12
0.75
0.5
2.40.1
7
+0.05 0.25 -0.04
1pin
Direction of feed
(Unit : mm)
Reel
Order quantity needs to be multiple of the minimum quantity.
www.rohm.com (c) 2009 ROHM Co., Ltd. All rights reserved.
20/20
2009.04 - Rev.B
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law.
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http://www.rohm.com/contact/
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