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M62212P/FP/GP
General Purpose DC/DC Converter
REJ03D0843-0200 Rev.2.00 Jun 14, 2006
Description
M62212 is designed as a general purpose DC/DC converter. This small 8-pin package contains many functions allowing simpler peripheral circuits and compact set design. The output transistor is open collector and emitter follower type. This makes the control STEP-UP, STEP-DOWN and INVERTING converter.
Feature
* * * * Wide operation power supply voltage range........ 2.5 to 18 V Low power consumption............................... 1.3 mA typ High speed switching is possible (300 kHz). Output short protection circuit and ON/OFF control are used. The dead-time control and the soft-start operation are possible * Package variation: 8-pin DIP/SOP/SSOP8
Applications
General electric products, DC/DC converter
Block Diagram
VCC 8 UVLO VTH: 2.3 V PWM Comp COSC 4 OSC - + + VCC - + 1.86 V R + - 1.15 V 0.3 V S Q Short protection circuit
1 Collector output 2 Emitter output
1.25 V VCC IN 7 OP Amp + - 1.25 V
6 FB
5 DTC
3 GND
Rev.2.00 Jun 14, 2006 page 1 of 8
M62212P/FP/GP
Pin Arrangement
M62212P/FP/GP Collector output Emitter output GND COSC 1 2 3 4 (Top view) Outline: PRDP0008AA-A (8P4) [P] PRSP0008DA-A (8P2S-A) [FP] 8P2X-A (SSOP-8) [GP] 8 7 6 5 VCC IN FB DTC
Rev.2.00 Jun 14, 2006 page 2 of 8
M62212P/FP/GP
Absolute Maximum Ratings
(Ta = 25C, unless otherwise noted)
Item Power supply voltage Output voltage Output current Power dissipation Thermal derating ratio Operating ambient temperature Storage temperature Symbol VCC VO IO Pd K Topr Tstg Ratings 19 19 150 625 (P) 360 (FP) 250 (GP) 5.00 (P) 2.88 (FP) 2.00 (GP) -20C to +85 -40C to +125 Units V V mA mW mW/C C C Ta = 25C Ta > 25C Conditions
Electrical Characteristics
(Ta = 25C, VCC = 12 V, COSC = 100 pF, unless otherwise noted)
Block All device Std. voltage section Error Amp. section Item Range of power supply voltage Standby current Standard voltage Line regulation Input bias current Open loop gain Unity gain bandwidth Output high voltage Output low voltage Output sink current Output source current Oscillator section Oscillation frequency Upper limit voltage of oscillation waveform Lower limit voltage of oscillation waveform Cosc charge current UVLO section Short protection circuit Cosc discharge current 1 Start-up threshold voltage Shut-down threshold voltage Hysteresis FB threshold voltage Latch mode "H" threshold voltage Latch mode "L" threshold voltage DTC charge current when start-up DTC discharge current 1 DTC charge current when stable state Output section DTC discharge current 2 Collector output leak current Collector output saturation voltage 1 Collector output saturation voltage 2 Symbol VCC ICC ST VREF LINE IB AV GB VOM+ VOM- lOM+ IOM- fOSC VOSCH VOSCL IOSC CH IOSC DlS1 VTH ON VTH OFF VHYS VTH FB VTH DTC VTL DTC ICH1 IDIS1 ICH2 IDIS2 ICL VSAT1 VSAT2 Min 2.5 1.19 1.82 2.2 20 -1 Limits Typ Max 1.3 1.25 5 80 0.6 6 -60 110 1.0 0.45 -40 10 2.3 2.25 50 1.86 1.15 0.3 -45 50 -10 15 0.3 1.6 18 1.8 1.31 12 500 2.62 400 -30 2.4 80 1 1.1 Units V mA V mV nA dB MHz V mV mA A kHz V V A A V V mV V V V A A A A A V V VIN = 1 V VIN = 1 V VHYS = VTHON - VTHOFF VIN = 1 V, VDTC = 0.7 V VIN = 1 V, VFB = 2.11 V VIN = 1 V, VFB = 2.11 V VDTC = 0.7 V, VFB = 2.11 V VDTC = 0.7 V, VFB = 2.11 V VDTC = 0.7 V, VFB = 0.7 V VDTC = 0.2 V, VFB = 2.11 V VCE = 18 V, VCC = 18 V Emitter GND, IC = 150 mA, VE = 0 V Emitter follower, IE = 50 mA, VC = 12 V VFB = 1.86 V VIN = 1 V Test Condition Output "OFF" status Voltage follower VCC = 2.5 to 18 V
Rev.2.00 Jun 14, 2006 page 3 of 8
M62212P/FP/GP
Application Circuit
L VIN + CIN 8 1 R2 4 COSC M62212P/FP/GP 7 6 5 + 3 2 D R1 + COUT VOUT
Figure 1 STEP-DOWN Converter with Current Buffer Transistor
Function Description
1) Soft start (The peripheral circuit is shown in Figure 1) When the power is turned ON, input terminal IN is at 0 V level. Therefore, the FB terminal is fixed to High level. The DTC terminal goes up gradually starting from 0 V due to the internal charge current and the external CDTC. When the level of DTC terminal reaches the lower limit of the triangular wave of the oscillator, PWM comparator and the output circuit go into operation causing the output voltage, "VO" of the DC/DC converter to rise. The charge current is designed to be approximately 45 A.
FB DTC
1.0 V OSC 0.45 V
OFF External Tr collector
ON
Figure 2
Rev.2.00 Jun 14, 2006 page 4 of 8
M62212P/FP/GP 2) DTC The dead time control is set by installing a resistor between the DTC terminal and GND. However, the DTC terminal serves as the short protection circuit also. Therefore, its set up depends on whether the short protection circuit is used and not. When the short protection circuit is used At this time, the charge current for DTC is approximately 10 A. Therefore, RDTC should be set to 40 k to 110 k. When the short protection circuit is not used At this time, the charge current for DTC is approximately 45 A. Therefore, RDTC is set to 12 k to 25 k. 3) Short protection circuit The short protection circuit used the timer latch system. It is determined by setting the capacity used for the soft start connected to the DTC terminal. Figure 3 shows the short protection circuit and the timing chart for various modes. When the power is turned on, the FB terminal goes high (approx. 2.3 V) and the DTC terminal goes low. (goes up slowly from 0 V) Thus, approximately 45 A current will flow when SW1: ON and SW2: OFF. The potential, namely the potential of the FB terminal is in the amplitude of the triangular wave, SW1 will be OFF and SW2 will be ON and approximately 50 A will flow into the DTC terminal. This discharge current will cause the DTC terminal to drop from 1.15 V. At this time, if the potential of the FB terminal goes to the control potential before the potential at the DTC terminal goes lower than 0.45 V which is the lower limit value of the triangular wave and if the potential of the FB terminal is lower than the potential of the DTC terminal, then the system is activated. When the output is shorted, the system is either activated or latched depending on whether the time for the high potential of the FB terminal reaches the potential of the control state is long or short. (For detail, see [II] and [IV] of the Mode) There are two ways to go back to operation after the latch to shut off output. Either method can restart with soft start. 1. Turning ON the VCC. 2. Make the FB terminal to go to the low potential of 1.86 V or less. Then, it is cancelled. [Mode Explained] [I] Mode............ Activation This is used when the FB terminal goes down to the control state potential when the DTC terminal is in up slope. In order for the activation to occur when the DTC terminal is in down slope, the FB terminal potential must go below the DTC terminal before the DTC terminal goes to 0.45 V. [II] Mode.............. Output short Activation The system is activated if the FB terminal potential goes below the DTC terminal potential before the DTC terminal goes to 0.45 V. If there is not enough time, the output is turned OFF. (Latched) [III] Mode............. ON/OFF control Activation This mode turns off the output by forcing the DTC terminal to go down. (The system) returns as in the case of the activation. [IV] Mode............. Output short (Latch) The output is turned OFF when the FB terminal potential did not go down to the control state before the DTC terminal went down to 0.45 V.
Rev.2.00 Jun 14, 2006 page 5 of 8
M62212P/FP/GP
Comp1 - + 1.86 V 1.25 V I1 10 SW1 DTC RDTC 90 k (900 mV) SW2 Note: SW1 and SW2 are turned ON by "H" signal. I3 60 Comp2 + - 1.15 V 0.3 V VCC I2 35
FB
(Initial RESET) R Q
S
CDTC
FB 2.0
DTC 1.15 1.0
DTC set up value (Tentative)
OSC 0.45
0 I1 I2 I3 ON ON OFF ON OFF ON ON OFF OFF
Charge 10
ON OFF ON
Discharge 50
ON OFF OFF
Charge 10
ON ON OFF
Charge 45
ON ON OFF
ON OFF ON
ON OFF OFF
Charge 10
ON OFF ON
Discharge 50
ON ON ON
Discharge 15
Charge Discharge 45 50
Charge Discharge 45 50
Activate [I]
Output short [ II ]
ON/OFF control [ III ]
Activate
Output short (Latch) [ IV ]
Figure 3 Short Protection Circuit and the Timing Chart of the Modes
Rev.2.00 Jun 14, 2006 page 6 of 8
M62212P/FP/GP
Constant Definition
Constant
TON TOFF TON + TOFF
Step-down Circuit
VO + VF VIN - VCE (sat) - VO 1 fosc TON + TOFF
Step-up Circuit
VO + VF - VIN VIN - VCE (sat) 1 fosc TON + TOFF 1+ 1 fosc TON TOFF - TOFF
Inverse Polarity Circuit
VO + VF VIN - VCE (sat) 1 fosc TON + TOFF 1+ 1 fosc TON TOFF - TOFF
TOFF (MIN)
1+ 1 fosc
TON TOFF - TOFF
TON (MAX)
D (MAX) COSC
TON (MAX) TON + TOFF 1 -12 75 x 103 x fosc - 16 x 10 (VIN - VCE (sat) - VO) x TON (MAX) IO VO VREF Not use short protection Use short protection -1 x R2
TON (MAX) TON + TOFF 1 -12 75 x 103 x fosc - 16 x 10 (VIN - VCE (sat) )2 x TON (MAX)2 x fosc 2 x VO x IO VO VREF -1 x R2
TON (MAX) TON + TOFF 1 -12 75 x 103 x fosc - 16 x 10 (VIN - VCE (sat) )2 x TON (MAX)2 x fosc 2 x VO x IO VO VREF -1 x R2
L (MIN) *1 R1 *2, *3
RDTC *4
VDTC (MAX) ICH1 VDTC (MAX) ICH2 ICH1 x tstart VDTC (MAX) IDIS1 x tshort VDTC (MAX) - VOSCL
VDTC (MAX) ICH1 VDTC (MAX) ICH2 ICH1 x tstart VDTC (MAX) IDIS1 x tshort VDTC (MAX) - VOSCL
VDTC (MAX) ICH1 VDTC (MAX) ICH2 ICH1 x tstart VDTC (MAX) IDIS1 x tshort VDTC (MAX) - VOSCL
CDTC *4
Calculate from start-up time Calculate from shat down time
note:
VF: Forward voltage of outer diode. VCE (sat): Saturation voltage of M62212 or saturation voltage of current buffer transistor Please setting the oscillation frequency first and calculate each constant value. 1. Please setting IO about 1/3 to 1/5 of maximum output current 2. |VO| = (1 + R1 ) x VREF R2 3. Please setting R2 about few k to score fo k because output voltage don't undergo a influence of input current (Terminal 7) 4. Please setting VDTC (MAX) to satisfy D (MAX), fixed from characteristics of D (MAX) - VDTC (MAX). ICH1 means DTC charge current when start-up (-45 A typ), ICH2 means DTC charge current when stable state (-10 A typ), VOSCL means lower limit voltage of oscillation waveform (0.45 V typ), and IDIS1 means DTC discharge current 1 (50 A typ). tstart means time interval when terminal voltage of DTC increase to VOSCL from lower voltage and to start switching at first. tshort means time interval when output is shut down after output is shorted
Rev.2.00 Jun 14, 2006 page 7 of 8
M62212P/FP/GP
Package Dimensions
JEITA Package Code P-DIP8-6.3x8.84-2.54 RENESAS Code PRDP0008AA-A Previous Code 8P4 MASS[Typ.] 0.5g
8
5
c
1
4
*1
e1
E
*2 D
NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET.
A
Reference Symbol
A2
Dimension in Millimeters
SEATING PLANE *3 b 3 bp e *3 b 2
e1 D E A A1 A2 bp b2 b3 c e L
Min Nom Max 7.32 7.62 7.92 8.7 8.9 9.1 6.15 6.3 6.45 4.5 0.51 3.3 0.4 0.5 0.6 0.9 1.0 1.3 1.4 1.5 1.8 0.22 0.27 0.34 0 15 2.29 2.54 2.79 3.0
JEITA Package Code P-SOP8-4.4x5-1.27
L
RENESAS Code PRSP0008DA-A
Previous Code 8P2S-A
A1
MASS[Typ.] 0.07g
8
5
HE
*1
E
F
1
Index mark
4
NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET.
c
A2 A1
*2
D
Reference Symbol
Dimension in Millimeters
*3 e y
bp
D E A2 A1 A bp c HE e y L
Detail F
Min Nom Max 4.8 5.0 5.2 4.2 4.4 4.6 1.5 0.05 1.9 0.35 0.4 0.5 0.13 0.15 0.2 0 10 5.9 6.2 6.5 1.12 1.27 1.42 0.1 0.2 0.4 0.6
A
Rev.2.00 Jun 14, 2006 page 8 of 8
L
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