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XC9223/9224 Series
1A Driver Transistor Built-In Step-Down DC/DC Converters Preliminary
APPLICATIONS Step-Down DC/DC Converters Built-in P-channel MOSFET Built-in Synchronous N-channel MOSFET (No Schottky Barrier Diode Required) High Efficiency Oscillation Frequency: : 94% (VIN=5.0V, VOUT=3.3V) : 1.0MHz, 2.0MHz
(Small Inductor for High Frequency Selectable)
October 7, 2004 V2
Green Operation Compatible HDD
: 0.23 : 0.25
Notebook computers CD-R / RW, DVD PDAs, Portable communication modems Digital cameras, Video recorders Various general-purpose power supplies
Synchronized with an External Clock Signal Ceramic Capacitor Compatible MSOP-10 / USP-10 Packages
GENERAL DESCRIPTION
The XC9223/9224 series are synchronous step-down DC/DC converters with a 0.23 (TYP.) P-channel driver transistor and a synchronous 0.25 (TYP.) N-channel switching transistor built-in. A highly efficient and stable current can be supplied up to 1.0A by reducing ON resistance of the built-in transistor. With a high switching frequency of 1.0MHz or 2.0MHz, a small inductor is selectable; therefore, the XC9223/9224 series are ideally suited to applications with height limitation such as HDD or space-saving applications. Current limit value can be chosen either 1.5A (MIN.) when the LIM pin is high level, or 0.5A (MIN.) when the LIM pin is low level for using the power supply which current limit value differs such as USB or AC adapter. With the MODE/SYNC pin, the XC9223/9224 series provide mode selection of the fixed PWM control or automatically switching current limit PFM/PWM control. As for preventing unwanted switching noise, the XC9223/9224 series can be synchronized with an external clock signal within the range of 25% toward an internal clock signal via the MODE/SYNC pin. For protection against heat damage of the ICs, the XC9223/9224 series build in three protection functions: integral latch protection, thermal shutdown, and short-circuit protection. With the built-in U.V.L.O. (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.8V or lower. The series' detector function monitors the discretional voltage by external resistors.
FEATURES
Input Voltage Range Output Voltage Range : 2.2V ~ 6.0V : 0.8V ~ VIN Can be set freely with 0.8V (+2%) of reference voltage by the external resistors. Oscillation Frequency Output Current Maximum Current Limit Controls Protection Circuits : 1MHz, 2MHz ( 15% accuracy) : 1.0A : 0.5A (MIN.) when LIM pin='L' : 1.5A (MIN.) when LIM pin='H' : PWM/PFM externally switching : Synchronized with an external clock signal : Thermal shutdown : Integral latch method (over current limit) : Short-circuit protection Soft-Start Time Voltage Detector : 3mS (TYP.) internally set : 0.712V detect, N-ch open drain output
TYPICAL APPLICATION CIRCUIT
CIN
TYPICAL PERFOMANCE CHARACTERICSTICS
Efficiency vs. Output Current
VIN=5.0V, FOSC=2.0MHz L=2.0H(CDRH4D28C), CIN=10F(ceramic), CL=10F(ceramic)
VIN VDIN
1 2 3 VDOUT 4 5
VIN VDIN AGND VDOUT FB
PGND LX CE MODE/ SYNC LIM
10 9 8 7 6 CE
L CFB RFB1
VOUT
MODE/SYNC LIM
Efficiency: EFFI (%)
CL (ceramic)
100 90 80 70 60 50 40 30 20 10 0 1
VOUT=3.3V VOUT=1.5V
RFB2
Output Current:
IOUT (mA)
1000 10000
10
100
Data Sheet
1
DC000019
XC9223/9224 Series
1A Driver Transistor Built-In Step-Down DC/DC Converters Preliminary
PIN CONFIGURATION
VIN 1 VDIN 2 AGND 3 VDOUT 4 FB 5
10 PGND 9 LX 8 CE 7 MODE/SYNC 6 LIM
PGND 10 LX 9 CE 8 MODE/SYNC 7 LIM 6
1 VIN 2 VDIN 3 AGND 4 VDOUT 5 FB
MSOP-10 (TOP VIEW)
USP-10 (BOTTOM VIEW)
* Please short the AGND pin and the PGND pin (pin no. 3 and 10) before use. * For mounting intensity and heat dissipation, please refer to recommended mounting pattern and recommended metal mask when soldering the pad of USP-10.
PIN ASSIGNMENT
PIN NUMBER 1 2 3 4 5 6 7 8 9 10 PIN NAME VIN VDIN AGND VDOUT FB LIM MODE/SYNC CE LX PGND FUNCTIONS Input Voltage Detector Input Analog Ground VD Output Output Voltage Monitor Over Current Limit Setting Mode Switch / External Clock Input Chip Enable Switch Power Ground
PRODUCT CLASSIFICATION
Ordering Information XC9223B 12345 XC9224B 12345 DESIGNATOR DESCRIPTION : Fixed voltage : 1.0 MHz : 2.0 MHz : MSOP-10 : USP-10 : Embossed tape, Standard feed : Embossed tape, Reverse feed SYMBOL 08 1
1 3
2
DC/DC Oscillation Frequency 2 A Package D
4
5
R Device Orientation L
Data Sheet
2
DC000019
XC9223/9224 Series
1A Driver Transistor Built-In Step-Down DC/DC Converters Preliminary
PACKAGING INFORMATION
MSOP-10
0.15+0.01
-
USP-10
0.53+0.10 -
2.7+0.05
3.00+0.10 -
4.90+0.10 -
MAX 0.6
2.6+0.06
.
3.00+0.10
0.15
0.25+0.06
0.30
.
-
0~ 5
O
0.86+0.05 -
(1.50)
2.30 (0.5) 0.2+0.05
(0.1)
Soldering fillet surface is not formed because the sides of the pins are not plated.
(0.2)
(0.5)
BLOCK DIAGRAM
0.075+0.025 -
LIM
Current Limit PFM
VIN
Error Amp.
FB
Comparator PWM
Logic
Buffer Driver
Current Feedback
LX
CE
Vref with Soft-Start, CE
PGND
Ramp Wave Generator, OCS VD Thermal Shutdown
MODE/ SYNC
PMW/PFM
AGND
VDOUT VDIN
Data Sheet
3
DC000019
XC9223/9224 Series
1A Driver Transistor Built-In Step-Down DC/DC Converters Preliminary
ABSOLUTE MAXIMUM RATINGS
Ta=25 OC PARAMETER VIN Pin Voltage VDIN Pin Voltage VDOUT Pin Voltage VDOUT Pin Current FB Pin Voltage LIM Pin Voltage MODE/SYNC Pin Voltage CE Pin Voltage LX Pin Voltage LX Pin Current Power Dissipation MSOP-10 USP-10 SYMBOL VIN VDIN VDOUT IDOUT VFB VLIM VMODE/SYNC VCE VLX ILX Pd Topr Tstg RATINGS - 0.3 ~ 6.5 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 50 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 - 0.3 ~ VDD + 0.3 2000 350* 150 - 40 ~ + 85 - 55 ~ + 125 UNITS V V V mA V V V V V mA mW
O O
Operating Temperature Range Storage Temperature Range
C C
* When implemented on a PCB.
Data Sheet
4
DC000019
XC9223/9224 Series
1A Driver Transistor Built-In Step-Down DC/DC Converters Preliminary
ELECTRICIAL CHARACTERISTICS
XC9223B081xx PARAMETER Input Voltage FB Voltage Output Voltage Range Maximum Output Current (*1) U.V.L.O. Voltage (*2) Supply Current 1 Supply Current 2 Stand-by Current Oscillation Frequency External Clock Signal Synchronized Frequency External Clock Signal Duty Maximum Duty Ratio Minimum Duty Ratio PFM Switch Current Efficiency (*3) Lx SW "H" On Resistance (*4) Lx SW "L" On Resistance (*4) Current Limit 1 Current Limit 2 Integral Latch Time (*5, *6) Short Detect Voltage Soft-Start Time Thermal Shutdown Temperature Hysteresis Temperature CE "H" Voltage CE "L" Voltage MODE/SYNC "H" Voltage MODE/SYNC "L" Voltage LIM "H" Voltage LIM "L" Voltage CE "H" Current CE "L" Current MODE/SYNC "H" Current MODE/SYNC "L" Current LIM "H" Current LIM "L" Current FB "H" Current FB "L" Current Lx SW "H" Leak Current Lx SW "L" Leak Current (*7)
Data Sheet
Topr=25OC SYMBOL VIN VFB VOUTSET IOUTMAX VUVLO IDD1 IDD2 ISTB FOSC FB=VFB x 0.9, Voltage which Lx pin voltage holding "L" level FB=VFB x 0.9 FB=VFB x 1.1 (Oscillation stops) CE=0V Connected to external components, IOUT=10mA Connected external components, SYNCOSC SYNCDTY MAXDTY MINDTY IPFM EFFI RLxH RLxL ILIM1 ILIM2 TLAT VSHORT TSS TTSD THYS VCEH VCEL VMODE/SYNCH VMODE/SYNCL VLIMH VLIML ICEH ICEL IMODE/SYNCH IMODE/SYNCL ILIMH ILIML IFBH IFBL ILxH ILxL VIN=CE=6.0V VIN=6.0V, CE=0V VIN=CE=MODE/SYNC=6.0V VIN=CE=6.0V, MODE/SYNC=0V VIN=CE=LIM=6.0V VIN=CE=6.0V, LIM=0V VIN=CE=FB=6.0V VIN=CE=6.0V, FB=0V VIN=LX=6.0V, VCE=0V VIN=6.0V, LX=CE=0V 5 FB=VFB x 0.9, Voltage which Lx becomes "H" when voltage applied to CE FB=VFB x 0.9, Voltage which Lx becomes "L" when voltage applied to CE LIM=0V, FB=VFB x 0.9 Current which Lx starts oscillation LIM=VIN, FB=VFB x 0.9 Current which Lx starts oscillation FB=VFB x 0.9, Short Lx by 1 resistance FB Voltage which Lx becomes "L" Connected to external components, CE=0V VIN, IOUT=1mA FB=VFB x 0.9 FB=VFB x 1.1 Connected to external components, MODE/SYNC=0V, IOUT=0.1mA Connected to external components, CE=VIN=5.0V, VOUT=3.3V, IOUT=200mA FB=VFB x 0.9, ILx=100mA IOUT=10mA, apply an external clock signal to the MODE/SYNC 25 100 0.5 1.5 1.2 1.2 1.2 -0.1 -0.1 -0.1 -0.1 -1.0 150 94 0.23 0.25 6 0.4 3 150 20 75 0 0.4 0.4 0.4 0.1 0.1 0.1 0.1 1.0 % % % mA % A A ms V ms
O O
CONDITIONS
MIN. 2.2 0.784 0.8 1.0 0.85
TYP. 0.800 1.8 380 30 1.00
MAX. 6.0 0.816 VIN 1.0 1.15
UNIT V V V A V A A A MHz
CIRCUIT
-
0.75
-
1.25
MHz
-DC000019
C C
V V V V V V A A A A A A A A A A
XC9223/9224 Series
1A Driver Transistor Built-In Step-Down DC/DC Converters Preliminary
ELECTRICIAL CHARACTERISTICS (Continued)
XC9223B081xx (Continued) PARAMETER Detect Voltage VOLTAGE DETECTOR Release Voltage Hysteresis Voltage Output Current Delay Time VDIN "H" Current VDIN "L" Current VDOUT "H" Current VDOUT "L" Current SYMBOL VDF VDR VHYS IDOUT TDLY IVDINH IVDINL IVDOUTH IVDOUTL CONDITIONS Voltage which VDOUT becomes "H" "L" Voltage which VDOUT becomes "L" "H" VHYS=(VDR-VDF)/VDF x 100 VDIN=VDF x 0.9, apply 0.5V to VDOUT Time until VDOUT becomes "L" VIN=CE=VDIN=6.0V VIN=CE=6.0V, VDIN=0V VIN=VDIN=VDOUT=6.0V VIN=VDIN=6.0V, VDOUT=0V "H" MIN. -0.1 -1.0 TYP. 0.700 0.745 6 2.5 2 MAX. 0.1 1.0 UNIT V V % mA ms A A A A Topr=25OC
CIRCUIT
-
Test Condition: Unless otherwise stated, VIN=3.6V. NOTE: *1: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes. If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance. *2: Including hysteresis operating voltage range. *3: EFFI = { ( output voltage x output current ) / ( input voltage x input current) } x 100 *4: On resistance ()= Lx pin measurement voltage / 100mA *5: Time until it short-circuits Lx with GND through 1 of resistance from a state of operation and is set to Lx=Low from current limit pulse generating. *6: Integral latch circuit: Latch time may become longer and latch operation may not work when VIN is 3.0V or more. *7: When temperature is high, a current of approximately 50A (maximum) may leak.
OPERATIONAL EXPLANATION
Each unit of the XC9223/9224 series consists of a reference voltage source, a ramp wave circuit, error amplifier, PWM comparator, phase compensation circuit, output voltage adjustment resistors, P-channel MOS driver transistor, N-channel MOS synchronous rectification switching transistor, current limiter circuit, U.V.L.O. circuit and others. The series compares, using the error amplifier, the internal reference voltage to the CE pin with the voltage fedback from the VOUT pin via resistors RFB1 and RFB2. Phase compensation is performed on the resulting error amplifier output, to input a signal to the PWM comparator to determine the turn-on time during PWM operation. The PWM comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output to the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This process is continuously performed to ensure stable output voltage. The current feedback circuit monitors the P-channel MOS driver transistor current for each switching operation, and modulates the error amplifier output signal to provide multiple feedback signals. This enables a stable feedback loop even when a low ESR capacitor, such as a ceramic capacitor, is used, ensuring stable output voltage. The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter. The ramp wave circuit determines switching frequency. The frequency is fixed internally and can be selected from 1.0MHz and 2.0MHz. generated in this circuit are used to produce ramp waveforms needed for PWM operation, and to synchronize all the internal circuits.
Clock pulses
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback voltage divided by the internal resistors (RFB1 and RFB2). When a voltage lower than the reference voltage is fed back, the output voltage of the error amplifier increases. The gain and frequency characteristics of the error amplifier output are fixed internally to deliver an optimized signal to the mixer.
Data Sheet
6
DC000019
XC9223/9224 Series
1A Driver Transistor Built-In Step-Down DC/DC Converters Preliminary
OPERATIONAL EXPLANATION (Continued)
The current limiter circuit of the XC9223/9224 series monitors the current flowing through the P-channel MOS driver transistor connected to the Lx pin, and features a combination of the constant-current type current limit mode and the operation suspension mode. For the current limit values, please select the values either from 1.5A (MIN.) when the LIM pin is high level or 0.5A (MIN.) when the LIM pin is low level. 1 When the driver current is greater than a specific level, the constant-current type current limit function operates to turn off the pulses from the Lx pin at any given time. 2 When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state. 3 At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an over current state. 4 When the over current state is eliminated, the IC resumes its normal operation. The IC waits for the over current state to end by repeating the steps 1 through 3. If an over current state continues for several msec and the above three steps are repeatedly performed, the IC performs the function of latching the OFF state of the driver transistor, and goes into operation suspension mode. After being put into suspension mode, the IC can resume operation by turning itself off once and then starting it up using the CE pin, or by restoring power to the VIN pin. Integral latch time may be released from a current limit detection state because of the noise. Depending on the state of a substrate, it may result in the case where the latch time may become longer or the operation may not be latched. Please locate an input capacitor as close as possible.
Limit < # mS
Limit > # mS Current Limit LEVEL
IDOUT
0mA
DCOUT
VSS
LX
CE
Restart
VIN
For protection against heat damage of the ICs, thermal shutdown function monitors chip temperature. The XC9223/9224 series build in three protection functions: integral latch protection, thermal shutdown, and short-circuit protection. The thermal shutdown circuit starts operating and the driver transistor O O will be turned off when the chip's temperature reaches 150 C. When the temperature drops to 130 C or less after shutting of the current flow, the IC performs the soft start function to initiate output startup operation. The short-circuit protection circuit monitors FB voltage. In case where output is accidentally shorted to the Ground and when the FB voltage decreases less than half of the FB voltage, the short-circuit protection operates to turn off the driver transistor. In suspension mode, the operation can be resumed by either turning the IC off and on via the CE/MODE pin, or by restoring power supply to the VIN pin. The detector block of the XC9223/9224 series detects a signal inputted from the VDIN pin by the VDOUT pin. When the VIN pin voltage becomes 1.4V or lower, the P-channel output driver transistor is forced OFF to prevent false pulse output caused by unstable operation of the internal circuitry. When the VIN pin voltage becomes 1.8V or higher, switching operation takes place. By releasing the U.V.L.O. function, the IC performs the soft-start function to initiate output startup operation. The soft-start function operates even when the VIN pin voltage falls momentarily below the U.V.L.O. operating voltage. A MODE/SYNC pin has two functions, a MODE switch and an input of external clock signal. The MODE/SYNC pin operates as the PWM mode when applying high level of direct current and the PFM/PWM automatic switching mode by applying low level of direct current, which is the same function as the normal MODE pin. internal clock signal. By applying the external clock signal (25% of the internal clock signal, ON Duty 25% to 75%), the MODE/SYNC pin switches to the Also the circuit will synchronize with the falling edge of external clock signal. While synchronizing with the external clock signal, the If the MODE/SYNC pin holds high or low level of the external clock signal for several S, the
MODE/SYNC pin becomes the PWM mode automatically.
MODE/SYNC pin stops synchronizing with the external clock and switches to the internal clock operation.
Data Sheet
7
DC000019

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