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AIC1401
PWM Step-Down Switching Controller with Shutdown
n FEATURES
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n DESCRIPTION
The AIC1401 is a high efficiency, PWM stepdown, voltage-mode, switching controller. It is suitable for IA, Notebook, LCD PC and LCD monitor main power applications. The built-in high voltage CMOS driver drives an external N-channel MOSFET for replacing the higher cost P-channel MOSFET in a standard buck topology. The 200KHz switching frequency allows using smaller external components while maintaining high conversion ensures efficiency. the The 11MHz converter bandwidth and 6V/us slew rate of the error amplifier higher bandwidth and the fast transient response. The AIC1401 also features over current
Operation Voltage up to 15V Voltage-Mode Operation Fast Transient Response Built In Accurate 1.3V Voltage Reference Adjustable Over Current Protection using RDS(ON) No External Current Sense Resistor Required Low Shutdown Current 200KHz Free-Running Oscillator Built in Soft Start.
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n APPLICATIONS
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Notebook PC Advanced PC Mboards Information PCs Servers and Workstations PC Add-On Cards
protection. It provides adjustable over current trigger point and short-circuit protections by sensing the output current across the on resistance of the external N-channel MOSFET rather then an expensive external low value sense resistor.
n ORDERING INFORMATION
AIC1401-XX PACKAGE TYPE S: SMALL OUTLINE TEMPERATURE RANGE C: 0C ~+70C ORDER NUMBER
AIC1401CS (SOP8)
PIN CONFIGURATION
TOP VIEW OCSET 1 /SHDN 2 COMP 3 FB 4 8 VCC 7 UG 6 LX 5 GND
Analog Integrations Corporation DS-1401-00 May 24, 01
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510
www.analog.com.tw
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AIC1401
n
TYPICAL APPLICATION CIRCUIT
C2 1000P R1 2.2K R5 10 *C1 1 F *C1 must be very close to VCC PIN + M1 IR3303 R6 5K D1 SRA1620 L2 7H
+
12V L1 1.5H C3 470F VOUT 1.5V/5A C4 330 FX3
5V
OCSET /SHDN COMP FB
VCC UG LX GND
C5 R2 90.9K
33P C6 1000P
AIC1401
R4 13K
R3 2K
DC/DC Converter
n ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC ....... ...... ... ... ............................... ... ... ... ......................................... 15V Input, Output, or I/O Voltage .................. ... ... ... ... ... ....... ... ......... GND - 0.3V to VCC+0.3V ESD Classification ................................ ... ... ... ........ ... ................. ... ......................... Class 2 Recommended Operating Conditions Supply Voltage, VCC....... ......................... ... ... ... .......... ... ... .................................. 12V 10% Ambient Temperature Range .... ................................... ... ... ... .... ... ... .................. 0C~70C Junction Temperature Range ....... ............... ... ... ............ ..... ... ......................... 0C~ 100C Thermal Information Thermal Resistance, JA (Typical, Note 1) SOIC Package .................................. ... ... ... ... ... ... ... ... ..... ... ... ... ... ........... . 100C/W SOIC Package (with 3 in 2 of Copper) ... ... ... ... ... ... ... ... ... ... ... ... ... ... ......... .. 90C/W Maximum Junction Temperature (Plastic Package) ... ... ... .... ... ..... ... ... ................... 150C Maximum Storage Temperature Range ... ... ... ... ..... ... ... ... ......... ... .... ......... -65C~150C Maximum Lead Temperature (Soldering 10 Sec) ... ... ... ... ... ... ... ...... ... ......... ......... 300C Note 1: JA is measured with the component mounted on an evaluation PC board in free air.
n TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
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AIC1401
n ELECTRICAL
specified.) PARAMETER
VCC Supply Current Nominal Supply Power-On Reset VCC Threshold Oscillator Frequency Duty Cycle
CHARACTERISTICS
(VCC= 12V, Ta=25C, unless otherwise SYMBOL MIN. TYP. MAX. UNIT
TEST CONDITIONS
UGATE Open
IVCC
2
mA
VOCSET=4.5V
9.5
V
200 88
KHz %
Internal Reference Voltage Reference Voltage Error Amplifier DC Gain Gain-Bandwidth Product Slew Rate Gate Driver Upper Gate Source Upper Gate Sink Protection OCSET Current Source SS Current Shutdown Shutdown Low Input Shutdown High Input Shutdown Mode Current VIN L VIN H 2 1 0.35 V V A VOCSET =4.5VDC IOCSET ISS 200 10 A A RUGATE RUGATE 7 5 GBW SR 76 11 6 dB MHz V/S 1.27 1.30 1.33 V
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AIC1401
n PIN DESCRIPTIONS
PIN 1: OCSET- Current limit sense pin. Connect a resistor ROCSET from this pin to the drain of the external MOSFET. ROCSET, an internal 200A current source (IOCSET), and the external MOSFET onresistance (RDS(ON)) jointly set the overcurrent trip point according to the following equation: comparator. A RC network is connected to FB pin to compensate the voltage-control feedback loop of the converter. PIN 4: FB - The error amplifier inverting input pin. The FB pin and COMP pin are used to compensate the voltage-control feedback loop. - Ground pin. - Overcurrent detection pin. Connect the LX pin to source of the external N-MOSFET. This pin detects the voltage drop across the MOSFET RDS(ON) for overcurrent protection. - External MOSFET gate drive pin. Connect this pin to gate of the external MOSFET. - The chip power supply pin. Recommended supply voltage is 12V.
PIN 5: GND PIN 6: LX
IPEAK =
IOCSET x ROCSET RDS(ON)
If FB pin voltage is sensed to be below 50% of the internal voltage reference, the overcurrent comparator cycles the soft-start function. PIN 2: /SHDN - Shutdown pin. Connect this pin to ground for shutdown. PIN 3: COMP - External compensation pin. This pin is connected to error amplifier output and PWM
PIN 7: UG
PIN 8: VCC
n
APPLICATION CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT
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AIC1401
1/2 PHYSICAL DIMENSIONS
l 8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL A A1
H E
MIN 1.35 0.10 0.33 0.19 4.80 3.80
MAX 1.75 0.25 0.51 0.25 5.00 4.00
B C D
e A C A1
E e H L
L
1.27(TYP) 5.80 0.40 6.20 1.27
B
5

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