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| AIC1340 High Performance, Tripple-Ouput, AutoTracking Combo Controller n FEATURES l l l l l n GENERAL DESCRIPTION The AIC1340 combines a synchronous voltage mode PWM controller with a low dropout linear regulator and a linear controller as well as the monitoring and protection functions in this chip. The PWM controller regulates the output voltage with a synchronous rectified step-down converter. The built-in N-Channel MOSFET drivers also help to simplify the design of step-down converter. It is able to power CPUs, GPUs, memories, and chipsets. The PWM controller features over current protection using RDS(on) . It improves efficiency and saves cost, as there is no expensive current sense resistor required. Provide Triple Accurate Regulated Voltages Optimized Voltage-Mode PWM Control Dual N-Channel MOSFET Synchronous Drivers Fast Transient Response Adjustable Over Current Protection using RDS(on) . No External Current Sense Resistor Required. Programmable Softstart Function 200KHz Free-Running Oscillator Robust Outputs Auto-Tracking Characteristics Sink and Source Capabilities with External Circuit l l l l n APPLICATIONS l l l l l l Advanced PC Mboards Information PCs Servers and Workstations Internet Appliances PC Add-On Cards DDR Termination. The built-in adjustable linear controller drives an external MOSFET to form a linear regulator that regulates power for system I/O. The built-in adjustable low dropout linear regulator can supply current up to 500mA for supplying another system I/O. Output voltage of both linear regulators can also be adjusted by means of the external resistor divider. Both linear regulators feature current limit. With higher load current required from the low dropout linear regulator, the AIC1341 is recommended. The Shutdown function is also provided for disable the combo controller. Analog Integrations Corporation www.analog.com.tw DS-1340-00 May 24, 01 TEL: 886-3-5772500 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC FAX: 886-3-5772510 1 AIC1340 n TYPICAL APPLICATION CIRCUIT +12VIN VCC 4 14 OCSET UGATE PHASE +5VIN + GND SS 5 2 1 +3.3VIN VIN2 7 16 GATE3 VOUT3 1.5V FB3 11 10 VOUT1 LGATE + 15 PGND + VOUT2 2.5V FB1 VOUT2 8 13 + FB2 6 12 14 GND 3 SD COMP1 Typical Triple-Output Application n ORDERING INFORMATION AIC1340-XX PACKAGING TYPE S: SMALL OUTLINE TEMPERATURE RANGE C: 0 C~+70 C ORDER NUMBER PIN CONFIGURATION PHASE UGATE 1 2 16 LGATE 15 PGND 14 OCSET 13 FB1 12 COMP1 11 FB3 10 GATE3 9 GND AIC1340CS (SO16) SD 3 VCC 4 SS FB2 5 6 VIN2 7 VOUT2 8 2 AIC1340 n ABSOLUTE MAXIMUM RATING Absolute Maximum Ratings Supply Voltage (VCC)..................................................................................................... 15V UGATE.........................................................................................GND - 0.3V to VCC + 0.3V LGATE .........................................................................................GND - 0.3V to VCC + 0.3V Input Output and I/O Voltage ....................................................................... GND - 0.3V to 7V Operating Conditions Ambient Temperature Range ...............................................................................0 C to 85C Maximum Operating Junction Temperature .................................................................... 100C Supply Voltage, VCC..............................................................................................15V10% Thermal Information Thermal Resistance JA (C/W) SOIC Package ..............................................................................................100C/W Maximum Junction Temperature (Plastic Package)......................................................... 150C Maximum Storage Temperature Range............................................................. -65C to 150C Maximum Lead Temperature (Soldering 10s).................................................................. 300C n TEST CIRCUIT Refer to APPLICATION CIRCUIT. 3 AIC1340 n ELECTRICAL CHARACTERISTICS specified) PARAMETER VCC SUPPLY CURRENT Supply Current TEST CONDITIONS (Vcc=12V, T J=25C, Unless otherwise SYMBOL MIN. TYP. MAX. UNIT UGATE, LGATE, GATE3 and VOUT2 open ICC 1.8 3 mA POWER ON RESET Rising VCC Threshold Falling VCC Threshold Rising VIN2 Under-Voltage Threshold VIN2 Under-Voltage Hysteresis Rising VOCSET1 Threshold OSCILLATOR Free Running Frequency Ramp. Amplitude REFERENCE FB2 Reference Voltage FB3 Reference Voltage LINEAR REGULATOR Regulation Under-Voltage Level Over-Current Protection Over-Current Protection During Start-up LINEAR CONTROLLER Regulation Under-Voltage Level 0 < IGATE3 < 10mA FB3 falling FB3UV -2.5 70 +2.5 80 % % 10mA mV 1.3 V 4 AIC1340 n ELECTRICAL CHARACTERISTICS PARAMETER TEST CONDITIONS PWM CONTROLLER ERROR AMPLIFIER DC GAIN Gain Bandwidth Product Slew Rate COMP1=10pF (Continued) SYMBOL MIN. TYP. MAX. UNIT 76 GBWP SR 11 6 dB MHz V/S PWM CONTROLLER GATE DRIVER Upper Drive Source Upper Drive Sink Lower Drive Source Lower Drive Sink PROTECTION OCSET Current Source Soft-Start Current Chip Shutdown Soft Start Threshold VOCSET=4.5V DC IOCSET ISS 170 200 11 1.0 230 A A V VCC=12V, VUGATE=11V VCC=12V, VUGATE =1V VCC=12V, VLGATE=11V VCC=12V, VLGATE=1V RUGH RUGL RLGH RLGL 5.2 3.3 4.1 3 6.5 5 6 5 n PIN DESCRIPTIONS Pin 1: PHASE: Over-current detection pin. Connect the PHASE pin to source of the external high-side NPin 5: SS: MOSFET. This pin detects the voltage drop across the high-side N-MOSFET RDS(ON) for overcurrent protection. Pin 2: UGATE: External high-side N-MOSFET provides the gate bias charge for all the MOSFETs controlled by the IC. Recommended supply voltage is 12V. Soft-start pin. Connect a capacitor from this pin to ground. This capacitor, along with an internal 10A (typically) current source, sets the soft-start interval of the converter. Pulling this pin low will shut down the IC. Pin 3: SD: To shut down the system, active high or floating. Pin 4: VCC: The chip power supply pin. It also Pin 6: FB2: Connect this pin to a resistor d ivider to set the linear regulator output voltage. gate drive pin. Connect UGATE to gate of the external high-side N-MOSFET. 5 AIC1340 Pin 7: VIN2: This pin supplies power to the internal regulator. Connect this pin to a suitable 3.3V source. Additionally, this pin is used to monitor the 3.3V supply. If, following a start-up cycle, the voltage drops below 2.6V (typically), the chip shuts down. A new softstart cycle is initiated upon return of the 3.3V supply above the u nder-voltage threshold. Pin 8: VOUT2: Output of the linear regulator. Supplies current up to 500mA. Pin 9: GND: Signal GND for IC. All voltage levels are measured with respect to this pin. Pin 10: GATE3: Linear Controller output drive pin. This pin can drive either a Darlington NPN transistor or a Nchannel MOSFET. Pin 11: FB3 Negative feedback pin for the linear controller error amplifier connect this pin to a resistor d ivider to set the linear controller output voltage. Pin 12: COMP1 External compensation pin. This Pin 15: PGND: Driver power GND pin. PGND should be connected to a low impedance ground plane in close to lower N-MOSFET source. Pin 16: LGATE: Lower N-MOSFET gate drive pin. Pin 13: FB1 pin is connected to error amplifier output and PWM comparator. An RC network is connected to FB1 in to compensate the voltage control feedback loop of the converter. The error amplifier inverting input pin. the FB1 pin and COMP1 pin are used to compensate the voltage-control feedback loop. Pin 14: OCSET: Current limit sense pin. Connect a resistor R OCSET from this pin to the drain of the external high-side N-MOSFET. ROCSET, an internal 200A current source (IOCSET), and the upper N-MOSFET onresistance ( DS(ON)) set the overR current trip point according to the following equation: I PEAK = I OCSET x ROCSET RDS(ON) 6 AIC1340 n PACKAGE DIMENSIONS l 16 LEAD PLASTIC SO (300 mil) (unit: mm) D SYMBOL A A1 E H MIN 2.35 0.10 0.33 0.23 10.10 7.40 10.00 0.40 MAX 2.65 0.30 0.51 0.32 10.50 7.60 1.27(TYP) 10.65 1.27 B C D E e e A H A1 B c L L 7 |
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