AIC1340 High Performance, Tripple-Ouput, AutoTracking Combo Controller n FEATURES n GENERAL DESCRIPTION l Provide Triple Accurate Regulated Voltages The AIC1340 combines a synchronous voltage mode l Optimized Voltage-Mode PWM Control PWM controller with a low dropout linear regulator l Dual N-Channel MOSFET Synchronous Drivers and a linear controller as well as the monitoring and l Fast Transient Response protection functions in this chip. The PWM control- l Adjustable Over Current Protection using RDS(on) . No External Current Sense Resistor Required. ler 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 l Programmable Softstart Function l 200KHz Free-Running Oscillator l Robust Outputs Auto-Tracking Characteristics ler features over current protection using RDS(on) . It l Sink and Source Capabilities with External Circuit improves efficiency and saves cost, as there is no step-down converter. It is able to power CPUs, GPUs, memories, and chipsets. The PWM control- expensive current sense resistor required. n APPLICATIONS l Advanced PC Mboards l Information PCs ternal MOSFET to form a linear regulator that regu- l Servers and Workstations lates power for system I/O. The built-in adjustable l Internet Appliances low dropout linear regulator can supply current up to l PC Add-On Cards 500mA for supplying another system I/O. Output l DDR Termination. voltage of both linear regulators can also be adjust- The built-in adjustable linear controller drives an ex- ed 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 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510 1 AIC1340 n TYPICAL APPLICATION CIRCUIT +12VIN +5VIN VCC 4 14 OCSET + GND SS 5 2 UGATE 1 PHASE VOUT1 +3.3VIN VIN2 7 16 GATE3 VOUT3 10 FB3 15 11 1.5V + LGATE PGND + VOUT2 FB1 VOUT2 8 13 2.5V + FB2 6 12 14 COMP1 3 SD GND Typical Triple-Output Application n ORDERING INFORMATION ORDER NUMBER AIC1340-XX PACKAGING TYPE S: SMALL OUTLINE TEMPERATURE RANGE C: 0° C~+70 ° C AIC1340CS (SO16) PIN CONFIGURATION PHASE 1 16 LGATE UGATE 2 15 PGND SD 3 VCC 4 14 OCSET 13 FB1 SS 5 12 COMP1 FB2 6 11 FB3 VIN2 7 VOUT2 8 10 GATE3 9 GND 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 85°C Maximum Operating Junction Temperature .................................................................... 100°C Supply Voltage, VCC..............................................................................................15V±10% Thermal Information Thermal Resistance θJA (°C/W) SOIC Package ..............................................................................................100°C/W Maximum Junction Temperature (Plastic Package)......................................................... 150°C Maximum Storage Temperature Range............................................................. -65°C to 150°C Maximum Lead Temperature (Soldering 10s).................................................................. 300°C n TEST CIRCUIT Refer to APPLICATION CIRCUIT. 3 AIC1340 n ELECTRICAL CHARACTERISTICS (Vcc=12V, T J=25°C, Unless otherwise specified) PARAMETER TEST CONDITIONS SYMBOL UGATE, LGATE, GATE3 and VOUT2 open ICC MIN. TYP. MAX. UNIT 1.8 3 mA VCC SUPPLY CURRENT Supply Current POWER ON RESET Rising VCC Threshold VOCSET=4.5V VCCTHR 8.6 9.5 10.4 V Falling VCC Threshold VOCSET=4.5V VCCTHF 8.2 9.2 10.2 V Rising VIN2 Under-Voltage Threshold VIN2THR 2.5 2.6 2.7 V VIN2 Under-Voltage Hysteresis VIN2HYS 130 mV Rising VOCSET1 Threshold VOCSETH 1.3 V OSCILLATOR Free Running Frequency F 170 ∆VOSC Ramp. Amplitude 200 230 1.3 KHz VP-P REFERENCE FB2 Reference Voltage VREF2 1.240 1.265 1.290 V FB3 Reference Voltage VREF3 1.250 1.275 1.300 V +1 % 82 % LINEAR REGULATOR Regulation 10mA<IOUT2<150mA Under-Voltage Level FB2 falling -1 FB2UV Over-Current Protection 70 430 Over-Current Protection During Start-up 570 mA 750 mA LINEAR CONTROLLER Regulation 0 < IGATE3 < 10mA Under-Voltage Level FB3 falling -2.5 FB3UV 70 +2.5 % 80 % 4 AIC1340 n ELECTRICAL CHARACTERISTICS PARAMETER TEST CONDITIONS (Continued) SYMBOL MIN. TYP. MAX. UNIT PWM CONTROLLER ERROR AMPLIFIER DC GAIN Gain Bandwidth Product Slew Rate COMP1=10pF 76 dB GBWP 11 MHz SR 6 V/µS PWM CONTROLLER GATE DRIVER Upper Drive Source VCC=12V, VUGATE=11V RUGH 5.2 6.5 Ω Upper Drive Sink VCC=12V, VUGATE =1V RUGL 3.3 5 Ω Lower Drive Source VCC=12V, VLGATE=11V RLGH 4.1 6 Ω Lower Drive Sink VCC=12V, VLGATE=1V RLGL 3 5 Ω VOCSET=4.5V DC IOCSET 200 230 µA PROTECTION OCSET Current Source Soft-Start Current 170 ISS µA 11 Chip Shutdown Soft Start Threshold 1.0 V n PIN DESCRIPTIONS Pin 1: provides the gate bias charge for PHASE: Over-current detection pin. Con- all the MOSFETs controlled by nect the PHASE pin to source of the external high-side the IC. Recommended supply N- voltage is 12V. MOSFET. This pin detects the voltage drop across the high-side Pin 2: Pin 5: SS: Soft-start pin. Connect a capaci- N-MOSFET RDS(ON) for over- tor from this pin to ground. This current protection. capacitor, along with an internal UGATE: External high-side 10µA (typically) current source, N-MOSFET sets the soft-start interval of the gate drive pin. Connect UGATE converter. to gate of the external high-side Pulling this pin low will shut down N-MOSFET. the IC. Pin 3: SD: To shut down the system, active high or floating. Pin 6: FB2: Connect this pin to a resistor divider to set the linear regulator Pin 4: VCC: The chip power supply pin. It also output voltage. 5 AIC1340 Pin 7: VIN2: This pin supplies power to the in- pin is connected to error amplifier ternal regulator. Connect this pin output and PWM comparator. An to a suitable 3.3V source. RC network is connected to FB1 in to compensate the voltage Additionally, this pin is used to control feedback loop of the con- monitor the 3.3V supply. If, fol- verter. lowing a start-up cycle, the voltage drops below 2.6V (typically), pin. the FB1 pin and COMP1 pin start cycle is initiated upon return are used to compensate the volt- of the 3.3V supply above the un- age-control feedback loop. Pin 14: OCSET: Current limit sense pin. Connect VOUT2: Output of the linear regulator. a resistor ROCSET from this pin to Supplies current up to 500mA. Pin 9: GND: The error amplifier inverting input the chip shuts down. A new soft- der-voltage threshold. Pin 8: Pin 13: FB1 the drain of the external high-side N-MOSFET. ROCSET, an internal Signal GND for IC. All voltage 200µA current source (IOCSET), levels are measured with respect and the upper N-MOSFET on- to this pin. resistance (RDS(ON)) set the overPin 10: GATE3: Linear Controller output drive pin. current trip point according to the This pin can drive either a Dar- following equation: lington NPN transistor or a N- I PEAK = channel MOSFET. Pin 11: FB3 I OCSET × ROCSET RDS(ON) Negative feedback pin for the linear controller error amplifier connect this pin to a resistor divider 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. 6 AIC1340 n PACKAGE DIMENSIONS 16 LEAD PLASTIC SO (300 mil) (unit: mm) D E H SYMBOL MIN MAX A 2.35 2.65 A1 0.10 0.30 B 0.33 0.51 C 0.23 0.32 D 10.10 10.50 E 7.40 7.60 e e 1.27(TYP) A A1 l B c L H 10.00 10.65 L 0.40 1.27 7