APW7047KC-TR 데이터 시트보기 (PDF) - Anpec Electronics

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APW7047KC-TR

Dual Advanced PWM and Source-Sink Linear Controller

Anpec Electronics 

APW7047

Dual Advanced PWM and Source-Sink Linear Controller

Features

General Description

• 3 Regulated Voltages are provided

− SYNC. Buck Converter for VCORE

(1.15V~1.50V)

− Standard Buck Converter for VMEM

(2.40V~2.75V)

−Linear Controller with SOURCE-SINK

Regulation for VTT(1.25V)

• Simple Single-Loop Control Design

− Voltage-Mode PWM Control

• Excellent Output Voltage Regulation

− VCORE Output : ±2% Over Temperature

− VMEM Output : ±2% Over Temperature

− VTT Output : 1/2 VIN ±25mV Over

Temperature Min. VIN = 1.7V

• Fast Transient Response

− Built-in Feedback Compensation

− Full 0% to 100% Duty Ratio

• Over-Voltage and Over-Current Fault Monitor

• Constant Frequency Operation(200kHz)

• 24 pins, SOIC Package

Applications

• M/B DDR Power Regulation

• AGP/PCI Graphics Power Regulation

• SSTL-2 Termination

The APW7047 provides the power controls and protec-

tions for three output voltages on AGP/PCI Graphic Card

applications. It integrates two PWM controllers , one

SOURCE-SINK linear controller, as well as the monitor

and protection functions into a single package. One PWM

converter (PWM1) regulates the VCORE(1.5V) for the GPU

with a SYNC. buck converter. The other standard buck

converter (PWM2) regulates the VMEM(2.5V) for the pow-

er of DDR memory. The SOURCE-SINK linear controller

control two external MOSFETs to be a linear regulator

with the capability of sourcing and sinking current. It reg-

ulates the VTT (1.25V) power for DDR Termination voltage.

Additional built-in over-voltage protection (OVP) will be

started when the VCORE or VMEM output is above 115%

of each DAC setting (VCORE and VMEM). OVP function will

shutdown the all output voltages until re-powering on the

IC. For each PWM converter, the over-current function

monitors the output current by sensing the voltage drop

across the MOSFET‘s r

, eliminating the need for a

DS(ON)

current sensing resistor.

Pin Description

VCC 1

UGATE 1 2

PHASE1 3

SS 4

SD 5

SO URCE 6

SINK 7

FB 8

VIN 9

OCSET1 10

VSE N1 11

GND 12

24 BUGOAOTTE 2

23 UPHGAASTEE22

22 PLHGATSEE12

21 PG ND

20 MEM2

19 MEM1

18 MEM0

17 CORE2

16 CORE1

15 CORE0

14 OCSET2

13 VSE N2

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise

customers to obtain the latest version of relevant information to verify before placing orders.

Copyright  ANPEC Electronics Corp.

1

Rev.A.1 - May., 2002

www.anpec.com.tw

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