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APW7088

Two-Phase Buck PWM Controller with Integrated MOSFET Drivers

Anpec Electronics 

APW7088

Two-Phase Buck PWM Controller with Integrated MOSFET Drivers

Features

General Description

• Voltage-Mode Operation with Current Sharing

- Adjustable Feedback Compensation

- Fast Load Transient Response

• Operate with 8V~13.2VCC Supply Voltage

• Programmable 3-Bit DAC Reference

-±1.5% System Accuracy Over Temperature

• Support Single- and Two-Phase Operations

• 5V Linear Regulator Output on 5VCC

• 8~12V Gate Drivers with Internal Bootstrap Diode

• Lossless Inductor DCR Current Sensing

• Fixed 300kHz Operating Frequency Per Phase

• Power-OK Indicator Output

- Regulated 1.5V on POK

• Adjustable Over-Current Protection (OCP)

• Accurate Load Line (DROOP) Programming

• Adjustable Soft-Start

• Over-Voltage Protection (OVP)

• Under-Voltage Protection (UVP)

• Over-Temperature Protection (OTP)

• QFN4x4 24-Lead Package (QFN4x4-24)

• Lead Free and Green Devices Available

(RoHS Compliant)

Simplified Application Circuit

VID0

VID1

VID2

VIN1

APW7088

POK

COMP

FB

VIN2

VOUT

The APW7088, two-phase PWM control IC, provides a

precision voltage regulation system for advanced graphic

microprocessors in graphics card applications. The inte-

gration of power MOSFET drivers into the controller IC

reduces the number of external parts for a cost and space

saving power management solution.

The APW7088 uses a voltage-mode PWM architecture,

operating with fixed-frequency, to provides excellent load

transient response. The device uses the voltage across

the DCRs of the inductors for current sensing. Load line

voltage positioning (DROOP), channel-current balance

and over-current protection are accomplished through

continuous inductor DCR current sensing.

The MODE pin programs single- or two- phase operation.

When IC operates in two-phase mode normally, it can

transfer two-phase mode to single phase mode at liberty.

Nevertheless, once operates in single-phase mode, the

operation mode is latched. It is required to toggle SS or

5VCC pin to reset the IC. Such feature of the MODE pin

makes the APW7088 ideally suitable for dual power input

applications, such as PCIE interfaced graphic cards.

This control IC‘s protection features include a set of so-

phisticated over temperature, over-voltage, under-voltage,

and over-current protections. Over-voltage results in the

converter turning the lower MOSFETs on to clamp the

rising output voltage and protects the microprocessor.

The over-current protection level is set through external

resistors. The device also provides a power-on-reset func-

tion and a programmable soft-start to prevent wrong op-

eration and limit the input surge current during power-on

or start-up.

The APW7088 is available in a QFN4x4-24 package.

Applications

• Graphics Card GPU Core Power Supply

• Motherboard Chipset or DDR SDRAM Core Power

Supply

• On-Board High Power PWM Converter with Out-

put Current up to 60A

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.4 - Feb., 2009

www.anpec.com.tw

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