Copyright

© ANPEC Electronics Corp.

Rev. A.3 - Mar., 2008

APW7067N

www.anpec.com.tw

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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.

Synchronous Buck PWM and Linear Controller

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Provided Two Regulated Voltages

- Synchronous Buck Converter

- Linear Regulator

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Single 12V Power Supply Required

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Excellent Both Output Voltage Regulation

- 0.8V Internal Reference

- ±1% Over Line Voltage and Temperature

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Integrated Soft-Start for PWM and Linear Outputs

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Programmable Frequency Range from 150kHz

to 1000kHz

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Voltage Mode PWM Control Design and Up to 89%

(Typ.) Duty Cycle

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Under-Voltage Protection for PWM and Linear

Output

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Over-Current Protection for PWM Output

- Sense Low-Side MOSFET’s R

DS(ON)

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SOP-14, QSOP-16 and QFN4x4-16 packages

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Lead Free and Green Devices Available

(RoHS Compliant)

The APW7067N integrates synchronous buck PWM and

linear controller, as well as monitoring and protection

functions into a single package. The synchronous PWM

controller drives dual N-channel MOSFETs, which provides

one controlled power output with under-voltage and over-

current protections. Linear controller drives an external

N-channel MOSFET with under-voltage protection.

The APW7067N provides excellent regulation for output

load variation. An internal 0.8V temperature-compensated

reference voltage is designed to meet the requirement

of low output voltage applications. The switching frequency

is adjustable from 150kHz to 1000kHz.

The APW7067N with excellent protection functions: POR,

OCP and UVP. The Power-On-Reset (POR) circuit can

monitor VCC12 supply voltage exceeds its threshold

voltage while the controller is running, and a built-in

digital soft-start provides both outputs with controlled

rising voltage. The Over-Current Protection (OCP)

monitors the output current by using the voltage drop

across the lower MOSFET’s R

internal V

sensing resister. When the output current reaches the

trip point, the controller will shutdown the IC directly, and

latch the converter’s output. The Under-Voltage Protection

(UVP) monitors the voltages of FB and FBL pins for short-

circuit protection. When the V

of V

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Graphic Cards

Features

General Description

Applications

Typical Application Circuit

V

OUT1

V

IN1

L

Q1

PWM

Controller

Q2

Linear

Controller

V

OUT2

Q3

V

IN2

12V

R

FS_DIS