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APW3007-12

Advanced Dual PWM and Dual Linear Power Controller

Anpec Electronics 

APW3007

Functional Pin Description (Cont.)

GND (Pin 17)

VSEN1 (Pin 22).

Signal ground for the IC. All voltage levels are

measured with respect to this pin.

GATE3 (Pin 18)

This pin is connected to the PWM converter’s output

voltage . The PGOOD and OVP comparator circuits

use this signal to report output voltage status and for

over-voltage protection .

Connect this pin to the gate of an external MOSFET.

This pin provides the drive for the 1.5V regulator’s

pass transistor.

FB3 (Pin 19)

PGND (Pin 24)

This is the power ground connection . Tie the syn-

chronous PWM converter’s lower MOSFET source

to this pin .

Connect this pin to the output of the 1.5V linear

regulator. This pin is monitored for under-voltage

events.

FB1 (Pin21)

LGATE (Pin 25)

Connect LGATE to the PWM converter’s lower

MOSFET gate . This pin provides the gate drive for

the lower MOSFET .

This pin provides the feedback for the synchronous

switching regulator . Typically this pin can be con-

nected directly to the output of the switching regula-

tor . However , a resistor driver is recommended to

be connected from this pin to vout1 and GND to ad-

just the output voltage for any drop in the output volt-

age that is caused by the trace resistance . The value

of the resistor connected from Vou1 to FB1 must be

less than 100Ω .

UGATE (Pin 27)

Connect UGATE pin to the PWM converter’s upper

MOSFET gate . This pin provides the gate drive for

the upper MOSFET .

V12 (Pin28)

Provide a 12V bias supply for the IC to this pin . This

pin also provides the gate bias charge for all the

MOSFETs controlled by the IC . The voltage at this

pin is monitored for Power-On Reset purposes .

Simplified Power System Diagram

5V

C IN

3.3V

C IN

NVVDD

L1

C OUT

3.3V

FBVDDQ

C IN

C OUT

PW M2

C o n tro lle r

PW M1

C o n tro lle r

Linear

C o n tro lle r

Linear

R e gu la to r

L2

VTT

C OUT

V OUT4

Copyright  ANPEC Electronics Corp.

7

Rev. A.5 - Jun., 2003

www.anpec.com.tw

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