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Axelite Confidential Materials, do not copy or distribute without written consent.

Rev.1.1 Oct.16, 2019

AX3133



BLOCK DIAGRAM

Oscillator

START - UP

+

Thermal

Shutdown

Vss

SW

FB

COMP.

V CC

Current

limit

+

_

AMP

COMP.

CURRENT

SOURCE

BIAS

1.23V

REFERENCE

2.5 V

REGULATOR

COMP

0.815 V

EN / SS

-

PWM

Switched

Control Circuit

VGATE

OSC

5uA



PIN ASSIGNMENT

The package of AX3133 is SOP-8L-EP; the pin assignment is given by:

( Top View )

1

2

3

4

8

7

6

5

FB

VGATE

SOP8L-EP

VCC

EN/SS

OSC

VSS

SW

COMP

SW

Name

Description

EN/SS

ON/OFF Shutdown and Soft-start

pin

VSS

GND pin

VGATE

Driver GATE clamping pin. The

pin must connect a 1uF capacitor

to VCC

VCC

IC power supply pin

SW

Switch pin. Connect external

inductor & diode here.

FB

Feedback pin

COMP Compensation pin

OSC

Frequency Set Pin. The pin

connect a resistance to GND.