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

Rev.2.0 Oct. 08, 2019

AX3051/A



BLOCK DIAGRAM

-

+

-

+

-

+

-

S

R

Q

Q

+

FB



1V

1.5V

INTERNAL

REGULATORS

IN

5V

IN

5V

BS

LX

GND

M1

0.15Ω

M2

5Ω

RAMP

CLK

CURRENT

SENSE

AMPLIFIER

CURRENT

COMPARATOR

SHUTDOWN

COMPARATOR

ERROR

AMPLIFIER

OSCILLATOR

100KHz/250KHz

7V

Zener

COMP

+

-

CURRENT

Limit

AMPLIFIER

SENSE1

SENSE2

OVP



PIN ASSIGNMENT

The package of AX3051/A is SOP-8L-EP; the pin assignment is given by:

( Top View )

1

3

4

8

7

6

5

BS

LX

SOP-8L-EP

SENSE1

GND

VIN

GND

FB

COMP

SENSE2

2

Name

Description

BS

Bootstrap Pin. This provides

power to the internal

high-side MOSFET gate

driver.

Connect a 0.1uF capacitor

from BS pin to LX pin.

LX

Power Switching Output to

External Inductor.

SENSE1

Current Sense input1

SENSE2

Current Sense input2

FB

Output voltage feedback

control

COMP

Error Amplifier Output. This

pin is used to compensate

the converter.

VIN

Power Supply Input. Bypass

this pin with a 0.1uF ceramic

capacitor to GND, placed as

close to the IC as possible.

GND

GND pin