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

Rev.1.3 Oct.31, 2019

AX3531



ELECTRICAL CHARACTERISTICS (COUNTINOUS)

(VIN = VEN=3.6V, TA =25°C, unless otherwise specified)

Characteristics

Symbol

Conditions

Min

Typ

Max Units

R

DS(ON) of N-CH MOSFET

RDSON

VIN = 5V (Note 1)

-

100

-

mΩ

EN pin logic input threshold

voltage

VENL

-

-

0.4

V

VENH

1.2

-

-

EN Pin Input Current

IEN

-

±0.1

±1

uA

Efficiency

EFFI

VIN=5V, VOUT=3.3V,

IOUT=0.5A

-

94

-

%

Thermal shutdown

TDS

-

150

-

°C

Thermal

shutdown Hysteresis

TSH

-

30

-

°C

Note 1: Guaranteed by design.



APPLICATION CIRCUIT

VOUT = 0.6 * (1+R1/R2)

R2

100K

C1

10uF× 2

C2

10uF× 2

VOUT=1.8V

L1

2.2 uH

R1

200K

AX3531

VIN

EN

GND

SW

FB

C3

27pF

VIN=2.8V~5.5V

R2=10K~150K



FUNCTION DESCRIPTIONS

Operation

AX3531 is a monolithic switching mode step-down DC-DC converter. It utilizes internal

MOSFETs to achieve high efficiency and can generate very low output voltage by using

internal reference at 0.6V. It operates at a fixed switching frequency, and uses the slope

compensated current mode architecture. This step-down DC-DC Converter supplies

minimum 2000mA output current at input voltage range from 2.8V to 5.5V.