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

Rev.1.5 Oct.16, 2019

AX3121



ABSOLUTE MAXIMUM RATINGS (at TA=25°C)

Characteristics

Symbol

Rating

Unit

SVCC,PVCC Pin Voltage

VCC

VSS - 0.3 to VSS + 24

V

Feedback Pin Voltage

VFB

VSS - 0.3 to VCC

V

EN/SS Pin Voltage

VEN/SS

VSS - 0.3 to 5

V

COMP Pin Voltage

VCOMP

VSS - 0.3 to 5

V

Switch Pin Voltage

VSW

VSS - 0.3 to VCC + 0.3

V

Power Dissipation

PD

Internally limited

mW

Storage Temperature Range

TST

-40 to +165

°C

Junction Temperature Range

TJ

-40 to +150

°C

Operating Supply Voltage

VOP

4.5 to 23

V

Thermal Resistance from Junction to case

θJC

SOP-8L-EP=15,

°C/W

Thermal Resistance from Junction to ambient

θJA

SOP-8L-EP=40,

°C/W

Note: θJA is measured with the PCB copper area(need connect to Exposed pad) of approximately 1 in2(Multi-layer).



ELECTRICAL CHARACTERISTICS

(VIN = 12V, VOUT=3.3V, TA=25°C, unless otherwise specified)

Characteristics

Symbol

Conditions

Min Typ Max Units

Feedback Voltage

VFB

IOUT=0.1A

0.605 0.620 0.635 V

Feedback Bias Current

IFB

IOUT=0.1A

-

0.1

0.5

uA

Quiescent Current

ICCQ

VFB=1.2V force driver

off

-

6

8

mA

Shutdown Supply Current

ISD

VEN =0V

-

45

80

uA

Switch Current Limit

ISW-Lim

4.0

-

-

A

Line Regulation

△ VOUT/VOUT

VIN = 4.5V~23V,

IOUT=0.2A

-

0.02 0.1

%

Load Regulation

△ VOUT/VOUT IOUT = 0.1A to 3.5A

-

0.3 0.7

%

Oscillation Frequency

FOSC

SW pin

200 250 300 KHz

Short Oscillation Frequency

FOSC1

VFB<0.4V

-

40

-

KHz

Dead Time

TDR

Rising

-

50

-

nS

TDF

Falling

-

50

-

EN/SS shutdown threshold

voltage

VENL

regulator OFF

-

-

0.4

V

EN/SS current

IEN/SS

VEN/SS=0V

-

6

12

uA

Internal PMOS RDSON

RDS(ON)-P

VIN=5V, VFB=0V

-

90 150

mΩ

VIN=12V, VFB=0V

-

50 120