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

Rev.2.0 Oct.08, 2019

AX3101



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

0.784 0.800 0.816 V

Quiescent Current

ICCQ

VFB=1.2V force driver

off

-

3

5

mA

Feedback Bias Current

IFB

IOUT=0.1A

-

0.1 0.5

uA

Shutdown Supply Current

ISD

VEN =0V

-

2

10

uA

OCSET pin bias current

IOCSET

110 130 150 uA

Switch Current

ISW

3.0

-

-

A

Line Regulation

△ VOUT/VOUT VCC=8V~20V,

IOUT=0.2A

-

1

2

%

Load Regulation

△ VOUT/VOUT IOUT = 0.1 to 2A

-

0.2 0.5

%

Oscillation Frequency

FOSC

SW pin

260 330 400 KHz

EN Pin Logic input threshold

voltage

VSH

High (regulator ON)

2.0

-

-

V

VSL

Low (regulator OFF)

-

-

0.8

EN Pin Input Current

ISH

VEN=2.5V (ON)

-

20

-

uA

ISL

VEN=0.3V (OFF)

-

-10

-

uA

Soft-Start Time

TSS

0.3

4

8

ms

Internal MOSFET RDSON

RDSON

VCC=5V, VFB=0V

-

100 140

mΩ

VCC=12V, VFB=0V

-

70 100

Efficiency

EFFI

VCC = 12V,

VOUT = 5V

IOUT = 1A

-

92

-

%

IOUT = 2A

92



APPLICATION CIRCUIT

C2

470uF

C4

470uF

1

2

L1

33uH

R1

6.8K

R2

1.3K

VIN+12V

ON/OFF

C1

1nF

VOUT = 5V/2A

R3

1.3K

R4

100K

D1

B340

C8

0.1uF

FB

1

EN

2

OCSET

3

VCC

4

SW

5

SW

6

VSS

7

VSS

8

AX3101

R1

R2

VFB = 0.8V ; R2 suggest 0.8K ~ 6k

VOUT = VFB x (1 +

)

C3

0.1uF

Option

L1 recommend value (VIN=12V ,IOUT=2A,)

VOUT

1.8 V

2.5V

3.3V

5V

L1 Value

18uH

22uH

27uH

33uH