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Rev.1.9 Aug.05, 2010

AX3101



ABSOLUTE MAXIMUM RATINGS (at TA=25°C)

Characteristics

Symbol

Rating

Unit

VCC Pin Voltage

VCC

VSS - 0.3 to VSS + 22

V

Feedback Pin Voltage

VFB

VSS - 0.3 to VCC

V

ON/OFF Pin Voltage

VEN

VSS - 0.3 to VCC + 0.3

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 +150

°C

Operating Junction Temperature Range

TJ

-20 to +125

°C

Operating Supply Voltage

VOP

+3.6 to +20

V

Output Current

IOUT

0 to 2

A

Thermal Resistance from Junction to case

θJC

25

°C/W

Thermal Resistance from Junction to ambient

θJA

70

°C/W

Note: θJA is measured with the PCB copper area(need connect to SW pins) 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

0.784 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

IOUT = 1A

EFFI

VCC = 12V,

VOUT = 5V

-

92

-

%

IOUT = 2A

-

92

-