AP3211 datasheet(5/12 Pages) BCDSEMI

5 / 12 page

Data Sheet

1.4MHz, 1.5A ASYNCHRONOUS DC-DC BUCK CONVERTER

AP3211

Jul. 2011

Rev. 1.3

BCD Semiconductor Manufacturing Limited

Electrical Characteristics

VIN=VEN=12V, VOUT=3.3V, TA=25ºC, unless otherwise specified.

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Input Voltage

VIN

4.5

Quiescent Current

VFB=0.9V

0.8

1.1

Shutdown Supply Current

ISHDN

VEN=0V

0.1

1.0

μA

Feedback Voltage

VFB

0.785

0.810

0.835

Feedback Over Voltage Threshold

VFBOV

0.972

Feedback Bias Current

IFB

VFB=0.85V

-0.1

0.1

μA

Switch On-resistance

RDSON

ISW=1A

0.35

Switch Leakage Current

ILEAK

VIN=18V,

VEN=0V

0.1

μA

Switch Current Limit

ILIM

1.8

2.4

VENH

1.5

EN Pin Threshold

VENL

0.4

Input UVLO Threshold

VUVLO

VIN Rising

3.3

3.8

4.3

Input UVLO Hysteresis

VHYS

0.2

fOSC1

1.1

1.4

1.7

MHz

Oscillator Frequency

fOSC2

Short Circuit

460

kHz

Max. Duty Cycle

DMAX

VFB=0.6V

Min. Duty Cycle

DMIN

VFB=0.9V

Minimum On Time

tON

100

Thermal Shutdown

TOTSD

160

ºC

Thermal Shutdown Hysteresis

THYS

ºC

Soft-start Time

tSS

200

μs

Note 2: RDSON , tON, TOTSD, THYS and tSS are guaranteed by design.

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