AP1538

18V 3A 300KHz BUCK CONVERTER

AP1538 Rev. 5

5 of 13

OCTOBER 2009

DS31451

www.diodes.com

Electrical Characteristics

Symbol

Parameter

Conditions

Min

Typ.

Max

Unit

Feedback Voltage

0.784

0.8

0.816

V

Feedback Bias Current

-

0.1

0.5

µA

Current Consumption During

Power Off

-

10

-

µA

∆V

OUT

Line Regulation

-

1

2

%

∆V

OUT

Load Regulation

-

0.2

0.5

%

Oscillation Frequency

Measure waveform at SW pin

240

300

400

KHz

Frequency of Current Limit or

Short Circuit Protection

Measure waveform at SW pin

-

50

-

KHz

EN Pin Input Voltage

Evaluate oscillation at SW pin

2.0

-

-

V

Evaluate oscillation stop at SW pin

-

-

0.8

EN Pin Input Leakage Current

EN Pin High

-

20

-

µA

EN Pin Low

-

-10

-

µA

OCSET Pin Bias Current

--

75

90

105

µA

-

110

-

m

Ω

-

70

-

EFFI

Efficiency

-

92

-

%

Thermal shutdown threshold

-

150

-

°C

Thermal shutdown hysteresis

-

55

-

°C

θ

JC

Thermal Resistance

Junction-to-Case

SOP-8L (Note 5)

-

24

-

SOP-8L-DEP (Note 5)

-

26

-

Notes:

5. Test condition for SOP-8L and SOP-8L-DEP: Devices mounted on 2oz copper, minimum recommended pad layout on top & bottom layer with

thermal vias, double sided FR-4 PCB.