AP1533

PWM CONTROL 1.8A STEP-DOWN CONVERTER

AP1533 Rev. 4

4 of 9

JULY 2009

DS31192

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

Line Regulation

-

1

2

%

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

--

75

90

105

µA

-

110

150

mΩ

-

80

110

EFFI

Efficiency

-

91

-

%

-

150

-

°C

Thermal shutdown hysteresis

-

55

-

°C

Thermal Resistance

Junction-to-Ambient

SOP-8L (Note 3)

-

134

-

Thermal Resistance

Junction-to-Case

SOP-8L (Note 3)

-

22

-

Notes:

3. Test condition: Device mounted on FR-4 PCB, 2”x2”, 2oz copper, minimum recommended pad layout, single side.

For better thermal performance, larger copper pad for heatsink is needed.