AP8800

350mA LED Step-Down Converter

AP8800 Rev. 1

4 of 11

MARCH 2009

www.diodes.com

Symbol

Parameter

Conditions

Min

Typ.

Max

Unit

Operating Input Voltage

8.0

-

28

V

Continuous switch Current

(Note 3)

-

-

350

mA

Quiescient Current

-

20

30

μA

Switching Frequency

-

0.25

-

MHz

Internal Threshold Voltage

92

100

108

mV

Internal Reference Voltage

-

1.25

-

V

SET

SET pin input current

-

1.3

-

μA

Rds(on)

On Resistance of MOSFET

1.7

2.2

Ω

-

-

5

μA

EN

Voltage High

ON

1.25

-

-

V

EN

Voltage Low

OFF

-

-

0.2

V

θ

JA

Thermal Resistance

Junction-to-Ambient

SOP-8L (Note 4)

-

92

-

°C/W

MSOP-8L (Note 4)

-

120

-

°C/W

DFN3030-10 (Note 4)

-

46

-

°C/W

θ

JC

Thermal Resistance

Junction-to-Case

SOP-8L (Note 4)

-

60

-

°C/W

MSOP-8L (Note 4)

-

98

-

°C/W

DFN3030-10 (Note 4)

-

32

-

°C/W

Notes:

3. Refer to figure 4 for the device derating curve.

4. Test condition for SOP-8L, MSOP-8L and DFN3030-10: Device mounted on FR-4 PCB, 2”x2”, 2oz copper, minimum recommended

pad layout on top layer and thermal vias to bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is

needed.

Typical Application Circuit

Electrical Characteristics