AP8801

500mA LED Step-Down Converter

AP8801 Rev. 1

4 of 11

MARCH 2009

www.diodes.com

Electrical Characteristics

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Operating Input Voltage

8.0

-

48

V

Continuous switch current

(Note 3)

500

mA

Quiescent Current

-

78

120

μA

Switching Frequency

-

-

0.5

MHz

Internal Threshold Voltage

184

200

216

mV

Internal Reference Voltage

-

1.25

-

V

SET

SET pin input current

-

7

-

μA

Rds(on)

On Resistance of MOSFET

0.7

1.15

Ω

-

-

8

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)

-

88

-

°C/W

MSOP-8L (Note 4)

-

128

-

°C/W

θ

JC

Thermal Resistance

Junction-to-Case

SOP-8L (Note 4)

-

58

-

°C/W

MSOP-8L (Note 4)

-

90

-

°C/W

Notes:

3. Refer to figure 6 for the device derating curve.

4. Test condition for SOP-8L and MSOP-8L: 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