AL8805

HIGH EFFICIENCY 30V 1A BUCK LED DRIVER

AL8805

Document number: DS35030 Rev. 1 - 2

3 of 16

www.diodes.com

September 2010

© Diodes Incorporated

Electrical Characteristics

Symbol

Parameter

Conditions

Min

Typ.

Max

Unit

5.9

V

Internal regulator hysteresis

threshold

100

300

mV

Quiescent current

Output not switching

‡

350

µA

Input supply Current

CTRL pin floating f = 250kHz

1.8

5

mA

Set current Threshold Voltage

95

100

105

mV

Set threshold hysteresis

±20

mV

SET pin input current

16

22

µA

CTRL pin input resistance

Referred to internal reference

50

k

Ω

Internal Reference Voltage

2.5

V

On Resistance of SW MOSFET

0.25

0.4

Ω

Switch leakage current

0.5

μA

Switching Frequency

1

MHz

θ

JA

Thermal Resistance Junction-to-

Ambient

SOT25 (Note 3)

250

°C/W

Notes: 2.

Refer to figure 34 for the device derating curve.

3.

Test condition for SOT25: Device mounted on FR-4 PCB (25mm x 25mm 1oz 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.

‡

AL8805 does not have a low power standby mode but current consumption is reduced when output switch is inhibited: