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Diodes AP3154A User Manual

Ap3154a, Typical application circuit, Features

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AP3154A

120mA HIGH EFFICIENCY WHITE LED DRIVER

AP3154A Rev. 1

1

of

14

AUGUST 2009

www.diodes.com

©

Diodes Incorporated

Up to 88% Max power efficiency

Wide input voltage range: 2.7V ~ 5.5V

1x, 1.5x, and 2x charge-pump modes

Drive up to 4 white LEDs

Default maximum current setting: 20mA each channel

120mA maximum output current through 4 channels

Programmable switching frequency, default 1.2MHz

Spread Spectrum Control with 10% frequency deviation

1-wire Serial Digital Interface (SDI) or PWM for dimming
control

Soft-start during power-up and mode switching

Soft-stop during shutdown

• Short-circuit

protection

Over-voltage protection and under-voltage lockout

Low shutdown current < 6

µ

A

Industry-leading low profile package

Lead Free package: DFN3030-12

DFN3030-12: Available in “Green” Molding Compound
(No Br, Sb)

Lead Free Finish / RoHS Compliant (Note 1)

The AP3154A is a high efficiency charge-pump white LED driver
with 1x, 1.5x, 2x operating modes. The AP3154A operates on
power supplies from 2.7v to 5.5v. It drives up to four channels of
white LEDs while the intensity of each channel is configured by
varying the respective current levels. Each channel can supply up
to 30mA current. Up to four channels can be ganged together to
provide maximum load current of 120mA. By default, all
4 channels are set to the minimum current level after the chip is
enabled or back from shutdown mode.

The Serial Digital Interface (SDI) provides the capability to
configure the current for each LED channel. Some other key
features, such as Up Spread Spectrum Control, different
charge-pump switching frequencies (0.6MHz/1.2MHz/1.8MHz),
and PWM dimming control, can also be programmed through the
interface.

The AP3154A has a built-in soft-start circuit to minimize the inrush
current during power-up and mode switching. Various protections
such as short-circuit, over-voltage, under-voltage, and thermal
shutdown are integrated to ensure system reliability. The
quiescent current of AP3154A during shutdown is less than 6

µ

A.

• Mobile

Phone

PDA (Personal Digital Assistant)

White LED Backlighting

Camera Flash LED Lighting

• LCD

Modules

• Portable

Devices

Typical Application Circuit

V

IN

1uF

C

IN

AP3154A

C2

P

C2

N

C1

N

V

OUT

D4

D1

D2

D3

GND

SDI

SDI

2

8

V

IN

1uF

C

2

7

6

1uF

C

1

4

3

C1

P

9

5

1

D4

LED

12

D3

LED

11

D2

LED

10

D1

LED

1uF

C

OUT

Features

General Description

Applications