AS3661 datasheet(2/87 Pages) AMSCO

2 / 87 page

A S 3 6 6 1

P r o g r a m m a b l e 9 - c h a n n e l L E D D r i v e r

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Revision 1.3

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D a ta s h e e t

1 General Description

The AS3661 is a 9-channel LED driver designed to

produce lighting effects for mobile devices. A high-

efficiency charge pump enables LED driving over full Li-

Ion battery voltage range. The device is equipped with

an internal program memory, which allows operation

without processor control. The AS3661 maintains

excellent efficiency over a wide operating range by

autonomously selecting the best charge pump gain

based on LED forward voltage requirements. AS3661 is

able to automatically enter power-save mode when LED

outputs are not active, thus lowering idle current

consumption down to 10 µA (typ).

The AS3661 has an I2C-compatible control interface

with four pin selectable addresses. Also, the device has

a flexible General Purpose Output (GPO), which can be

used as a digital control pin for other devices. INT pin

can be used to notify processor when a lighting

sequence has ended (interrupt - function). Also, the

device has a trigger input interface, which allows

synchronization between multiple devices.The device

requires only four small and low-cost ceramic

capacitors.

The AS3661 is available in a tiny WL-CSP-25

(2.285x2.285mm) 0.4mm pitch package.

2 Key Features

Three independent program execution engines; 9

programmable outputs with 25.5 mA full-scale

current, 8- bit current setting resolution and 12-bit

PWM control resolution

Adaptive charge pump with 1x and 1.5x gain

provides up to 95% LED drive efficiency

Charge pump with soft start and overcurrent/short

circuit protection

Built-in LED test

Automatic power save mode; IVDD = 10 µA (typ.)

Two wire, I2C-compatible, control interface

Flexible instruction set

Large SRAM program memory

Small application circuit

Source (high side) drivers

Minimum number of external components

Architecture supports color control

3 Applications

The product is ideal for fun and indicator lights, LED

backlighting, and programmable current source.

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Figure 1. AS3661 LED Driver Block Diagram

AS3661 数据表(PDF) 2 Page - ams AG

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