AAT2860 Analogic Corporation, AAT2860 Datasheet

AAT2860

Manufacturer Part Number

AAT2860

Description

Manufacturer

Analogic Corporation

Datasheet

1.AAT2860.pdf (23 pages)

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General Description

The AAT2860-x is a highly integrated charge pump-based

lighting management unit (LMU) with three low dropout

(LDO) regulators optimized for single-cell lithium-ion/

polymer systems. The charge pump provides power for

all LED outputs; multiple backlight and flash LED configu-

rations are available. The backlight LED outputs can be

programmed up to 31mA each and the flash LED outputs

can be programmed up to 300mA each. An I

ble serial digital interface is used to enable, disable, and

set the current to one of 32 levels for the backlight and

one of 16 levels for the flash. A programmable safety

timer and flash control input is included for easy flash

control. Backlight current matching is better than 3% for

uniform display brightness, and flash current matching is

better than 5% for uniform power dissipation.

The AAT2860-x offers three high-performance low-noise

MicroPower™ LDO linear regulators. The regulators are

enabled and their output voltages are set through the

to 300mA load current and ground-pin current is only

80µA making the AAT2860-x ideal for battery-operated

applications.

The AAT2860-x is available in a Pb-free, space saving

TQFN34-24 package and operates over the -40°C to

+85°C ambient temperature range.

Typical Application

ChargePump

2860.2008.05.1.0

C compatible serial interface. Each LDO can supply up

4.7µF

3.6V

BAT

Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit

Flash Level Select

Interface

C Serial

LDO Select

LED Select

4.7µF

SDA

SCL

SDA

C compati-

LED_SEL

FL_LVL

SCL

LDO_SEL

C1+ C1- C2+

AGND

w w w . a n a l o g i c t e c h . c o m

AAT2860-x

1µF

BL6/FL1

BL7/FL2

PGND

LDOC

1µF

LDOA

LDOB

OUT

BL1

BL2

BL3

BL4

BL5

C2-

Features

• Input Voltage Range: 2.7V to 5.5V

• I

• Tri-Mode Charge Pump

• Programmable Backlight Current Settings

• Programmable Flash Current

• 1MHz Switching Frequency

• Automatic Soft-Start

• Three Low Dropout Regulators

• Built-In Thermal Protection

• -40°C to +85°C Temperature Range

• TQFN34-24 Package

Applications

• Camera Enabled Mobile Devices

• Digital Still Cameras

• Multimedia Mobile Phones

▪

2.2µF

C Compatible Serial Interface

Drives up to Seven LEDs (Backlight/Flash)

32 Levels - 0.5mA to 31mA

16 Levels – OFF to 300mA

300mA Output Current

150mV Dropout

Programmable Output from 1.5V to 3.0V

Output Auto-Discharge for Fast Shutdown

2.2µF

OUT

LDOC

OSRAM LW M673

at 300mA

or equivalent

WLEDs

LDOC

OUT

2.2µF

LDOB

PRODUCT DATASHEET

at 300mA

LDOB

Lumiled LXCL-PWF1

AAT2860

or equivalent

Flash LEDs

2.2µF

LDOA

at 300mA

LDOA

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