AAT2805IXN-4.5-T1 Advanced Analogic Technologies, Inc., AAT2805IXN-4.5-T1 Datasheet

AAT2805IXN-4.5-T1

Manufacturer Part Number

AAT2805IXN-4.5-T1

Description

Manufacturer

Advanced Analogic Technologies, Inc.

Datasheets

1.AAT2805IXN-4.5-T1.pdf (16 pages)

2.AAT2805IXN-4.5-T1.pdf (16 pages)

Specifications of AAT2805IXN-4.5-T1

Date_code

07+

Packing_info

TDFN44-16

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AAT2805IXN-4.5-T1

Manufacturer:

analogic

Quantity:

22 000

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

AAT2805IXN-4.5-T1

Manufacturer:

AAT

Quantity:

2 848

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General Description

The AAT2805 is a dual charge pump designed to

support both the white LED backlight and flash appli-

cations for systems operating with lithium-ion/poly-

mer batteries. The backlight charge pump is capable

of driving up to four LEDs at a total of 120mA. The

current sinks may be operated individually or in par-

allel for driving higher current LEDs. To maximize

power efficiency, the charge pump operates in 1X,

1.5X, or 2X mode, where the mode of operation is

automatically selected by comparing the forward

voltage of each LED with the input voltage.

AnalogicTech's AS

Control™) serial digital input is used to enable, dis-

able, and set current for each LED with a 16-level

logarithmic scale plus four low-current settings down

to 50µA for optimized efficiency, with a typical oper-

ating quiescent current of less than 50µA.

The flash charge pump is a charge pump doubler

with a regulated output voltage. It is designed to

deliver 120mA of continuous current and up to

250mA of pulsed current. It has an independent

enable pin for improved power savings.

The AAT2805 has thermal protection and built-in soft-

start circuitry. A low-current shutdown feature discon-

nects the load from V

rent to less than 1µA.

The AAT2805 is available in a Pb-free, space-saving,

thermally-enhanced TDFN44-16 package and is

rated over the -40°C to +85°C temperature range.

Typical Application

2805.2007.09.1.8

Cwire™ (Advanced Simple Serial

and reduces quiescent cur-

EN_FLSH

1μF

EN/SET

VIN

EN/SET

EN_FLSH

C1+ C1- C2+ C2- C3+ C3-

1μF

AAT2805

GND

1μF

for White LED and Flash Applications

VOUT_FL

VOUT_BL

Dual High Efficiency Charge Pump

1μF

Features

•

Applications

•

Dual Charge Pump to Support Backlight and

Flash LEDs

Backlight Charge Pump:

— Regulated Current

— Four Current Sink Inputs

— AS

— Tri-Mode Charge Pump

— Maximum 30mA of Current Per Input

— Low I

Flash Charge Pump:

— Regulated Output Voltage

— Up to 250mA of Pulsed Current

Independent Backlight/Flash Control

Low Noise 1MHz Constant Frequency

Operation

Automatic Soft-Start

No Inductors

Available in TDFN44-16 Package

Color (RGB) Lighting

White LED Backlighting

White LED Photo Flash

1μF

Range: 2.7V to 5.5V

OUT

Cwire Brightness Control

OUT_FLASH

Flash

(50µA) in Light Load Mode

Backlight

ChargePump

1μF

OUT

AAT2805

™

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