Datasheet > AAT2848

AAT2848

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		泵
页数	文件大小	规格书
19页	2625K
描述
High-Current Charge Pump For Backlight Display and Flash Applications

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PRODUCT DATASHEET

AAT2848

ChargePump

High-Current Charge Pump For Backlight Display and Flash Applications

General Description

Features

The AAT2848 is a tri-mode charge pump optimized for

systems operating with lithium-ion/polymer batteries. The

charge pump provides power for both white LED backlight

and flash, with an integrated four channel backlight LED

current sink plus two channel flash LED current sinks.

• Tri-Mode (1x/1.5x/2x) Charge Pump

• Four 30mA Backlight LED Channels

• Independent S²Cwire Control for Backlight

• 32-Level Programmable Backlight Current Control—

Linear, Inverting

• Two 300mA Flash LED Channels

• Independent S²Cwire Control for Flash

• 16-Level Programmable Flash Current Control—

Linear, Inverting

• User-Programmable Full Scale Current for Backlight

and Flash

• User-Programmable Fade-In/Fade-Out Function for

Backlight

• User-Programmable Safety Timer for Flash LED

Protection

Each backlight channel can drive up to 30mA, while each

flash current sink/channel can drive up to 300mA (600mA

total). Two independent S²Cwire™ (AnalogicTech’s Simple

Serial Control™) serial digital interface inputs enable,

disable, and set LED current to one of 32 levels for the

backlight and to one of 16 levels for the flash, with full-

scale current independently set for backlight and flash

using external resistors.

The AAT2848 offers a built-in fade-in/out function for

linear control of the backlight current during ON/OFF

transitions. The fade time is programmable by an exter-

nal capacitor.

• Built-In Thermal Protection

• Automatic Soft-Start

• -40°C to +85°C Temperature Range

• Available in TQFN33-20 Package

The AAT2848 also offers a built-in flash timeout function

as a safety feature associated with the high power flash

driver. The safety timer is also programmable via an

external capacitor.

Applications

• Camera Enabled Mobile Devices

• Digital Still Cameras

The AAT2848 is equipped with built-in short-circuit and

over-temperature protection. The soft-start circuitry pre-

vents excessive inrush current at start-up and mode

transitions. The AAT2848 is available in a Pb-free, space

saving TQFN33-20 package and operates over the -40°C

to +85°C ambient temperature range.

• Multimedia Mobile Phones

Typical Application

1μF

WLEDs

OSRAM LW M673

or equivalent

C1+

C1-

C2- C2+

OUT

Flash LEDs

Lumileds PWF1

C_OUT

V_BAT

C_IN

4.7μF

or equivalent

2.2μF

AAT2848

BL1

S²Cwire

BL2

BL3

BL4

BENS

FENS

Backlight Control

S²Cwire

Flash Control

FL1

FL2

BSET

FSET

R_BSET

15k

R_FSET

14.3k

FLTMR

FADE

AGND

C_FLTMR

330nF

C_FADE

47nF

PGND

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

2848.2008.05.1.0

12 3 4 5 6 7...19

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