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AAT2842 Datenblatt(PDF) 1 Page - Advanced Analogic Technologies

Teilenummer AAT2842
Bauteilbeschribung  High-Current Charge Pump with S2Cwire??Control and Dual LDO for Backlight and Flash
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Hersteller  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

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AAT2842
High-Current Charge Pump with S2Cwire™
Control and Dual LDO for Backlight and Flash
2842.2006.10.1.0
1
ChargePump
General Description
The AAT2842 is a highly integrated charge pump
with dual linear regulators optimized for systems
operating with lithium-ion/polymer batteries. The
charge pump provides power for both white LED
backlight/keypad and flash. Up to four backlight
LEDs can be driven at up to 30mA each and key-
pad LEDs can be driven using lower currents set by
the S2Cwire interface. In addition, up to four flash
LEDs can be driven with up to 600mA total. Two
separate S2Cwire™ (Simple Serial Control™) serial
digital interfaces are used to enable, disable, and
set the current to one of 16 levels for both backlight
and flash LEDs. Backlight/keypad and flash current
settings are also controlled through external resis-
tors for increased versatility with reduced accuracy
and matching. Backlight/keypad current matching
is 1% for uniform display brightness, and flash cur-
rent matching is 4% for uniform power dissipation.
An integral flash timer set by an external capacitor
protects the flash LED should a fault occur.
The AAT2842 offers two high-performance
MicroPower™ low dropout (LDO) linear regulators.
A single enable input controls both regulators and
each supplies up to 200mA to the load. Both LDOs
consume only 85µA quiescent current, making
them ideal for battery-operated applications.
The AAT2842 is equipped with built-in short-circuit
and over-temperature protection. The charge pump
soft-start circuitry prevents excessive inrush current
at start-up. The product is available in a Pb-free,
space-saving TQFN44-28 package and operates
over the -40°C to +85°C ambient temperature range.
Features
•VIN Range: 2.7V to 5.5V
Tri-Mode Charge Pump:
— Drives up to Four Backlight/Keypad and
Four Flash LEDs
— Separate S2Cwire Control for
Backlight/Keypad and Flash Currents
— Backlight/Keypad and Flash Current Set
by Separate External Resistors
— Flash Timer Set with External Capacitor
— Up to 2MHz Switching Frequency
Two Linear Regulators:
— 200mA Output Current
— 200mV Dropout
— Output Voltage Adjustable from 1.2V to
VBATTERY
— Output Auto-Discharge for Fast Shutdown
— 85µA Quiescent Current
Built-In Thermal Protection
Automatic Soft Start
-40°C to +85°C Temperature Range
Available in 4x4mm TQFN44-28 Package
Applications
Camera-Enabled Mobile Devices
Digital Still Cameras
Multimedia Mobile Phones
Typical Application
C1+
C1- C2+
C2-
IN
C1
1µF
C2
1µF
COUT
2.2µF
CIN
4.7µF
OUT
BL1
BL2
BL3
BL4
BENS
EN_BACKLIGHT
ENL
EN_LDO
VOUT LDOA
R2A
R1A
OUTA
FBA
COUTA
VOUT LDOB
R2B
R1B
OUTB
FBB
COUTB
CREF
REF
VBAT
RSET1
RSET2
FSET
BSET
PGND
FENS
EN_FLASH
IN
FL1
FL2
FL3
FL4
CT
CT
AGND
AAT2842


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