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AAT2856_08 Datasheet

  • AAT2856_08

  • High Current Charge Pump with Dual LDO for Backlight Applica...

  • 18頁(yè)

  • ANALOGICTECH

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PRODUCT DATASHEET
AAT2856
ChargePump
TM
High Current Charge Pump with Dual LDO for Backlight Applications
Features
鈥?Input Voltage Range: 2.7V to 5.5V
鈥?Tri-Mode Charge Pump:
鈻?/div>
Drives up to Six Backlight LEDs
鈻?/div>
32 Programmable Backlight Current Settings
Ranging from 115渭A to 30mA
鈻?/div>
2MHz Switching Frequency
鈥?Two Linear Regulators:
鈻?/div>
200mA Output Current
鈻?/div>
200mV Dropout Voltage
鈻?/div>
Output Voltage Adjustable from 1.2V to V
BATTERY
鈻?/div>
Output Auto-Discharge for Fast Shutdown
鈻?/div>
Individual LDO Enable Inputs
鈥?Built-In Thermal Protection
鈥?Automatic Soft Start
鈥?-40擄C to +85擄C Temperature Range
鈥?TQFN44-28 Package
General Description
The AAT2856 is a highly integrated charge pump with
dual linear regulators optimized for systems powered
from lithium-ion/polymer batteries. The charge pump
provides power for white LED backlight. Six backlight
LEDs can be driven at up to 30mA. AnalogicTech鈥檚
AS
2
Cwire鈩?(Advanced Simple Serial Control鈩? single-
wire interface is used to enable, disable, and set the
current to one of 32 levels for the backlight. Backlight
current matching is 1% for uniform display brightness.
The AAT2856 offers two high-performance low-noise
MicroPower鈩?low dropout (LDO) linear regulators. Both
regulators use individual enable inputs and each will
supply up to 200mA load current. LDO ground pin cur-
rent is only 80渭A, making the AAT2856 ideal for battery-
operated applications.
The AAT2856 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 AAT2856 is available in a Pb-free TQFN44-28 pack-
age and operates over the -40擄C to +85擄C ambient
temperature range.
Applications
鈥?Camera-Enabled Mobile Devices
鈥?Digital Still Cameras
鈥?Multimedia Mobile Phones
Typical Application
C
1
1渭F
C1+ C1-
IN
C
IN
4.7渭F
C
2
1渭F
C2+ C2-
OUT
C
OUT
2.2渭F
IN
BL1
BL2
BL3
BL4
BL5
BL6
OUTA
C
BYP
0.1渭F
REF
FBA
R
1A
R
2A
C
OUTA
2.2渭F
V
OUTA
V
OUT
V
BAT
WLEDs
OSRAM LW M673
or equivalent
AAT2856
ENABLE/SET
ENS
EN_LDOA
EN_LDOB
ENA
ENB
AGND
OUTB
R
2B
FBB
PGND
R
1B
V
OUTB
C
OUTB
2.2渭F
2856.2008.02.1.3
www.analogictech.com
1

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