PRODUCT DATASHEET
AAT2860
TM
ChargePump
Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit
General Description
Features
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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 I2C compati-
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.
Input Voltage Range: 2.7V to 5.5V
I2C Compatible Serial Interface
Tri-Mode Charge Pump
Drives up to Seven LEDs (Backlight/Flash)
Programmable Backlight Current Settings
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32 Levels - 0.5mA to 31mA
Programmable Flash Current
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16 Levels – OFF to 300mA
1MHz Switching Frequency
Automatic Soft-Start
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Three Low Dropout Regulators
300mA Output Current
150mV Dropout
Programmable Output from 1.5V to 3.0V
Output Auto-Discharge for Fast Shutdown
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Built-In Thermal Protection
-40°C to +85°C Temperature Range
TQFN34-24 Package
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
I2C compatible serial interface. Each LDO can supply up
to 300mA load current and ground-pin current is only
80µA making the AAT2860-x ideal for battery-operated
applications.
Applications
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Camera Enabled Mobile Devices
Digital Still Cameras
Multimedia Mobile Phones
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
C1
1µF
C2
1µF
WLEDs
OSRAM LW M673
or equivalent
C1+ C1- C2+ C2-
VOUT
IN
OUT
Flash LEDs
Lumiled LXCL-PWF1
or equivalent
VBAT
3.6V
CIN
4.7µF
COUT
2.2µF
AAT2860-x
IN
BL1
CIN
4.7µF
BL2
LED Select
LED_SEL
BL3
BL4
BL5
FL_LVL
SDA
Flash Level Select
BL6/FL1
BL7/FL2
SDA
I2C Serial
Interface
VLDOA
at 300mA
LDOA
SCL
SCL
CLDOA
2.2µF
VLDOB
at 300mA
LDOB
LDO Select
LDO_SEL
CLDOB
2.2µF
VLDOC
LDOC
PGND
at 300mA
AGND
CLDOC
2.2µF
w w w . a n a l o g i c t e c h . c o m
2860.2008.05.1.0
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