PRODUCT DATASHEET
AAT2860
ChargePump
TM
Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit
Features
• Input Voltage Range: 2.7V to 5.5V
• I
2
C Compatible Serial Interface
• Tri-Mode Charge Pump
▪
Drives up to Seven LEDs (Backlight/Flash)
• Programmable Backlight Current Settings
▪
32 Levels - 0.5mA to 31mA
• Programmable Flash Current
▪
16 Levels – OFF to 300mA
• 1MHz Switching Frequency
• Automatic Soft-Start
• Three Low Dropout Regulators
▪
300mA Output Current
▪
150mV Dropout
▪
Programmable Output from 1.5V to 3.0V
▪
Output Auto-Discharge for Fast Shutdown
• Built-In Thermal Protection
• -40°C to +85°C Temperature Range
• TQFN34-24 Package
General Description
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 I
2
C 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.
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
I
2
C 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.
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.
Applications
• Camera Enabled Mobile Devices
• Digital Still Cameras
• Multimedia Mobile Phones
Typical Application
C1
1µF
C2
1µF
C1+ C1- C2+
IN
V
BAT
3.6V
C
IN
4.7µF
IN
C
IN
4.7µF
LED Select
Flash Level Select
I
2
C Serial
Interface
SDA
SCL
LED_SEL
FL_LVL
SDA
SCL
LDO_SEL
C2-
OUT
WLEDs
OSRAM LW M673
or equivalent
V
OUT
C
OUT
2.2µF
Flash LEDs
Lumiled LXCL-PWF1
or equivalent
AAT2860-x
BL1
BL2
BL3
BL4
BL5
BL6/FL1
BL7/FL2
LDOA
LDOB
LDOC
AGND
PGND
V
LDOA
at 300mA
V
LDOB
at 300mA
V
LDOC
at 300mA
C
LDOC
2.2µF
C
LDOB
2.2µF
C
LDOA
2.2µF
LDO Select
2860.2008.05.1.0
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