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AAT2860IMK-3-T1 Datasheet

  • AAT2860IMK-3-T1

  • Backlight/Flash LED Driver and Multiple LDO Lighting Managem...

  • 23頁

  • ANALOGICTECH

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PRODUCT DATASHEET
AAT2860
ChargePump
TM
Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit
Features
鈥?Input Voltage Range: 2.7V to 5.5V
鈥?I
2
C Compatible Serial Interface
鈥?Tri-Mode Charge Pump
鈻?/div>
Drives up to Seven LEDs (Backlight/Flash)
鈥?Programmable Backlight Current Settings
鈻?/div>
32 Levels - 0.5mA to 31mA
鈥?Programmable Flash Current
鈻?/div>
16 Levels 鈥?OFF to 300mA
鈥?1MHz Switching Frequency
鈥?Automatic Soft-Start
鈥?Three Low Dropout Regulators
鈻?/div>
300mA Output Current
鈻?/div>
150mV Dropout
鈻?/div>
Programmable Output from 1.5V to 3.0V
鈻?/div>
Output Auto-Discharge for Fast Shutdown
鈥?Built-In Thermal Protection
鈥?-40擄C to +85擄C Temperature Range
鈥?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鈩?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
80碌A(chǔ) 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
C1
1碌F
C2
1碌F
C1+ C1- C2+
IN
V
BAT
3.6V
C
IN
4.7碌F
IN
C
IN
4.7碌F
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
2.2碌F
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
2.2碌F
C
LDOB
2.2碌F
C
LDOA
2.2碌F
LDO Select
2860.2008.05.1.0
www.analogictech.com
1

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