AAT2805
Dual High Efficiency Charge Pump
for White LED and Flash Applications
General Description
The AAT2805 is a dual charge pump designed to
support both the white LED backlight and flash appli-
cations for systems operating with lithium-ion/poly-
mer batteries. The backlight charge pump is capable
of driving up to four LEDs at a total of 120mA. The
current sinks may be operated individually or in par-
allel for driving higher current LEDs. To maximize
power efficiency, the charge pump operates in 1X,
1.5X, or 2X mode, where the mode of operation is
automatically selected by comparing the forward
voltage of each LED with the input voltage.
AnalogicTech's AS
2
Cwire鈩?(Advanced Simple Serial
Control鈩? serial digital input is used to enable, dis-
able, and set current for each LED with a 16-level
logarithmic scale plus four low-current settings down
to 50碌A for optimized efficiency, with a typical oper-
ating quiescent current of less than 50碌A.
The flash charge pump is a charge pump doubler
with a regulated output voltage. It is designed to
deliver 120mA of continuous current and up to
250mA of pulsed current. It has an independent
enable pin for improved power savings.
The AAT2805 has thermal protection and built-in
soft-start circuitry. A low-current shutdown feature
disconnects the load from V
IN
and reduces quiescent
current to less than 1碌A.
The AAT2805 is available in a space-saving, ther-
mally-enhanced TDFN44-16 package and is rated
over the -40擄C to +85擄C temperature range.
Features
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ChargePump
鈩?/div>
鈥?/div>
鈥?/div>
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V
IN
Range: 2.7V to 5.5V
Dual Charge Pump to Support Backlight and
Flash LEDs
Backlight Charge Pump:
鈥?Regulated Current
鈥?Four Current Sink Inputs
鈥?AS
2
Cwire Brightness Control
鈥?Tri-Mode Charge Pump
鈥?Maximum 30mA of Current Per Input
鈥?Low I
Q
(50碌A) in Light Load Mode
Flash Charge Pump:
鈥?Regulated Output Voltage
鈥?Up to 250mA of Pulsed Current
Independent Backlight/Flash Control
Low Noise 1MHz Constant Frequency
Operation
Automatic Soft-Start
No Inductors
Available in TDFN44-16 Package
Applications
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Color (RGB) Lighting
White LED Backlighting
White LED Photo Flash
Typical Application
C1
1碌F
C2
1碌F
C3
1碌F
C1+ C1- C2+ C2- C3+ C3-
VOUT_FL
VIN
V
IN
C
OUT
1碌F
V
OUT_FLASH
Flash
AAT2805
C
IN
1碌F
VOUT_BL
Backlight
D1
EN/SET
EN_FLSH
EN/SET
EN_FLSH
D1
D2
D3
D4
D2
D3
D4
C
OUT
1碌F
GND
2805.2005.05.1.2
1
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