Six-Channel White LED Backlight
Charge Pump with Flash
General Description
The AAT2803 is a dual charge pump designed to sup-
port both white LED backlight and flash applications
for systems operating with lithium-ion/polymer batter-
ies. The backlight charge pump is capable of driving
up to six LEDs at a total of 180mA. The current sinks
may be operated in group or in parallel 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 select-
ed by comparing the forward voltage of each LED
with the input voltage. AnalogicTech's AS
2
Cwire鈩?/div>
(Advanced Simple Serial Control鈩? serial digital input
is used to enable, disable, and set current for each
LED with a 16-level logarithmic scale plus four low-
current settings down to 50渭A for optimized efficien-
cy, with a low housekeeping current of only 50渭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
300mA of pulsed current. It has an independent
enable pin for improved power savings.
The AAT2803 is equipped with built-in protection,
short-circuit, and auto-disable for load short-circuit
condition. Built-in soft-start circuitry prevents exces-
sive inrush current during start-up. A low-current
shutdown feature disconnects the load from V
IN
and
reduces quiescent current to less than 1渭A.
The AAT2803 is available in a Pb-free, space-saving,
thermally enhanced 24-pin 4x4mm QFN package
and is rated over the -40擄C to +85擄C temperature
range.
AAT2803
Features
鈥?/div>
鈥?/div>
鈥?/div>
ChargePump
鈩?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
V
IN
Range: 2.7V to 5.5V
Dual Charge Pump:
鈥?Flash: Charge Pump Doubler
鈥?Backlight: Tri-Mode Charge Pump
Backlight Charge Pump:
鈥?Programmable Current With Single GPIO
鈥?16 Current Steps
鈥?15/20/30mA Max Current
鈥?Four Low Current Settings
鈥?Individual Main/Sub-Group Control
鈥?Low I
Q
(50渭A) for Low-Current Mode
鈥?Drives Six Channels of LEDs
Flash Charge Pump:
鈥?Regulated V
OUT_FL
4.5/5.0 Volts
鈥?Up to 300mA of Current for Flash
1MHz Constant Switching Frequency
Independent Backlight/Flash Control
Built-In Thermal Protection
Built-In Auto-Disable for Open Circuit
Automatic Soft Start
I
Q
<1渭A in Shutdown
Available in QFN44-24 Package
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Color (RGB) Lighting
Programmable Current Sink
White LED Backlighting
White Photo Flash for Digital Still Cameras
Typical Application
C1
1渭F
C2
1渭F
C3
1渭F
C1
+
VIN
V
IN
C
IN
1渭F
C1
-
C2
+
C2
-
C3
+
C3
-
VOUT
C
OUT
1渭F
Flash
AAT2803
D6
D5
D4
D3
D2
Backlight
D1
EN_FL
ENFL
C
OUT
1渭F
EN/SET
EN/SET
GND
D6
D5
D4
D3
D2
D1
2803.2006.04.1.5
1
AAT2803ISK-4.5-T1相關(guān)型號PDF文件下載
-
型號
版本
描述
廠商
下載
-
英文版
500mA Low Noise Step-Down Converter
ANALOGICTECH
-
英文版
500mA Low Noise Step-Down Converter
ANALOGICTECH&nb...
-
英文版
Low Noise, Fast Transient 600mA Step-Down Converter
ANALOGICTECH
-
英文版
Low Noise, Fast Transient 600mA Step-Down Converter
ANALOGICTECH&nb...
-
英文版
2.5A Low Noise Step-Down Converter
ANALOGICTECH
-
英文版
1.5A Low Noise Step-Down Converter
ANALOGICTECH
-
英文版
1.5A Low Noise Step-Down Converter
ANALOGICTECH&nb...
-
英文版
1MHz Step-Down Converter/LDO Regulator
ANALOGICTECH
-
英文版
1MHz Step-Down Converter/LDO Regulator
ANALOGIC
-
英文版
Adjustable 3-Channel Regulator
ANALOGICTECH
-
英文版
Adjustable 3-Channel Regulator
ANALOGICTECH&nb...
-
英文版
Adjustable 3-Channel Regulator
ANALOGICTECH
-
英文版
Adjustable 3-Channel Regulator
ANALOGICTECH&nb...
-
英文版
Dual Channel, Step-Down Converter/Linear Regulator
ANALOGICTECH
-
英文版
Dual Channel, Step-Down Converter/Linear Regulator
ANALOGICTECH&nb...
-
英文版
1MHz Step-Down Converter/LDO Regulator
ANALOGICTECH
-
英文版
1MHz Step-Down Converter/LDO Regulator
ANALOGIC
-
英文版
Dual 400mA, 1MHz Step-Down DC-DC Converter
ANALOGICTECH
-
英文版
Dual 400mA, 1MHz Step-Down DC-DC Converter
ANALOGICTECH&nb...
-
英文版
Dual 600mA, 1MHz Step-Down DC/DC Converter
ANALOGICTECH
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
