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參數(shù)資料
| 型號(hào)： | AAT2803ISK-4.5-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | Six-Channel White LED Backlight Charge Pump with Flash |
| 中文描述： | 六通道白光LED閃光背光電荷泵 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 596K |
| 代理商： | AAT2803ISK-4.5-T1 |
AAT2803
Six-Channel White LED Backlight
Charge Pump with Flash
2803.2006.04.1.5
1
ChargePump
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
(Advanced Simple Serial Control) 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
μ
A for optimized efficien-
cy, with a low housekeeping current of only 50
μ
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
μ
A.
The AAT2803 is available in a Pb-free, space-saving,
thermally enhanced 24-pin 4x4mm QFN package
and is rated over the -40°C to +85°C temperature
range.
Features
V
IN
Range: 2.7V to 5.5V
Dual Charge Pump:
— Flash: Charge Pump Doubler
— Backlight: Tri-Mode Charge Pump
Backlight Charge Pump:
— Programmable Current With Single GPIO
— 16 Current Steps
— 15/20/30mA Max Current
— Four Low Current Settings
— Individual Main/Sub-Group Control
— Low I
Q
(50
μ
A) for Low-Current Mode
— Drives Six Channels of LEDs
Flash Charge Pump:
— Regulated V
OUT_FL
4.5/5.0 Volts
— 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
μ
A in Shutdown
Available in QFN44-24 Package
Applications
Color (RGB) Lighting
Programmable Current Sink
White LED Backlighting
White Photo Flash for Digital Still Cameras
Typical Application
AAT2803
C
IN
1
μ
F
V
IN
C1
1
μ
F
D2
D1
GND
Backlight
C2
1
μ
F
C3
1
μ
F
C2
+
C
OUT
1
μ
F
ENFL
EN/SET
VIN
EN_FL
Flash
EN/SET
C2
-
C1
+
C1
-
C3
+
C3
-
VOUT
D3
D2
D1
D4
D5
D6
D3
D4
D5
D6
C
OUT
1
μ
F
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| AAT2805IXN-4.5-T1 | Dual High Efficiency Charge Pump for White LED and Flash Applications |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT2805 | 制造商:AAT 制造商全稱:AAT 功能描述:Dual High Efficiency Charge Pump for White LED and Flash Applications |
| AAT2805IXN-4.5-T1 | 制造商:AAT 制造商全稱:AAT 功能描述:Dual High Efficiency Charge Pump for White LED and Flash Applications |
| AAT2806 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual High Efficiency Charge Pump for White LED and Flash Applications |
| AAT2806_07 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual High Efficiency Charge Pump for White LED and Flash Applications |
| AAT2806IXN-4.5-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual High Efficiency Charge Pump for White LED AND Flash Applications |
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