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參數(shù)資料
| 型號： | TQFN34-20 |
| 廠商： | ANADIGICS, Inc. |
| 英文描述： | Four-Channel Backlight Driver with Dual LDOs |
| 中文描述： | 四通道雙LDO的背光驅(qū)動器 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 392K |
| 代理商： | TQFN34-20 |
AAT2847
Four-Channel Backlight Driver with Dual LDOs
2847.2007.09.1.0
1
ChargePump
General Description
The AAT2847 is a highly integrated power solution
for single cell Li-Ion/Polymer based liquid crystal
display (LCD) display applications. It includes a
four channel light emitting diode (LED) backlight
driver and two integrated 200mA low dropout volt-
age regulators (LDOs) as additional power sup-
plies for display and camera related chipsets.
The backlight driver in the AAT2847 is a low noise
tri-mode DC/DC charge pump converter. Each of
the four channels of the backlight driver is capable
of delivering up to 20mA of bias currents for white
LEDs. The white LED (WLED) backlight bias cur-
rent matching is 1% which helps provide uniform
display brightness.
AnalogicTech’s AS
2
Cwire (Advanced Simple
Serial Control) serial digital interface is used to
enable, disable, and set the current for each back-
light LED channel. Each LED channel has sixteen
available current level settings in three separate
current scales, plus four available current level set-
tings on a low level current scale.
Each LED channel is equipped with built-in short
circuit protection and auto disable functionality. A
low shutdown current feature disconnects the load
from the input and reduces quiescent current to
less than 1μA.
The AAT2847 is available in the thermally
enhanced 20-pin 3x4x0.75mm TQFN package.
Features
Input Supply Voltage Range: 2.7V to 5.5V
Tri-Mode (1X/1.5X/2X) Charge Pump:
— Delivers up to 120mA of Output Current
Integrated LCD Display Solution:
— Four-Channel WLED Backlight
User-Programmable WLED Current
Scales: 30mA, 20mA and 15mA.
— Sixteen Programmable Current
Level Settings
User Selectable Low Level Current Scale
— Four Programmable Current
Level Settings
— Dual 200mA LDOs (w/Separate Enables)
Single-Wire AS
2
Cwire Serial Interface for
Configuration/Control
— Four Addressable Registers
— Fast, 1MHz Serial Interface
> 90% Peak Efficiency
LDO Output Voltages:
— AAT2847-EE: User-Programmable
— AAT2847-QG: 2.8V and 1.5V
— AAT2847-QI: 2.8V and 1.8V
Over-Temperature Protection
Available in 3x4x0.75mm TQFN34-20 Package
-40°C to +85°C Temperature Range
Applications
Camera Function Power Supplies
Camera Phone Displays
LCD Modules
White LED Backlighting
Typical Application
C1
1μF
C2
C1- C1+ C2-
C2+
IN
OUT
D1
D2
D3
D4
200mA
LDOA
V
BAT
3.6V
C
IN
2.2μF
AAT 2847-EE
EN/SET
2
Cwire
BacAS
C
OUT
1μF
LDOA
C
200mA
LDOB
LDOB
C
IN
FBA
FBB
WLEDs
Oor equivalent
GND
PGND
ENA
LDO A Enable
ENB
LDO B Enable
C1
1μF
C2
1μF
C1- C1+ C2-
C2+
IN
OUT
D1
D2
D3
D4
OUTA
2.8V
LDOA
BAT
V
IN
2C
AAT2847-QI
GND
EN/SET
2
Cwire
BaAS
C
OUT
1μF
LDOA
C
LDOB
C
2.2μF
ENA
LDO A Enable
IN
WLEDs
Oor equivalent
V
1.8V, 200mA
ENB
LDO B Enable
PGND
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