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參數(shù)資料
| 型號(hào)： | AAT2842 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | High-Current Charge Pump with S2Cwire⑩ Control and Dual LDO for Backlight and Flash |
| 中文描述： | 大電流電荷泵的單線簡(jiǎn)易串行控制⑩控制背光和閃光雙路LDO |
| 文件頁(yè)數(shù)： | 1/21頁(yè) |
| 文件大?。?/td> | 602K |
| 代理商： | AAT2842 |
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AAT2842
High-Current Charge Pump with S
2
Cwire
Control and Dual LDO for Backlight and Flash
2842.2006.10.1.0
1
ChargePump
General Description
The AAT2842 is a highly integrated charge pump
with dual linear regulators optimized for systems
operating with lithium-ion/polymer batteries. The
charge pump provides power for both white LED
backlight/keypad and flash. Up to four backlight
LEDs can be driven at up to 30mA each and key-
pad LEDs can be driven using lower currents set by
the S
2
Cwire interface. In addition, up to four flash
LEDs can be driven with up to 600mA total. Two
separate S
2
Cwire (Simple Serial Control) serial
digital interfaces are used to enable, disable, and
set the current to one of 16 levels for both backlight
and flash LEDs. Backlight/keypad and flash current
settings are also controlled through external resis-
tors for increased versatility with reduced accuracy
and matching. Backlight/keypad current matching
is 1% for uniform display brightness, and flash cur-
rent matching is 4% for uniform power dissipation.
An integral flash timer set by an external capacitor
protects the flash LED should a fault occur.
The AAT2842 offers two high-performance
MicroPower low dropout (LDO) linear regulators.
A single enable input controls both regulators and
each supplies up to 200mA to the load. Both LDOs
consume only 85μA quiescent current, making
them ideal for battery-operated applications.
The AAT2842 is equipped with built-in short-circuit
and over-temperature protection. The charge pump
soft-start circuitry prevents excessive inrush current
at start-up. The product is available in a Pb-free,
space-saving TQFN44-28 package and operates
over the -40°C to +85°C ambient temperature range.
Features
V
IN
Range: 2.7V to 5.5V
Tri-Mode Charge Pump:
— Drives up to Four Backlight/Keypad and
Four Flash LEDs
— Separate S
2
Cwire Control for
Backlight/Keypad and Flash Currents
— Backlight/Keypad and Flash Current Set
by Separate External Resistors
— Flash Timer Set with External Capacitor
— Up to 2MHz Switching Frequency
Two Linear Regulators:
— 200mA Output Current
— 200mV Dropout
— Output Voltage Adjustable from 1.2V to
V
BATTERY
— Output Auto-Discharge for Fast Shutdown
— 85μA Quiescent Current
Built-In Thermal Protection
Automatic Soft Start
-40°C to +85°C Temperature Range
Available in 4x4mm TQFN44-28 Package
Applications
Camera-Enabled Mobile Devices
Digital Still Cameras
Multimedia Mobile Phones
Typical Application
C1+
C1-
C2+
C2-
IN
C1
1μF
C2
1μF
C
2.2μF
C
IN
4.7μF
OUT
BL1
BL2
BL3
BL4
FL1
FL2
FL3
FL4
BENS
EN_BACKLIGHT
ENL
EN_LDO
V
OUT
LDOA
C
OUTA
R
2A
R
1A
OUTA
FBA
V
OUT
LDOB
C
OUTB
R
2B
R
1B
OUTB
FBB
C
REF
REF
V
BAT
R
SET1
R
SET2
FSET
BSET
PGND
FENS
EN_FLASH
IN
C
T
CT
AGND
AAT2842
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT2842IBJ-EE-T1 | High-Current Charge Pump with S2Cwire⑩ Control and Dual LDO for Backlight and Flash |
| AAT2845A | Four-Channel Backlight Driver with Dual LDOs |
| AAT2845AIML-EE-T1 | Four-Channel Backlight Driver with Dual LDOs |
| AAT2845 | Four-Channel Backlight Driver with Dual LDOs |
| AAT2845IML-EE-T1 | Four-Channel Backlight Driver with Dual LDOs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT2842_07 | 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:High-Current Charge Pump with S2Cwire⑩ Control and Dual LDO for Backlight and Flash |
| AAT2842IBJ-EE-T1 | 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:High-Current Charge Pump with S2Cwire⑩ Control and Dual LDO for Backlight and Flash |
| AAT2842INJ-EE-T1 | 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:High-Current Charge Pump with S2Cwire⑩ Control and Dual LDO for Backlight and Flash |
| AAT2845 | 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:Four-Channel Backlight Driver with Dual LDOs |
| AAT2845_08 | 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:Four-Channel Backlight Driver with Dual LDOs |
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