參數(shù)資料
型號(hào)： AAT2846INJ-EE-T1
廠商： Advanced Analogic Technologies, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： High Current Charge Pump with Dual LDO for Backlight and Flash Applications
中文描述： 高電流電荷泵與背光和閃光燈應(yīng)用雙路LDO
文件頁(yè)數(shù)： 1/25頁(yè)
文件大小： 554K
代理商： AAT2846INJ-EE-T1
AAT2846
High Current Charge Pump with Dual LDO
for Backlight and Flash Applications
2846.2007.08.1.0
1
ChargePump
General Description
The AAT2846 is a highly integrated charge pump
with dual linear regulators optimized for systems
powered from lithium-ion/polymer batteries. The
charge pump provides power for both white LED
backlight and flash. Six backlight LEDs can be driv-
en at up to 30mA each, while up to two flash LEDs
can be driven at up to 600mA total. AnalogicTech's
AS
2
Cwire (Advanced Simple Serial Control) sin-
gle-wire interface is used to enable, disable, and set
the current to one of 32 levels for the backlight and
one of 16 levels for the flash. An external resistor sets
the maximum flash current. Backlight current match-
ing is 1% for uniform display brightness, and flash
current matching is 4% for uniform power dissipation.
The AAT2846 offers two high-performance low-
noise MicroPower low dropout (LDO) linear regu-
lators. Both regulators use individual enable inputs
and each will supply up to 200mA load current. LDO
ground pin current is only 80μA, making the
AAT2846 ideal for battery-operated applications.
The AAT2846 is equipped with built-in short-circuit
and over-temperature protection. The soft start cir-
cuitry prevents excessive inrush current at start-up
and mode transitions.
The AAT2846 is available in a Pb-free TQFN44-28
package and operates over the -40°C to +85°C
ambient temperature range.
Features
Input Voltage Range: 2.7V to 5.5V
Tri-Mode Charge Pump:
— Drives up to Six Backlight LEDs and Two
Flash LEDs
— 32 Programmable Backlight Current
Settings Ranging from 95μA to 30mA
— 16 Programmable Flash Current Settings
— Maximum Flash LED Current
Programmable using External Resistor
— 2MHz Switching Frequency
Two Linear Regulators:
— 200mA Output Current
— 200mV Dropout Voltage
— Output Voltage Adjustable from 1.2V to
V
BATTERY
— Output Auto-Discharge for Fast Shutdown
— Individual LDO Enable Inputs
Built-In Thermal Protection
Automatic Soft Start
-40°C to +85°C Temperature Range
TQFN44-28 Package
Applications
Camera-Enabled Mobile Devices
Digital Still Cameras
Multimedia Mobile Phones
Typical Application
C
1
1μF
C
2
1μF
C1+
IN
C1- C2+
C2-
V
OUT
OUT
BL1
BL2
BL3
BL4
BL5
BL6
FL1
FL2
ENS
ENABLE/SET
ENB
EN_LDOB
V
OUT
LDOA
R
2A
R
1A
OUTA
FBA
C
OUTA
V
OUT
LDOB
C
OUTB
R
2B
R
1B
OUTB
FBB
C
0.1μF
REF
V
BAT
AAT2846
R
280k
FSET
AGND
FEN
EN_FLASH
IN
CT
PGND
ENA
EN_LDOA
C
IN
4.7μF
C
T
0.1μF
C
2.2μF
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