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AAT2845AIML-EE-T1 Datasheet

  • AAT2845AIML-EE-T1

  • Four-Channel Backlight Driver with Dual LDOs

  • 19頁

  • ANALOGICTECH

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AAT2845A
Four-Channel Backlight Driver with Dual LDOs
General Description
The AAT2845A is a highly integrated power solu-
tion for single-cell lithium-ion-based LCD display
applications. It includes a four-channel LED back-
light driver and two integrated 200mA LDOs as
additional power supplies for display and camera-
related chipsets.
The backlight driver is a low noise, constant fre-
quency charge pump DC/DC converter that uses a
tri-mode load switch (1X), fractional (1.5X), and
doubling (2X) conversion to maximize efficiency.
Each of the four channels is capable of driving up
to 20mA per channel.
AnalogicTech's S
2
Cwire鈩?(Simple Serial Control鈩?
serial digital input is used to enable, disable, and
set current for each LED with 16 available settings
down to 50碌A. The low current mode supply current
can be as low as 50碌A to save power and maintain
high efficiency.
Each LED output is equipped with built-in protec-
tion for short-circuit and auto-disable functions.
Built-in soft-start circuitry prevents excessive
inrush current during start-up. A low current shut-
down feature disconnects the load from V
IN
and
reduces quiescent current to less than 1碌A.
The AAT2845A is available in a Pb-free, thermally-
enhanced 20-pin 3x4mm TQFN package.
Features
鈥?/div>
鈥?/div>
ChargePump
鈩?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Input Voltage Range: 2.7V to 5.5V
Four-Channel LED Driver:
鈥?Tri-Mode Charge Pump
鈥?Up to 20mA/Channel
鈥?Easy Control with Single Wire Interface
鈥?16 Current Levels
鈥?Four Low Current Settings Down to 50碌A
鈥?Low I
Q
(50碌A) for Low Current Mode
鈥?>90% Peak Efficiency
Dual 200mA LDOs
Automatic Soft-Start
Over-Temperature Protection
Available in 3x4mm TQFN34-20 Package
-40擄C to +85擄C Temperature Range
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Camera Function Power Supplies
Camera Phone Displays
LCD Modules
White LED Backlighting
Typical Application
C1
1渭F
C1-
C2
1渭F
C2+
C1+ C2-
IN
V
BAT
3.6V
OUT
AAT2845A
C
IN
2.2渭F
C
OUT
1渭F
D1
D2
D3
D4
IN
LDOA
200mA
Co
1
FBA
S
2
Cwire Backlight Control
LDO Enable
C
BYP
0.1渭F
EN/SET
LDOB
ENLDO
CBP
GND
200mA
Co
2
FBB
2845A.2007.05.1.0
1

AAT2845AIML-EE-T1 產品屬性

  • 0現(xiàn)貨

  • 停產

  • -

  • 卷帶（TR）

  • 停產

  • DC DC 穩(wěn)壓器

  • 開關電容器（充電泵）

  • 是

  • 4

  • 2.7V

  • 5.5V

  • -

  • 20mA

  • 1MHz

  • -

  • 背光

  • -40°C ~ 85°C（TA）

  • 表面貼裝型

  • 20-WFQFN 裸露焊盤

  • 20-TQFN（3x4）

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