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AAT2846_08 参数 Datasheet PDF下载

AAT2846_08图片预览
型号: AAT2846_08
PDF下载: 下载PDF文件 查看货源
内容描述: 高电流电荷泵,带有双LDO用于背光和闪光应用 [High Current Charge Pump with Dual LDO for Backlight and Flash Applications]
分类和应用:
文件页数/大小: 22 页 / 1412 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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PRODUCT DATASHEET
AAT2846
ChargePump
TM
High Current Charge Pump with Dual LDO for Backlight and Flash Applications
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9, 18
10
11
12
13
14
15
16
17
19
20
21
22
23
24
25
26
27
28
EP
Symbol
BL3
BL2
BL1
AGND
CT
REF
FBB
OUTB
IN
FBA
OUTA
C1-
C1+
OUT
ENB
C2+
C2-
PGND
ENS
FL2
FL1
FEN
FSET
BL6
BL5
ENA
BL4
Description
Backlight LED 3 current sink. BL3 controls the current through backlight LED 3. Connect the cathode of back-
light LED 3 to BL3. If not used, connect BL3 to OUT.
Backlight LED 2 current sink. BL2 controls the current through backlight LED 2. Connect the cathode of back-
light LED 2 to BL2. If not used, connect BL2 to OUT.
Backlight LED 1 current sink. BL1 controls the current through backlight LED 1. Connect the cathode of back-
light LED 1 to BL1. If not used, connect BL1 to OUT.
Analog ground. Connect AGND to PGND at a single point as close to the AAT2846 as possible.
Flash timer control capacitor input. Connect a capacitor from CT to AGND to set the
ash timer. A 100nF
capacitor sets the timer to 1 second.
Reference output. Bypass REF to AGND with a 0.1µF or larger ceramic capacitor.
Feedback input for LDO B. FBB measures the output voltage of LDO B. Connect a resistive voltage divider
from the output of LDO B to FBB. FBB feedback regulation voltage is 1.2V.
LDO B regulated voltage output. OUTB is the voltage output of LDO B. Bypass OUTB to AGND with a 2.2µF or
larger ceramic capacitor as close to the AAT2846 as possible.
Power input. Connect IN to the input source voltage. Bypass IN to PGND with a 4.7µF or larger ceramic
capacitor as close to the AAT2846 as possible.
Feedback input for LDO A. FBA measures the output voltage of LDO A. Connect a resistive voltage divider
from the output of LDO A to FBA. FBA feedback regulation voltage is 1.2V.
LDO A regulated voltage output. OUTA is the voltage output of LDO A. Bypass OUTA to AGND with a 2.2µF or
larger ceramic capacitor as close to the AAT2846 as possible.
Negative node of charge pump capacitor 1. Connect the 1µF charge pump capacitor 1 from C1+ to C1-.
Positive node of charge pump capacitor 1. Connect the 1µF charge pump capacitor 1 from C1+ to C1-.
Charge pump output; supplies current to the backlight and
ash LEDs. Connect the backlight and
ash LED an-
odes to OUT. Bypass OUT to PGND with a 2.2µF or larger ceramic capacitor as close to the AAT2846 as possible.
LDO B enable input. ENB turns on or off low dropout regulator B (LDO B). Drive ENB high to turn on LDO B;
drive it low to turn it off.
Positive node of charge pump capacitor 2. Connect the 1µF charge pump capacitor 2 from C2+ to C2-.
Negative node of charge pump capacitor 2. Connect the 1µF charge pump capacitor 2 from C2+ to C2-.
Power ground. Connect AGND to PGND at a single point as close to the AAT2846 as possible.
Flash and backlight enable and serial control input. ENS turns on/off both the
ash and backlight and is the
AS
2
Cwire input to serially control the backlight and movie-mode
ash LED brightness.
Flash LED 2 current sink. FL2 controls the current through
ash LED 2. Connect the cathode of
ash LED 2 to
FL2. If not used, connect FL2 to OUT.
Flash LED 1 current sink. FL1 controls the current through
ash LED 1. Connect the cathode of
ash LED 1 to
FL1. If not used, connect FL1 to OUT.
Flash enable input. FEN is the on/off control for the
ash LEDs. Drive FEN high to drive the maximum
ash
current, set by RFSET, through the
ash LEDs.
Flash current setting input. A 280kΩ resistor from FSET to AGND sets the maximum
ash LED current.
Backlight LED 6 current sink. BL6 controls the current through backlight LED 6. Connect the cathode of back-
light LED 6 to BL6. If not used, connect BL6 to OUT.
Backlight LED 5 current sink. BL5 controls the current through backlight LED 5. Connect the cathode of back-
light LED 5 to BL5. If not used, connect BL5 to OUT.
LDO A enable input. ENA turns on or off low dropout regulator A (LDO A). Drive ENA high to turn on LDO A;
drive low to turn it off.
Backlight LED 4 current sink. BL4 controls the current through backlight LED 4. Connect the cathode of back-
light LED 4 to BL4. If not used, connect BL4 to OUT.
Exposed paddle (bottom); connect to ground as closely as possible to the device.
2
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2846.2008.03.1.1