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AAT3122ITP-T1
EEWorld咨询电话：82357002，82350740－8068 邮件咨询：datasheet@eeworld.com.cn 器件描述：High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications 器件厂商：ANALOGICTECH [Advanced Analogic Technologies] 厂商主页：http://www.analogictech.com/ 文件大小：319.66KB 文件页数：12 PDF阅读：AAT3122ITP-T1.pdf (点击阅读器件资料) 摘要： AAT3122 High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications 3122.2004.08.1.2 1 ChargePump ? General Description The AAT3122 is a low noise, constant frequency charge pump DC/DC converter that uses a dual mode Load Switch (1X) and fractional (1.5X) con- version to increase efficiency in White LED appli- cations. With input voltages ranging from 2.7-5.5 Volts, the device can produce an output current of up to 120mA. A low external parts count (two 1?F flying capacitors and two small bypass capacitors at V IN and OUT) makes the AAT3122 ideally suited for small battery-powered applications. AnalogicTech?'s Simple Serial Control? (S 2 Cwire?) interface is used to enable, disable and set the LED drive current with a 32 level loga- rithmic scale LED brightness control. The AAT3122 has a thermal management system to protect the device in the event of a short circuit condition on any of the output pins. Built-in soft-start circuitry prevents excessive inrush current during start-up. High switching frequency enables the use of small external capacitors. A low shutdown current feature disconnects the load from V IN and reduces quies- cent current to less than 1?A. The AAT3122 pro- vides a single current source output that can be used to drive up to 6 LEDs at 20mA each. The AAT3122 is available in a TSOPJW-12 package. Features ?V IN Range: 2.7V to 5.5V ? <1?A of Shutdown Current ? 1 MHz Switching Frequency ? Dual Mode 1x and 1.5x Charge Pump for Maximum Efficiency ? Only 4 External components ? Simple Serial Control? (S 2 Cwire) Interface ? Low Noise Constant Frequency Operation ? 33% Less Input Current Than Doubler Charge Pumps ? Small Application Circuit ? Regulated Output Current ? Automatic Soft-Start ? No Inductors ? TSOPJW-12 Package ? -40 to +85C° Temperature Range Applications ? White LED Backlighting ? Programmable Current Source Typical Application C IN 1?F V BATTERY C OUT 1?F EN/SET C1 1?F C2 1?F D1 V IN V OUT C1+ C1- C2+ C2- DEN/SET GND AAT3122 D2 D3 D4 D5 D6 相关器件：AAT3122

AAT3122ITP-T1

EEWorld咨询电话：82357002，82350740－8068 邮件咨询：datasheet@eeworld.com.cn

器件描述：High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications
器件厂商：ANALOGICTECH [Advanced Analogic Technologies]
厂商主页：http://www.analogictech.com/
文件大小：319.66KB
文件页数：12
PDF阅读：AAT3122ITP-T1.pdf (点击阅读器件资料)

摘要：
AAT3122
High Efficiency 1X/1.5X Fractional Charge
Pump for White LED Applications
3122.2004.08.1.2 1
ChargePump
?
General Description
The AAT3122 is a low noise, constant frequency
charge pump DC/DC converter that uses a dual
mode Load Switch (1X) and fractional (1.5X) con-
version to increase efficiency in White LED appli-
cations. With input voltages ranging from 2.7-5.5
Volts, the device can produce an output current of
up to 120mA. A low external parts count (two 1?F
flying capacitors and two small bypass capacitors
at V
IN
and OUT) makes the AAT3122 ideally suited
for small battery-powered applications.
AnalogicTech?'s Simple Serial Control?
(S
2
Cwire?) interface is used to enable, disable
and set the LED drive current with a 32 level loga-
rithmic scale LED brightness control. The AAT3122
has a thermal management system to protect the
device in the event of a short circuit condition on
any of the output pins. Built-in soft-start circuitry
prevents excessive inrush current during start-up.
High switching frequency enables the use of small
external capacitors. A low shutdown current feature
disconnects the load from V
IN
and reduces quies-
cent current to less than 1?A. The AAT3122 pro-
vides a single current source output that can be
used to drive up to 6 LEDs at 20mA each. The
AAT3122 is available in a TSOPJW-12 package.
Features
?V
IN
Range: 2.7V to 5.5V
? <1?A of Shutdown Current
? 1 MHz Switching Frequency
? Dual Mode 1x and 1.5x Charge Pump for
Maximum Efficiency
? Only 4 External components
? Simple Serial Control? (S
2
Cwire) Interface
? Low Noise Constant Frequency Operation
? 33% Less Input Current Than Doubler Charge
Pumps
? Small Application Circuit
? Regulated Output Current
? Automatic Soft-Start
? No Inductors
? TSOPJW-12 Package
? -40 to +85C° Temperature Range
Applications
? White LED Backlighting
? Programmable Current Source
Typical Application
C
IN
1?F
V
BATTERY
C
OUT
1?F
EN/SET
C1
1?F
C2
1?F
D1
V
IN
V
OUT
C1+
C1-
C2+
C2-
DEN/SET
GND
AAT3122
D2 D3 D4 D5 D6

相关器件：AAT3122

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