EEWorld咨询电话：82357002，82350740－8068 邮件咨询：datasheet@eeworld.com.cn
器件描述：High Efficiency 1.5X Fractional Charge Pumps For White LED Applications
器件厂商：ANALOGICTECH [Advanced Analogic Technologies]
厂商主页：http://www.analogictech.com/
文件大小：232.59KB
文件页数：14
PDF阅读：AAT3114ISN-20-T1.pdf (点击阅读器件资料)
摘要：
AAT3113/4
High Efficiency 1.5X Fractional Charge
Pumps For White LED Applications
Typical Application
C
IN
1?F
V
BATTERY
C
OUT
1?F
EN/SET
C1
1?F
C2
1?F
D4 D3 D2 D1
V
IN
V
OUT
C1+
C1-
C2+
C2-
D1
D2
D3
D4
EN/SET
GND
AAT3114
D5
D6
D5D6
3113.2004.07.1.4 1
ChargePump
?
General Description
The AAT3113/4 are low noise, constant frequency
charge pump DC/DC converters that use fractional
(1.5X) conversion to increase efficiency in White
LED applications. The devices can be used to pro-
duce current levels up to 20mA for each output from
a 2.7V to 5.5V input. Low external parts counts (two
1?F flying capacitors and two small bypass capaci-
tors at V
IN
, and OUT) make the AAT3113/4 ideally
suited for small battery-power applications.
AnalogicTech?’s Simple Serial Control?
(S
2
Cwire?) interface is used to enable, disable
and set the LED drive current for a 32 level loga-
rithmic scale LED brightness control. The
AAT3113/4 have 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 current
shutdown feature disconnects the load from V
IN
and reduces quiescent current to less than 1?A.
The AAT3113 provides 4 LED current source out-
puts, and the AAT3114 provides 6. The AAT3113/4
are available in 16-pin quad QFN packages, and
the AAT3113 is also available in the 12-pin
TSOPJW package.
Features
? White LED Backlighting
? AAT3113 - 4 Outputs
? AAT3114 - 6 Outputs
? 20mA Full Scale Current
? 32 Position Logarithmic Scale with Digital
Control
? Simple Serial Control? (S
2
Cwire?) interface
? Low Noise Constant Frequency Operation
? 33% Less Input Current Than Doubler
Charge Pump
? High Accuracy Brightness Matching
? Small Application Circuit
? Regulated Output Current
? Automatic Soft-Start
? VIN Range: 2.7V to 5.5V
? No Inductors
? 600kHz Switching Frequency
? Iq < 1?A in Shutdown
? Temperature Range -40 to 85°C.
? 16-Pin QFN, 12-Pin TSOPJW Package
Applications
? White LED Backlighting
? Programmable Current Source
相关器件：AAT3113ITP-20-T1 AAT3113ISN-20-T1 AAT3113
|
