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器件描述：High Efficiency 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：220.38KB
文件页数：14
PDF阅读：AAT3132ITP-T1.pdf (点击阅读器件资料)
摘要：
AAT3132/32A
High Efficiency 1.5X Fractional Charge
Pump for White LED Applications
3132.2005.12.1.4 1
ChargePump
?
General Description
The AAT3132/32A is a low noise, constant frequen-
cy charge pump DC/DC converter that uses frac-
tional (1.5X) conversion to maximize efficiency for
white LED applications. The device can be used to
produce current levels up to 20mA in three of its out-
puts and up to 25 or 30mA in one of its outputs to
drive LEDs from a 2.7V to 5.5V input. Outputs may
be operated individually or paralleled for driving
higher-current LEDs. A low external parts count
(two 1?F flying capacitors and two small 1?F capac-
itors at V
IN
and OUT) makes the AAT3132/32A ide-
ally 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 in two groups: the three 20mA outputs
and the single 30mA output with multiple level loga-
rithmic scales. The AAT3132/32A has a thermal
management system to protect the device in the
event of a short-circuit condition at the output pin.
Built-in soft-start circuitry prevents excessive inrush
current during start-up. A high charge pump switch-
ing frequency enables the use of very small external
capacitors. A low-current shutdown feature discon-
nects the load from V
IN
and reduces quiescent cur-
rent to less than 1?A. The device also integrates a
test current/auto-disable feature for each channel.
The AAT3132/32A is available in the very small, Pb-
free, 12-pin TSOPJW package.
Features
?V
IN
Range: 2.7V to 5.5V
? <1.0?A of Shutdown Current
? 1MHz Switching Frequency
? White LED Backlighting
? Fully Independent Display Lighting
? Drives Low-V
F
and High-V
F
Type LEDs
? Up to Three 20mA Outputs
? Single 25mA Output (AAT3132-1)
? Single 30mA Output (AAT3132/32A)
? Multi-Position Logarithmic Scale with Digital
Control
? Low Noise Constant Frequency Operation
? Regulated Output Current
? Automatic Soft Start
? No Inductors
? -40°C to +85°C Temperature Range
? 12-Pin TSOPJW Package
Applications
? Color (RGB) Lighting
? Programmable Current Source
? White LED Backlighting
? White Photo Flash for Digital Still Cameras
Typical Application
C
IN
1?F
V
BATTERY
C
OUT
1?F
EN/SET
C1
1?F
C2
1?F
D5 D3 D2 D1
VIN
VOUT
C1+
C1-
C2+
C2-
D1
D2
D3
D4
EN/SET
GND
AAT3132
D4
相关器件：AAT3132A AAT3132ITP-1-T1 AAT3132AITP-1-T1 AAT3132
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