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Datasheet AT1312A PDF ( 特性, スペック, ピン接続図 )

部品番号 AT1312A
部品説明 High Efficiency Constant Current White-LEDs Driver
メーカ Aimtron Technology
ロゴ Aimtron Technology ロゴ 
プレビュー
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AT1312A Datasheet, AT1312A PDF,ピン配置, 機能
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AT1312A/B/C
Preliminary Product Information
High Efficiency, Constant Current
White-LEDs Driver
Feature
•Operating Voltage:2.5V to 6.0V.
•High Operating Frequency: 1MHz
•High Output Voltage: Up to 16V/23V/28V
•Shutdown Current <1µA
•16V/23V/28V Output Over-Voltage Protection
•Digital Dimming Control.
•Built-in Cycle-by Cycle Current-Limiting.
•Built-in Soft-Start Function.
•0.2V Low Reference Voltage
•Tiny SOT-26 Package
Application
Description
The AT1312A/B/C step-up converter drives white
LEDs with a constant current to provide backlight in
cell phones, PDAs, and other hand-held devices. It
features allowing series connection of the white
LEDs so that the LED currents are identical for
uniform brightness. An enable input can be pulsed
repeatedly to adjust LED’s brightness. The fast 1.0
MHz current-mode PWM control allows for smaller
capacitor and inductor. Fault condition protection
uses cycle-by-cycle current limiting to sense
maximum inductor current, thermal protection and
over-voltage protection. Also included soft-start
eliminates inrush current during start-up. The 0.2V
low reference voltage minimized the power loss
across the current-setting resistor.
• LED Module
• Compact Back Light Module
• Constant Current Source
The AT1312A/B/C is available in 6-pin SOT-26
packages.
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/23/2006 REV:1.1
Email: service@aimtron.com.tw
1

1 Page



AT1312A pdf, ピン配列
AT1312A/B/C
Preliminary Product Information
High Efficiency, Constant Current
White-LEDs Driver
Absolute Maximum Ratings*1
Parameter
Rated Value
Unit
VIN voltage
LX , OVP voltage
EN , FB to GND
Switch Current (ILX)
Continuous power dissipation (SOT-26 Ta=+25OC)
Operating Junction Temperature Range
Lead Temperature (Soldering 5 sec)
Storage Temperature
Package Thermal Resistance (ΘJA)
ESD Susceptibility*2
HBM
MM
-0.3 to +6.5
-0.3 to +28
-0.3 to +6.5
0.6
0.35
-30 to 85
260
-65 to 125
250
2
200
V
V
V
A
W
/W
KV
V
1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other
conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure
to absolute maximum rating conditions for extended periods may affect device reliability.
2. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF
capacitor discharged through a 1.5Kresistor into each pin.
Recommended Operation Conditions
Parameter
Power supply voltage
Operating temperature
Symbol
VIN
Top
Min.
Values
Typ.
Max.
Unit
2.5 6.0 V
-20 +25 +85
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/23/2006 REV:1.1
Email: service@aimtron.com.tw
3


3Pages


AT1312A 電子部品, 半導体
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AT1312A/B/C
Preliminary Product Information
High Efficiency, Constant Current
White-LEDs Driver
Efficiency vs. Vin (6 LED)
L:SR0302 D:RB501-40
34
Vin (V)
Io=10 m A, L =22u H
Io=10 m A, L =10u H
Io = 10 m A, L = 6.8u H
Io = 10 m A, L = 4.7u H
56
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72
70
2
Efficiency vs. Vin (4 LED)
L:SR0302 D:RB501-40
34
Vin (V)
Io=10 m A, L =22u H
Io=10 m A, L =10u H
Io = 10 m A,L = 6.8u H
Io = 10 m A,L = 4.7u H
56
Ch1:LX
Ch2:ILX
Ch3:Vo
Ch1:LX :10V/div , Ch2:ILX: 200mA/div, Ch3: Vo :100mV/div ,0.2uS/div
Switching Transient Waveform
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/23/2006 REV:1.1
Email: service@aimtron.com.tw
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