CURRENT REGULATOR. A708 Datasheet

A708 REGULATOR. Datasheet pdf. Equivalent

Part A708
Description 3 CHANNELS 20mA ADVANCED CURRENT REGULATOR
Feature www.DataSheet4U.com A708 www.addmtek.com DESCRIPTION The A708 is a 3 channels 20mA advanced current.
Manufacture ADDtek
Datasheet
Download A708 Datasheet



A708
www.DataSheet4U.com
www.addmtek.com
A708
3 CHANNELS 20mA
ADVANCED CURRENT REGULATOR
DESCRIPTION
The A708 is a 3 channels 20mA advanced current
regulator for driving LEDs. Only bypass capacitor is
required and the noise is very low. The special circuit
design provides over 90% efficiency because of the very
low dropout voltage.
Target end applications are LED backlights for color
LCD display, such as mobile phone, smart phone, PDA,
notebook, and monitor, etc.
FEATURES
„ Fixed 20mA DC constant sink current.
„ Individual current sink circuit for each LED
string to prevent short / open circuit on LEDs.
„ TSOT-26 package available.
„ High efficiency.
„ Supply voltage range 2.7V ~ 12V.
„ Output sustaining voltage up to 17V.
„ 0.1uA standby current.
„ 2KV HBM ESD protection.
„ Advanced Bi-CMOS process.
TYPICAL APPLICATION CIRCUIT
VLED+
CBP
APPLICATIONS
„ Small Size Color LCD Backlights.
„ Mobile Phone, Smart Phone.
„ LED Backlight for Portable DVD, NB, Monitors,
and UMPC.
PACKAGE PIN OUT
VDD
CIN
Enable
LED1 LED2 LED3
VDD
A708
EN
GND
VDD 1
GND 2
EN 3
6 LED1
5 LED2
4 LED3
A708
TSOT-26
TA (°C)
-40 ~ 85
Y
ORDER INFORMATION
Plastic TSOT-26
6-pin
A708YFT
Note: The letter ”F” is marked for Lead Free process, and letter “T” is marked for Tape & Reel.
Copyright © 2007 ADDtek Corp.
1
DD076_A -- AUGUST 2007



A708
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VDD
Output Sustaining Voltage, VLEDn
Voltage at all other pins
Maximum Junction Temperature, TJ
Storage Temperature Range
Lead Temperature (soldering, 10 seconds)
(Note)
Note:
Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.
Currents are positive into, negative out of the specified terminal.
A708
-0.3V to 13.2V
-0.3V to 17V
-0.3V to 12V
150OC
-40OC to 150°C
260OC
Package
Y
POWER DISSIPATION TABLE
θJA Derating factor ( mW/°C )
TA25°C
TA=70 °C
TA= 85°C
(°C / W )
TA25 OC
Power rating (mW) Power rating (mW) Power rating (mW)
220 4.5
568 363 295
Note :
Junction Temperature Calculation: TJ = TA+ (PD x θJA).
PD: Power Dissipation, TA: Ambient temperature, θJA: Thermal Resistance-Junction to Ambient
The θJA numbers are guidelines for the thermal performance of the device/PC-board system.
All of the above assume no ambient airflow.
BLOCK DIAGRAM
VDD
EN
VDDI
Control
Logic
Reference
Current
A708
Driving
Stage
Driving
Stage
Driving
Stage
LED1
LED2
LED3
GND
Copyright © 2007 ADDtek Corp. 2 DD076_A -- AUGUST 2007





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