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A708 Schematic ( PDF Datasheet ) - ADDtek

Teilenummer A708
Beschreibung 3 CHANNELS 20mA ADVANCED CURRENT REGULATOR
Hersteller ADDtek
Logo ADDtek Logo 




Gesamt 8 Seiten
A708 Datasheet, Funktion
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 Datasheet, Funktion
www.DataSheet4U.com
Li-ion Battery Voltage Supply
A708
The A708 can work with Li-ion battery. The supply voltage of Li-ion battery ranges from 4.5V down to lower
than 3V while the white/blue LED forward voltage (VF) is in the range of 2.9V to 3.5V at 20mA current. The supply
voltage range and LED forward voltage can be set to fully utilize Li-ion battery energy. For example, if the forward
voltage of white LED is 3.2V at 20mA, the Li-ion battery can discharge until output voltage reaches 3.275V (normally
around 1% ~ 3% power left in the battery). When Li-ion battery voltage is lower than the 3.275V, the LED current
(brightness) will start to decrease.
VDD
Li-ion
Battery
Enable
LED1 LED2 LED3
VDD
EN
A708
GND
Copyright © 2007 ADDtek Corp. 6 DD076_A -- AUGUST 2007

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