A708YFT ADDtek Corp, A708YFT Datasheet - Page 6

• Manufacturer Part Number: A708YFT
• Description: 3 Channels 20mA Advanced Current Regulator
• Manufacturer: ADDtek Corp

A708
Li-ion Battery Voltage Supply
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 (V
) is in the range of 2.9V to 3.5V at 20mA current. The supply
F
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.
V
DD
LED1
LED2
LED3
Li-ion
Battery
VDD
A708
EN
Enable
GND
Copyright © 2007 ADDtek Corp.
6
DD076_A -- AUGUST 2007