[AK7864]

MS1152 - E - 01

1

2010/09

AK7864

3 channel LED driver with Charge Pump

Device Outline

This product is include the charge pump power supply and include the 3 channel LED driver who

drives the LED of the anode common in the constant current . The current to pass for each channel

can be adjusted by the external resistance and the register setting. Also, it has the control pins which

turn on or off the current. It is the best for the LED drive for the CIS sensor.

Features

■ Operation Voltage

3.3V±5%

■ Operating Temperature Range

0 ~ 70℃

■ LED driver current

RED: 66mA (Adjustment external resister:22 ~ 66mA)

GREEN: 66mA (Same as above, each channel is spec in

absolute value.)

BLUE: 66mA (Same as above, each channel is spec in

absolute value.)

Usable Vf MAX range of the LED is 4.8V. The resistance for

the current regulation is usable in 1/16W -type.

▪ 50% setting is an upper bound when 3ch becoming

turning on at the same time.

▪ 3ch independent ON/OFF.

▪ Current setting in eight steps

When the external resistance value becomes the

assumption outside, it has the protection circuit which

doesn't make the electric current which flows through the

LED equal to or more than 150mA（-30%～+45%）

■ Current Accuracy

±9.1%（by ideal resistance）

■ LED Current rise / fall time

10

μs (typ.) (10% ~ 90%)

■ Charge Pump pressor circuit

Generate the necessary voltage for the LED （Vf max 4.8V）

■ Package

16pinQFN 3mm, 0.75mm thickness with radiation TAB in

Solderside

■ Power

VDD 3.135 ~ 3.465V

■ Application

A light source driver for CIS module of MFP