AK7864A Datasheet, PDF (1/13 Pages) Asahi Kasei Microsystems – 3 channel LED driver with Charge Pump

[AK7864A]
AK7864A
3 channel LED driver with Charge Pump
Device Outline
This product includes the charge pump power supply and 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 suitable for the LED drive for the CIS sensor.
Features
■ Operating Voltage
■ Operating Temperature Range
■ LED Driver Current
■ Current Accuracy
■ LED Current Rise / Fall iime
■ Charge Pump Pressor Circuit
■ Package
■ Power Supply
■ Application
3.3V±5%
0 ~ 70 C
RED: 66mA
GREEN: 66mA
BLUE: 66mA
The LED current is adjustable from 22mA to 66mA by the
external resistor. In addition, the LED current can be
reduced to 100%~12.5% by the register.
Allowable maximum Vf of the LED is 4.8V. The 1/16 watt
type is usable to external resistor.
 3 chnnel independently ON/OFF
(50% setting is an upper bound when 3ch becoming
turning on at the same time)
 Current setting in eight steps
When the external resistance value becomes the
assumption outside, a internal protection circuit restricts the
LED current equal to or less than 150mA (-30%~+45%)
±9.1%（by ideal resistance）
10s (typ.) (10% ~ 90%)
Generate the necessary voltage for the LED （Vf max 4.8V）
16pin QFN 3mm3mm, 0.75mm thickness with radiation
TAB in solderside
VDD 3.135 ~ 3.465V
A light source driver for CIS module of MFP
MS1336 - E - 00
1
2012/01