描述 Description

AW99706B is a highly accurate, highly matching six-string LCD backlighting power solution for notebook. It is a highly integrated step-up DC-DC converter operating with a wide input voltage for 2.7V to 24V and a temperature range from -40°C to 85°C.

AW99706B integrates a high voltage MOSFET and six high accuracy, high voltage current sinks. Each current sink can be regulated up to 50mA. The LED current can be adjusted via an I2C interface or through a PWM signal. The PWM dimming resolution is up to 12-bit.

AW99706B supports 300kHz to 1.7MHz switching frequency. Flexible selection of switching frequency according to efficiency and component size.

AW99706B provides 3 ramp control modes for smooth transform of backlight brightness. Soft start mode can only be chose during the process of turning on and off backlight. Fade in/out mode and slope mode can be chose during both turning on/off backlight and dimming transition.

Thorough protection features include over voltage limit, over temperature, over current protection, input undervoltage lockout, LED open and short detection. The protection status will be showed in register.

特性 Features

Wide Operating Input Voltage: 2.7V ~ 24V
High Output Voltage : Up to 40V
Channel Current Programmable: 5mA to 50mA
Channel Current Regulation with Accuracy ±2% and Matching ±1%
Dimming Controls
-Direct PWM Dimming up to 25kHz with Minimum 1% Duty (400ns)
-PWM to Analog up to 2kHz with 12-bit Resolution, up to 4kHz with 11-bit Resolution, up to 8kHz with 10-bit Resolution
-PWM to Mixed up to 2kHz with 12-bit Resolution, up to 4kHz with 11-bit Resolution, up to 8kHz with 10-bit Resolution
-PWM to Mixed-26K up 2kHz with 12-bit Resolution, up to 4kHz with 11-bit Resolution, up to 8kHz with 10-bit Resolution
I2C Programs LED Current, Switching Frequency 300kHz to 1.7MHz
Embedded Memory by MTP
Protections
-LED Strings Open and Short Detection
-Current Limit Protection
-Voltage Limit Protection
-Over-Temperature Protection
WBQFN 4mmX4mmX0.75mm-24L Package