- 6 x 50mA channels
- 4.5V to 26.5V input
- 45V output maximum
- Adaptive boost switching architecture
- Direct PWM dimming with dimming linearity of 0.007%~100% at 200Hz or 0.8%~100% <20kHz
- Adjustable 200kHz to 1.4MHz switching frequency
- Dynamic headroom control
- Fault protections with latched flag indication
- String open/short-circuit
- Overvoltage Protection (OVP)
- Over-Temperature Protection (OTP)
- Optional output short-circuit fault protection switch
- Current matching ±0.7%
- 20 Ld 3x4 QFN package
The ISL97672B is an integrated 6-channel power LED driver for LCD backlight applications. The ISL97672B is capable of driving LEDs with an input from 4.5V to 26.5V and a maximum output up to 45V.
The ISL97672B employs an adaptive boost switching architecture that allows direct PWM dimming with dimming duty cycle as low as 0.007% at 200Hz or 0.8% at 20kHz. PWM Dimming frequency can be as high as 30kHz.
The ISL97672B employs the dynamic headroom control that monitors the highest LED forward voltage string for output regulation to minimize headroom voltage and power loss in a typical multi-string operation. Typical current matching between channels is ±0.7%.
The ISL97672B incorporates extensive protection functions that flag whenever a fault occurs. The protections include string-open and short-circuit detections, OVP, OTP and an optional output short-circuit protection with external fault disconnect switch.
The ISL97672B is offered in a compact 20 Ld QFN 3x4 package and can operate in ambient temperatures of -40°C to +85°C.
- Notebook displays LED backlighting
- LCD monitor LED backlighting
- Multi-function printer scanning light source
|# of Devices/ Channels||6||6||8||6|
|Total Current for DC/DC Lighting||300 mA||300 mA||400 mA||210 mA|
|Output Current Max/Channel||50 mA||50 mA||50 mA||35 mA|
|VOUT (max) (V)||45||45||45||34.5|
|VIN (max) (V)||26.5||26.5||26||24|
|VIN (min) (V)||4.5||4.5||4.75||6|
|Backlight for LCD Size (min)||0 in||0 in||0 in||0 in|
|Backlight for LCD Size (max)||17 in||17 in||17 in||17 in|
|Peak Efficiency (%)||92.9||92.9||93.4||91|
|# of LEDs (max)||78||78||96||60|
|Frequency||0.6/1.2 MHz||0.6/1.2 MHz||1.5 MHz||1.2 MHz|
|IS (max)||5 mA||5 mA||10 mA||10 mA|
|IQ (max)||5 µA||5 µA||5 µA||20 µA|
|ISW (typ)||2000 mA||2000 mA||3800 mA||2500 mA|
|Over Voltage Protection||Yes||Yes||Yes||Yes|
|Topologies||Inductor Boost||Inductor Boost||Inductor Boost||Inductor Boost|