Datasheet

ISL97672A
6-Channel LED Driver with Ultra Low Dimming Capability

Overview
Parametrics
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Typical Diagram

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Key Features

6 x 50mA Channels
4.5V to 26.5V Input
45V Output Max
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
OVP
OTP
Optional Output Short-Circuit Fault Protection Switch

Current Matching ±0.7%
20 Ld 3x4 QFN Package

Description

The ISL97672A is an integrated power LED driver that controls six channels of LED current for LCD backlight applications. The ISL97672A is capable of driving LEDs from 4.5V to 26.5V, with a maximum output of 45V.

The ISL97672A employs an adaptive boost switching architecture that allows Direct PWM dimming with linearity as low as 0.007% at 200Hz or 0.8% at 20kHz. Dimming can be as high as 30kHz.

The ISL97672A can compensate for non-uniformity of forward voltage drops in the LED strings. Its headroom control circuit monitors the highest LED forward voltage string for output regulation to minimize voltage headroom and power loss in a typical multi-string operation. Typical current matching between channels is ±0.7%.

The ISL97672A features 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 a fault disconnect switch.

The ISL97672A is offered in a compact 20 Ld QFN 3x4 package and can operate in ambient temperatures of -40°C to +85°C.