ISL97683

Compact 3-Ch LED Drivers with Phase Shift Control

OVERVIEW

The ISL97682, ISL97683, ISL97684 are Intersils highly integrated 2-3-4-channel LED drivers that are suitable for medium size TFT-LCD backlights. These parts can drive multiple channels of LEDs from inputs as low as 4V to outputs of up to 45V. They can also operate from inputs as low as 3V to outputs of up to 26.5V in bootstrap configuration.

The ISL97682, ISL97683, ISL97684 feature optional channels phase shift control. This feature is used to minimize the input, output ripple characteristics and load transient, which help eliminate or reduce the video and audio noise interference from the backlight driver operation.

The ISL97682, ISL97683, ISL97684 offer 8-bit PWM dimming for systems that need frequency tuning flexibility. With the unique adaptive boost switching architecture, the ISL97682, ISL97683, ISL97684 also offer Direct PWM dimming with output, which follows input and achieves linearity as low as 0.009% at 200Hz or 1.35% at 30kHz.

The drivers incorporate dynamic headroom control that monitors the highest LED forward voltage string and uses its feedback signal for the minimum output regulation. The ISL97682, ISL97683, ISL97684 incorporate extensive fault protection functions including string open and short circuit detections, OVP, and OTP. The switching frequency can be selected at either 600kHz or 1.0MHz in PFM or PWM mode. These parts are available in the thin and compact 16 Ld 3mmx3mm TQFN package and operate in ambient temperature from -40°C to +85°C.

KEY FEATURES

  • ISL97682 - 2 x 100mA Channels
  • ISL97683 - 3 x 50mA Channels
  • ISL97684 - 4 x 50mA Channels
  • Input Voltage 4.0V~26.5V with Max VOUT of 45V
  • Input Voltage 3.0V (see Figure 26) ~24V with Max VOUT of 26.5V
  • PWM Dimming Linearity
  • PWM Dimming with Adjustable Dimming Frequency with Duty Cycle Linear from 0.4% to 100% <30kHz
  • Direct PWM Dimming with Duty Cycle Linear from 0.009% to 100% at 200Hz
  • Current Matching of 0.7% typical from 1%~100% Dimming
  • Selectable 600kHz or 1MHz Switching Frequency in PWM/PFM Mode
  • Dynamic Headroom Control
  • Fault Protection
  • String Open/Short Circuit Protections, OVP, OTP
  • Thin and Compact TQFN-16 3mmx3mm Package

PARAMETRICS

Parameters
ISL97683
Basic Information
Production Status
Mass Production
# of Devices/ Channels
3
Total Current for DC/DC Lighting (mA)
150
Output Current Max/Channel (mA)
50
Output Voltage Max (V)
45
Brightness Control
Yes
Input Voltage Max (V)
26.5
Input Voltage Min (V)
4
Backlight for LCD Size (min) (in)
0
Backlight for LCD Size (max) (in)
17
Qualification Level
Standard
Peak Efficiency (%)
90.1
# of LEDs (max)
3-Channel 45V 50mA LED Driver
Frequency
1.0/0.6 MHz
IS (max)
5 mA
IQ (max)
5 µA
ISW (typ) (mA)
1800
Integrated Diode
No
Over Voltage Protection
Yes
Fault Switch
Yes
Topologies
Inductor Boost
Input Voltage Range (V)
4 to 26.5
Backlight for LCD Size
up to 17
Can Sample
YES
Temperature Range
-40 to +85

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