DATASHEET ISL97671A FN7709 Rev.4.00 2 6-Channel SMBus/I C or PWM Dimming LED Driver with Phase Shift Control Sep 14, 2017 The ISL97671A is a 6-Channel 45V dual dimming capable LED Features 2 driver that can be used with either SMBus/I C or PWM signal 6 x 50mA channels for dimming control. The ISL97671A can drive six channels of LEDs from an input of 4.5V~26.5V to an output of up to 45V. It 4.5V to 26.5V input with 45V maximum output can also operate from an input as low as 3V to an output of up 3V (see Figure 38 on page 26) to 21V input with 26.5V to 26.5V in bootstrap configuration (refer to Figure 38 on maximum output page 26). PWM dimming with phase shift control The ISL97671A features optional channel phase shift control 2 SMBus/I C controlled PWM or DC dimming to minimize the input/output ripple characteristics, and load transients to improve efficiency and eliminate audible noise. Direct PWM dimming PWM dimming linearity The device can also be configured for Direct PWM Dimming with a minimum dimming duty cycle of 0.007% at 200Hz. - PWM dimming with adjustable dimming frequency and duty cycle linear from 0.4% to 100% <30kHz The ISL97671A headroom control circuit monitors the highest LED forward voltage string for output regulation, to minimize - Direct PWM dimming duty cycle linear from 0.007% to the voltage headroom and power loss in a typical multi-string 100% at 200Hz operation. Current matching 0.7% The ISL97671A is offered in a compact and thermally efficient 600kHz/1.2MHz selectable switching frequency 20 Ld QFN 4mmx3mm package. Dynamic headroom control Related Literature Fault protection - String open/short-circuit, OVP, OTP, and optional output For a full list of related documents, visit our website short-circuit fault protection - ISL97671A product page 20 Ld 4mmx3mm QFN package Applications Tablet PC to notebook displays LED backlighting LCD monitor LED backlighting Field sequential RGB LED backlighting Typical Application Circuits 45V*, 6 x 50mA 45V*, 6 x 50mA 45V*, 6 x 50mA VIN = 4.5~26.5V VIN = 4.5~26.5V VIN = 4.5~26.5V Q1 (OPTIONAL) Q1 (OPTIONAL) Q1 (OPTIONAL) ISL97671A ISL97671A ISL97671A 1 FAULT 1 FAULT 1 FAULT LX 20 LX 20 LX 20 2 2 VIN 2 VIN VIN OVP OVP 16 OVP 16 16 4 4 4 VDC VDC VDC 8 FPWM PGND 19 PGND 19 PGND 19 7 7 7 SMBCLK/SCL SMBCLK/SCL SMBCLK/SCL CH0 10 CH0 10 CH0 10 6 SMBDAT/SDA 6 6 SMBDAT/SDA SMBDAT/SDA CH1 11 CH1 CH1 11 11 5 PWM 5 5 PWM PWM CH2 12 CH2 12 CH2 12 3 EN 3 EN 3 EN CH3 13 CH3 CH3 13 13 17 RSET CH4 14 17 CH4 17 CH4 14 RSET 14 RSET CH5 15 CH5 8 CH5 15 8 15 FPWM FPWM *VIN > 12V COMP *VIN > 12V 9 18 AGND COMP 9 COMP 18 *VIN > 12V 9 18 AGND AGND 2 FIGURE 1B. PWM DIMMING WITH PWM INPUT FIGURE 1C. DIRECT PWM DIMMING FIGURE 1A. SMBus/I C CONTROLLED AND ADJUSTABLE DIMMING DIMMING AND ADJUSTABLE FREQUENCY DIMMING FREQUENCY FIGURE 1. ISL97671A TYPICAL APPLICATION DIAGRAMS FN7709 Rev.4.00 Page 1 of 28 Sep 14, 2017ISL97671A Table of Contents Typical Application Circuits . 1 Block Diagram 3 Ordering Information 4 Pin Configuration 4 Pin Descriptions . 4 Absolute Maximum Ratings 5 Thermal Information . 5 Operating Conditions 5 Electrical Specifications . 5 Typical Performance Curves 8 Theory of Operation . 11 PWM Boost Converter 11 Enable . 11 Current Matching and Current Accuracy . 11 Dynamic Headroom Control . 11 PWM Dimming Frequency Adjustment 12 Phase Shift Control 12 Switching Frequency . 13 5V Low Dropout Regulator 13 IC Protection Features and Fault Management . 13 2 C Communications . 18 SMBus/I Write Byte 18 Read Byte 18 Slave Device Address . 18 2 SMBus/I C Register Definitions 18 PWM Brightness Control Register (0x00) 20 Device Control Register (0x01) 20 Fault/Status Register (0x02) 21 Identification Register (0x03) . 22 DC Brightness Control Register (0x07) 22 Configuration Register (0x08) . 23 Output Channel Mask/Fault Readout Register (0x09) . 23 Phase Shift Control Register (0x0A) 24 Component Selections 24 Input Capacitor 24 Inductor 24 Output Capacitors . 25 Output Ripple . 25 Schottky Diode 25 Applications . 25 High-Current Applications . 25 Low Voltage Operations 25 16-Bit Dimming . 26 Field Sequential RGB LED Backlighting . 26 Revision History 27 About Intersil 27 Package Outline Drawing 28 FN7709 Rev.4.00 Page 2 of 28 Sep 14, 2017