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ISL97901

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RGB Buck-Boost Four-Channel LED Driver with Color Sequencing and Automatic White Balance

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Overview

The ISL97901 is a highly efficient four channel, 1. 5A sequential LED driver powered from a single-cell Li-ion battery, or regulated input voltage up to 5. 5V. The ISL97901 incorporates an independent current controlled driving mechanism for each of the LEDs to allow accurate brightness control. The ISL97901 also utilizes a buck-boost converter to ensure optimum output voltage is maintained for a wide variety of LED forward voltages. The ISL97901's highly integrated and efficient power conversion core operates at well over 90% efficiency across a wide range of operating conditions. The power conversion core implements a proprietary algorithm that allows seamless transitions and glitch-free operation between the buck and the boost modes as the battery voltage drops during operation. The ISL97901 provides I/O pins to interface with Intersil's optical sensor IC's for white balance control. White balance is achieved by closing the opto-electrical loop which allows for LED light output to get calibrated against preset target values. The ISL97901 can also be configured to run in an open-loop manner if real-time white balance control is not desired. In this case, the LED currents are set by the internal registers.

ISL97901 Functional Diagram
ISL97901 Functional Diagram
  • Buck-Boost Based LED Driver
  • RGB, RGGB or RGBW Color Sequencing
  • Up to 1.5A Output Current
  • Photo Detector Feedback Interface
  • Dual Green LED Drive Support
  • Closed-Loop White Balancing Dynamic Current Scaling
  • Standby Current less than 70µA
  • I2C Interface
  • 150mV Feedback Voltage Reference for Current Regulation to Maximize Efficiency
  • 2.5MHz Switching Frequency
  • Programmable Output Voltage for each LED
  • Dynamic Headroom Management
  • Internal Current Setting Registers
  • Ambient Temperature Range: 0°C to +70°C
  • Pb-Free (RoHS Compliant)

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Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.

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  1. ISL97901 datasheet

    I've been trying to get the datasheet or at least the registers for the ISL97901. The request full datasheet option didn't work. I actually already have this part on our proto-boards and I'd just like to be able to check some registers settings. So what's ...

    Nov 16, 2023
  2. ISL97901 output voltage problem

    ... ISL_init(I2C_HandleTypeDef *hi2c) { Bus_Write(ISL97901_ENABLE_CONTROL, val_ENABLE_CONTROL , hi2c); Bus_Write(ISL97901_CLOCK_CONTROL, val_CLOCK_CONTROL , hi2c); Bus_Write(ISL97901_LED_R_LSB, val_LED_R_LSB , hi2c); Bus_Write(ISL97901_LED_G_LSB, val_LED_G_LSB , hi2c); Bus_Write(ISL97901_LED_B ...

    Oct 26, 2024
  3. How does Dynamic Headroom Management work on the ISL97901?

    Trying to understand how this feature works.  Does it reduce the output voltage (VOUT)? By the amount set in the Headroom Window (addr 05h)?  Does this register set the max limit for how much Auto Voltage Adjustment there can be?

    Jul 31, 2024
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FAQs

  1. Can I2C Interface to ISL97901 Be Operated With Pull-up Resistors Connected to 1.8 Volts?

    Yes, the I2C interface to the ISL97901 will operate with pull-up resistors connected to 1.8 volts.

    Feb 11, 2021