Features
- 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)
Description
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.
Parameters
| Attributes | Value |
|---|---|
| Internal Oscillator | No |
| Power-Down | No |
| Qualification Level | Standard |
| Temp. Range (°C) | 0 to +70°C |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| QFN | 5.0 x 4.0 x 0.90 | 28 | 0.5 |
Applications
- LED-Based Pico Projector In Mobile Phones
- Stand Alone Pico Projectors
- Tri-Stimulus Display Drivers
- Other Handheld Display Drivers
Support Communities
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ISL97901 burning ICs
hello. hope you had a nice time. I am using ISL97901 on my PCB. the problem is the IC gets hot and after a while some of its LEDs (e.g. LED 1 &3) do not work and switch well. also, the waveform of the LEDs are not square ...
Mar 16, 2024 -
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 -
ISL97901 Enable
hi, A few questions, thank you.1. ISL97901 can use the hardware method to enable EN1~EN3 continuously (always output), and then use the I2C Reg command to individually control the current output of led1~led3, can it?2.If any channel is disabled (maybe EN1 or EN2 or EN3 ...
Oct 29, 2020
Knowledge Base
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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
Support Communities
