ISL81843
Wide VIN 4.5V-80V dual synchronous buck controller with current sharing and PMBus interface for industrial and teleco...
Product Overview
Description
The ISL81843 is a flexible dual synchronous buck controller supporting wide input voltage from 4.5V to 80V.
It features current sharing capability for high current applications and includes PMBus interface for digital power management.
The device offers programmable switching frequency up to 1MHz and comprehensive protection features including overcurrent and overvoltage protection.
Product Series
ISL
Primary Application
Industrial power supplies
Key Features
- Wide 4.5V to 80V input voltage range
- Dual independent buck channels
- Current sharing for high current applications
- PMBus digital interface for monitoring and control
- Programmable switching frequency
- Comprehensive fault protection
- External soft-start and tracking
Specifications
| Input Voltage | 4.5V to 80V |
|---|---|
| Output Voltage | 0.6V to 54V |
| Output Current | Configurable (external FETs) |
| Switching Frequency | 100kHz to 1MHz |
| Efficiency | Up to 95% |
| Package | QFN-40 |
Applications
Industrial power supplies
Industrial automation and control
Telecom base stations
Electronic system design
Server and storage systems
Electronic system design
Battery-powered systems
Battery and charging management
Automotive systems
Automotive and EV electronics
FAE Expert Insights
"The ISL81843 is an excellent choice for industrial power applications requiring wide input voltage range. The 80V input capability handles harsh industrial environments with voltage transients. I've used this controller in telecom rectifier designs where the PMBus interface enabled remote monitoring and control. The current sharing feature allows paralleling outputs for high current applications. The external FET configuration provides flexibility in optimizing efficiency vs cost. The compensation is straightforward with voltage-mode control. For industrial power designs, this controller offers the right balance of features, performance, and cost."
Wide input range with digital PMBus control
— James Wilson, BeiLuo
Frequently Asked Questions
What is the maximum output current for ISL81843?
The ISL81843 is a controller that drives external MOSFETs, so output current depends on external component selection. With appropriate FETs and thermal design, each channel can support 20A or more. Current sharing allows paralleling channels for higher current. The controller provides current limit protection configurable through external sense resistor.
Select external FETs based on current, voltage, and thermal requirements. Contact us for power stage design assistance.