Overview
Description
The ISL73846M is a radiation tolerant double-ended PWM controller with synchronous rectification, designed for high-frequency switching power supplies in both voltage mode and current mode control configurations.
It features independent supply rails for the control circuitry and driver output stage. The driver stage supply is configurable from 4.5V to 20V, enabling direct drive of GaN FETs or MOSFETs for maximum design flexibility.
The ISL73846M supports current sharing and synchronization to either an internal or external clock. It natively enables two-phase operation without additional ICs, while higher phase counts can be achieved using the ISL74420M.
For greater design flexibility, the ISL73846M allows engineers to utilize the internal error amplifier or configure it as a buffer for use with an external error amplifier, enabling custom feedback loops.
The ISL73846M is available in a 64-lead EP-TQFP package and is fully specified across a temperature range of -55°C to +125°C.
Features
- Flexible Power Supply Options
- VDD supply range: 4.5V to 19V
- Independent driver supply: 4.5V to 19V
- Advanced Control and Protections
- Programmable switching frequency: 20kHz to 2MHz
- Supports internal or external clock synchronization
- Internal frequency accuracy: ±5%
- 8MHz GBWP error amplifier with support for an external error amplifier
- Programmable undervoltage lockout (UVLO)
- Selectable maximum duty cycle modes:
- 50% (Out of phase)
- 100% (Complementary)
- 100% (In phase)
- Radiation Assurance and High-Reliability Design
- Qualified to Renesas Rad Tolerant Screening and QCI Flow (R34TB0004EU)
- TID Radiation Lot Acceptance Testing (RLAT) (LDR: ≤10mrad(Si)/s)
- ISL73846M30NEZ: 30krad(Si)
- ISL73846M50NEZ: 50krad(Si)
- Single Event Effects (SEE) Performance
- No DSEE for VDD = 26.2V, PVDD = 19V at 46MeV•cm²/mg
- SEFI < 2.5µm²
- SET < 2% on VOUT at 46MeV•cm²/mg
Comparison
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 3.10 MB | |
| Technical Brief | PDF 356 KB | |
| Application Note | PDF 224 KB | |
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Design & Development
Boards & Kits
Evaluation
ISL73846MEV1Z
Active
Radiation Tolerant 28V to 12V, 144W Output Push-Pull Converter Evaluation Board
The ISL73846MEV1Z is an evaluation platform for a radiation tolerant push-pull power supply, built around the ISL73846M PWM controller. It converts a nominal 28V input (20V to 36V range) to a regulated 12V output, capable of delivering up to 12A continuous load current, and is optimized for...
Recommended Documents:
Evaluation
ISL73846MEV2Z
Active
Radiation Tolerant 28V to 5V, 50W Output Forward Converter Evaluation Board
The ISL73846MEV2Z is an evaluation platform designed to demonstrate the performance of the ISL73846M radiation tolerant PWM controller in a single-switch forward converter topology. The design features a demagnetizing winding for transformer reset and an auxiliary winding to generate the VDD...
Recommended Documents:
Evaluation
ISL73846MEV3Z
Active
Radiation Tolerant 12V to 28V, 112W Output Dual-Phase Boost Converter Evaluation Board
The ISL73846MEV3Z is an evaluation platform for a two-phase synchronous boost converter, featuring a leader-follower configuration using two ISL73846M radiation-tolerant PWM controllers. Designed for high-reliability applications, the converter steps up a nominal 12V input (10.8V to 13.2V range)...
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Models
ECAD Models
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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