Overview
Description
The ISL78264 is a dual buck controller that can operate across a wide VIN range of 3.75V to 42V. It is designed to support wide duty-cycle operation for switching frequencies from 200kHz up to 2.2MHz. To mitigate EMI, it supports synchronization to an external clock or programmable spread spectrum clocking. Its current-mode modulator is ideally suited to tolerate severe line transients. Also, the ISL78264 supports dropout operation and low 25ns on-time to operate through automotive cranking and load dump pulses.
The ISL78264 integrates robust MOSFET drivers and readily supports step-down applications requiring high output currents in normal operation. For applications that must also sustain extremely low power, always-on operation, its energy conservation mode can reduce operating current to 6µA. Integrated feedback for VOUT1 is provided for 3.3V or 5V applications to eliminate the current otherwise flowing in external feedback resistors. An automatic switchover to an external supply is also supported to maximize efficiency. A blocking diode is activated after startup to prevent the external supply from back-biasing a low input voltage at VIN.
The ISL78264 is qualified to AEC-Q100 Grade 1, specified to operate across an ambient temperature range of -40 °C to 125 °C, and is available in a 5mm x 5mm, 32 Ld WFQFN (Wettable Flank) package.
Features
- VIN operating range: 3.75V to 42V
- Low quiescent current: 6µA typical, one channel
- Switching frequency: 200kHz to 2.2MHz
- Dropout mode for high duty-cycle operation
- 25ns on-times for low duty-cycle operation
- External synchronization
- Programmable spread spectrum clocking
- 180° phase shift between channels
- 2A Sourcing/3A sinking MOSFET drivers
- Boot UVLO and programmable boot refresh time
- Extensive protection mechanisms for OV/UV/OC/OT
Comparison
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 1.99 MB | |
| Product Advisory | PDF 414 KB | |
| Product Change Notice | PDF 211 KB | |
| Manual - Development Tools | PDF 920 KB | |
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Design & Development
Boards & Kits
Evaluation
ISL78264EVAL1Z
Active
Automotive Dual Synchronous Buck Controller with Integrated Drivers Evaluation Board
The ISL78264EVAL1Z evaluation board is used to evaluate the two-channel synchronous buck converter operation of the ISL78264 dual buck controller in which the converters have a 180° phase shift to minimize input capacitor stress. The board demonstrates the high efficiency of synchronous buck...
Recommended Documents:
Evaluation
ISL78263EVAL1Z
Active
Automotive 42V Dual Synchronous Boost & Low-Iq Buck Controllers with Integrated Drivers Evaluation Board
The ISL78263EVAL1Z evaluation board is used to evaluate the dual-converter, synchronous buck-and-boost operation of the ISL78263 controller. The board evaluates Channel 1, a synchronous buck operation that provides a system rail voltage, and Channel 2, a boost converter that is activated to...
Recommended Documents:
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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