Overview
Description
The ISL78263 offers synchronous boost and buck controllers. The boost controller operates either as an independent channel or as a pre-boost function that supplies the buck controller. The low-IQ buck controller uses only 6µA quiescent current, allowing it to support low-power, always-on operation. Both controllers support wide duty-cycles for switching frequencies from 200kHz to 2.2MHz. Both devices can be synchronized to an external clock and offer programmable spread spectrum clocking to mitigate EMI.
In pre-boost buck mode, the boost of the ISL78263 can be set to activate during falling VIN transients and continues to operate with an input voltage down to 2.1V. This allows the buck output to maintain regulation, even as the VIN voltage falls below its output. To support the increase in input current that occurs when VIN falls, the ISL78263 integrates robust MOSFET drivers to allow the use of multiple FETs in parallel.
ISL78263 is qualified to AEC-Q100 Grade 1 and is specified to operate across an ambient temperature range of -40°C to 125°C. The device is available in a 5mm x 5mm, 32 Ld WFQFN (Wettable Flank) package. The features of the ISL78263 make it ideally suited as a front-end regulator for automotive systems that must maintain always-on operation and support severe cold-cranking transients.
Features
- VIN operating range: 2.1 to 42V
- Low quiescent current: 6µA typical, buck channel
- Switching frequency: 200kHz to 2.2MHz
- Boost frequency at 1x or 0.2x the buck frequency
- Dropout mode (buck) for high duty-cycle operation
- 25ns on-times for low duty-cycle operation
- External synchronization
- Programmable spread spectrum clocking
- 2A Sourcing/3A sinking MOSFET drivers
- Boot UV 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 1.82 MB | |
| Product Advisory | PDF 414 KB | |
| Product Change Notice | PDF 211 KB | |
| Manual - Development Tools | PDF 1.36 MB | |
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Design & Development
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FAQs
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Can Channel 1 of ISL78263 or ISL78264 be Set to a Voltage Higher Than 5V In Adjustable Mode?
Channel 1's current sense pins must be kept less than the absolute maximum rating of 6.5V. If an output voltage higher than 5V is desired, it must be ensured that the design incorporates sufficient margin to ensure that absolute maximum is not violated. Exceeding 5V may be possible ...
Aug 5, 2020 -
What Modulation Scheme is Used by ISL78263 and ISL78264?
They use hybrid current mode.
May 16, 2021 -
Does ISL78263 Ch2 BOOST Output Have Soft Start Ramp Up When Boost Turns ON In Cold-Crank Configuration?
No. The Ch2 BOOST output is allowed to rise as quickly as allowed by the power circuit components (primarily inductor) so that the circuit can respond quickly when the battery drops during cold-crank applications.
May 16, 2021