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
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.
Parameters
| Attributes | Value |
|---|---|
| Topology [Rail 1] | Buck |
| Outputs (#) | 2 |
| Switching Frequency Range (Typical) (kHz) | 200 - 200 |
| SYNCH Capability | No |
| Parallelable | No |
| Bi-direction | No |
| Temp. Range (°C) | -40 to +125°C |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| WFQFN | 5.0 x 5.0 x 0.85 | 32 | 0.5 |
Application Block Diagrams
 | Advanced Automotive Domain Controller (AADC) Advanced Automotive Domain Controller integrates key systems for smarter and connected vehicles. |
Additional Applications
- Automotive battery supplied application
- In cabin systems
- ADAS: Advanced Driver Assist Systems
- Start-stop protected systems (such as head unit, cluster, e-Mirror)
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Renesas Boards & Kits
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... Read More
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... Read More
Knowledge Base
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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 -
Can ISL78263 or ISL78264 Support Inductor Current Higher than 10A?
Yes. When adjusting either channel's maximum load current, it is advised to rescale the power stage components, including MOSFETs, inductor, current sensing resistor, and output capacitance.
Aug 5, 2020 -
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
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