特性
- 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
描述
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.
产品参数
| 属性 | 值 |
|---|---|
| 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 |
封装选项
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| WFQFN | 5.0 x 5.0 x 0.85 | 32 | 0.5 |
应用方框图
 | 高级汽车域控制器（AADC） 高级汽车域控制器集成了关键系统，可实现更智能、更互联的汽车。 |
其他应用
- 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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汽车级 42V 双同步升压和低 Iq 降压控制器评估板，带集成驱动器
ISL78263EVAL1Z 评估板用于评估 ISL78263 控制器的双转换器、同步降压和升压操作。 该评估板评估通道 1（提供系统轨电压的同步降压操作）和通道 2（启动以支持汽车冷起动应用的升压转换器）。 此外，ISL78263EVAL1Z 支持评估 ISL78263 功能，如过电流保护、过压和欠压保护，以及每个通道的功率良好指示器。
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... 阅读详情
