特性
- 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
描述
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.
产品参数
| 属性 | 值 |
|---|---|
| Outputs (#) | 2 |
| Topology [Rail 1] | Buck |
| Input Voltage (Min) [Rail 1] (V) | 3.75 |
| Input Voltage (Max) [Rail 1] | 42 |
| Output Voltage (Min) [Rail 1] (V) | 0.8 |
| Output Voltage (Max) [Rail 1] (V) | 5 |
| Output Current (Max) [Rail 1] (A) | 20 |
| Switching Frequency Range (Typical) (kHz) | 200 - 2200 |
| Qualification Level | Automotive |
| Temp. Range (°C) | -40 to +125°C |
| Simulation Model Available | No |
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
 | 座椅控制器单元 先进的汽车座椅系统具有集成式智能控制和可扩展的模块化设计，可实现更高的舒适度、安全性和个性化程度。 |
 | 带 AHL 控制通道的汽车摄像头系统 汽车 AHL 摄像头系统，具有单电缆视频传输和控制功能，以及 I2C 鼓风机控制。 |
 | 带 AHL 摄像头的泊车辅助系统 具有高清模拟链路的汽车泊车摄像头系统降低了布线成本并保持零延迟。 |
 | 低成本数字汽车仪表集群 低成本数字集群和 HVAC 显示设计，具有可扩展的图形和快速启动支持。 |
其他应用
- Automotive 12V Systems
- Infotainment/Multimedia Systems
- Cockpit safety systems
- Advanced Driver Assist Systems (ADAS)