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LM5163-Q1 同步降压转换器用于在宽输入电压范围内进行调节,从而最大限度地减少对外部浪涌抑制组件的需求。50ns 的最短可控导通时间有助于实现较大的降压比,支持从 48V 标称输入到低电压轨的直接降压转换,从而降低系统的复杂性并减少解决方案成本。LM5163-Q1 在输入电压突降至 6V 时,能够根据需要以接近 100% 的占空比工作,因此非常适合高性能 48V 电池汽车应用和 MHEV/EV 系统。
LM5163-Q1 具有集成式高侧和低侧功率 MOSFET,可提供高达 0.5A 的输出电流。恒定导通时间 (COT) 控制架构可提供几乎恒定的开关频率,具有出色的负载和线路瞬态响应。LM5163-Q1 的其他特性包括超低 IQ 和二极管仿真模式运行(可实现高轻负载效率)、创新的峰值和谷值过流保护、集成式 VCC 辅助电源和自举二极管、精密使能和输入 UVLO 以及具有自动恢复功能的热关断保护。开漏 PGOOD 指示器提供时序控制、故障报告和输出电压监视功能。
LM5163-Q1 符合汽车 AEC-Q100 1 级标准并采用 8 引脚 SO PowerPAD™ 封装。该器件的 1.27mm 引脚间距可以为高电压应用提供足够的间距。
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | GND | G | Ground connection for internal circuits |
2 | VIN | P/I | Regulator supply input pin to high-side power MOSFET and internal bias regulator. Connect directly to the input supply of the buck converter with short, low impedance paths. |
3 | EN/UVLO | I | Precision enable and undervoltage lockout (UVLO) programming pin. If the EN/UVLO voltage is below 1.1 V, the converter is in shutdown mode with all functions disabled. If the UVLO voltage is greater than 1.1 V and below 1.5 V, the converter is in standby mode with the internal VCC regulator operational and no switching. If the EN/UVLO voltage is above 1.5 V, the start-up sequence begins. |
4 | RON | I | On-time programming pin. A resistor between this pin and GND sets the buck switch on-time. |
5 | FB | I | Feedback input of voltage regulation comparator |
6 | PGOOD | O | Power good indicator. This pin is an open-drain output pin. Connect to a source voltage through an external pullup resistor between 10 kΩ to 100 kΩ. |
7 | BST | P/I | Bootstrap gate-drive supply. Required to connect a high-quality 2.2-nF 50-V X7R ceramic capacitor between BST and SW to bias the internal high-side gate driver. |
8 | SW | P | Switching node that is internally connected to the source of the high-side NMOS buck switch and the drain of the low-side NMOS synchronous rectifier. Connect to the switching node of the power inductor. |
— | EP | — | Exposed pad of the package. No internal electrical connection. Solder the EP to the GND pin and connect to a large copper plane to reduce thermal resistance. |