1 特性 3V 至 65V 宽输入电压范围 10.5µA 空载静态电流 –40°C 至 150°C 结温范围 固定(3.3V、5V)或可调节输出电压 符合 EN55022/CISPR 22 EMI 标准 集成 2Ω P 型金属氧化物半导体 (PMOS) 降压开关 支持 100% 占空比,可实现低压降 集成 1Ω N 型金属氧化物半导体 (NMOS) 同步整流器 无需使用外部整流二极管 可编程的电流限制设定值(4 级) 可选 PFM 或 COT 模式工作 1.223V ±1% 内部电压基准 900µs 内部或可编程软启动 用于实现较低 EMI 的有效转换率控制 二极管仿真模式以及用于在轻负载时确保超高效率性能的脉冲跳跃 单调启动至预偏置输出 无环路补偿或自举升压组件 具有迟滞功能的精密使能和输入 UVLO 与 LM5166 引脚对引脚兼容 具有迟滞功能的热关断保护 10 引脚 3mm × 3mm VSON 封装 使用 WEBENCH® 电源设计器创建定制稳压器设计 2 应用 4mA–20mA 回路供电传感器 汽车和电池供电设备 高电压 LDO 替代产品 工业控制系统 通用偏置电源 3 说明 LM5165 器件是一款易于使用的紧凑型 3V 至 65V、超低 IQ 同步降压转换器,可在宽输入电压和负载电流范围内提供高效率。该器件具有集成式高侧和低侧功率 MOSFET,能够以 3.3V 或 5V 的固定输出电压或可调输出电压提供高达 150mA 的输出电流。该转换器设计旨在简化实现方案,同时优化目标应用的性能。脉频调制 (PFM) 模式可确保在轻负载条件下获得最优效率,恒定导通时间 (COT) 控制可实现近似恒定的工作频率。这两种控制方案都不需要环路补偿,同时还能够针对较高的降压转换比实现出色的线路和负载瞬态响应以及短暂的脉宽调制 (PWM) 导通时间。 高侧 P 沟道 MOSFET 能够以 100% 占空比工作以确保最低压差电压,而且不需要使用自举电容器进行栅极驱动。另外,还可以调节电流限制设定值来优化电感器选择,从而满足特定的输出电流要求。可选和可调节启动时序选项包括最短延迟(无软启动)、内部固定值 (900µs) 以及可使用电容器进行外部编程的软启动。可以使用开漏 PGOOD 指示器进行定序、故障报告和输出电压监视。LM5165 降压转换器采用 10 引脚 3mm × 3mm 热增强型 VSON-10 封装(引脚间距为 0.5mm)。 该产品品牌下其它产品相关信息可咨询:https://www.iczoom.com/brand/509-c-1-20.html The LM5165 converter is an easy-to-use synchronous buck DC-DC regulator that operates from a 3-V to 65-V supply voltage. The device is intended for step-down conversions from 3.3-V, 5-V, 12-V, 24-V, and 48-V unregulated, semi-regulated and fully-regulated supply rails. With integrated high-side and low-side power MOSFETs, the LM5165 delivers up to 150-mA DC load current with high efficiency and ultra-low input quiescent current in a very small solution size. Designed for simple implementation, a choice of operating modes offers flexibility to optimize its usage according to the target application. In constant on-time (COT) mode of operation, ideal for low-noise, high current, fast load transient requirements, the device operates with predictive on-time switching pulse. A quasi-fixed switching frequency over the input voltage range is achieved by using an input voltage feedforward to set the on-time. Alternatively, pulse frequency modulation (PFM) mode, complemented by an adjustable peak current limit, achieves exceptional light-load efficiency performance. Control loop compensation is not required with either operating mode, reducing design time and external component count. The LM5165 incorporates other features for comprehensive system requirements, including an open-drain Power Good circuit for power-rail sequencing and fault reporting, internally-fixed or externally-adjustable soft-start, monotonic start-up into prebiased loads, precision enable with customizable hysteresis for programmable line undervoltage lockout (UVLO), adjustable cycle-by-cycle current limit for optimal inductor sizing, and thermal shutdown with automatic recovery. These features enable a flexible and easy-to-use platform for a wide range of applications. The pin arrangement is designed for simple Layout, requiring only a few external components. |