LM5177数据手册TI中文资料规格书

描述 Description

LM5177 是一款四开关降压/升压控制器。无论输入电压是高于、等于还是低于调节后的输出电压，该器件均可提供稳定的输出电压。在电源安全模式下，该器件具有低静态电流，因此可在低输出负载条件下实现高效率。 LM5177 以固定开关频率运行，该开关频率可通过 RT 或 SYNC 引脚设置。在降压、升压和降压/升压运行期间，开关频率保持不变。集成的可选平均电流监测器可帮助监测并限制 LM5177 的输入和输出电流。此功能还支持使用恒流 (CC) 和恒压 (CV) 模式为备用电源元件（如电池或电容器）充电。

特性 Features

• Wide input range from 3.5 V to 78 V (80-V absolute maximum)
• Minimum 2.8 V when V(BIAS) > 3.5 V

• Output voltage from 3.3 V to 78 V
• Low shutdown IQ of 3 µA
• Low operating IQ of 60 µA
• 3% reverse current limit accuracy for precise charging currents
• Average input and output current monitor or limiter
• Dynamic output voltage tracking for PWM or analog input signals
• Power save mode (PSM) selectable for high light load efficiency
• Two integrated high-voltage supply LDOs with automatic selection
• 2-A peak current logic level gate driver
• Integrated bootstrap diode
• Bootstrap overvoltage and undervoltage protection

• Fixed frequency independent from operating mode (boost, buck-boost, buck)
• Forced PWM mode selectable
• Switching up to 2 MHz for small solution and component size
• External clock synchronization

• Spread spectrum operation selectable
• Adjustable undervoltage and overvoltage protection
• Hiccup overcurrent protection