TC120中文资料PWM/PFM Step-Down Combination Regulator/Controller数据手册Microchip规格书

描述 Description

TC120 is a 300 KHz PFM/PWM step-down (Buck) DC/DC regulator/controller combination for use in systems operating from two or more cells, or in line-powered applications. It uses PWM as the primary modulation scheme, but automatically converts to PFM at low output loads for greater efficiency. It requires only an external inductor, Schottky diode, and two capacitors to implement a step-down converter having a maximum output current of 600 mA (VIN =5V, VOUT = 3.3V). An external switching transistor (P-channel MOSFET) can be added to increase output current capability to support output loads of 2A or more. The TC120 consumes only 55µA (max) of supply current (VOUT = 3.3V) and can be placed in shutdown mode by bringing the shutdown input (SHDN) low. During shutdown, the regulator is disabled, supply current is reduced to 2.5 µA(max), and VOUT is internally pulled to ground, discharging the output capacitor. Normal operation resumes when SHDN is brought high. Other features include a built-in undervoltage lockout (UVLO), an externally programmable soft start time, and output short circuit protection. The TC120 operates from a maximum input voltage of 10V and is available in a low-profile 8-Pin SOP package.

特性 Features

•Internal Switching Transistor •Supports 600mA Output Current•External Switching Transistor Control for Output Currents of 2A+ 300 KHz •Oscillator Frequency Supports Small Inductor Size•Short Circuit Protection•Built-In Undervoltage Lockout•High (95%, Typ) Efficiency•Automatic Switchover to Current-Saving PFM Mode at Low Output Loads•Automatic Output Capacitor Discharge While in Shutdown•Programmable Soft-Start Time•Power-Saving Shutdown Mode

简介

TC120属于集成电路（IC）的DCDC开关稳压器。由制造生产的TC120稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。