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

簡介

TC120屬于集成電路（IC）的DCDC開關(guān)穩(wěn)壓器。由制造生產(chǎn)的TC120穩(wěn)壓器 - DC-DC 開關(guān)穩(wěn)壓器DC-DC 開關(guān)穩(wěn)壓器 PMIC（電源管理集成電路）產(chǎn)品族中的產(chǎn)品是元器件級設(shè)備，用于需要穩(wěn)定 DC 輸入電壓和/或?qū)⑵滢D(zhuǎn)換為不同幅度的輸出電壓的應(yīng)用。這些器件與稱為“控制器”PMIC 的類似產(chǎn)品的區(qū)別在于集成了主開關(guān)元件，設(shè)備提供的電力會通過該元件。