LM1770集成电路（IC）的DC-DC开关控制器规格书PDF中文资料

LM1770属于集成电路（IC）的DC-DC开关控制器。由德州仪器制造生产的LM1770DC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。

1FEATURES

2• Input Voltage Range of 2.8V to 5.5V

• 0.8V Reference Voltage

• No Compensation Required

• Constant Frequency Across Input Range

• Low Quiescent Current of 400μA

• Internal Soft-start

• Short Circuit Protection

• 5-Pin SOT-23 Package

APPLICATIONS

• Simple To Design, High Efficiency Step Down

Switching Regulators

• Set-Top Boxes

• Cable Modems

• Printers

• Digital Video Recorders

• Servers

DESCRIPTION

The LM1770 is an efficient synchronous buck

switching controller in a tiny SOT-23 package. The

constant on-time control scheme provides a simple

design free of compensation components, allowing

minimal component count and board space. It also

incorporates a unique input feed-forward to maintain a constant frequency independent of the input

voltage. The LM1770 is optimized for a low voltage

input range of 2.8V to 5.5V and can provide an

adjustable output as low as 0.8V. Driving an external

high side PFET and low side NFET it can provide

efficiencies as high as 95%.

Three versions of the LM1770 are available depending on the switching frequency desired for the

application. Nominal switching frequencies are in the

range of 100kHz to 1000kHz.