LM5176集成电路（IC）的DC-DC开关控制器规格书PDF中文资料

LM5176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LM5176DC-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。

1 Features

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Single inductor buck-boost controller for step-up/

step-down DC/DC conversion

• Wide VIN: 4.2 V (2.5 V with bias) to 55 V (60 V

maximum)

• Flexible VOUT: 0.8 V to 55 V

• VOUT short protection

• High efficiency buck-boost transition

• Adjustable switching frequency

• Optional frequency sync and dithering

• Integrated 2-A MOSFET gate drivers

• Cycle-by-cycle current limit and optional hiccup

• Optional input or output average current limiting

• Programmable input UVLO and soft start

• Power Good and output overvoltage protection

• Available in HTSSOP-28 and QFN-28 packages

• Create a custom design using the LM5176 with the

WEBENCH Power Designer

2 Applications

• Industrial PC power supplies

• USB power delivery

• Battery-powered systems

• LED lighting

3 Description

The LM5176 is a synchronous four-switch buck-boost

DC/DC controller capable of regulating the output

voltage at, above, or below the input voltage. The

LM5176 operates over a wide input voltage range of

4.2 V to 55 V (60-V absolute maximum) to support a

variety of applications.

The LM5176 uses current-mode control both in

buck and boost modes of operation for superior

load and line regulation. The switching frequency

is programmed by an external resistor and can be

synchronized to an external clock signal.

The device also features a programmable soft-start

function and offers protection features including cycleby-

cycle current limiting, input undervoltage lockout

(UVLO), output overvoltage protection (OVP), and

thermal shutdown. In addition, the LM5176 features

optional average input or output current limiting,

optional spread spectrum to reduce peak EMI, and

optional hiccup mode protection in sustained overload

conditions.