55V wide VIN synchronous 4-switch buck-boost controller

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

cycle-by-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.