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
The LM5176 employs 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.
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