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.
