The LM5175 is a synchronous four-switch buck-boost DC/DC controller capable of
regulating the output voltage at, above, or below the input voltage. The LM5175 operates over a
wide input voltage range of 3.5 V to 42 V (60 V maximum) to support a variety of
The LM5175 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 LM5175 features selectable
Continuous Conduction Mode (CCM) or Discontinuous Conduction Mode (DCM) operation, optional average
input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup
mode protection in sustained overload conditions.