30-V Wide VIN Synchronous 4-Switch Buck-Boost Controller

The LM34936 is a synchronous

four-switch buck-boost DC/DC controller capable of regulating the output voltage at,

above, or below the input voltage. The LM34936 operates over a wide input voltage

range of 4.2 V to 30 V (42-V absolute maximum) to support a variety of

applications.

The LM34936 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 LM34936

features optional average input or output current limiting, optional spread spectrum

to reduce peak EMI, and optional hiccup mode protection in sustained overload

conditions.