The LM708x0-Q1 is a family of multi-die DC/DC converters that features high-side and low-side power MOSFETs and a versatile buck controller with all functions necessary to implement a high-efficiency synchronous buck regulator operating over a wide input voltage range from 4.5V to 80V. The LM708x0-Q1 is configured to provide a fixed 3.3V, 5V, or a 12V output, or an adjustable output between 0.8V and 55V.

Current-mode control using a shunt resistor provides inherent line feedforward, cycle-by-cycle peak current limiting, and easy loop compensation. The device also supports a wide duty cycle range for high input voltage and low dropout applications as well as when a high-voltage conversion ratio (for example, 10-to-1) is required. The oscillator frequency is user-programmable between 200kHz to 2.2MHz. The LM708x0-Q1 can be synchronized to an external clock applied on the PFM / SYNC pin.

An external bias supply can be connected to the BIAS pin to maximize efficiency in high input voltage applications. A user-selectable diode emulation feature enables discontinuous conduction mode (DCM) operation to further improve efficiency and reduce power dissipation during light-load conditions. Fault protection features include current limiting, thermal shutdown, UVLO and remote shutdown capability.

The LM708x0-Q1 incorporates features to simplify the compliance with various EMI standards including CISPR 25 Class 5 that defines automotive EMI requirements. Dual Random Spread Spectrum (DRSS) technique reduces the peak harmonic EMI signature.

LM708x0-Q1 is provided in a 29-pin QFN package with the exposed VIN, SW, and PGND pads to maximize thermal dissipation.