28V, 5A Low I Synchronous Step-Up Silent Switcher with PassThru

The LT8337/LT8337-1 is a low IQ, synchronous step-up DC/DC converter. It features Silent Switcher architecture and optional spread spectrum frequency modulation (SSFM) to minimize EMI emissions while delivering high efficiencies at high switching frequencies.

The wide input/output voltage range, low VIN pin quiescent current in Burst Mode operation, and 100% duty-cycle capability for the synchronous MOSFET in PassThru operation (VIN > VOUT) makes the LT8337/LT8337-1 ideally suited for battery-powered systems and general purpose step-up applications.

The LT8337/LT8337-1 integrates 28V, 5A power switches, operating at a fixed switching frequency programmable between 300kHz and 3MHz and synchronizable to an external clock. The LT8337/LT8337-1 features output soft-start and output overvoltage lockout.

The LT8337-1 allows external compensation via the VC pin for fast transient response. The LT8337 offers an output power good flag via the PG pin.

Applications

* Battery-Powered Systems

* General Purpose Step-Up

* Silent Switcher® Architecture

* Ultralow EMI Emissions

* Optional Spread Spectrum Frequency Modulation

* Integrated 28V, 5A Power Switches

* Wide Input Voltage Range: 2.7V to 28V

* Output Voltage Programmable Up to 26V

* Low VIN Pin Quiescent Current

* 0.3μA in Shutdown

* 4μA in Burst Mode® Operation (LT8337)

* 15μA in PassThru™ (LT8337)