Enhanced efficiency for low-voltage regulators

The NCP3120/3 dual step-down converter ICs from On Semiconductor deliver enhanced efficiency in lowvoltage, high-current applications.

With two 2.0A regulators in the NCP3120, and two 3.0A regulators in the NCP3123, both devices are capable of producing voltages as low as 0.8V. An on-chip 0.8V reference is provided, accurate to ±1.5%, for uniform accuracy across a range of operating conditions. The switching frequency is adjustable from 200kHz to 750kHz using an external resistor, allowing the use of a small output capacitor and inductor to save board area. In addition, 180° out-of-phase operation minimises the requirement for input capacitance.

Built-in features include voltage tracking, sequencing, and comprehensive protection including cycle-by-cycle current limit and Under- Voltage Lockout (UVLO). In each device the two output channels can be turned off independently, entering a low-power state to support flexible power management. Both devices are delivered in a small-outline 32-pin QFN package.

 

FEATURES Input voltage range: 4.5V to 13.2V Efficiency at 12VIN to 3.3VOUT: NCP3120: >87% @ 2.0A NCP3123: >80% @ 3.0A Stable with low-ESR ceramic output capacitor External soft-start

APPLICATIONS Low-voltage, high-current applications LCD-TV logic boards Set-Top Box (STB) power supplies Broadband modems

 

 

 

Development boards NCP3120/1/2/3-QPBCKGEVB are available to members of the Future Board Club. To apply for the development board, and membership of the Board Club, go to www.my-boardclub.com/manf-offers.htm This offer is free and subject to qualification.

 

On Semiconductor: NCP3120