General Description

The RT7251A/B is a high efficiency, monolithic synchronous step-down DC/DC converter that can operate at 340kHz/800kHz, while delivering up to 1.5A output current from a 4V to 17V input supply. The RT7251A/Bs current mode architecture allows the transient response to be optimized. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up.

Features

• 4V to 17V Input Voltage Range

• 1.5A Output Current

• Internal N-MOSFETs

• Current Mode Control

• Fixed Frequency Operation : 340kHz/800kHz

• Output Adjustable from 0.8V to 12V

• Up to 95 Efficiency

• Internal Compensation

• Stable with Low ESR Ceramic Output Capacitors

• Cycle-by-Cycle Over Current Protection

• Input Under Voltage Lockout

• Output Under Voltage Protection

• Output Over Voltage Protection

• Power Good Indicator

• Thermal Shutdown Protection

• RoHS Compliant and Halogen Free

Applications

• Industrial and Commercial Low Power Systems

• Computer Peripherals

• LCD Monitors and TVs

• Green Electronics/Appliances

• Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs