High-frequency, low-noise, low-voltage step-down regulator

May 29, 2013 // By Graham Prophet
Exar's XRP6670 delivers 3A and employs a 2.5 MHz programmable operating frequency, for use in EMC/EMI sensitive applications

The programmable operating frequency of the XRP6670 offers power design engineers increased flexibility in optimising component values, size and performance enabling precise management of electromagnetic interference (EMI) compliance and electromagnetic compatibility (EMC).

Operating from a 2.6V to 5.5V input voltage range, the XRP6670 is capable of supplying up to 3A of continuous current with an adjustable output voltage as low as 0.8V. This synchronous PWM voltage regulator can accommodate a broad range of inductor and output capacitor values through its constant 300kHz to 2.5MHz programmable operating frequency. Additionally, the adjustable frequency range of the XRP6670, which is set via a single resistor, allows the user to optimise size, transient response and efficiency while precisely positioning the fundamental operating frequency and subsequent harmonics. For industrial, medical, and audio and video equipment, the XPR6670, with its compact form factor and reduced component count, is also suitable for space sensitive applications.

The XRP6670 provides a low output voltage ripple, excellent line and load regulation and has a 100% duty cycle LDO mode. Output voltage is adjustable to as low as 0.8V with a better than 2% accuracy. Additionally, built-in over-temperature, over-current, short circuit and under-voltage lock-out protections insure safe operations under abnormal operating conditions. It costs $1.05 (1000) and occupies a 3 x 3mm, 10-Pin DFN package.

Exar, www.exar.com