5A & 3A power modules for battery-powered industrial/high-end consumer

May 24, 2016 // By Graham Prophet
Intersil's latest single-channel DC/DC step-down power modules are designed for high power density and up to 95% efficiency in a 4.5 x 7.5 x 1.85 mm footprint: 5A ISL8205M and 3A ISL8202M provide point-of-load (POL) conversions for FPGAs, DSPs and MCUs in a wide range of home networking and high-end consumer products, as well as portable industrial equipment that use Li-ion batteries.

The modules are complete power supplies that include a controller, MOSFETs, inductor and passive components inside an encapsulated module, simplifying system design. With a height of 1.85 mm, the ISL8205M and ISL8202M can be directly mounted on the backside of a PCB. Both devices support input voltages from 2.6V to 5.5V and offer adjustable output voltages down to 0.6V. The pin compatibility allows engineers to start with a 3A power module and later migrate to the higher 5A output current, or design a power tree with multiple POL output rails. For battery-operated applications, the ISL8205M and ISL8202M offer efficiency and power saving features to extend battery life. Selectable light load efficiency, 100% duty cycle modes and 50 µA quiescent current enable better efficiency and lower power consumption at light load.

 

A copper lead-frame structure allows the modules to operate at full load over a wide temperature range with no airflow or heatsinks. The ISL8205M and ISL8202M also provide several protection features that ensure safe operations under abnormal operating conditions

 

"The ISL8202M and ISL8205M analog power modules speed time to market and provide the industry's best combination of power density and performance," said Mark Downing, senior vice president of Infrastructure and Industrial Power Products at Intersil. "Their size, light load efficiency and 100% duty cycle performance gives customers everything they need to address their increasingly compact battery-powered designs."

 

Their outputs are ±1.6% accuracy over line, load and temperature; switching frequency is adjustable from 680 kHz to 3.5 MHz, with 1.8 MHz default, and external clock signal synchronization up to 3.5MHz; and an enable pin and power-good flag simplify sequencing of system power rails. Fault protections include input under-voltage lockout, over-temperature, over-current/short-circuit with hiccup mode, over-voltage and negative over-current: programmable soft-start reduces inrush current, and automatic output discharge ensures a soft stop.

 

The ISL8205M in the 22-lead QFN package is priced at $3.79: the ISL8202M is $2.79