ISL8205M: excellent light-load efficiency
Intersil’s new ISL8205M is a complete single-channel step-down power-supply module which can provide up to 5A of continuous current. The new ISL8202M, with which the ISL8205M is pin- and function-compatible, supplies up to 3A of continuous current.
The modules consist of a controller, power inductor and MOSFETs, and require only a few external components, making them ideal for use in space-constrained and portable applications.
The modules implement a currentmode PWM control scheme which produces a fast response to transient voltages and excellent loop stability.
They also implement a selectable pulse-frequency modulation mode to improve light-load efficiency, and a 100% duty-cycle low dropout-regulator mode to extend battery life.
The modules’ operating frequency is selectable through an external resistor in a range from 680kHz to 3.5MHz, or it may be synchronised with an external clock signal with a frequency up to 3.5MHz. A programmable soft-start reduces the in-rush current from the input supply, while an automatic outputdischarge function ensures a soft-stop.
- Point-of-load power supplies
- Power supply for a microcontroller, micro processor, FPGA or DSP
- Portable equipment
- Battery-powered devices
- Up to 95% efficiency
- Dedicated Enable pin and Power Good flag
- Under-voltage lock-out protection
- Over-temperature protection
- Over-current and over-voltage protections
- Negative over-current protection