ISL6526AIRZ-T

The ISL6526AIRZ-T from Renesas is a single synchronous buck Pulse-Width Modulation (PWM) controller. It is designed to drive N-Channel MOSFETs in a DC/DC step-down converter topology. This controller integrates control, output adjustment, monitoring, and protection functions into a single package.

The device provides simple, single-feedback loop, voltage-mode control with fast transient response. The output voltage can be precisely regulated to as low as 0.8V, with a maximum tolerance of ±1.5% over temperature and line voltage variations. A fixed frequency oscillator, set at 600kHz for the ISL6526A variant, reduces design complexity. The error amplifier features a 15MHz gain-bandwidth product and 6V/µs slew rate, enabling high converter bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%.

Protection from overcurrent conditions is provided by monitoring the rDS(ON) of the upper MOSFET, simplifying implementation and improving efficiency by eliminating the need for a current sense resistor. The converter can source and sink current. The ISL6526AIRZ-T is available in a 16-QFN (5x5) package, suitable for surface mounting.

Applications for this controller include power supplies for microprocessors, subsystem power supplies, memory supplies, and industrial power supplies. It is particularly useful for 3.3V-input DC-DC regulators and low-voltage distributed power supplies.