ISL6535 is a high performance synchronous controller from ISL company, which is used for demanding DC/DC converter applications. It provides overcurrent fault protection and is designed to safely start up into prebiased output loads. The output voltage of the converter can be precisely regulated to as low as 0.597V, with a maximum tolerance of ±1% over the commercial temperature range, and ±1.5% over the industrial temperature range. ISL6535 provides simple, single feedback loop, voltage-mode control with fast transient response. It includes a triangle-wave oscillator that is adjustable from below 50kHz to over 1.5MHz. Full (0% to 100%) PWM duty cycle support is provided. The error amplifier features a 15MHz gain-bandwidth product and 6V/µs slew rate which enables high converter bandwidth for fast transient performance. The ISL6535's overcurrent protection monitors the current by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.
The ISL6535 synchronous buck PWM controller is designed for demanding DC/DC converter applications. It provides over‑current fault protection, a precise 0.597 V internal reference, and voltage‑mode control with fast transient response. The device supports a wide input range and can be configured for both SOIC and QFN packages.
Key features include a programmable triangle‑wave oscillator (200 kHz‑1.5 MHz), high‑speed MOSFET gate drivers (up to 1.25 A source/2 A sink at 12 V), and a built‑in soft‑start circuit. The datasheet also covers layout guidelines, absolute maximum ratings, and detailed pin descriptions for system integration.
| Internal Reference Voltage | 0.597 V |
|---|---|
| Output Voltage Tolerance (Commercial Temp) | +1 % |
| Output Voltage Tolerance (Industrial Temp) | +1.5 % |
| Operating Temperature Range | -40 °C – 85 °C |
| High‑Side Gate Driver Source Current | 1.25 A |
| Low‑Side Gate Driver Source Current | 2.0 A |
| Overcurrent Protection Blanking Time | ≈120 ns |
The internal reference voltage is 0.597 V.
The over‑current protection uses a blanking period of about 120 ns.
The device is available in a 14‑lead narrow SOIC and a 16‑lead QFN package.