ISL6406, ISL6426 is an adjustable frequency, synchronous buck switching regulator optimized for generating lower voltages for the distributed DC-DC architectures. ISL6406 offers an adjustable output voltage, while ISL6426 provides a fixed 1.8V output. Designed to drive N-Channel MOSFETs in synchronous buck topology, the ISL6406, ISL6426 integrates the control, output adjustment and protection functions into a single package. The ISL6406, ISL6426 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. The error amplifier features a 15MHz gain-bandwidth product and 6V/µs slew rate which enables high converter bandwidth for fast transient performance. Protection from overcurrent conditions is provided by monitoring the rDS(ON) of the upper MOSFET to inhibit PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor. The wide programmable switching frequency range of 100kHz to 700kHz allows the use of small surface mount inductors and capacitors. The device also provides external frequency synchronization making it an ideal choice for DC-DC converter applications.
The ISL6406 and ISL6426 are single‑stage synchronous buck PWM controllers designed for low‑voltage DC‑DC conversion. The ISL6406 provides an adjustable output, while the ISL6426 delivers a fixed 1.8 V output. Both devices integrate control, output adjustment and protection functions in a single package and drive N‑channel MOSFETs in a synchronous topology.
Key features include a wide programmable switching frequency (100 kHz‑700 kHz), internal soft‑start, lossless programmable over‑current protection, and external frequency synchronization. The devices are offered in SOIC, TSSOP and QFN packages and are RoHS‑compliant with Pb‑free options.
| Input voltage range | 3.3 V / 5 V |
|---|---|
| Output voltage range | 0.8 V to VIN |
| Programmable switching frequency | 100 kHz – 700 kHz |
| Reference voltage | 0.8 V (nominal) |
| Package options | SOIC, TSSOP, QFN |
The device can be programmed to operate between 100 kHz and 700 kHz.
The ISL6406 offers an adjustable output from 0.8 V up to the input voltage.
They are offered in SOIC, TSSOP and QFN packages.
The nominal reference voltage is 0.8 V.