The IR3842WMPbF is an easy-to-use, fully integrated and highly efficient DC/DC synchronous Buck regulator. It features an integrated MOSFETs and on-chip PWM controller, making it a space-efficient solution for low output voltage applications. It also offers programmability of start up time, switching frequency and current limit while operating in wide input and output voltage range. The switching frequency is programmable from 250kHz to 1.5MHz for an optimum solution. It also features important protection features such as over current protection, PGood output, hiccup current limit and precision reference voltage.
The IR3842WMPbF synchronous buck regulator from International Rectifier delivers up to 4 A output current with a wide input range of 1.5 V to 16 V and an adjustable output of 0.7 V to 0.9 × Vin. It offers programmable switching frequency (250 kHz‑1.5 MHz), integrated bootstrap diode, soft‑start, over‑current protection, and a compact 5 mm × 6 mm QFN package.
Typical applications include point‑of‑load power architectures, server and storage systems, telecom equipment, and general DC‑DC conversion. The device operates from –40 °C to 125 °C, meets RoHS requirements, and provides high efficiency (>95%).
| Input Voltage Range | 1.5 V – 16 V |
|---|---|
| Output Voltage Range | 0.7 V – 0.9 × Vin |
| Maximum Output Current | 4 A |
| Switching Frequency | 250 kHz – 1.5 MHz |
| Efficiency | >95 % |
| Operating Temperature Range | -40 °C – 125 °C |
| Package | 5 mm × 6 mm Power QFN, 0.9 mm height |
| Enable Input Voltage Monitoring | Supported |
The device is rated for a maximum input voltage of 16 V.
The switching frequency can be programmed from 250 kHz up to 1.5 MHz.
It is supplied in a 5 mm × 6 mm Power QFN package with a 0.9 mm height.
The regulator achieves greater than 95 % maximum efficiency.