The MAX1954A is an upgraded version of the MAX1954, which uses a synchronous current-mode control, pulse-width modulation (PWM) buck controller. The input voltage range is 3.0V to 13.2V, and the output voltage can be adjusted to 0.8V. The IC operates at a fixed 300kHz switching frequency and provides up to 25A of output current with efficiency up to 95%.
The MAX1954A synchronous current‑mode buck controller is pin‑compatible with the MAX1954 and is designed for applications where cost and size are critical. It operates from 3.0 V to 13.2 V input, provides an adjustable output down to 0.8 V, and delivers up to 25 A with up to 95 % efficiency.
Key features include foldback current limiting, internal digital soft‑start, a 10‑pin µMAX package, and no external current‑sense resistor. The datasheet details absolute maximum ratings, electrical characteristics, typical operating curves, pin functions, application circuits, and PCB layout guidelines.
| Switching Frequency | 300 kHz (fixed) |
|---|---|
| Maximum Output Current | 25 A |
| Efficiency | up to 95 % |
| Adjustable Output Voltage | 0.8 V – (depends on external divider) |
| Package | 10‑pin µMAX |
| Operating Temperature Range | -40 °C to +85 °C |
| Foldback Current Limit | Enabled, reduces current during overload/short‑circuit |
| Internal Digital Soft‑Start | Enabled, 3.4 ms period |
It uses a fixed 300 kHz switching frequency.
It can deliver up to 25 A of output current.
Yes, it features foldback current limiting to reduce input current and power dissipation during overload or short‑circuit conditions.