MAX8545/MAX8546/MAX8548 are PWM DC-DC converters with a maximum output current of 6A. They accept an input voltage range of 2.7V to 28V and provide an output voltage range of 0.8V to 0.9 times the input voltage. Features include low MOSFET RDS(ON), up to 95% efficiency, adjustable PWM frequency, and compatibility with MAX1967.
The MAX8545, MAX8546 and MAX8548 are voltage‑mode, PWM buck‑converter ICs designed for cost‑sensitive applications. They operate with a wide input range, provide adjustable output down to 0.8 V, and achieve efficiencies up to 95 %. The devices drive low‑cost n‑channel MOSFETs as high‑side switches and synchronous rectifiers without the need for an external sense resistor.
Key features include internal 5 V linear regulation for gate‑drive supplies, soft‑start to limit in‑rush current, input undervoltage lockout, and foldback short‑circuit protection. The ICs are offered in a compact 10‑pin HMAX package and are compatible with standard inductors and electrolytic capacitors. This manual is written in Chinese.
| Input voltage range | 2.7 V to 28 V |
|---|---|
| Output voltage range | 0.8 V to 0.83 × VIN |
| Switching frequency | 300 kHz (MAX8545/MAX8546), 100 kHz (MAX8548) |
| Efficiency | up to 95 % |
| Operating temperature range | -40 °C to +85 °C |
| Package | 10‑pin HMAX |
| External sense resistor | Not required |
The devices accept an input voltage from 2.7 V up to 28 V.
The MAX8545 (and MAX8546) operate at 300 kHz.
The MAX8546 has a current‑limit threshold of –165 mV.
They can reach efficiencies of up to 95 %.