The MAX731 and MAX752 are CMOS step‑up DC‑DC switch‑mode regulators. MAX731 converts a 2.5 V‑5.25 V input to a fixed +5 V output at up to 200 mA, while MAX752 provides an adjustable output from +1.8 V up to +15 V at the same current. Both devices use a 170 kHz current‑mode PWM controller, offer cycle‑by‑cycle current limiting, over‑current protection, and programmable soft‑start.
Typical applications include 5 V logic supplies for 3 V‑logic systems, portable instruments, laptop computers, cellular phones, and other battery‑powered equipment. The datasheet also gives recommended external components such as a 22 µH inductor for MAX731, a 50 µH inductor for MAX752, and guidelines for output filter capacitors and PCB layout.
| Input voltage range (MAX731) | +2.5 V to +5.25 V |
|---|---|
| Output voltage (MAX731) | Fixed +5 V |
| Output current (both devices) | 200 mA |
| Typical efficiency (MAX731) | 82 % to 87 % at full load |
| Typical efficiency (MAX752) | 85 % to 95 % at full load |
| Quiescent current (MAX752) | 2 mA |
| Oscillator frequency | 170 kHz |
| Package options | 8‑Pin DIP, 16‑Pin Wide SO |
The MAX731 operates with an input voltage from +2.5 V up to +5.25 V.
The MAX752 can supply up to 200 mA of output current.
Typical full‑load efficiency for the MAX731 is between 82 % and 87 %.