The MAX735 and MAX755 are CMOS inverting switch‑mode regulators with internal power MOSFETs. The MAX735 provides a -5 V output from a 4.0 V‑6.2 V supply, while the MAX755 generates an adjustable negative output from a 2.7 V‑9 V supply. Both devices use a current‑mode PWM control scheme with a fixed 160 kHz oscillator, delivering high efficiency and low noise.
The datasheet includes absolute maximum ratings, electrical characteristics, typical operating curves, pin descriptions, recommended application circuits (both surface‑mount and through‑hole), component supplier lists, layout guidelines, and package information for the various DIP and CERDIP options.
| Input Voltage Range (MAX755) | 2.7 V to 9 V |
|---|---|
| Output Voltage Range (MAX735) | 4.0 V to 6.2 V |
| Maximum Output Current (MAX735) | 200 mA |
| Quiescent Current (MAX735) | 1.6 mA typical |
| Shutdown Current (MAX735) | 10 µA |
| Typical Efficiency | 78 % |
| Oscillator Frequency | 160 kHz |
| Reference Voltage (VREF pin) | 1.23 V |
| Undervoltage Lock‑Out Threshold (MAX735) | 3.7 V typ (4 V guaranteed) |
The regulators achieve about 78 % typical efficiency.
The MAX735 draws about 1.6 mA quiescent current, and its shutdown mode reduces this to 10 µA.
Both devices use a fixed‑frequency oscillator set at 160 kHz.
The MAX755 operates from a 2.7 V to 9 V input voltage.