The Maxim MAX734 is a +12 V step‑up, current‑mode PWM DC‑DC switch‑mode regulator designed for flash‑memory programming supplies and other low‑power applications. It delivers a guaranteed 120 mA output current from a 4.75 V input and features a logic‑controlled shutdown pin for power‑saving operation.
Typical applications include PCMCIA +12 V supplies, solid‑state disk drives, palmtop computers, and compact op‑amp supplies. The device offers 85 % typical efficiency, a 1.23 V band‑gap reference, and selectable soft‑start timing via the SS pin. Design guidance covers inductor and output‑filter capacitor selection, PCB layout, and methods to reduce quiescent current.
| Output Current | 120 mA (guaranteed) |
|---|---|
| Typical Efficiency | 85 % |
| Quiescent Supply Current (normal operation) | 1.2 mA |
| Shutdown Supply Current | 70 pA |
| Reference Voltage | 1.23 V |
| Operating Temperature Range | 40 °C to +85 °C |
| Storage Temperature Range | 65 °C to +160 °C |
By toggling the SHDN pin, the supply current can be lowered to less than 500 µA.
The device operates at about 85 % typical efficiency.