The MAX734 is a + 12V-output, step-up, DC-DC switch-mode
regulator. It delivers a guaranteed 120mA from a
4. 75V input, and is ideal for programming flash
memories. Available in 8-pin SO and DIP packages, it
uses only a diode, an 18μH inductor, and two 33μF
capacitors. The entire circuit is completely surface-mountable
and fits into less than 0.3in2. The MAX734
also features a logic-controlled shutdown pin that allows
direct microprocessor (μP) control. In-circuit testing ensures
guaranteed output specifications over load, line,
and temperature limits.
Battery-saving features include 85% efficiency,
1.2mA operating quiescent supply current, and 70μA
_shutdown supply current. The operating supply current
can be reduced to less than 500μA by toggling
the shutdown pin with the μP.
The MAX734 uses current-mode pulse-width modulation
(PWM) control to provide precise output regulation and
low subharmonic noise. A fixed 170kHz oscillator frequency
facilitates ripple filtering and allows the use of tiny
external capacitors.
For higher-current solutions up to 250mA, refer to the
MAX732 data sheet and evaluation kit (MAX732EVKIT-SO).
APPLICATIONS
- + 12V Flash Memory Programming Supplies
- PCMCIA +12V Supplies
- Solid-State Disk Drives
- Palmtop Computers
- Compact + 12V Op-Amp Supplies
