MAX734ESA+

The MAX734ESA+ is a flash memory programming supply in 8 pin NSOIC package. It is a 12V output, step-up, DC to DC switch mode regulator. It delivers 120mA output current from 4.75V input and it is ideal for programming flash memories. It uses only diode, 18μH inductor and two 33μF capacitors. The entire circuit is completely surface mountable and fits in to less than 0.3in². The MAX734 also has logic controlled shutdown pin that allows direct microprocessor (μP) control. In-circuit testing ensures output specifications over load, line and temperature limits. A battery saving feature include 85% efficiency, 1.2mA operating quiescent current and 70μA shutdown supply current. The operating supply current can be reduced to less than 500μA by toggling the shutdown pin with μP. A fixed 170KHz oscillator frequency facilitates ripple filtering and allows the use of tiny external capacitors. It is used in PCMCIA +12V supplies, solid state disk drives and compact 12V op-amp supplies.

• Supply voltage range from 3V to 12V
• Operating temperature range from -40°C to 85°C
• Load current of 150mA at V+ = 4.75V, 225mA at V+ = 4.5V and 150mA at V+ = 3V
• Line regulation of 0.20%/V (V+ = 5V to 12V) and load regulation of 0.0035%/mA at(Iload=0mA to 120mA)
• Efficiency of 83% (V+ = 5V and Iload = 120mA)
• Current mode PWM control to provide precise output regulation and low subhormonic noise

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