MAX640ESA+

The MAX640ESA+ is a high efficiency, low IQ, step down DC to DC converter in 8 pin NSOIC package. This step down switching regulator provides high efficiency over a wide range of load currents and delivers up to 225mA output current. A current limiting pulse frequency modulated (PFM) control scheme gives the devices the benefits of pulse width modulated (PWM) converters (high efficiency at heavy loads) while using only 10μA of supply current (2mA to 10mA for PWM converters). This results in high efficiency over wide range of loads. The MAX640 provides lower preset output voltage of 3.3V and the output can be user adjusted to any voltage from 1.3V to input voltage. It has an internal 1A power MOSFET switch which makes the device ideal for minimum component, low and medium power applications. It is typical used for 9V battery to 5V, 3.3V or 3V conversion, high efficiency linear regulator replacement and 5V to 3.3V converters.

• Supply voltage range from 4V to 11.5V
• Operating temperature range from -40°C to 85°C
• Low supply current, high efficiency over wide load range
• Quiescent current of 10μA
• Low battery detection comparator
• Efficiency of 91% (IOUT = 25mA, L = 470μH) and 87% (IOUT = 100mA, L = 100μH)
• Switch on-time of 71.4μs (V+ = 4V, VOUT = 3.3V) and 8.8μs (V+ = 9V, VOUT = 3.3V)
• Switch off-time of 15.6μs (V+ = 4V, VOUT = 3.3V) and 15.6μs (V+ = 9V, VOUT = 3.3V)

Applications

Power Management, Portable Devices

Warnings

Market demand for this product has caused an extension in leadtimes. Delivery dates may fluctuate. Product exempt from discounts.

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party