MAX1678EUA+

The MAX1678EUA+ is a 1 cell to 2 cell, low noise, high efficiency, step up DC to DC converter in 8 pin µMAX package. It is a high efficiency, low voltage, synchronous- rectified, step up DC to DC converter intended for use in devices powered by 1 to 3 cell alkaline, NiMH or NiCd batteries or a 1 cell lithium battery. It has a 0.87V start-up voltage and features a low 37μA quiescent supply current. The device includes a 1ohm, N-channel MOSFET power switch, a synchronous rectifier that acts as the catch diode, a reference, pulse-frequency-modulation (PFM) control circuitry and circuitry to reduce inductor ringing all in an ultra-small, 1.1mm high μMAX package. The output voltage is preset to 3.3V or can be adjusted from +2V to +5.5V using only two resistors. Efficiencies up to 90% are achieved for loads up to 50mA. The device also features an independent undervoltage comparator (PFI/PFO) and a logic-controlled 2μA shutdown mode.

• Supply voltage range is 0.7V to 5.5V
• Operating temperature range from -40°C to 85°C
• Built-in synchronous rectifier (no external diode)
• Power-fail detector
• Output current is 45mA at 3.3V for 1 cell input and output current is 90mA at 3.3V for 2 cell input
• Inductor damping switch suppresses EMI

Notas

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