The MAX629ESA+T is a low power, high voltage, boost or inverting DC to DC converter in 8 pin NSOIC package. The device includes internal N-channel MOSFET switch and programmable current limiting. It is designed to supply positive or negative bias voltages up to ±28V from input voltages in 0.8V to VOUT range. The current limited pulse frequency modulation (PFM) control scheme of MAX629 provides high efficiency over a wide range of load conditions. An internal, 0.5A N channel MOSFET switch reduces total part count and high switching frequency (up to 300KHz) allows for tiny surface mount magnetics. The combination of low supply current, logic controlled shutdown, small package and tiny external components makes it an extremely compact and efficient high voltage biasing solution. It is used in positive or negative LCD bias generators, high efficiency DC to DC boost converters, varactor tuning diode bias and 2-cell and 3-cell battery powered applications.
● Input voltage range from 2.7V to 5.5V
● Operating temperature range from -40°C to 85°C
● Generates positive or negative output voltages
● Supply current of 80µA at VFB = 1.3V
● Maximum shutdown current of 1µA
● Adjustable current limit allows use of small inexpensive inductors
● Can be configured for boost, flyback and SEPIC topologies
