MAX17291B

The MAX17291B is a low quiescent current boost (step-up) DC-DC converter with a 100mA peak inductor current limit and True Shutdown. True Shutdown disconnects the output from the input with no forward or reverse current. The output voltage is set with an external resistor-divider. The MAX17291B offers low quiescent current, small total solution size, and high efficiency throughout the entire load range. The MAX17291B is a highly integrated boost converter designed for applications requiring high voltage and tiny solution size, such as sensor modules. It integrates a power switch, power diode, and output load switch. It can output 5.5V to 20V from a 1.8V to 4.5V input supply range. The load switch is turned off under shutdown mode, truly disconnecting the load from the input voltage thus minimizing the leakage current during shutdown mode. The device operates in a discontinuous conduction mode of operation. The device features short-circuit and thermal protection.

The MAX17291B employs a power-save mode with pulse frequency modulation (PFM) to improve efficiency. The on-time is determined by a peak inductor current limit of 100mA. Once the inductor current hits its limit, the on-time is terminated and the power diode is forward-biased. During the off-time, charge is transferred to output capacitance, causing its voltage to rise. The off-time is terminated once the inductor current ramps down to zero; the load is supplied by the output capacitor and the output voltage declines. When the FB voltage falls below the reference voltage, the device initiates the on-time again to bring the output voltage up. The MAX17291B will clamp the average input current to maximum of 50mA.

Applications

• Primary Cell Portable Systems
• Battery Powered Medical Equipment
• Tiny, Low-Power IoT Sensors
• Low-Power Wireless Communication Products
• Secondary-Cell Portable Systems