500 mA step-down DC/DC integrates backup battery switching
MAX77756 is a synchronous 500 mA step-down DC-DC converter with integrated dual-input power multiplexer (MUX). The converter operates on an input supply as low as 3.0V and as high as 24V. Default output voltage is factory-programmed to either 1.8V, 3.3V, or 5.0V. Output voltage is further adjustable through external resistors or an I2C serial interface.
The dual-input power MUX selects the higher voltage from two different input sources to power the step-down converter. Control circuitry ensures that only one channel of the MUX is on at any time, to prevent cross-conduction between input sources. For single-input applications, the MUX can be bypassed and the step-down converter can be powered directly from the SUP pin.
The MAX77756 is available in a 2.33 × 1.42 mm (0.7 mm max height), 15-bump wafer-level package (WLP). For a similar buck converter without a power MUX, the company offers the MAX77596.
An evaluation kit/board is available; the fully assembled and tested PCB demonstrates the MAX77756 synchronous 500 mA step-down converter. The EV kit allows for easy evaluation of the IC’s input power multiplexer and step-down converter. A dual-range (8 mA and 800 mA full scale) electronic load is included on the EV kit for buck converter load control. Windows-based software provides a user-friendly graphical user interface (GUI), as well as a detailed register-based interface to exercise the features of the IC.
Maxim Integrated; www.maximintegrated.com/en/products/MAX77756
next page; feature list…
MAX 77756
Wide input power supply
3V to 24V supply voltage
500 mA (max) output current
1.8V, 3.3V, or 5.0V factory-set VOUT options or external feedback resistor option
Optional I2C control for fine VOUT adjustment (1.5V to 7.5V in 50 mV steps)
Hardware or software enable
Dual-Input power MUX replaces common-cathode diode arrays
Automatic ideal-diode ORing voltage selector
250 mΩ MOSFETs minimize power consumption, BOM, and solution size
Low IQ enables always-on rails
1.5 µA quiescent current (only SUP powered)
19 µA quiescent current (IN1/IN2 powered)
88% peak efficiency (12VSUP, 3.3VOUT)
Safe and easy to use
Short-circuit and thermal protection
8 msec soft-start
Software-enabled spread spectrum
Pin-programmable inductor peak current level
Small size
2.33 × 1.42 mm (0.7 mm max height) wafer-level package (WLP)
15-bump, 0.4 mm pitch, 3 × 5 array
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