This reference design boosts a single-cell battery voltage to a 10W output using the MAX669 controller in the bootstrapped mode. The bootstrap on the input allows the circuit to continue regulating for very low-input voltages.
This circuit boosts to 12V, 0.833A on the output for a 2.6V to 4.5V input. The MAX669 IC in this design is a constant-frequency, pulse-width modulating (PWM), and current-mode DC-DC controller. It can be used for a wide range of DC-DC conversion applications including step-up, SEPIC, flyback, and isolated-output configurations. Power levels of 20W or more can be controlled with conversion efficiencies of over 90%.
Key Features
Tiny 10-pin μMAX package
Low-input voltage range
Current-mode PWM and idle-mode operation
220μA quiescent current
Logic-level shutdown
Soft-start
High efficiency
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