Power Electronics

Boost Regulator

Linear Technology’s LTC3429 is a 500-kHz current mode, synchronous boost dc-dc converter with true output disconnect, inrush current limiting and integrated soft-start capability. Its internal 0.35 Ω (N-Channel) and 0.45 Ω (P-Channel) switches provide a guaranteed 600 mA current limit and can deliver an output voltage as high as 5 V from an input voltage range of 0.5 V to 4.4 V, making it suitable for Li-Ion and single or multicell alkaline/NiMH applications.

The LTC3429 can deliver up to 100 mA of continuous output current (at 3.3 V) from a single alkaline cell. Synchronous rectification enables efficiencies of up to 96% while Burst Mode operation lowers quiescent current to only 20 µA, providing maximum battery run time in handheld applications. A constant switching frequency of 500 kHz minimizes both inductor and capacitor sizes, providing a tiny solution footprint required in handheld applications. The true output disconnect feature allows the output to be completely discharged in shutdown. It also limits inrush current during start-up, minimizing surge currents seen by the input supply. Additional features include anti-ringing control, short-circuit protection, soft-start and thermal protection.

The LTC3429 delivers an ideal solution for boost applications that require up to 200 mA of output current and where a small solution size and low maximum battery run-time are defining factors.

For more information, visit www.linear.com.

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