Power Electronics

Synchronous Boost Regulator Maximizes Battery Life

Linear Technology’s LTC3527/-1 dual-output synchronous boost regulators integrate 800-mA and 400-mA switches that generate outputs as high as 5.25 V from an input as low as 0.70 V (or 0.5 V after startup). The regulators’ ability to start up and run off low voltages helps to extend battery life in portable applications.

Device type: synchronous boost regulator
Features: dual output, output disconnect in shutdown, current-mode control, quick VOUT discharge (-1 model), and shutdown and power-good pins
Protection features: inrush current limiting, anti-ringing control, short-circuit protection and thermal protection.
Input voltage range: 5 V down to 0.70 V (or 0.5 V when running)
Output voltage range: 1.6 V to 5.25 V
Switching frequency: Selectable 1.2-MHz or 2.2-MHz operation
Efficiency: Up to 94%
Quiescent current: 12 µA in burst-mode operation; less than 2 µA in shutdown
Operating temperature range:-40ºC to 125ºC
Packaging: 16-lead, 3-mm x 3-mm-QFN
Target applications: Battery power applications including those using Li-ion and Li-polymer, single or multicell alkaline and NiMH batteries.
Pricing: starts at $2.95 each in quantities of 1000
Availability: available now
Data sheet posted on web? yes, see

Notes: The LTC3527/-1 can deliver up to 200 mA and 100 mA of continuous output at 3.3 V when operating from a single alkaline cell, or 400 mA and 200 mA of continuous output from dual alkaline cells. The chips can regulate output voltage even when VIN exceeds VOUT, further extending battery run time.

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