Dual-channel 1 MHz synchronous boost regulator offers integrated output disconnect and soft-start

Linear Technology Corporation has introduced the LTC3535, a dual-channel 1 MHz, current mode synchronous boost DC/DC converter with integrated output disconnect and soft-start.

The LTC3535's internal 550 mA switches deliver output voltages as high as 5.25 V from an input voltage range of 0.7 V start-up, 0.5 V when running to 5 V, making it ideal for single- or multicell alkaline/NiMH as well as Li-Ion/Polymer applications.

Each of the LTC3535's channels has it own power input and is completely independent, offering maximum design flexibility. For example, one channel can deliver up to 50 mA of continuous output current at 3.3 V while the other channel delivers up to 100 mA at 1.8 V to power a microcontroller from a single alkaline cell. The 1 MHz switching frequency minimizes external component sizes while providing up to 94 percent efficiency. Combined with a compact 3 mm x 3 mm DFN-12 package, the LTC3535 dual channel boost provides the tiny and efficient solution footprint required in handheld applications.

Burst Mode operation lowers quiescent current to only 18 uA (both channels), providing extended battery run time in handheld applications. The LTC3535 is an ideal part for handheld dual boost applications in which small solution size and maximum battery run time are defining factors.

Features of the LTC3535

Two Independent Step-Up Converters

Each Channel Delivers 3.3 V at 100 mA from a Single
Alkaline/NiMH Cell or 3.3 V at 200 mA from Two Cells

Minimum VIN Start-Up Voltage: 680 mV

1.5 V to 5.25 V VOUT Range

Up to 94 percent Efficiency

Output Disconnect

1MHz Fixed Frequency Operation

VIN > VOUT Operation

Integrated Soft-Start

Current Mode Control with Internal Compensation

Burst Mode Operation with 9 uA IQ Each Channel

Internal Synchronous Rectifier

Logic Controlled Shutdown (IQ <1 uA)

Anti-Ring Control

Low Profile (3mm x 3 mm x 0.75 mm) 12-Lead DFN

Availability and Pricing

LTC3535EDD is available from stock in 12-lead 3 mm x 3 mm DFN package. 1,000-piece pricing starts at $2.95 each.

Datasheet for: LTC3535

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