500mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN

The LTC3526/LTC3526B are synchronous, fixed frequency step-up DC/DC converters with output disconnect. Synchronous rectification enables high efficiency in the low profile 2mm × 2mm DFN package. Battery life in single AA/AAA powered products is extended further with an 850mV start-up voltage and operation down to 500mV once started.

A switching frequency of 1MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing external parts count. The LTC3526 features automatic Burst Mode operation at light load conditions, while the LTC3526B features continuous switching at light loads. Anti-ringing control circuitry also reduces EMI concerns by damping the inductor in discontinuous mode. Additional features include a low shutdown current of under 1μA and thermal shutdown.

The LTC3526/LTC3526B are housed in a 2mm × 2mm × 0.75mm DFN package.

For new designs, we recommend the LTC3526L/LTC3526LB.

Startup Voltage

Frequency

Burst Mode

Notes

LTC3526

1V

1MHz

Yes

Not Recommended For New Designs

LTC3526B

1V

1MHz

No

Not Recommended For New Designs

LTC3526-2

1V

2MHz

Yes

Not Recommended For New Designs

LTC3526B-2

1V

2MHz

No

Not Recommended For New Designs

LTC3526L

0.85V

1MHz

Yes

LTC3526LB

0.85V

1MHz

No

LTC3526L-2

0.85V

2MHz

Yes

LTC3526LB-2

0.85V

2MHz

No

APPLICATIONS

* Medical Instruments

* Flash-Based MP3 Players

* Noise Canceling Headphones

* Wireless Mice

* Bluetooth Headsets

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

* VIN Start-Up Voltage: 850mV

* 1.6V to 5.25V VOUT Range

* Up to 94% Efficiency

* Output Disconnect

* 1MHz Fixed Frequency Operation

* VIN > VOUT Operation

* Integrated Soft-Start