The LTC3528/LTC3528B are synchronous, fixed frequency step-up DC/DC converters with output disconnect. High efficiency synchronous rectification, in addition to a 700mV start-up voltage and operation down to 500mV once started, provides longer run-time for single or multiple cell battery-powered products. A switching frequency of 1MHz minimizes solution foot- print by allowing the use of tiny, low prole inductors and ceramic capacitors. The current mode PWM is internally compensated, simplifying the design process. The LTC3528EDDB-2 enters Burst Mode operation at light loads, while the LTC3528B features continuous switching at light loads. Anti-ringing circuitry reduces EMI by damping the inductor in discontinuous mode. Additional features include a low shutdown current, open-drain power good output, short- circuit protection and thermal overload protection. The LTC3528/LTC3528B are offered in an 8-lead 3mm x 2mm x 0.75mm DFN package.
FrequencyBurst ModeLTC35281MHzYesLTC3528B1MHzNo LTC3528-22MHzYesLTC3528B-2 2MHzNoFeature
- Delivers 3.3V at 200mA from a Single Alkaline/NiMH Cell or 3.3V at 400mA from Two Cells
- VIN Start-Up Voltage: 700mV
- 1.6V to 5.25V VOUT Range
- Up to 94% Efficiency
- Output Disconnect
- 1MHz Fixed Frequency Operation
- VIN > VOUT Operation
- Integrated Soft-Start
- Current Mode Control with Internal Compensation
- Burst Mode® Operation with 12µA Quiescent Current (LTC3528)
- Low Noise PWM Operation (LTC3528B)
- Internal Synchronous Rectier
- Logic Controlled Shutdown: <1µA
- Anti-Ringing Control
- Low Prole (3mm x 2mm x 0.75mm) DFN Package
Applications
- Medical Instruments
- Flash-Based MP3 Players
- Noise Canceling Headphones
- Wireless Mice
- Bluetooth Headsets
(Picture: Pinout)
