LTC3527

PRODUCTION

Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters

Part Models: 4
1ku List Price: Starting From $3.22

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Overview

Dual Synchronous Step-Up DC/DC Converters
Delivers 3.3V at 200mA/100mA from one Alkaline/NiMH Cell, or 3.3V at 400mA/200mA from Two Cells
V_IN Start-Up Voltage: 700mV
0.5V to 5V V_IN Range After Start-Up
1.6V to 5.25V V_OUT Range
Output Disconnect in Shutdown
V_IN > V_OUT Operation
1.2MHz or 2.2MHz Operation
Up to 94% Efficiency
12μA Quiescent Current in Burst Mode^® Operation
Inrush Current Limiting and Soft-Start
Internal Synchronous Rectifiers
Logic-Controlled Shutdown (< 2μA)
Quick V_OUT Discharge (LTC3527-1)
16-Lead, 0.75mm × 3mm × 3mm QFN Package

The LTC3527/LTC3527-1 are dual high efficiency, step-up DC/DC converters in a space saving 16-lead 3mm × 3mm QFN package. Battery life is maximized with a 700mV startup voltage and operation down to 500mV once started. The SHDN and PGOOD pins enable the converters to be sequenced or started together.

The LTC3527/LTC3527-1 limit inrush current during startup. Selectable 1.2MHz or 2.2MHz operation provides a choice between the highest efficiency or smallest solution footprint. The current mode PWM design is internally compensated reducing external parts count. Burst Mode operation or fixed frequency operation is selectable via the MODE pin. Anti-ring circuitry reduces EMI in discontinuous mode. This device also features thermal shutdown.

True output disconnect allows the output to be completely open in shutdown. The LTC3527-1 actively discharges V_OUT1 or V_OUT2 when its respective SHDN goes low. Quiescent current in shutdown is less than 2μA.

Applications

MP3/Personal Media Players
Noise Canceling/Bluetooth Headsets
Wireless Mice
Portable Medical Instruments

Part Models: 4
1ku List Price: Starting From $3.22

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3527EUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3527EUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3527EUD-1#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3527EUD-1#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice 1

LTC3527 Demo Circuit - Dual 800mA/400mA 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converter (0.7-5.5V to 3.3V @ 150mA & 1.8V @ 150mA)

Models for the following parts are available in LTspice:

LTC3527
LTC3527-1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LTC3527EUD Demo Board | Dual, 1.2MHz or 2.2MHz, 0.5V ≤ VIN ≤ 5V, VOUT1 = 3V/3.3V/5V(800mA Switch), VOUT2 = 1.8V/2.85V/3.3V(400mA Switch)

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Product Details

Demonstration circuit 1237A-A (LTC3527) and 1237A-B (LTC3527-1) are dual output, high-efficiency synchronous boost converter demo boards with each having an 800mA and a 400mA power switch. With a light load, the boost converters can startup with an input voltage as low as 700mV and once started, the input can go as low as 500mV while maintaining a regulated output voltage. Jumpers set the output voltages to one of three options for each output: 3V, 3.3V or 5V for V_OUT1, and 1.8V, 2.85V or 3.3V for V_OUT2. The devices can provide 200mA at 3.3V from a 1.5V input. The LTC3527-1 actively discharges V_OUT1 or V_OUT2 when the respective SHDN pin goes low.