LTC3537

RECOMMENDED FOR NEW DESIGNS

2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO

Data Sheet Product Selection Table

Part Models: 2
1ku List Price: Starting From $2.90

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Overview

High Efficiency Step-Up DC/DC Converter and LDO

Step-Up

V_IN: 0.68V to 5V, V_OUT: 1.5V to 5.25V
I_OUT: 100mA at 3.3V, V_IN >0.8V
2.2MHz Fixed Frequency Operation
Synchronous Rectifier with Output Disconnect
Burst Mode Operation (Pin Selectable)

Linear LDO Regulator

V_IN : 1.8V to 5.5V, V_OUT: 0.6V to 5V
I_OUT: 100mA
100mV Dropout Voltage at 50mA
24dB Ripple Rejection at f_SW

Combined

Power Good Indicators
Low-Battery Comparator
30μA I_Q
Low Proﬁle 3mm × 3mm × 0.75mm Package

The LTC3537 combines a high efficiency, 2.2MHz step-up DC/DC converter with an independent 100mA low dropout regulator (LDO). The step-up converter starts from an input voltage as low as 0.68V and contains an internal 0.4Ω switch and a 0.6Ω synchronous rectifier that disconnects from the output when disabled in shutdown.

A switching frequency of 2.2MHz 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. Fixed frequency switching is maintained until a light load current is sensed, at which point Burst Mode^® operation is engaged to maximize efficiency. For low noise operation, Burst Mode Operation can be disabled. Anti-ring circuitry reduces EMI by damping the inductor in discontinuous mode. Additional features include a low shutdown current of under 1μA and thermal overload protection.

The integrated LDO regulator provides a very low noise, programmable low dropout supply.

Applications

Wireless Microphones
Portable Medical instruments
Noise Cancelling/Portable Headsets
RF and Audio Power

Part Models: 2
1ku List Price: Starting From $2.90

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
LTC3537EUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3537EUD#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

Models for the following parts are available in LTspice:

LTC3537

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.