LTC3100

PRODUCTION

1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO

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Overview

  • Extremely Compact Triple-Rail Solution
  • Burst Mode® Operation, IQ = 15μA
  • 1.5MHz Fixed Frequency Operation
  • Power Good Indicators
  • 700mA Synchronous Step-Up DC/DC
    • 0.65V to 5V VIN Range
    • 1.5V to 5.25V VOUT Range
    • 94% Peak Efficiency
    • VIN > VOUT Operation
    • Output Disconnect
  • 250mA Synchronous Step-Down DC/DC
    • 1.8V to 5.5V VIN Range
    • 0.6V to 5.5V VOUT Range
  • LDO (VIN Internally Tied to VBST)
    • 0.6V to 5.25V VOUT Range
    • 200mV Dropout Voltage at 100mA
  • Available in a 16-Lead 3mm × 3mm QFN Package

The LTC3100 combines a high efficiency 700mA synchronous step-up converter, a 250mA synchronous stepdown converter and a 100mA LDO regulator. The LTC3100 features a wide input voltage range of 0.65V to 5V. The step-down converter can be powered by the output of the step-up converter or from a separate power source between 1.8V and 5.5V. The LDO can also be used as a sequencing switch on the output of the boost.

A switching frequency of 1.5MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The switching regulators use current mode control and are internally compensated, reducing external parts count. Each converter automatically transitions to Burst Mode operation to maintain high efficiency over the full load range. Burst Mode operation can be disabled for low noise applications. The integrated LDO provides a third low noise, low dropout supply.

Anti-ringing circuitry reduces EMI by damping the boost inductor in discontinuous mode. Additional features include shutdown current of under 1μA and overtemperature shutdown. The LTC3100 is housed in a 16-lead 3mm × 3mm 0.75mm QFN package.

Applications

  • Bar Code Readers
  • Medical Instruments
  • Low Power Portable Electronic Devices
LTC3100
1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO
Two-Cell, Triple Output Converter Efficiency and Power Loss vs Load Current, VIN = 2.4V Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

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

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Supervisory Circuits & Reset ICs 1
LTC2935
PRODUCTION Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3100
LTspice

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

eval board
schematic 1
DC1326A

LTC3100EUD Demo Board | 1.5MHz Synchronous Dual-Channel DC/DC Converter and 100mA LDO

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Product Details

Demonstration circuit 1326A consists of three voltage regulators; a synchronous boost, a synchronous buck and a linear LDO. Jumpers are provided for selecting a total of nine output voltages (3 boost output voltages: 1.8V/3.3V/5V, 3 buck output voltages: 1.2V/1.5V/1.8V, and 3 LDO output voltages: 1.5V/2.85V/3V). The high efficiency DC/DC converters feature 700mA switches for the boost, 250mA for the buck and a 100mA rating for the LDO regulator. With a light load, the boost converter 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. That maximum boost and buck input voltage is 5.5V. The buck converter requires 1.8V minimum input.
DC1326A
LTC3100EUD Demo Board | 1.5MHz Synchronous Dual-Channel DC/DC Converter and 100mA LDO
DC1326A - Schematic

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