LTC3772

PRODUCTION

Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller

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Overview

  • No Current Sense Resistor Required
  • 40µA No-Load Quiescent Current
  • High Output Currents Easily Achieved
  • Internal Soft-Start Ramps VOUT
  • Wide VIN Range: 2.75V to 9.8V
  • Low Dropout: 100% Duty Cycle
  • Constant Frequency 550kHz Operation
  • Low Ripple Burst Mode® Operation at Light Load
  • Output Voltage as Low as 0.8V
  • ±1.5% Voltage Reference Accuracy
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Only 8µA Supply Current in Shutdown
  • Low Profile 8-Lead SOT-23 (1mm) and (3mm × 2mm) DFN (0.75mm) Packages

The LTC3772 is a constant frequency current mode step-down DC/DC controller in a low profile 8-lead SOT-23 (ThinSOT™) and a 3mm × 2mm DFN package. The No RSENSE™ architecture eliminates the need for a current sense resistor, improving efficiency and saving board space.

The LTC3772 automatically switches into Burst Mode operation at light loads to increase efficiency at low output current. It consumes only 40µA of quiescent current under a no-load condition.

The LTC3772 incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2V. To maximize the runtime from a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High switching frequency of 550kHz allows the use of a small inductor and capacitors. An internal soft-start smoothly ramps the output voltage from zero to its regulation point.

Burst Mode
LTC3772 Yes
LTC3772B No

Applications

  • 1- or 2-Cell Li-Ion Battery-Powered Applications
  • Wireless Devices
  • Portable Computers
  • Distributed Power Systems
LTC3772
Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller
550kHz Micropower Step-Down DC/DC Converter Efficiency and Power Loss vs Load Current Product Package 1 Product Package 2
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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
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
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:

  • LTC3772
  • LTC3772B
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
DC836A

LTC3772EDDB Demo Board | VIN = 2.75V to 8V, VOUT = 1.8V/2.5V/3.3V @ 2A

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Product Details

Demonstration circuit 836 is a No RSENSE™ constant frequency step-down DC/DC converter featuring the LTC3772 Burst-Mode capable, nonsynchronous controller in a 3mm × 2mm DFN package. The demo board has an input voltage range of 2.75V to 8V and provides 2A at one of the three jumper-selectable output voltages: 1.8V, 2.5V or 3.3V.
DC836A
LTC3772EDDB Demo Board | VIN = 2.75V to 8V, VOUT = 1.8V/2.5V/3.3V @ 2A
DC836A - Schematic

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