Power Management Switching Regulator Step-Down (Buck) Regulators External Power Switch Buck Controllers

LTC2974 - 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement

LTC3880 - Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

LTC3772B - Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller

Features

  • No Current Sense Resistor Required
  • 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 Pulse Skipping 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

Typical Application

LTC3772B Typical Application
LTC3772B Typical Application

Description

The LTC3772B 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 LTC3772B automatically switches into pulse skipping operation at light loads. It consumes only 200μA of quiescent current under a no-load condition.

The LTC3772B 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

SOT-23, DFN-8

LTC3772B Package Drawing
LTC3772B Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3772BEDDB DFN 8 E $2.73 View
LTC3772BEDDB#PBF DFN 8 E $2.73 View
LTC3772BEDDB#TR DFN 8 E $2.73 $1.91 View
LTC3772BEDDB#TRM DFN 8 E $2.73 $1.93 View
LTC3772BEDDB#TRMPBF DFN 8 E $2.73 $1.93 View
LTC3772BEDDB#TRPBF DFN 8 E $2.73 $1.91 View
LTC3772BETS8 SOT 8 E $2.71 View
LTC3772BETS8#PBF SOT 8 E $2.73 View
LTC3772BETS8#TR SOT 8 E $2.71 $1.91 View
LTC3772BETS8#TRM SOT 8 E $2.71 $1.93 View
LTC3772BETS8#TRMPBF SOT 8 E $2.71 $1.93 View
LTC3772BETS8#TRPBF SOT 8 E $2.71 $1.91 View
LTC3772EDDB DFN 8 E $2.73 View
LTC3772EDDB#PBF DFN 8 E $2.73 View
LTC3772EDDB#TR DFN 8 E $2.73 $1.91 View
LTC3772EDDB#TRM DFN 8 E $2.73 $1.93 View
LTC3772EDDB#TRMPBF DFN 8 E $2.73 $1.93 View
LTC3772EDDB#TRPBF DFN 8 E $2.73 $1.91 View
LTC3772ETS8 SOT 8 E $2.71 View
LTC3772ETS8#PBF SOT 8 E $2.73 View
LTC3772ETS8#TR SOT 8 E $2.71 $1.91 View
LTC3772ETS8#TRM SOT 8 E $2.71 $1.93 View
LTC3772ETS8#TRMPBF SOT 8 E $2.71 $1.93 View
LTC3772ETS8#TRPBF SOT 8 E $2.71 $1.91 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • 1- or 2-Cell Li-Ion Battery-Powered Applications
  • Wireless Devices
  • Portable Computers
  • Distributed Power Systems

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Related models available in LTspice IV
LTC3772
LTC3772B

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