LTC3736-2

PRODUCTION

LTC3736-2

Dual 2-Phase, No R_SENSE^™, Synchronous Controller with Output Tracking

PRODUCTION

High Efﬁciency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter slide

Efﬁciency and Power Loss vs Load Current (Figure 15 Circuit) slide

High Efﬁciency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter

Efﬁciency and Power Loss vs Load Current (Figure 15 Circuit)

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Part Models 4

1ku List Price Starting From $4.55

Features

No Current Sense Resistors Required
Out-of-Phase Controllers Reduce Required Input Capacitance
Tracking Function
Wide V_IN Range: 2.75V to 9.8V
0.6V ±1% Voltage Reference
High Current Limit
Constant Frequency Current Mode Operation
Low Dropout Operation: 100% Duty Cycle
True PLL for Frequency Locking or Adjustment
Selectable Pulse Skipping/Forced Continuous Operation
Auxiliary Winding Regulation
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: I_Q = 9μA
Tiny Low Profile (4mm × 4mm) QFN and narrow SSOP packages.

Additional Details

The LTC3736-2 is a 2-phase dual synchronous step-down switching regulator controller with tracking that drives external complementary power MOSFETs using few external components. The constant-frequency current mode architecture with MOSFET V_DS sensing eliminates the need for sense resistors and improves efficiency. Power loss and noise due to the ESR of the input capacitance are minimized by operating the two controllers out-of-phase.

Pulse-skipping operation provides high efficiency at light loads. 100% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems.

The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3736-2 switching frequency can be externally synchronized from 250kHz to 850kHz. An internal soft-start, which can be lengthened externally, smoothly ramps the output voltage during start-up.

The LTC3736-2 is available in the tiny thermally enhanced (4mm × 4mm) QFN and 24-lead narrow SSOP packages.


	Max Current Sense Voltage	Burst Mode	Soft Start	Spread Spectrum
LTC3736	204mV	Yes	No	No
LTC3736-1	204mV	No	No	Yes
LTC3736-2	345mV	No	Yes	No

Applications

One or Two Lithium-Ion Powered Devices
Notebook and Palmtop Computers, PDAs
Portable Instruments
Distributed DC Power Systems

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 4

1ku List Price Starting From $4.55

Technical Documents 3

LTC3736-2: Dual 2-Phase, No R_SENSE Synchronous Controller with Output Tracking Data Sheet 01/20/2009

R421 Reliability Data 03/23/2018

DC922A - Demo Manual 09/24/2009

Design Resources 4

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
LTC3736EGN-2#PBF	24-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3736EGN-2#TRPBF	24-Lead SSOP (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3736EUF-2#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3736EUF-2#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3736EGN-2#PBF
Pin/Package Drawing
24-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3736EGN-2#TRPBF
Pin/Package Drawing
24-Lead SSOP (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3736EUF-2#PBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3736EUF-2#TRPBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 3, 2024

- 24_0235

(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

LTC3736EGN-2#PBF

PRODUCTION

LTC3736EGN-2#TRPBF

PRODUCTION

pdf

PCN24_0235_Form

xls

Material_Report

pdf

Other

xlsm

Delta Qualification Matrix

Aug 10, 2022

- 22_0177

Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

LTC3736EGN-2#PBF

PRODUCTION

LTC3736EGN-2#TRPBF

PRODUCTION

pdf

PCN22_0177_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3736EUF-2#PBF

PRODUCTION

LTC3736EUF-2#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 3, 2024

- 24_0235

(QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking

LTC3736EGN-2#PBF

PRODUCTION

LTC3736EGN-2#TRPBF

PRODUCTION

pdf

PCN24_0235_Form

xls

Material_Report

pdf

Other

xlsm

Delta Qualification Matrix

Aug 10, 2022

- 22_0177

Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

LTC3736EGN-2#PBF

PRODUCTION

LTC3736EGN-2#TRPBF

PRODUCTION

pdf

PCN22_0177_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3736EUF-2#PBF

PRODUCTION

LTC3736EUF-2#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

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DC922A

LTC3736EUF-2 Demo Board | 2-Phase, 2.7V ≤ VIN ≤ 8V, VOUT1 = 2.5V @ 5A, VOUT2 = 1.8V @ 5A

DC922A

LTC3736EUF-2 Demo Board | 2-Phase, 2.7V ≤ VIN ≤ 8V, VOUT1 = 2.5V @ 5A, VOUT2 = 1.8V @ 5A

Buy Now View Details

Product Detail

Demonstration circuit 922 is a 2-phase dual synchronous high efficiency step-down DC/DC converter featuring the LTC3736EUF-2 controller.The "-2" version features pulse-skipping (in place of Burst Mode operation) at light loads and has a tighter voltage reference accuracy over temperature when compared with the LTC3736 "plain" version. The demo board operates with a 2.7V to 8V input voltage range and provides outputs of 2.5V@5A and 1.8V@5A.

Resources

PDF

DC922A - Schematic

31.00K

ZIP

DC922A - Design File

616.00K

PDF

DC922A - Demo Manual

393.00K

DC922A

LTC3736EUF-2 Demo Board | 2-Phase, 2.7V ≤ VIN ≤ 8V, VOUT1 = 2.5V @ 5A, VOUT2 = 1.8V @ 5A

LTspice 1

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To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.