LTC3736-2

PRODUCTION

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

Part Models: 4
1ku List Price: Starting From $4.55

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Overview

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.

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

Part Models: 4
1ku List Price: Starting From $4.55

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

Part Models	Product Lifecycle	PCN

Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking
		PCN24_0235_Form Material_Report Other Delta Qualification Matrix
LTC3736EGN-2#PBF	PRODUCTION
LTC3736EGN-2#TRPBF	PRODUCTION
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL
		PCN22_0177_Form Material_Report Delta Qualification Matrix
LTC3736EGN-2#PBF	PRODUCTION
LTC3736EGN-2#TRPBF	PRODUCTION
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3736EUF-2#PBF	PRODUCTION
LTC3736EUF-2#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

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Oscillators 2
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LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
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

Tools & Simulations

LTspice 1

LTC3736-2 Demo Circuit - Dual 2-Phase No Rsense Synchronous Controller with Output Tracking (3.3V to 2.5V @ 5A & 1.8V @ 5A)

Models for the following parts are available in LTspice:

LTC3736
LTC3736-1
LTC3736-2

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

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

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Product Details

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

DC922A - Design File
9/24/2009

DC922A - Schematic
9/24/2009

DC922A - Demo Manual
9/24/2009

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