LTC3736-1

PRODUCTION

Dual 2-Phase, No R_SENSE^™, Synchronous Controller with Spread Spectrum

Part Models: 4
1ku List Price: Starting From $5.83

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Part Details

Spread Spectrum Operation
Tracking Function
No Current Sense Resistors Required
Out-of-Phase Controllers Reduce Required
Input Capacitance
Wide V_IN Range: 2.75V to 9.8V
Current Mode Operation
0.6V ±1.5% Voltage Reference
Low Dropout Operation: 100% Duty Cycle
Pulse Skipping Operation at Light Loads
Internal Soft-Start Circuitry
Power Good Output Voltage Monitor
Output Overvoltage Protection
Micropower Shutdown: IQ = 9µA
Tiny Low Profile (4mm × 4mm) QFN and Narrow SSOP Packages

The LTC3736-1 is a 2-phase dual synchronous stepdown 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.

A unique spread spectrum architecture randomly varies the LTC3736-1’s switching frequency from 450kHz to 580kHz, significantly reducing the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.

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 high switching frequencies allow for the use of small surface mount inductors and capacitors.

The LTC3736-1 is available in the low profile (0.75mm) 24-pin thermally enhanced (4mm × 4mm) QFN package 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 $5.83

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-1#PBF	24-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3736EGN-1#TRPBF	24-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3736EUF-1#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3736EUF-1#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

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-1#PBF	PRODUCTION
LTC3736EGN-1#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-1#PBF	PRODUCTION
LTC3736EUF-1#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
Oscillators 2
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
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 2

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-1 | 2-Phase, Spread Spectrum, 2.75V ≤ VIN ≤ 8V; VOUT1 = 2.5V @ 5A, VOUT2 = 1.8V @ 5A

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Product Details

Demonstration circuit 803 is a 2-phase dual synchronous high efficiency step-down DC/DC converter featuring the LTC3736EUF-1 controller.The "-1" version features pulse-skipping (in place of Burst Mode operation) at light loads and optional spread spectrum frequency modulation, and has a tighter voltage reference accuracy over temperature when compared with the LTC3736 "plain" version. The demo board operates with a 2.75V to 8V input voltage range and provides outputs of 2.5V @ 5A and 1.8V @ 5A.

Resources

DC803A - Demo Manual
9/24/2009

DC803A - Design File
9/24/2009

DC803A - Schematic
9/24/2009

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Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1