LTC3736-1

PRODUCTION

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

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Overview

  • Spread Spectrum Operation
  • Tracking Function
  • No Current Sense Resistors Required
  • Out-of-Phase Controllers Reduce Required
  • Input Capacitance
  • Wide VIN 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 VDS 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
LTC3736-1
Dual 2-Phase, No RSENSE™, Synchronous Controller with Spread Spectrum
Low Noise, 2-Phase, Dual Synchronous DC/DC Step-Down Converter Output Voltage Frequency Spectrum 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
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
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC3736
  • LTC3736-1
  • LTC3736-2
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
DC803A

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.
DC803A
LTC3736EUF-1 | 2-Phase, Spread Spectrum, 2.75V ≤ VIN ≤ 8V; VOUT1 = 2.5V @ 5A, VOUT2 = 1.8V @ 5A
DC803A - Schematic

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