LTC3736

PRODUCTION

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

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Overview

  • No Current Sense Resistors Required
  • Out-of-Phase Controllers Reduce Required Input Capacitance
  • Tracking Function
  • Wide VIN Range: 2.75V to 9.8V
  • Constant Frequency Current Mode Operation
  • 0.6V ±1.5% Voltage Reference
  • Low Dropout Operation: 100% Duty Cycle
  • True PLL for Frequency Locking or Adjustment
  • Selectable Burst Mode®/Forced Continuous Operation
  • Auxiliary Winding Regulation
  • 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 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 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.

Burst Mode 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 switching frequency can be externally synchronized from 250kHz to 850kHz. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low in order to reduce noise and RF interference. Automatic softstart is internally controlled.

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

Protected by U.S. Patents including 5481178, 5929620, 6144194, 6580258, 6304066, 6611131, 6498466.

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

Applications

  • One or Two Lithium-Ion Powered Devices
  • Notebook and Palmtop Computers, PDAs
  • Portable Instruments
  • Distributed DC Power Systems
LTC3736
Dual 2-Phase, No RSENSE™, Synchronous Controller with Output Tracking
High Efficiency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter Efficiency vs Load Current Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 2

Technical Articles 2

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
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Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
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PRODUCTION 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Power System Management (PSM) & Sequencers 1
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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

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
DC663A

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

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Product Details

Demonstration circuit 663 is a 2-phase dual synchronous high efficiency step-down DC/DC converter featuring the LTC3736EUF controller. The LTC3736 features Burst Mode operation at light loads. The demo board operates with a 2.7V to 8V input voltage range and provides outputs of 2.5V@5A and 1.8V@5A.


 
DC663A
LTC3736EUF Demo Board | 2-Phase, 2.7V ≤ VIN ≤ 8V, VOUT1 = 2.5V @ 5A, VOUT2 = 1.8V @ 5A
DC663A - Schematic

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