LTC3836

PRODUCTION

Dual 2-Phase, No RSENSE™ Low VIN Synchronous Controller

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Overview

  • No Current Sense Resistors Required
  • Out-of-Phase Controllers Reduce Required Input Capacitance
  • All N-Channel Synchronous Drive
  • VIN Range: 2.75V to 4.5V
  • Constant-Frequency Current Mode Operation
  • 0.6V ±1.5% Voltage Reference
  • Low Dropout Operation: 97% Duty Cycle
  • True PLL for Frequency Locking or Adjustment
  • Selectable Pulse-Skipping/Continuous Operation
  • Tracking Function
  • Internal Soft-Start Circuitry
  • Power Good Output Voltage Monitor
  • Output Overvoltage Protection
  • Micropower Shutdown: IQ = 6.5µA
  • Tiny Low Profile (4mm × 5mm) QFN and Narrow SSOP Packages

The LTC3836 is a 2-phase dual output synchronous step-down switching regulator controller with tracking that drives external N-channel 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. The 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. The 97% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems.

The operating frequency is selectable from 300kHz to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3836 operating frequency can be externally synchronized from 250kHz to 850kHz.

The LTC3836 features an internal 1ms soft-start that can be extended with an external capacitor. A tracking input allows the second output to track the first during start-up.

The LTC3836 is available in the tiny thermally enhanced (4mm × 5mm) QFN and 28-lead narrow SSOP packages.

Applications

  • General Purpose 3.3V to 1.X Supplies
  • Single Lithium-Ion Powered Devices
  • Distributed DC Power Systems
LTC3836
Dual 2-Phase, No RSENSE™ Low VIN Synchronous Controller
High Efficiency, 2-Phase, Dual Synchronous DC/DC Step-Down Converter Efficiency/Power Loss vs Load Current Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 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
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

Models for the following parts are available in LTspice:

  • LTC3836
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
DC1107A

LTC3836EUFD Demo Board | 2-Phase, 2.75V to 4.5V Input, VOUT1 = 1.8V @ 7A, VOUT2 = 1.2V @ 7A

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Product Details

Demonstration circuit 1107 is a 2-phase dual high efficiency synchronous step-down DC/DC converter that features the LTC3836EUFD controller. It operates with a 2.75V to 4.5V input range. and has two outputs: 1.8V @ 7A and 1.2V @ 7A.


 


eval board
schematic 2
DC1081A

LTC3836EUFD Demo Board | 2-Phase, 2.75V to 4.5V Input, VOUT1 = 1.8V @ 12A, VOUT2 = 1.2V @ 12A

Buy Now View Details

Product Details

Demonstration circuit DC1081 is a dual-output low VIN step-down power supply featuring the LTC3836, a low quiescent current, 2-phase synchronous buck controller. The input voltage is from 2.75V to 4.5V. The demo board has two outputs: 1.8V/12A and 1.2V/12A.
DC1107A
LTC3836EUFD Demo Board | 2-Phase, 2.75V to 4.5V Input, VOUT1 = 1.8V @ 7A, VOUT2 = 1.2V @ 7A
DC1107A - Schematic
DC1081A
LTC3836EUFD Demo Board | 2-Phase, 2.75V to 4.5V Input, VOUT1 = 1.8V @ 12A, VOUT2 = 1.2V @ 12A
DC1081A - Schematic

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