LTC3822

PRODUCTION

No RSENSE™, Low Input Voltage, Synchronous Step-Down DC/DC Controller

Data Sheet Product Selection Table
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Overview

  • No Current Sense Resistor Required
  • All N-Channel MOSFET Synchronous Drive
  • High Current Outputs Possible
  • Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
  • VIN: 2.75V to 4.5V
  • ±1% 0.6V Reference
  • Low Dropout Operation: 99% Duty Cycle
  • Selectable Frequency (300kHz/550kHz/750kHz)
  • Internal Soft-Start Circuitry
  • Selectable Maximum Peak Current Sense Threshold
  • Digital RUN Control Pin
  • Output Overvoltage Protection
  • Micropower Shutdown: IQ = 7.5µA
  • Tiny Thermally Enhanced Leadless (3mm × 3mm) DFN or 10-Lead MSOP Package

The LTC3822 is a synchronous step-down switching regulator controller 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.

A maximum duty cycle of 99% provides low dropout operation. The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors.

The LTC3822 is available in thermally enhanced DFN and 10-lead MSOP packages.

Features
LTC3822 Internal soft-start, 340μA in sleep mode
LTC3822-1 External soft start, selectable pulse skip/Burst Mode operation, tracking, phase lockable, power good (SSOP-16 package only), 105μA in sleep mode

Applications

  • 3.3VIN Systems
  • Li-Ion Battery Systems
LTC3822
No RSENSE™, Low Input Voltage, Synchronous Step-Down DC/DC Controller
1.8V/8A High Efficiency, 550kHz Step-Down Converter Efficiency and 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

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
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:

  • LTC3822
  • LTC3822-1
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
DC972A

LTC3822EDD Demo Board (DFN) | 2.75V ≤ VIN ≤ 4.5V, VOUT = 1.8V @ 8A

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Product Details

Demonstration circuit 972A is a high efficiency synchronous step-down DC/DC converter featuring the LTC3822EDD controller and dual N-Channel MOSFETs. The demo board is capable of providing 1.8V/8A from a 2.75V to 4.5V input.

eval board
schematic 2
DC1014A

LTC3822EMSE (MSOP) Demo Board | 2.75V ≤ VIN ≤ 4.5V, VOUT = 1.8V @ 10A

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Product Details

Demonstration circuit 1014A is a high efficiency synchronous step-down DC/DC converter featuring the LTC3822EMSE controller in the exposed pad MSOP package. The demo board is capable of providing 1.8V/10A from a 2.75V to 4.5V input.
DC972A
LTC3822EDD Demo Board (DFN) | 2.75V ≤ VIN ≤ 4.5V, VOUT = 1.8V @ 8A
DC972A - Schematic
DC1014A
LTC3822EMSE (MSOP) Demo Board | 2.75V ≤ VIN ≤ 4.5V, VOUT = 1.8V @ 10A
DC1014A - Schematic

Latest Discussions

5 Years Ago
The output voltage of LTC3822-1 is low
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