LTC3833

RECOMMENDED FOR NEW DESIGNS

Fast Accurate Step-Down DC/DC Controller with Differential Output Sensing

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Overview

  • Wide VIN Range: 4.5V to 38V
  • VOUT Range: 0.6V to 5.5V
  • Output Accuracy: ±0.25% at 25°C and ±0.67% over Temperature
  • Differential Output Sensing Allowing Up to 500mV Line Loss
  • Fast Load Transient Response
  • tON(MIN) = 20ns, tOFF(MIN) = 90ns
  • Controlled On-Time Valley Current Mode Architecture
  • Frequency Programmable from 200kHz to 2MHz and Synchronizable to External Clock
  • RSENSE or Inductor DCR Current Sensing
  • Overvoltage Protection and Current Limit Foldback
  • Power Good Output Voltage Monitor
  • Output Tracking or Adjustable Soft-Start
  • External VCC Input for Bypassing Internal LDO
  • 20-Pin QFN (3mm × 4mm) and TSSOP Packages
LTC3833
Fast Accurate Step-Down DC/DC Controller with Differential Output Sensing
1.5V, 20A, 300kHz High Current Step-Down Converter Efficiency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

User Guide 2

Application Note 3

Technical Articles 4

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
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Hot Swap Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
Ideal Diodes and PowerPath Controllers 1
LTC4359
RECOMMENDED FOR NEW DESIGNS Ideal Diode Controller with Reverse Input Protection
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC3833

LTpowerCAD 4

Design tools for the following parts are available in LTpowerCAD:

  • LTC3833
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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
DC1640A-A

LTC3833EUDC Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 20A, Inductor DCR Sensing

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Product Details

Demonstration circuit 1640A is a 1.5V/20A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 14V. The demo board comes in two versions. The A version uses inductor DCR current sensing with an iron powder inductor for high efficiency. The B version uses a 2mΩ /1% sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode topology of the LTC3833 allows for a fast load step response.

eval board
schematic 2
DC1640A-A

LTC3833EUDC Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 20A, Inductor DCR Sensing

Buy Now View Details

Product Details

Demonstration circuit 1640A is a 1.5V/20A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 14V. The demo board comes in two versions. The A version uses inductor DCR current sensing with an iron powder inductor for high efficiency. The B version uses a 2mΩ /1% sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode topology of the LTC3833 allows for a fast load step response.

eval board
schematic 3
DC1640A-B

LTC3833EUDC Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 20A, RSENSE

Buy Now View Details

Product Details

Demonstration circuit 1640A is a 1.5V/20A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 14V. The demo board comes in two versions. The A version uses inductor DCR current sensing with an iron powder inductor for high efficiency. The B version uses a 2mΩ /1% sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode topology of the LTC3833 allows for a fast load step response.

eval board
schematic 4
DC1640A-B

LTC3833EUDC Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 20A, RSENSE

Buy Now View Details

Product Details

Demonstration circuit 1640A is a 1.5V/20A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 14V. The demo board comes in two versions. The A version uses inductor DCR current sensing with an iron powder inductor for high efficiency. The B version uses a 2mΩ /1% sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode topology of the LTC3833 allows for a fast load step response.

eval board
schematic 5
schematic 6
schematic 7
schematic 8
DC1516A-A

LTC3833EFE Demo Board | VIN = 4.5V to 24V, VOUT1 = 1.5V @ 15A, Inductor DCR Sensing, 89.4% Efficiency

Buy Now View Details

Product Details

Demonstration circuit 1516A is a 1.5V/15A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 24V. The demo board comes in two versions. The -A version uses inductor DCR current sensing with an iron powder inductor for highest efficiency. The -B version uses a 2.5mΩ/1% sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode control of the LTC3833 allows for a fast load step response.

eval board
schematic 9
schematic 10
schematic 11
schematic 12
DC1516A-A

LTC3833EFE Demo Board | VIN = 4.5V to 24V, VOUT1 = 1.5V @ 15A, Inductor DCR Sensing, 89.4% Efficiency

Buy Now View Details

Product Details

Demonstration circuit 1516A is a 1.5V/15A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 24V. The demo board comes in two versions. The -A version uses inductor DCR current sensing with an iron powder inductor for highest efficiency. The -B version uses a 2.5mΩ/1% sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode control of the LTC3833 allows for a fast load step response.

eval board
schematic 13
DC1516A-B

LTC3833EFE Demo Board | VIN = 4.5V to 24V, VOUT1 = 1.5V @ 15A, RSENSE

Buy Now View Details

Product Details

Demonstration circuit 1516A is a 1.5V/15A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 24V. The demo board comes in two versions. The -A version uses inductor DCR current sensing with an iron powder inductor for highest efficiency. The -B version uses a 2.5mΩ/1% sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode control of the LTC3833 allows for a fast load step response.

eval board
schematic 14
DC1516A-B

LTC3833EFE Demo Board | VIN = 4.5V to 24V, VOUT1 = 1.5V @ 15A, RSENSE

Buy Now View Details

Product Details

Demonstration circuit 1516A is a 1.5V/15A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 24V. The demo board comes in two versions. The -A version uses inductor DCR current sensing with an iron powder inductor for highest efficiency. The -B version uses a 2.5mΩ/1% sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode control of the LTC3833 allows for a fast load step response.
DC1640A-A
LTC3833EUDC Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 20A, Inductor DCR Sensing
DC1640A-B - Schematic
DC1640A-A
LTC3833EUDC Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 20A, Inductor DCR Sensing
DC1640A-B - Schematic
DC1640A-B
LTC3833EUDC Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 20A, RSENSE
DC1640A-B - Schematic
DC1640A-B
LTC3833EUDC Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT = 1.5V @ 20A, RSENSE
DC1640A-B - Schematic
DC1516A-A
LTC3833EFE Demo Board | VIN = 4.5V to 24V, VOUT1 = 1.5V @ 15A, Inductor DCR Sensing, 89.4% Efficiency
DC1516A-A Evaluation Board DC1516A-A Evaluation Board - Top View DC1516A-A Evaluation Board - Bottom View DC1516A-A - Schematic
DC1516A-A
LTC3833EFE Demo Board | VIN = 4.5V to 24V, VOUT1 = 1.5V @ 15A, Inductor DCR Sensing, 89.4% Efficiency
DC1516A-A Evaluation Board DC1516A-A Evaluation Board - Top View DC1516A-A Evaluation Board - Bottom View DC1516A-A - Schematic
DC1516A-B
LTC3833EFE Demo Board | VIN = 4.5V to 24V, VOUT1 = 1.5V @ 15A, RSENSE
DC1516A-A - Schematic
DC1516A-B
LTC3833EFE Demo Board | VIN = 4.5V to 24V, VOUT1 = 1.5V @ 15A, RSENSE
DC1516A-A - Schematic

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