LT3796/LT3796-1 - 100V Constant-Current and Constant-Voltage Controller with Dual Current Sense

Features

  • 3000:1 True Color PWM™ Dimming
  • Wide Input Voltage Range: 6V to 100V
  • Current Monitoring Up to 100V
  • High Side PMOS Disconnect and PWM Switch Driver
  • Constant-Current and Constant-Voltage Regulation
  • Dual Current Sense Amplifiers with Reporting
  • C/10 Detection for Battery and SuperCap Charging
  • Linear Current Sense Threshold Programming
  • Short-Circuit Protection
  • Adjustable Frequency: 100kHz to 1MHz
  • Frequency Synchronization (LT3796)
  • Independent Top Gate Enable Pin (LT3796-1)
  • Programmable Open LED Protection with VMODE Flag
  • Programmable Undervoltage Lockout with Hysteresis
  • Soft-Start with Programmable Fault Restart Timer
  • Available in 28-Lead TSSOP Package
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT3796 Typical Application
LT3796 Typical Application

Description

The LT®3796/LT3796-1 are DC/DC controllers designed to regulate a constant-current or constant-voltage and are ideal for driving LEDs. The fixed frequency and current mode architecture result in stable operation over a wide range of supply and output voltages. Two ground referred voltage FB pins serve as the input for several LED protection features, and also allow the converter to operate as a constant-voltage source. The LT3796/LT3796-1 feature a programmable threshold output current sense amplifier with rail-to-rail common mode range. A separate high side amplifier is gain configurable with two resistors and can be used to regulate a second current or a voltage in combination with one of the FB pins. The PWM input provides LED dimming ratios of up to 3000:1.

The LT3796-1 is optimized for a second output current regulation loop that can be enabled/disabled with a PMOS switch, either to drive a second LED string or to extend analog dimming range.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT3796EFE-1#PBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT3796EFE-1#TRPBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT3796EFE#PBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT3796EFE#TRPBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT3796HFE-1#PBF TSSOP-28 FE H 05-08-1663 (EB) Yes
LT3796HFE-1#TRPBF TSSOP-28 FE H 05-08-1663 (EB) Yes
LT3796HFE#PBF TSSOP-28 FE H 05-08-1663 (EB) Yes
LT3796HFE#TRPBF TSSOP-28 FE H 05-08-1663 (EB) Yes
LT3796IFE-1#PBF TSSOP-28 FE I 05-08-1663 (EB) Yes
LT3796IFE-1#TRPBF TSSOP-28 FE I 05-08-1663 (EB) Yes
LT3796IFE#PBF TSSOP-28 FE I 05-08-1663 (EB) Yes
LT3796IFE#TRPBF TSSOP-28 FE I 05-08-1663 (EB) Yes


LT3796 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3796EFE-1#PBF TSSOP-28 E $4.93 $3.45 Yes
LT3796EFE-1#TRPBF TSSOP-28 E $3.51 Yes
LT3796EFE#PBF TSSOP-28 E $4.93 $3.45 Yes
LT3796EFE#TRPBF TSSOP-28 E $3.51 Yes
LT3796HFE-1#PBF TSSOP-28 H $5.87 $4.11 Yes
LT3796HFE-1#TRPBF TSSOP-28 H $4.17 Yes
LT3796HFE#PBF TSSOP-28 H $5.87 $4.11 Yes
LT3796HFE#TRPBF TSSOP-28 H $4.17 Yes
LT3796IFE-1#PBF TSSOP-28 I $5.51 $3.86 Yes
LT3796IFE-1#TRPBF TSSOP-28 I $3.92 Yes
LT3796IFE#PBF TSSOP-28 I $5.51 $3.86 Yes
LT3796IFE#TRPBF TSSOP-28 I $3.92 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1706A LT3796EFE Demo Board I 100V LED Controller with Current Monitor; 8V to 85VIN, up to 85VOUT@0.4A $200.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT3796HFE-1#PBF TSSOP-28 H $5.87 $4.11 Yes
LT3796HFE-1#TRPBF TSSOP-28 H $4.17 Yes
LT3796HFE#PBF TSSOP-28 H $5.87 $4.11 Yes
LT3796HFE#TRPBF TSSOP-28 H $4.17 Yes
LT3796IFE-1#PBF TSSOP-28 I $5.51 $3.86 Yes
LT3796IFE-1#TRPBF TSSOP-28 I $3.92 Yes
LT3796IFE#PBF TSSOP-28 I $5.51 $3.86 Yes
LT3796IFE#TRPBF TSSOP-28 I $3.92 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

  • High Power LED, High Voltage LED, Dual String
  • Battery and SuperCap Chargers
  • Accurate Current Limited Voltage Regulators

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Design Tools

LTspice

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Models for the following parts are available in LTspice:
LT3796
LT3796-1

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