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

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.

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
Typical Application
LT3796 Typical Application
LT3796 Typical Application
Applications
  • High Power LED, High Voltage LED, Dual String
  • Battery and SuperCap Chargers
  • Accurate Current Limited Voltage Regulators
Packaging
LT3796 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT3796EFE-1#PBFTSSOP-28E$4.93$3.45
LT3796EFE-1#TRPBFTSSOP-28E$3.51
LT3796EFE#PBFTSSOP-28E$4.93$3.45
LT3796EFE#TRPBFTSSOP-28E$3.51
LT3796HFE-1#PBFTSSOP-28H$5.87$4.11
LT3796HFE-1#TRPBFTSSOP-28H$4.17
LT3796HFE#PBFTSSOP-28H$5.87$4.11
LT3796HFE#TRPBFTSSOP-28H$4.17
LT3796IFE-1#PBFTSSOP-28I$5.51$3.86
LT3796IFE-1#TRPBFTSSOP-28I$3.92
LT3796IFE#PBFTSSOP-28I$5.51$3.86
LT3796IFE#TRPBFTSSOP-28I$3.92
Demo Boards
Part NumberDescriptionPrice
DC1706ALT3796EFE Demo Board I 100V LED Controller with Current Monitor; 8V to 85VIN, up to 85VOUT@0.4A$200.00
Datasheet
Reliability Data
LT Journal
Press Release
CAD Symbol
LTspice
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