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Overview
| Topology | Buck Converter |
| Input voltage | 4.5-60 V |
| Switching frequency | 100-1000 kHz |
Description
The LT®3761A is a DC/DC controller designed to operate asa constant-current source and constant-voltage regulator.It features a programmable internal PWM dimming signal.The LT3761A is ideally suited for driving high current LEDs,but also has features to make it suitable for charging batteriesand supercapacitors. The fixed frequency, currentmode architecture results in stable operation over a widerange of supply and output voltages. A voltage feedbackpin serves as the input for several LED protection features,and also makes it possible for the converter to operateas a constant-voltage source. A frequency adjust pinallows the user to program the frequency from 100kHzto 1MHz to optimize efficiency, performance or externalcomponent size.
Features
3000:1 True Color PWM™ Dimming for LEDsWide VIN Range: 4.5V to 60VRail-to-Rail Current Sense Range: 0V to 80VProgrammable PWM Dimming Signal GeneratorConstant Current (±3%) and Constant-Voltage(±2%) RegulationAnalog DimmingDrives LEDs in Boost, SEPIC, Inverting, Buck Mode,Buck-Boost Mode, or Flyback ConfigurationOutput Short-Circuit Protected BoostOpen LED Protection and ReportingAdjustable Switching Frequency: 100kHz to 1MHzProgrammable VIN UVLO with HysteresisC/10 Indication for Battery ChargersLow Shutdown Current: <1μAThermally Enhanced 16-Lead MSOP Package
Typical applications
- Accurate Current Limited Voltage Regulators
- Battery and SuperCap Chargers
- Grounded Anode LEDs
- High Voltage LED Strings >100V with Ground Referred Current Sense
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | Material | LR(µH) | L1(µH) | L2(µH) | IR(A) | IR 2(A) | ISAT(A) | RDC1 typ(Ω) | RDC2 typ(Ω) | RDC1 max(Ω) | RDC2 max(Ω) | fres(MHz) | Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCC SMT High Current Cube Inductor, 1 µH, 32.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCC SMT High Current Cube Inductor | Inductance1 µH | Performance Rated Current32.5 A | Saturation Current @ 10%28.5 A | Saturation Current @ 30%55.1 A | DC Resistance2.5 mΩ | MaterialIron Powder | Rated Inductance0.94 µH | – | – | – | – | Saturation Current52 A | – | – | – | – | Self Resonant Frequency100 MHz | – | ||||
 | WE-DD SMT Shielded Coupled Inductor, 4.7 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-DD SMT Shielded Coupled Inductor | Inductance4.7 µH | – | – | – | DC Resistance30 mΩ | – | – | Inductance 14.7 µH | Inductance 24.7 µH | Rated Current3.6 A | Rated Current 23.6 A | Saturation Current10 A | DC Resistance 10.025 Ω | DC Resistance 20.025 Ω | DC Resistance 10.03 Ω | DC Resistance 20.03 Ω | Self Resonant Frequency34 MHz | TypeCrossed |