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Overview
| Topology | Buck-Boost Converter |
| Input voltage | 5-40 V |
| Switching frequency | 645-2100 kHz |
| Output 1 | 12 V / 1 A |
Description
The LT®8391A is a synchronous 4-switch buck-boostLED controller that regulates LED current from inputvoltage above, below, or equal to the output voltage. Theproprietary peak-buck peak-boost current mode controlscheme allows adjustable and synchronizable 600kHz to2MHz fixed frequency operation, or internal 25% trianglespread spectrum operation for low EMI. With 4V to 60Vinput, 0V to 60V output, and seamless low noise transitionsbetween operation regions, the LT8391A is ideal forLED driver and battery charger applications in automotive,industrial, and battery-powered systems.The LT8391A provides both internal (up to 128:1) andexternal (up to 2000:1) LED current PWM dimming witha high-side PMOS switch. Two CTRL pins provide flexible20:1 analog dimming with ±3% LED current accuracy at100mV full scale. Fault protection is provided to detect anopen or short LED condition, during which the LT8391Aretries, latches off, or keeps running.
Features
nn 4-Switch Single Inductor Architecture Allows VINAbove, Below or Equal to VOUTnn Up to 95% Efficiency at 2MHznn Proprietary Peak-Buck Peak-Boost Current Modenn Wide VIN Range: 4V to 60Vnn Wide VOUT Range: 0V to 60V (51V LED)nn ±3% LED Current Accuracynn 2000:1 External and 128:1 Internal PWM Dimmingnn High Side PMOS PWM Switch Drivernn No Top MOSFET Refresh Noise in Buck or Boostnn Adjustable and Synchronizable: 600kHz to 2MHznn Flicker-Free Spread Spectrum for Low EMInn Open and Short LED Protection with Fault Reportingnn Available in 28-Lead TSSOP with Exposed Pad and28-Lead QFN (4mm × 5mm)
Typical applications
- High Frequency LED Lighting
- Automotive Head Lamps/Running Lamps
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR (mA) | Z @ 1 GHz (Ω) | H (mm) | Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 744311330 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCI SMT Flat Wire High Current Inductor | 3.3 | 8.1 | 4.5 | 11 | 17.2 | 43 | Superflux | – | – | – | – | – | 3.8 | – | ||
 | 74279221281 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-MPSB EMI Multilayer Power Suppression Bead | – | – | – | – | – | – | – | 280 | 288 | 125 MHz | 3500 | 82 | 1.1 | High Current |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 744311330 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | |
| 74279221281 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR (mA) | Z @ 1 GHz (Ω) | H (mm) | Type | Samples |
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