LT8391A Series
60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum
Manufacturer: Analog Devices
Catalog
60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum
| Part | Operating Temperature [Min] | Operating Temperature [Max] | Voltage - Supply (Min) [Min] | Voltage - Output | Internal Switch(s) | Applications | Frequency [Min] | Frequency [Max] | Type | Package / Case | Package / Case [custom] | Package / Case [x] | Mounting Type | Number of Outputs | Supplier Device Package | Topology | Grade | Dimming | Qualification | Voltage - Output [Max] | Voltage - Output [Min] |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Analog Devices | -40 °C | 125 ¯C | 4 V | 60 V | Lighting | 600 kHz | 2 MHz | DC DC Controller | 28-TSSOP Exposed Pad | 4.4 mm | 0.173 in | Surface Mount | 1 | 28-TSSOP-EP | Step-Down (Buck) Step-Up (Boost) | Automotive | Analog PWM | ||||
Analog Devices | -40 °C | 150 °C | 4 V | Lighting | 150 kHz | 650 kHz | DC DC Controller | 28-WFQFN Exposed Pad | Surface Mount Wettable Flank | 1 | 28-QFN (4x5) | Step-Down (Buck) Step-Up (Boost) | Automotive | Analog PWM | AEC-Q100 | 60 VDC | 0 VDC | ||||
 Analog Devices | -40 °C | 150 °C | 4 V | 60 V | Lighting | 150 kHz | 650 kHz | DC DC Controller | 28-WFQFN Exposed Pad | Surface Mount | 1 | 28-QFN (4x5) | Step-Down (Buck) Step-Up (Boost) | Automotive | Analog PWM | ||||||
Analog Devices | -40 °C | 125 ¯C | 4 V | 60 V | Lighting | 150 kHz | 650 kHz | DC DC Controller | 28-WFQFN Exposed Pad | Surface Mount | 1 | 28-QFN (4x5) | Step-Down (Buck) Step-Up (Boost) | Automotive | Analog PWM | ||||||
 Analog Devices | -40 °C | 125 ¯C | 4 V | 60 V | Lighting | 150 kHz | 650 kHz | DC DC Controller | 28-TSSOP Exposed Pad | 4.4 mm | 0.173 in | Surface Mount | 1 | 28-TSSOP-EP | Step-Down (Buck) Step-Up (Boost) | Automotive | Analog PWM | ||||
Analog Devices | -40 °C | 125 ¯C | 4 V | 60 V | Lighting | 600 kHz | 2 MHz | DC DC Controller | 28-TSSOP Exposed Pad | 4.4 mm | 0.173 in | Surface Mount | 1 | 28-TSSOP-EP | Step-Down (Buck) Step-Up (Boost) | Automotive | Analog PWM | ||||
 Analog Devices | -40 °C | 150 °C | 4 V | 60 V | Lighting | 600 kHz | 2 MHz | DC DC Controller | 28-TSSOP Exposed Pad | 4.4 mm | 0.173 in | Surface Mount | 1 | 28-TSSOP-EP | Step-Down (Buck) Step-Up (Boost) | Automotive | Analog PWM | ||||
Analog Devices | -40 °C | 125 ¯C | 4 V | 60 V | Lighting | 600 kHz | 2 MHz | DC DC Controller | 28-TSSOP Exposed Pad | 4.4 mm | 0.173 in | Surface Mount | 1 | 28-TSSOP-EP | Step-Down (Buck) Step-Up (Boost) | Automotive | Analog PWM | ||||
Analog Devices | -40 °C | 125 ¯C | 4 V | 60 V | Lighting | 150 kHz | 650 kHz | DC DC Controller | 28-TSSOP Exposed Pad | 4.4 mm | 0.173 in | Surface Mount | 1 | 28-TSSOP-EP | Step-Down (Buck) Step-Up (Boost) | Automotive | Analog PWM | ||||
Analog Devices | -40 °C | 150 °C | 4 V | 60 V | Lighting | 150 kHz | 650 kHz | DC DC Controller | 28-WFQFN Exposed Pad | Surface Mount | 1 | 28-QFN (4x5) | Step-Down (Buck) Step-Up (Boost) | Automotive | Analog PWM |
Key Features
• 4-Switch Single Inductor Architecture Allows VINAbove, Below or Equal to VOUT
• Synchronous Switching: Up to 98% Efficiency
• Proprietary Peak-Buck Peak-Boost Current Mode
• Wide VINRange: 4V to 60V
• Wide VOUTRange: 0V to 60V (51V LED)
• ±3% LED Current Accuracy
• 2000:1 External and 128:1 Internal PWM Dimming
• High Side PMOS PWM Switch Driver
• Integrated Bootstrap Diodes
• No Top MOSFET Refresh Noise in Buck or Boost
• Adjustable and Synchronizable: 150kHz to 650kHz
• Flicker-Free Spread Spectrum for Low EMI
• Open and Short LED Protection with Fault Reporting
• Available in 28-Lead TSSOP with Exposed Pad and 28-Lead QFN (4mm × 5mm)
• AEC-Q100 Qualified for Automotive Applications
Description
AI
The LT8391A is a synchronous 4-switch buck-boost LED controller that regulates LED current from input voltage above, below, or equal to the output voltage. The proprietary peak-buck peak-boost current mode control scheme allows adjustable and synchronizable 600kHz to 2MHz fixed frequency operation, or internal 25% triangle spread spectrum operation for low EMI. With 4V to 60V input, 0V to 60V output, and seamless low noise transitions between operation regions, the LT8391A is ideal for LED driver and battery charger applications in automotive, industrial, and battery-powered systems.The LT8391A provides both internal (up to 128:1) and external (up to 2000:1) LED current PWM dimming with a high-side PMOS switch. Two CTRL pins provide flexible 20:1 analog dimming with ±3% LED current accuracy at 100mV full scale. Fault protection is provided to detect an open or short LED condition, during which the LT8391A retries, latches off, or keeps running.Switching FrequencyMax Output PowerLT8391Adjustable 150kHz - 650kHz450W+LT8391A2MHz50W+APPLICATIONSAutomotive Head Lamps/Running LampsHigh Frequency LED Lighting