My Inquiry
My Account
Analog Devices Inc. DC2345A
- Part No.:
- DC2345A
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Driver Evaluation Boards
- Package:
- Datasheet:
-
DC2345A.pdf
- Description:
- EVAL BOARD FOR LT8391
- Quantity:
- Payment:
- Shipping:
Inventory:3,031
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DC2345A from Analog Devices is a synchronous 4-switch buck-boost LED controller IC that regulates constant LED current across input voltages (4V–60V) both above and below output voltage (0V–60V), using proprietary peak-buck/peak-boost current mode control. It delivers ±3% LED current accuracy, supports 150kHz–650kHz adjustable switching frequency with spread spectrum EMI reduction, and integrates bootstrap diodes and high-side PMOS PWM switch driver - deployed in automotive headlamps and industrial high-power LED lighting.
For engineers reviewing the DC2345A datasheet, DC2345A pinout, DC2345A application, or DC2345A equivalent, key selection considerations include VIN/VOUT crossover operation, 2000:1 external PWM dimming ratio, AEC-Q100 qualification (J-grade), fault reporting via open/short LED detection, and compatibility with 28-lead TSSOP or QFN packages featuring exposed thermal pad.
Technical Context
The DC2345A implements a single-inductor, four-MOSFET architecture with seamless region transitions (buck → buck-boost → boost) governed by precise VIN/VOUT ratios (e.g., buck-boost to boost at VIN/VOUT = 0.75). Its dual current-sense path-LSP/LSN for inductor current and ISP/ISN for LED current-enables independent regulation and fault detection.
Control logic includes two analog dimming inputs (CTRL1/CTRL2) enabling 20:1 analog dimming with ±3% accuracy at 100mV full scale, plus internal/external PWM dimming with programmable frequency (RP pin) and synchronized/SS operation (SYNC/SPRD pin). Fault handling supports retry, latch-off, or continuous operation modes via SS pin resistor configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports wide-input automotive battery (cold-crank to load-dump) and industrial DC bus systems without pre-regulation. |
| VOUT Range | 0V to 60V - enables direct drive of multi-string LED arrays up to 51V forward voltage without external boost stages. |
| LED Current Accuracy | ±3% at 100mV full scale - ensures consistent luminance across temperature and unit-to-unit variation in lighting modules. |
| Switching Frequency | 150kHz to 650kHz (adjustable via RT) - allows optimization of magnetics size vs. EMI performance; ±15% triangle spread spectrum reduces peak radiated emissions. |
| PWM Dimming Ratio | 2000:1 external, 128:1 internal - enables flicker-free dimming down to 0.05% duty cycle for precision lighting control in adaptive driving beams. |
| Fault Protection | Open LED (VFB > 0.95V & V(ISP−ISN) < 10mV), short LED (VFB < 0.25V) - provides real-time LED string integrity monitoring with FAULT pin assertion and configurable response. |
| Package Options | 28-lead TSSOP (FE) and 28-lead 4mm × 5mm QFN (UFD), both with exposed GND pad - ensures thermal reliability in high-power LED driver PCB layouts. |
Pinout & Package
DC2345A is available in two thermally enhanced packages: 28-lead plastic TSSOP (FE) and 28-lead 4mm × 5mm plastic QFN (UFD), both featuring an exposed GND pad (Pin 29) requiring soldering to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail connection | Determines operating region (buck/buck-boost/boost); requires ≥1µF local ceramic bypass to GND. |
| VOUT | Output supply rail connection | Serves as power output reference and positive rail for PWMTG driver; requires ≥1µF local ceramic bypass. |
| ISP / ISN | High-side LED current sense differential inputs | Kelvin-connected across RLED to enable ±3% accurate current regulation and open/short LED fault detection. |
| LSP / LSN | Inductor current sense differential inputs | Kelvin-connected across RSENSE to support peak-buck/peak-boost control and reverse-current detection. |
| TG1 / BG1 / BST1 / SW1 | Buck-side MOSFET gate drivers and switch node | Drive external N-channel buck-side FETs; BST1 integrates Schottky diode and requires external bootstrap capacitor to SW1. |
| TG2 / BG2 / BST2 / SW2 | Boost-side MOSFET gate drivers and switch node | Drive external N-channel boost-side FETs; BST2 integrates Schottky diode and requires external bootstrap capacitor to SW2. |
| PWMTG | High-side PMOS PWM switch driver | Inverted buffered PWM output swinging from (VOUT – 5V) to VOUT - directly drives external high-side PMOS for LED string modulation. |
| CTRL1 / CTRL2 | Analog dimming and thermal derating inputs | Set LED current threshold (0–100mV) linearly; CTRL2 enables temperature-dependent current roll-off for thermal management. |
| FAULT | Open-drain fault status output | Pulled low during open/short LED faults; updated only during PWM high state and latched during low state. |
| SS | Soft-start and fault-mode configuration | Capacitor sets soft-start time; resistor to VREF selects hiccup (no resistor), latch-off (499kΩ), or keep-running (100kΩ) fault response. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch single-inductor topology | Eliminates need for separate buck + boost converters - reduces BOM count, board area, and design complexity in VIN/VOUT crossover applications. |
| Integrated bootstrap Schottky diodes | Removes two external diodes per side - simplifies layout, improves reliability, and reduces component cost in high-volume LED driver designs. |
| Proprietary peak-buck/peak-boost control | Ensures smooth, low-noise transitions between operating regions (e.g., buck-boost to boost at VIN/VOUT = 0.75) without output glitches or current discontinuity. |
| AEC-Q100 qualified (J-grade) | Validated for automotive underhood environments (–40°C to +150°C junction), including HTOL, TC, and ESD testing - suitable for ASIL-B relevant subsystems. |
| No top-MOSFET refresh noise | Eliminates audible switching artifacts in buck or boost modes - critical for premium automotive lighting where acoustic noise is strictly controlled. |
Applications
| Automotive Adaptive Headlamps | Industrial High-Bay LED Fixtures |
|---|---|
Use Scenario: Dynamic beam shaping in ADAS-enabled vehicles using segmented LED arrays with individual zone dimming. IC Role / Device Role / Timing Role: Primary LED current controller managing up to 50W per channel with 2000:1 PWM dimming and real-time open-circuit fault detection. Use Value: Enables pixel-level illumination control while maintaining ±3% current accuracy across temperature and input voltage transients (e.g., 6V–16V battery range). | Use Scenario: Multi-string 100W+ LED lighting in warehouses and factories with 0–10V or DALI dimming interfaces. IC Role / Device Role / Timing Role: Constant-current buck-boost LED driver supporting 24V–48V DC distribution buses and 36–51V LED strings. Use Value: Delivers 98% peak efficiency across wide VIN/VOUT ranges, reducing thermal load and enabling fanless fixture designs. |
| Off-Road Vehicle Lighting | UV-C Disinfection Systems |
Use Scenario: Ruggedized LED work lights on construction and agricultural equipment subjected to vibration, wide temperature swings, and load-dump events. IC Role / Device Role / Timing Role: Robust LED controller with 60V absolute max ratings, integrated UVLO hysteresis, and latch-off fault protection. Use Value: Survives 80V load-dump pulses and operates reliably from –40°C to +150°C junction, eliminating field failures in harsh environments. | Use Scenario: Pulsed UV-C LED arrays for surface disinfection requiring precise current control and thermal derating to maintain LED lifetime. IC Role / Device Role / Timing Role: High-accuracy current regulator with CTRL2-based thermal foldback and flicker-free spread-spectrum operation. Use Value: Prevents UV-C LED overheating via programmable current roll-off while minimizing EMI interference with sensitive sensor electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3965 | 4-switch buck-boost LED controller with I²C interface, 12-bit DAC dimming, and built-in fault diagnostics; lower max VIN (55V) and no spread spectrum. | Targeted at digitally managed lighting systems requiring host microcontroller coordination and telemetry. | Choose LT3965 when digital control, diagnostics logging, or multi-channel synchronization via I²C is required - not for standalone analog-dimming designs. |
| TPS92692 | High-side current-sense buck-boost LED controller with integrated gate drivers; narrower VIN range (4.5V–65V), no spread spectrum, and lower PWM dimming ratio (1000:1). | Optimized for cost-sensitive automotive tail-light and DRL applications with simpler thermal requirements. | Choose TPS92692 for non-AEC-Q100 industrial lighting or where integrated high-side sensing eliminates Kelvin routing complexity. |
Compared with LT3965 and TPS92692, DC2345A uniquely combines AEC-Q100 J-grade qualification, ±15% spread spectrum EMI reduction, and 2000:1 external PWM dimming - making it optimal for high-reliability, low-EMI automotive headlamp and industrial UV-C systems demanding analog simplicity and robustness.
Availability
DC2345A is available at Aetrix Electronics and suitable for automotive headlamps, industrial high-bay LED fixtures, off-road vehicle lighting, and UV-C disinfection systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for DC2345A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
DC2345A belongs to the LT8391 family of synchronous 4-switch buck-boost LED controllers, designed specifically for high-efficiency, wide-input-output-ratio LED lighting in thermally constrained and EMI-sensitive environments.
FAQ
What is the maximum input voltage rating for DC2345A?
The DC2345A has an absolute maximum input voltage rating of 60V on the VIN pin, with guaranteed operation from 4V to 60V across its full temperature range. This enables direct connection to 48V industrial buses and automotive 12V/24V systems including load-dump transients up to 60V, provided external clamping or filtering is applied per system-level requirements.
Does DC2345A support spread spectrum frequency modulation?
Yes, DC2345A supports flicker-free triangle spread spectrum operation with ±15% deviation around the programmed switching frequency when the SYNC/SPRD pin is tied to INTVCC. This feature significantly reduces peak EMI emissions without compromising LED current regulation accuracy or introducing audible noise - validated in CISPR-25 Class 5 automotive EMC testing.
How does DC2345A handle LED open-circuit faults?
DC2345A detects open LED conditions when FB voltage exceeds 0.95V *and* ISP–ISN voltage falls below 10mV. Upon detection, the FAULT pin is pulled low, and behavior depends on SS pin configuration: open circuit triggers hiccup mode (default), 499kΩ to VREF enables latch-off, and 100kΩ to VREF maintains continuous operation - all without external microcontroller intervention.
Can DC2345A drive both buck and boost MOSFETs simultaneously?
No - DC2345A uses time-multiplexed 4-switch operation: in buck mode only TG1/BG1 are active; in boost mode only TG2/BG2 are active; in buck-boost mode all four switches operate in coordinated phase. The proprietary peak-buck/peak-boost control ensures zero-voltage or zero-current transitions at region boundaries to minimize switching loss and EMI.
What package variants are offered for DC2345A?
DC2345A is offered in two RoHS-compliant, lead-free packages: 28-lead plastic TSSOP (FE) with θJA = 30°C/W and 28-lead 4mm × 5mm plastic QFN (UFD) with θJA = 43°C/W. Both include an exposed GND pad (Pin 29) that must be soldered to the PCB ground plane to meet thermal and electrical specifications per datasheet layout guidelines.
DC2345A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Current - Output / Channel:
- 2A
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- 25V
- Features:
- -
- Voltage - Input:
- 4V ~ 60V
- Contents:
- Board(s)
- Utilized IC / Part:
- LT8391
DC2345A FAQ
1.How can I place an order for DC2345A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC2345A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DC2345A reliable?
The price and inventory of DC2345A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC2345A is usually 5 days.
3.What payment methods are accepted for DC2345A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC2345A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC2345A?
DC2345A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC2345A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DC2345A?
For technical support, including DC2345A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC2345A requirements.
6.How does Aetrix verify that DC2345A is sourced from the original manufacturer or authorized distributors?
All DC2345A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DC2345A meets industry standards.
7.What is the process for return or replacement of DC2345A?
All DC2345A units undergo pre-shipment inspection (PSI). If there is an issue with DC2345A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DC2345A part is unused and in its original packaging.
Return procedure for DC2345A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DC2345A Tags
-
COM-13716
SparkFun Electronics
-
B-G474E-DPOW1
STMicroelectronics
-
EVB81116-A2
Melexis Technologies NV
-
EVB81116-A3
Melexis Technologies NV
-
LP5036EVM
Texas Instruments
-
LP5813-12WCSPEVM
Texas Instruments
-
LP8863EVM
Texas Instruments
-
1455
Adafruit Industries LLC
-
1427
Adafruit Industries LLC
-
WIG-13279
SparkFun Electronics
-
5650
Adafruit Industries LLC
-
1429
Adafruit Industries LLC
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
