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Analog Devices Inc. LT3763HFE#PBF
- Part No.:
- LT3763HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3763HFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,290
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Product details
Overview
LT3763HFE#PBF from Analog Devices is a 60V, synchronous step-down LED driver controller with average current mode control, supporting up to 20A output current, ±6% current regulation accuracy, 6V–60V input range, and 0V–55V output voltage range-designed for high-power architectural and automotive LED lighting systems.
For engineers reviewing the LT3763HFE#PBF datasheet, LT3763HFE#PBF pinout, LT3763HFE#PBF application, or LT3763HFE#PBF equivalent, key selection criteria include thermal grade (–40°C to 150°C), 28-lead TSSOP package with exposed pad, dual analog current control (CTRL1/CTRL2), integrated input/output current monitoring, and PWM dimming capability with dedicated PWM_OUT driver.
Technical Context
The LT3763HFE#PBF implements fixed-frequency average current mode control with independent voltage regulation loop, enabling simultaneous current-source and voltage-regulated operation. It features three analog control inputs-CTRL1, CTRL2, and FBIN-with priority-based current setting (lowest voltage dominates) and clamped 0–1.5V input range mapping to 0–51mV sense voltage.
It integrates dual current sensing paths: SENSE+/SENSE– for output current regulation and IVINP/IVINN for input current limiting and monitoring, each with 50mV full-scale threshold and buffered outputs (ISMON/IVINMON) scaling at 20× sense differential. The device supports frequency programming (200kHz–1MHz) via RT resistor or external SYNC clock, and includes thermal shutdown at 165°C with –5°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 60V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Output Current Accuracy | ±6% - ensures consistent LED brightness across temperature and line/load variations. |
| Voltage Regulation Accuracy | ±1.5% - maintains stable output voltage during overvoltage protection or mixed current/voltage regulation modes. |
| Operating Junction Temp | –40°C to 150°C - H-grade qualification enables use in under-hood automotive and high-ambient industrial environments. |
| Switching Frequency Range | 200kHz to 1MHz - adjustable via RT pin or external SYNC signal for EMI optimization and inductor size trade-offs. |
| Shutdown Current | <2µA - minimizes standby power loss in always-on lighting or solar-charging applications. |
| Current Sense Threshold | 51mV typical (SENSE+–SENSE–) - sets 20A output with 2.5mΩ sense resistor, balancing accuracy and power loss. |
Pinout & Package
LT3763HFE#PBF is housed in a thermally enhanced 28-lead plastic TSSOP (FE package) with exposed pad (Pin 29), requiring soldering to PCB ground plane for thermal and electrical integrity. θJA = 30°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BG (1) | Low-side gate driver output | Drives external NMOS with 2.2Ω pull-up / 1Ω pull-down; must not be externally forced. |
| INTVCC (2) | Internal 5V regulator output | Supplies BOOST capacitor charging and internal circuitry; requires ≥22µF bypass to GND. |
| VIN (3) | Main input supply | Accepts 6–60V; requires local ≥4.7µF low-ESR ceramic bypass near exposed pad. |
| EN/UVLO (4) | Enable & undervoltage lockout | Turns on at 4.0V (typ), off at 1.52V (typ); 185mV hysteresis; <2µA shutdown current. |
| VREF (5) | 2.0V buffered reference | Stable 2V source for CTRL1/CTRL2 dividers; capable of 0.5mA drive; bypass with ≥1µF. |
| IVINN (6), IVINP (7) | Inverting/non-inverting inputs of input current sense amp | Monitor input current via external sense resistor; full-scale 50mV corresponds to 20A with 2.5mΩ. |
| IVINMON (8) | Buffered input current monitor output | Scales (VIVINP–VIVINN) ×20; 0–1V output for 0–50mV differential; ≤1nF capacitive load. |
| FAULT (9) | Open/short/C/10 fault indicator | Open-drain output pulled low for FB <0.25V (short), >1.16V + C/10 (open), or VSENSE+–VSENSE– <5mV. |
| FBIN (10) | Peak power tracking input | Enables input-voltage-based current regulation (e.g., solar MPPT); tie to VREF if unused. |
| FB (11) | Voltage feedback input | Regulates output voltage to 1.206V; triggers OVP shutdown at 1.515V. |
| GND (12,23,28,29) | Ground return | Multiple GND pins plus exposed pad (Pin 29) - all must connect to low-impedance PCB ground plane. |
| CTRL2 (13) | Thermal derating control input | Analog input (0–1.5V) to reduce regulated current under thermal stress; overrides CTRL1 when lower. |
| CTRL1 (14) | Primary current set input | Analog input (0–1.5V) setting output current; maps linearly to 0–51mV sense voltage. |
| SS (15) | Soft-start control | 11µA charging current; overrides CTRL1/CTRL2 during startup until voltage exceeds both. |
| SENSE– (16), SENSE+ (17) | Non-inverting/inverting inputs of output current sense amp | Differential pair measuring external sense resistor; full-scale 51mV (typ) for 20A with 2.5mΩ. |
| VC (18) | Current loop compensation node | Connect RC network (e.g., 47.5kΩ + 4.7nF) for stability of average current mode control. |
| ISMON (19) | Buffered output current monitor | Scales (VSENSE+–VSENSE–) ×20; 0–1V output for 0–50mV differential; ≤1nF capacitive load. |
| RT (20) | Frequency programming input | Resistor to GND sets fSW = 200kHz–1MHz; 55µA current-limited; do not leave floating. |
| SYNC (21) | External clock synchronization | Accepts external clock; internal oscillator must run ≥20% slower than SYNC frequency. |
| PWM (22) | PWM dimming enable input | High (>2.175V) enables switching; low (<1.5V) disables all switching and pulls PWM_OUT low. |
| PWM_OUT (24) | Dedicated PWM dimming driver | Push-pull output (2.2Ω pull-up / 0.9Ω pull-down) for external FET dimming; no external bias required. |
| TG (25) | High-side gate driver output | Drives external NMOS with 2.2Ω pull-up / 1.3Ω pull-down; referenced to SW node. |
| SW (26) | Switch node | Connects external high-side and low-side FETs and inductor; critical for layout and EMI control. |
| BOOST (27) | Floating gate drive supply | 5V regulated supply for TG driver; requires Schottky diode from INTVCC to BOOST and 200nF capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Triple analog current control (CTRL1/CTRL2/FBIN) | Enables coordinated thermal derating, dimming, and input-voltage tracking without external logic. |
| Integrated input & output current monitors (IVINMON/ISMON) | Provides real-time 0–1V analog outputs proportional to input/output currents-eliminates need for separate amplifiers. |
| Programmable switching frequency (200kHz–1MHz) | Allows optimization of efficiency, size, and EMI across diverse LED loads and mechanical constraints. |
| Dedicated PWM_OUT driver with 0.9Ω pull-down | Directly drives external MOSFET for true PWM dimming with minimal external components and fast edge control. |
| Comprehensive fault protection | Detects open LED (C/10), short LED (FB <0.25V), overvoltage (FB >1.515V), and thermal shutdown (165°C) with latched or auto-retry behavior. |
Applications
| High-Power Architectural Lighting | Automotive Exterior Lighting |
|---|---|
Use Scenario: Multi-string LED arrays in commercial building facades requiring precise current matching and thermal management across long cable runs. IC Role / Device Role / Timing Role: Primary current-regulated step-down controller managing up to 20A per channel with independent thermal derating via CTRL2. Use Value: ±6% current accuracy ensures uniform luminance; 150°C junction rating supports enclosed fixture designs without forced air cooling. | Use Scenario: Adaptive front-lighting systems (AFS) and dynamic turn signals in vehicles operating from 9–16V battery with load dump transients. IC Role / Device Role / Timing Role: High-reliability LED driver with 60V input tolerance, input current limiting, and robust FAULT reporting for ASIL-B–compatible diagnostics. Use Value: Input current monitoring enables real-time power budgeting; EN/UVLO hysteresis prevents flicker during cold-cranking. |
| Solar-Powered LED Strobes | Industrial Laser Diode Drivers |
Use Scenario: Marine or aviation strobe lights powered by solar-charged SLA batteries with variable input voltage (12–36V). IC Role / Device Role / Timing Role: Peak power tracker using FBIN pin to maximize LED output as solar panel voltage varies, while maintaining constant current regulation. Use Value: FBIN-based input-voltage tracking increases usable light output by up to 30% compared to fixed-current operation under partial shading. | Use Scenario: Precision laser diode biasing in fiber-optic test equipment requiring low-noise, tightly regulated current with fast transient response. IC Role / Device Role / Timing Role: Low-noise current source with 51mV sense threshold and average current mode control minimizing ripple-induced optical noise. Use Value: 200kHz–1MHz programmable frequency allows EMI filtering above sensitive measurement bands; ISMON provides closed-loop current verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | Fixed 500kHz frequency; no FBIN pin; lower max input (40V); same 28-lead TSSOP package. | Lacks peak power tracking and 60V input capability; suitable only for lower-voltage, fixed-frequency designs. | Select LTC3783EFE#PBF only if 40V max input suffices and FBIN functionality is unnecessary. |
| LT3756EMSE#PBF | Higher 100V input rating; boost/buck-boost topology; no integrated input current monitor; 16-lead MSOP package. | Supports wider VIN but lacks dual current monitoring and thermal derating control (CTRL2); different pinout and layout. | Choose LT3756EMSE#PBF for >60V input or non-buck topologies, accepting trade-offs in monitoring and thermal control. |
Compared with LTC3783EFE#PBF and LT3756EMSE#PBF, the LT3763HFE#PBF uniquely combines 60V input, 20A current capability, integrated input/output current monitoring, FBIN-based MPPT, and H-grade thermal rating-making it the only option for high-power, thermally constrained, solar-aware LED systems requiring full diagnostic visibility.
Availability
LT3763HFE#PBF is available at Aetrix Electronics and suitable for high-power architectural lighting, automotive exterior lighting, and solar-powered strobe applications requiring stable component supply, extended temperature operation, and long-term production continuity.
Supply support for LT3763HFE#PBF 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, power management, and industrial systems.
The LT3763 product line delivers high-current, thermally robust LED driver controllers optimized for demanding lighting applications where accuracy, reliability, and system-level diagnostics are critical-including automotive, aerospace, and renewable energy systems.
FAQ
What is the maximum output current supported by the LT3763HFE#PBF?
The LT3763HFE#PBF supports up to 20A output current when used with a 2.5mΩ sense resistor and proper thermal management. Its ±6% current regulation accuracy holds across the full –40°C to 150°C junction temperature range, and the H-grade rating ensures reliable operation at elevated ambient temperatures where other variants would derate or shut down.
How does the LT3763HFE#PBF implement thermal derating?
The LT3763HFE#PBF implements thermal derating via the CTRL2 pin: applying an analog voltage (0–1.5V) to CTRL2 reduces the regulated output current proportionally, overriding CTRL1 when lower. This enables active thermal management without external microcontrollers. Additionally, the device includes autonomous thermal shutdown at 165°C with –5°C hysteresis, forcing reset and SS pin low until temperature recovers.
Can the LT3763HFE#PBF be synchronized to an external clock?
Yes, the LT3763HFE#PBF supports external clock synchronization via the SYNC pin. When enabled, the internal oscillator must be programmed via the RT resistor to run at least 20% slower than the external SYNC frequency. The SYNC pin has precise 1.5V falling-edge and 2.175V rising-edge thresholds, ensuring jitter-free locking across temperature and supply variations.
What protection features are integrated into the LT3763HFE#PBF?
The LT3763HFE#PBF integrates comprehensive protection including overvoltage protection (OVP) triggered at FB = 1.515V, open-LED detection (FB >1.16V + C/10 current), short-LED detection (FB <0.25V), cycle-by-cycle overcurrent limiting (85mV sense threshold), input undervoltage lockout (UVLO) with programmable hysteresis, and thermal shutdown at 165°C. All fault conditions assert the open-drain FAULT pin.
Does the LT3763HFE#PBF support PWM dimming, and how is it implemented?
Yes, the LT3763HFE#PBF supports true PWM dimming via two complementary methods: (1) direct PWM input on the PWM pin, which halts all switching when low, and (2) a dedicated push-pull PWM_OUT driver (2.2Ω pull-up / 0.9Ω pull-down) that can directly drive an external MOSFET for high-frequency, low-jitter dimming. Both methods support up to 3000:1 dimming ratio as specified in the LT3763HFE#PBF datasheet.
LT3763HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 60V
- Voltage - Output:
- 55V
- Current - Output / Channel:
- -
- Frequency:
- 200kHz ~ 1MHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3763HFE#PBF FAQ
1.How can I place an order for LT3763HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3763HFE#PBF 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 LT3763HFE#PBF reliable?
The price and inventory of LT3763HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3763HFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3763HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3763HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3763HFE#PBF?
LT3763HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3763HFE#PBF 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 LT3763HFE#PBF?
For technical support, including LT3763HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3763HFE#PBF requirements.
6.How does Aetrix verify that LT3763HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3763HFE#PBF 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 LT3763HFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3763HFE#PBF?
All LT3763HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3763HFE#PBF, 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 LT3763HFE#PBF part is unused and in its original packaging.
Return procedure for LT3763HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3763HFE#PBF Tags
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