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Analog Devices Inc. LTC3783IDHD#PBF
- Part No.:
- LTC3783IDHD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3783IDHD#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,157
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Product details
Overview
LTC3783IDHD#PBF from Analog Devices (formerly Linear Technology) is a current-mode PWM LED driver and boost/flyback/SEPIC controller with integrated N-channel MOSFET gate drivers for both power switch (GATE) and load PWM switch (PWMOUT). It delivers true-color PWM dimming up to 3000:1, supports analog dimming via FBP/ILIM, enables No RSENSE operation using MOSFET RDS(ON), and operates from 3V to 36V input with 20kHz–1MHz programmable frequency. It is used in high-brightness LED backlighting for industrial displays requiring stable color fidelity across wide dimming ranges.
For engineers reviewing the LTC3783IDHD#PBF datasheet, LTC3783IDHD#PBF pinout, LTC3783IDHD#PBF application, or LTC3783IDHD#PBF equivalent, key selection considerations include its dual-switch control architecture, 1.23V ±1% reference accuracy, 100mV current-sense threshold tolerance, –40°C to 125°C extended temperature rating, and DFN-16 (5mm × 4mm) thermal-enhanced package with exposed GND pad.
Technical Context
The LTC3783IDHD#PBF implements a constant-frequency, current-mode control architecture with slope compensation, supporting boost, flyback, and SEPIC topologies. Its error amplifier (gm = 1.7–14 mmho, AVOL = 500 V/V) drives the ITH node to modulate peak inductor current, while the patented PWMIN-triggered ITH storage mechanism enables sub-microsecond load reactivation without output voltage transients.
It integrates two independent gate drivers: a 0.5A/1A peak sourcing/sinking GATE driver for the main power MOSFET and a 0.25A/0.5A PWMOUT driver for external load switching. The internal 7V LDO (6.5–7.5V output, 75mA max) powers all drivers and logic, with dedicated 4.7µF low-ESR ceramic bypassing required on INTVCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports wide-input industrial and automotive supply rails without external pre-regulation. |
| Reference Voltage Accuracy | 1.23V ±1% - ensures precise current/voltage regulation setpoints across temperature and line variations. |
| Current Sense Threshold | 125–180mV - defines minimum detectable sense voltage for accurate current limiting and regulation. |
| Operating Frequency Range | 20kHz to 1MHz - adjustable via single RT resistor; enables optimization of efficiency vs. size in magnetics design. |
| Shutdown Quiescent Current | 20µA typical - minimizes system standby power in always-on LED lighting applications. |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive, industrial controls, and telecom power systems. |
| Package Thermal Resistance | θJA = 43°C/W (DFN) - enables higher continuous power dissipation than TSSOP variant in compact layouts. |
Pinout & Package
Package: 16-lead (5mm × 4mm) plastic DFN with exposed thermal pad (Pin 17), rated for –40°C to +125°C operation. Exposed pad must be soldered to PCB ground for electrical integrity and thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (16) | Enable/Shutdown Control Input | 1.248V rising threshold with 100mV hysteresis - provides noise-immune start-up sequencing and low-IQ shutdown (20µA). |
| ITH (15) | Error Amplifier Output / Compensation Node | 0–1.4V control voltage - sets peak current comparator threshold; stores load current state during PWMIN low. |
| OV/FB (14) | Overvoltage Detection / Voltage Feedback Input | 1.32V OV lockout (VREF + 7%) or 1.23V regulation target - protects output stage and enables CV mode. |
| SS (13) | Soft-Start Timing Node | 50µA pull-up current - charges external capacitor to ramp ITH limit, preventing inrush current at startup. |
| SENSE (12) | Main Current Sense Input | Accepts VDS sensing (≤36V) or shunt resistor - enables No RSENSE mode for highest efficiency. |
| VIN (11) | Main Power Supply Input | 3–36V input rail - powers internal bias circuits and supplies charge pump for GATE driver. |
| INTVCC (10) | Internal 7V Regulator Output | 6.5–7.5V, 75mA max - powers gate drivers and logic; requires ≥4.7µF local ceramic bypass. |
| GATE (9) | Main Power MOSFET Driver Output | 0.5A sink / 1A source peak - directly drives N-channel boost switch with fast rise/fall times (15ns/8ns). |
| FBN (1) | Error Amp Inverting Input / Negative Sense | Connects to load return or feedback divider - completes regulation loop for CC/CV modes. |
| FBP (2) | Error Amp Noninverting Input / Positive Sense | 0–1.23V (CV) or 2.5–36V (CC) - selects regulation mode and sets reference point for error amplifier. |
| ILIM (3) | Analog Current Limit Control | 0.1–1.23V input - scales current-sense offset from 10mV to 100mV for 10:1 analog dimming ratio. |
| VREF (4) | Buffered 1.23V Reference Output | 1.23V ±1%, 0.5mA max - provides precision reference for external resistive dividers or FBP connection. |
| FREQ (5) | Oscillator Frequency Programming | 0.615V nominal voltage - sets fOSC via external RT resistor (20kΩ → 300kHz typical). |
| SYNC (6) | External Clock Synchronization Input | 100kΩ internal pull-down - accepts 100–130% fOSC clock for EMI reduction and multi-phase coordination. |
| PWMIN (7) | Digital Dimming Enable Input | 1.6V/0.8V thresholds with hysteresis - triggers instantaneous ITH hold and PWMOUT/GATE disable for true-color PWM dimming. |
| PWMOUT (8) | Load PWM Switch Driver Output | 0.25A sink / 0.5A source - controls external N-channel FET for LED string disconnect or current path gating. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM Dimming | 3000:1 digital dimming ratio with zero color shift - achieved by storing ITH state during PWMIN low, eliminating transient over/undervoltage. |
| No RSENSE Operation | Eliminates external current-sense resistor by using MOSFET RDS(ON) - improves efficiency and reduces BOM cost for VDS ≤ 36V applications. |
| Constant Current / Constant Voltage Regulation | Auto-selects CC or CV mode based on FBP voltage - supports LED current regulation or output voltage clamping in same circuit. |
| Programmable Soft-Start | 50µA SS pin current - enables controlled ITH ramp and inductor current buildup to prevent inrush stress on input capacitors and LEDs. |
| Integrated 7V LDO | 6.5–7.5V output, 75mA capability - powers gate drivers independently of VIN, enabling stable operation down to 3V input. |
| Wide FB Voltage Range | 0V to 1.23V (CV mode) or 2.5V to 36V (CC mode) - accommodates diverse feedback configurations including high-side current sensing. |
Applications
| High-Brightness LED Backlighting | Industrial Display Power Supplies |
|---|---|
Use Scenario: Driving 4–12 series white LEDs (VF ≈ 3.2V each) in medical imaging panels requiring flicker-free, color-stable dimming from 0.03% to 100% brightness. IC Role / Device Role / Timing Role: Primary LED current controller and boost converter regulator; manages GATE switching, PWMOUT load disconnect, and ITH-based current loop stability. Use Value: 3000:1 true-color PWM dimming eliminates chromaticity drift during dimming, critical for diagnostic image fidelity and operator visual comfort. |
Use Scenario: Powering 24V-rated LED arrays in factory HMIs and ruggedized touchscreens operating in ambient temperatures from –40°C to +85°C. IC Role / Device Role / Timing Role: Dual-mode CC/CV controller supporting both constant-current LED drive and regulated 24V auxiliary rail generation. Use Value: Single-chip solution replaces discrete controllers and external references, reducing layout area and improving thermal reliability in sealed enclosures. |
| Telecom DC-DC Converters | Automotive 42V System Power |
Use Scenario: Generating isolated 48V/1A outputs from –48V telecom battery backup systems with strict EMI requirements. IC Role / Device Role / Timing Role: Flyback controller with SYNC input synchronized to system clock - suppresses switching noise in sensitive communication bands. Use Value: External clock synchronization (up to 1.3× fOSC) enables deterministic noise placement and compliance with EN55022 Class B limits. |
Use Scenario: Boosting 12V vehicle battery to 42V for high-power LED headlamps and ADAS sensor illumination in engine compartments. IC Role / Device Role / Timing Role: High-voltage boost controller with 36V SENSE pin rating and –40°C to +125°C qualification - handles cold cranking and thermal soak conditions. Use Value: Extended temperature grade and robust overvoltage protection (1.32V OV threshold) ensure reliable operation during load dump transients and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver and boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#PBF | Same functionality but rated for –40°C to +85°C; TSSOP-16 package with θJA = 38°C/W. | Suitable for commercial-grade LED drivers where extended temperature is not required. | Select when lower thermal resistance is prioritized over footprint size and ambient temperature exceeds 85°C. |
| LTC3783IFE#PBF | Identical electrical specs and temperature range (–40°C to +125°C), but in TSSOP-16 package. | Preferred for legacy PCBs with TSSOP footprints or manual assembly processes. | Choose when board space allows larger TSSOP and thermal management uses heatsinking rather than PCB copper area. |
Compared with LTC3783EFE#PBF and LTC3783IFE#PBF, the LTC3783IDHD#PBF offers superior thermal performance per unit area (43°C/W in 5mm × 4mm DFN) and is optimized for high-density, thermally constrained industrial and automotive LED systems where PCB real estate is limited.
Availability
LTC3783IDHD#PBF is available at Aetrix Electronics and suitable for high-brightness LED backlighting, industrial display power supplies, and automotive 42V system power requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LTC3783IDHD#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 (acquired Linear Technology in 2017) designs high-performance analog, mixed-signal, and power management ICs for precision signal chain and power conversion applications.
The LTC3783 product line delivers integrated PWM LED drivers and multi-topology DC/DC controllers targeting high-efficiency, high-dimming-ratio lighting and industrial power systems where color fidelity, thermal robustness, and design simplicity are critical.
FAQ
What is the maximum input voltage supported by the LTC3783IDHD#PBF?
The LTC3783IDHD#PBF supports an absolute maximum input voltage of 42V on VIN, SENSE, FBP, and FBN pins. Its operational input voltage range is specified from 3V to 36V, making it suitable for 24V industrial systems and 42V automotive applications. Exceeding 36V during normal operation may compromise regulation accuracy or reliability, even if within absolute maximum ratings.
How does the No RSENSE mode work in the LTC3783IDHD#PBF?
The LTC3783IDHD#PBF implements No RSENSE mode by sensing the voltage drop across the main N-channel MOSFET's RDS(ON) via the SENSE pin. This eliminates the need for an external current-sense resistor, improving efficiency and reducing component count. It is valid only when VDS ≤ 36V and requires careful MOSFET selection to maintain consistent RDS(ON) across temperature and manufacturing variation.
What dimming methods does the LTC3783IDHD#PBF support, and what ratios are achievable?
The LTC3783IDHD#PBF supports true-color PWM dimming (3000:1) via PWMIN/PWMOUT and analog dimming (100:1) via FBP and ILIM inputs. Combined, these achieve an effective dimming ratio of 300,000:1. The PWM method preserves LED color point by storing ITH state during off-time, while analog dimming adjusts reference current without switching artifacts.
Can the LTC3783IDHD#PBF operate in constant current and constant voltage modes simultaneously?
Yes - the LTC3783IDHD#PBF automatically selects between constant current (CC) and constant voltage (CV) regulation based on FBP voltage. When FBP > 2.5V, it enters CC/CV mode: the loop regulates load current until the OV/FB pin reaches 1.23V, then switches to CV mode to clamp output voltage. This dual-mode behavior protects both LED strings and downstream circuitry.
What is the purpose of the exposed pad (Pin 17) on the LTC3783IDHD#PBF DFN package?
The exposed pad (Pin 17) on the LTC3783IDHD#PBF is electrically and thermally connected to GND. It must be soldered to a PCB GND plane to ensure proper thermal dissipation (θJA = 43°C/W) and electrical stability. Omitting this connection degrades thermal performance, increases junction temperature, and may cause premature thermal shutdown or parameter drift.
LTC3783IDHD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 20kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x4)
LTC3783IDHD#PBF FAQ
1.How can I place an order for LTC3783IDHD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3783IDHD#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 LTC3783IDHD#PBF reliable?
The price and inventory of LTC3783IDHD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3783IDHD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3783IDHD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3783IDHD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3783IDHD#PBF?
LTC3783IDHD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3783IDHD#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 LTC3783IDHD#PBF?
For technical support, including LTC3783IDHD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3783IDHD#PBF requirements.
6.How does Aetrix verify that LTC3783IDHD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3783IDHD#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 LTC3783IDHD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3783IDHD#PBF?
All LTC3783IDHD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3783IDHD#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 LTC3783IDHD#PBF part is unused and in its original packaging.
Return procedure for LTC3783IDHD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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