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Analog Devices Inc. LTC3783EDHD#TRPBF
- Part No.:
- LTC3783EDHD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3783EDHD#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,752
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Product details
Overview
LTC3783EDHD#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode PWM LED driver and boost/flyback/SEPIC controller featuring 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, operates from 3V–36V input, and provides constant-current or constant-voltage regulation with programmable frequency (20kHz–1MHz) - used in high-brightness LED backlighting and telecom power supplies.
For engineers reviewing the LTC3783EDHD#TRPBF datasheet, LTC3783EDHD#TRPBF pinout, LTC3783EDHD#TRPBF application, or LTC3783EDHD#TRPBF equivalent, key selection criteria include its dual-gate drive capability, No RSENSE™ operation for VDS < 36V, 1.23V ±1% reference, 20µA shutdown current, and DFN-16 (5mm × 4mm) package with exposed thermal pad.
Technical Context
The LTC3783EDHD#TRPBF implements a fixed-frequency, current-mode control architecture with slope compensation, supporting boost, flyback, and SEPIC topologies. Its error amplifier drives ITH to set peak current threshold, while PWMIN enables true zero-latency PWM load switching by freezing ITH state during low pulses - eliminating transient overvoltage/undervoltage during LED dimming.
It integrates a 7V LDO regulator (INTVCC) powering gate drivers and logic, supports external synchronization up to 1.3× fOSC, and offers dual regulation modes: voltage mode (FBP ≤ 1.23V) and constant-current/constant-voltage mode (FBP > 2.5V), where ILIM sets differential sense voltage from 10mV to 100mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports wide-input industrial and automotive supply rails without pre-regulation. |
| Reference Voltage | 1.23V ±1% - enables precise output voltage or current setpoint accuracy in feedback loops. |
| Shutdown Current | 20µA typical - ensures ultra-low power loss during system sleep or standby modes. |
| Operating Frequency | 20kHz to 1MHz (programmable via FREQ pin resistor) - balances efficiency vs. size for magnetics and EMI filtering. |
| Dimming Ratio | 3000:1 digital PWM + 100:1 analog (FBP/ILIM) - maintains LED color fidelity across full brightness range. |
| Max Duty Cycle | 97% - supports high step-up ratios in boost configurations with minimal dropout headroom. |
| Thermal Rating | –40°C to +85°C (E-grade), θJA = 43°C/W - validated for industrial ambient conditions with standard PCB copper pour. |
Pinout & Package
Package: 16-lead (5mm × 4mm) plastic DFN (DHD) with exposed thermal pad (Pin 17 = GND), rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (16) | Enable/Shutdown Control Input | 1.248V rising threshold with 100mV hysteresis - provides accurate, noise-immune start-up sequencing. |
| ITH (15) | Error Amplifier Output / Compensation Node | 0V–1.4V control voltage setting peak current limit - connects to RC network for loop stability. |
| OV/FB (14) | Overvoltage Protection / Voltage Feedback Input | 1.32V OV threshold (7% above VREF) or 1.23V regulation point - dual-role pin for safety and precision regulation. |
| SS (13) | Soft-Start Timing Input | 50µA internal current source charges external capacitor - prevents inrush current and stabilizes startup. |
| SENSE (12) | Main Current Sense Input | Accepts VDS of power MOSFET (≤36V) or shunt resistor - enables No RSENSE™ operation for higher efficiency. |
| VIN (11) | Main Power Supply Input | 3V–36V input rail - powers internal bias circuits and feeds INTVCC LDO when VIN > 7V. |
| INTVCC (10) | Internal 7V LDO Output | Supplies gate drivers and logic - requires ≥4.7µF ceramic bypass to GND for transient current delivery. |
| GATE (9) | Main Power Switch Driver Output | 0.5A peak sourcing / 1A sinking - directly drives N-channel MOSFET gates in boost/flyback/SEPIC topologies. |
| FBN (1) | Error Amp Inverting Input / Negative Sense | Connects to ground-side of current-sense resistor or output divider - defines regulation reference point. |
| FBP (2) | Error Amp Noninverting Input / Positive Sense | Determines regulation mode: ≤1.23V = voltage mode; >2.5V = CC/CV mode - sets target feedback level. |
| ILIM (3) | Current Limit Set Input | 0.1V–1.23V input scales sense voltage offset (10mV–100mV) - enables analog dimming and CC regulation tuning. |
| VREF (4) | Buffered 1.23V Reference Output | Stable, low-impedance reference - used directly or attenuated for FBP bias; must not be capacitive-bypassed. |
| FREQ (5) | Oscillator Frequency Programming | 0.615V nominal voltage - RT resistor to GND sets fOSC from 20kHz to 1MHz with ±15% tolerance. |
| SYNC (6) | External Clock Synchronization Input | Internal 100kΩ pull-down - accepts 2V–7V clock edges up to 1.3× fOSC for EMI reduction and multi-phase sync. |
| PWMIN (7) | PWM Dimming Command Input | 1.6V/0.8V thresholds with hysteresis - freezes ITH state and disables GATE during low pulses for glitch-free LED dimming. |
| PWMOUT (8) | Load PWM Switch Driver Output | 0.25A sourcing / 0.5A sinking - controls external N-channel FET for LED current path on/off switching. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ Dimming | 3000:1 ratio with zero transient overshoot/undershoot - preserves LED chromaticity across entire dimming range. |
| No RSENSE™ Operation | Eliminates external current-sense resistor by using MOSFET RDS(ON) - reduces BOM cost and improves efficiency at VDS < 36V. |
| Dual Regulation Modes | Configurable as constant-voltage (FBP ≤ 1.23V) or constant-current/constant-voltage (FBP > 2.5V) - supports LED strings and telecom DC/DC outputs. |
| Programmable Soft-Start | 50µA SS pin current charges external capacitor - linearly ramps current limit to prevent inrush and stabilize startup. |
| Integrated 7V LDO Regulator | Delivers up to 75mA from VIN - powers gate drivers and logic without external bias supply, simplifying system design. |
| Overvoltage Lockout | 1.32V OV/FB threshold (7% above VREF) with 20mV hysteresis - protects downstream loads from hazardous overvoltage events. |
Applications
| LED Backlighting | Telecom DC/DC Supplies |
|---|---|
|
Use Scenario: Driving high-brightness white LED arrays in LCD displays requiring flicker-free, color-stable dimming. IC Role / Device Role / Timing Role: Primary LED current controller with dual-gate drive (GATE + PWMOUT) and True Color PWM™ modulation. Use Value: Achieves 3000:1 dimming without color shift, enabling HDR display performance and energy-efficient backlight management. |
Use Scenario: Generating isolated 48V-to-12V or 48V-to-5V DC/DC supplies in telecom line cards and base station power modules. IC Role / Device Role / Timing Role: Flyback controller with constant-current/constant-voltage regulation and programmable frequency for EMI compliance. Use Value: Supports wide input range (36V–75V) and delivers stable output under dynamic load transients with minimal external components. |
| Automotive Lighting | Industrial LED Drivers |
|
Use Scenario: Powering exterior LED headlamps and DRLs in 12V/24V vehicle systems with stringent thermal and reliability requirements. IC Role / Device Role / Timing Role: Boost controller with overtemperature shutdown (165°C) and robust RUN pin enable sequencing. Use Value: Maintains operation from –40°C to +85°C ambient, withstands load dump transients, and enables adaptive brightness control. |
Use Scenario: Driving high-power LED arrays in factory automation lighting, machine vision illuminators, and signage systems. IC Role / Device Role / Timing Role: SEPIC or boost controller with analog+PWM dimming and No RSENSE™ for high-efficiency thermal management. Use Value: Reduces component count and heat generation while delivering precise current regulation across varying line and load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver and DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783IDHD#TRPBF | Same silicon, extended temperature grade (–40°C to +125°C) and higher thermal rating (θJA = 43°C/W unchanged). | Required for under-hood automotive or high-ambient industrial deployments where junction temperature exceeds 85°C. | Select when operating ambient exceeds 85°C or when long-term reliability at elevated junction temperatures is critical. |
| LTC3783EFE#TRPBF | Same functionality in 16-lead TSSOP package (θJA = 38°C/W), different pinout and larger footprint (6.1mm × 4.4mm vs. 5mm × 4mm). | Suitable for prototyping or legacy layouts where DFN assembly is unavailable; lower thermal resistance but larger area. | Choose for hand-soldering, test fixtures, or designs constrained by DFN reflow capability but needing identical electrical behavior. |
Compared with LTC3783EDHD#TRPBF, the IDHD variant extends thermal operating range without changing pinout or electrical specs, while the EFE variant trades compact DFN packaging for easier assembly and marginally better thermal dissipation in TSSOP - both retain identical control architecture, dimming performance, and regulation modes.
Availability
LTC3783EDHD#TRPBF is available at Aetrix Electronics and suitable for LED backlighting, telecom power supplies, and automotive lighting applications requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.
Supply support for LTC3783EDHD#TRPBF 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 and maintains full product support, documentation, and manufacturing continuity for all Linear ICs including the LTC series.
The LTC3783 belongs to Linear's high-performance LED driver and DC/DC controller family, designed specifically for high-efficiency, high-dimming-ratio LED systems and flexible topology DC/DC conversion in industrial, telecom, and automotive environments.
FAQ
What is the maximum input voltage supported by the LTC3783EDHD#TRPBF?
The LTC3783EDHD#TRPBF supports an absolute maximum input voltage of 42V on VIN, SENSE, FBP, and FBN pins. Its recommended operating input voltage range is 3V to 36V, making it suitable for 24V industrial and 42V automotive systems. Exceeding 36V in normal operation risks violating the specified functional range, though transient tolerance up to 42V is guaranteed per Absolute Maximum Ratings.
Does the LTC3783EDHD#TRPBF support synchronization to an external clock?
Yes, the LTC3783EDHD#TRPBF supports external clock synchronization via the SYNC pin, which accepts TTL/CMOS-compatible signals from 100% to 130% of its nominal oscillator frequency. The internal 100kΩ pull-down resistor ensures safe default operation when SYNC is unconnected. For reliable synchronization, the external clock must exceed 2V for ≥25ns with ≤80% duty cycle.
How does the No RSENSE™ mode work in the LTC3783EDHD#TRPBF?
The LTC3783EDHD#TRPBF implements No RSENSE™ mode by sensing the voltage drop across the main power MOSFET's RDS(ON) via the SENSE pin, eliminating the need for an external current-sense resistor. This mode is valid only when VDS ≤ 36V and improves efficiency by removing I²R losses. Accuracy depends on MOSFET RDS(ON) tolerance and temperature drift, so calibration may be required for precision current regulation.
What is the purpose of the ILIM pin on the LTC3783EDHD#TRPBF?
The ILIM pin on the LTC3783EDHD#TRPBF sets the differential current-sense voltage threshold (VFBP – VFBN) in constant-current mode, scaling linearly from 10mV to 100mV as ILIM voltage increases from 0.123V to 1.23V. It enables analog dimming and fine-tunes current regulation accuracy, especially in CC/CV applications where load current must be tightly controlled independent of output voltage.
Can the LTC3783EDHD#TRPBF operate in flyback topology?
Yes, the LTC3783EDHD#TRPBF is explicitly designed to support flyback topology in addition to boost and SEPIC. Its current-mode control architecture, adjustable slope compensation, and dual-gate drive (GATE for primary switch, PWMOUT for secondary-side synchronous rectification or load switching) make it suitable for isolated flyback converters - commonly used in telecom and industrial power supplies requiring galvanic isolation.
LTC3783EDHD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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)
LTC3783EDHD#TRPBF FAQ
1.How can I place an order for LTC3783EDHD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3783EDHD#TRPBF 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 LTC3783EDHD#TRPBF reliable?
The price and inventory of LTC3783EDHD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3783EDHD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3783EDHD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3783EDHD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3783EDHD#TRPBF?
LTC3783EDHD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3783EDHD#TRPBF 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 LTC3783EDHD#TRPBF?
For technical support, including LTC3783EDHD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3783EDHD#TRPBF requirements.
6.How does Aetrix verify that LTC3783EDHD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3783EDHD#TRPBF 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 LTC3783EDHD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3783EDHD#TRPBF?
All LTC3783EDHD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3783EDHD#TRPBF, 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 LTC3783EDHD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3783EDHD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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