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Analog Devices Inc. LTC3783IDHD#TRPBF
- Part No.:
- LTC3783IDHD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3783IDHD#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
LTC3783IDHD#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode PWM LED driver and boost/flyback/SEPIC controller that integrates dual N-channel gate drivers - one for the main power MOSFET (GATE) and one for external load PWM switching (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 programmable 20kHz–1MHz switching frequency. It is used in high-brightness LED backlighting for telecom and industrial displays.
For engineers reviewing the LTC3783IDHD#TRPBF datasheet, LTC3783IDHD#TRPBF pinout, LTC3783IDHD#TRPBF application, or LTC3783IDHD#TRPBF equivalent, key selection considerations include its dual-gate drive architecture, 1.23V ±1% reference accuracy, 100mV current-sense threshold tolerance, –40°C to +125°C extended temperature grade, and DFN-16 (5mm × 4mm) package with exposed thermal pad.
Technical Context
The LTC3783IDHD#TRPBF implements a constant-frequency, current-mode control loop with slope compensation, where ITH voltage sets the peak current comparator threshold. Its patented PWMIN-controlled ITH storage enables zero-transient overvoltage/undervoltage during fast LED on/off transitions. The error amplifier supports both voltage-mode (FBP ≤ 1.23V) and constant-current/constant-voltage mode (FBP > 2.5V), with OV/FB providing overvoltage lockout at 1.32V (1.23V + 7%) or serving as secondary feedback in CC/CV mode.
It features an internal 7V LDO (INTVCC) supplying gate drivers and logic, programmable soft-start via SS pin (50µA pull-up), and synchronization capability up to 1.3× fOSC via SYNC pin with 100kΩ internal pull-down. The SENSE pin supports either VDS-based sensing (≤36V) or external shunt sensing, enabling flexible topology implementation without added sense resistors in No RSENSE mode.
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 Accuracy | 1.23V ±1% - ensures precise output voltage/current regulation across temperature and line. |
| Current Sense Threshold | 150mV typical (125–180mV range) - defines minimum detectable current for accurate current-loop control. |
| Shutdown Quiescent Current | 20µA typical - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
| Operating Frequency Range | 20kHz to 1MHz - selectable via single RT resistor; balances efficiency (low f) vs. size (high f). |
| Temperature Grade | –40°C to +125°C junction - qualified for under-hood automotive, industrial controls, and telecom base stations. |
| GATE Driver Peak Current | 0.5A source / 1A sink - drives high-QG MOSFETs at high frequency without external buffers. |
| PWM Dimming Ratio | 3000:1 true-color digital - eliminates LED color shift by preserving constant forward current during PWM off-cycles. |
Pinout & Package
Package: 16-lead DFN (5mm × 4mm), exposed thermal pad (Pin 17 = GND), rated θJA = 43°C/W. RoHS-compliant, lead-free finish.
| 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 | 0–1.4V control voltage setting peak current limit - stores load current state when PWMIN is low. |
| OV/FB (14) | Overvoltage Detection / Secondary Feedback | 1.32V OV lockout threshold (7% above VREF); in CC/CV mode, regulates VOUT to 1.23V. |
| SS (13) | Soft-Start Ramp Input | 50µA pull-up current charges external capacitor - limits inrush current and prevents output overshoot. |
| SENSE (12) | Main Current Sense Input | Accepts VDS of power MOSFET (≤36V) or shunt resistor voltage - enables No RSENSE mode for higher efficiency. |
| VIN (11) | Main Power Supply Input | 3–36V input rail - powers internal bias circuits; requires local ceramic decoupling. |
| INTVCC (10) | Internal 7V LDO Output | Supplies gate drivers and logic; must be bypassed with ≥4.7µF ceramic capacitor to GND. |
| GATE (9) | Main Power MOSFET Gate Driver Output | 50mA RMS drive strength, 0.5A/1A peak sourcing/sinking - directly drives high-side boost switch. |
| FBN (1) | Error Amp Inverting Input / Negative Sense | Senses feedback from output divider (voltage mode) or shunt resistor ground side (current mode). |
| FBP (2) | Error Amp Noninverting Input / Positive Sense | Determines regulation mode: ≤1.23V = voltage mode; >2.5V = CC/CV mode with 100mV default ΔV. |
| ILIM (3) | Analog Current Limit Programming | 0.1–1.23V input scales current-sense offset from 10mV to 100mV - enables 10:1 analog dimming. |
| VREF (4) | Buffered 1.23V Reference Output | ±1% accuracy, 0.5mA max load - used for FBP biasing or external circuit reference; no capacitor to GND. |
| FREQ (5) | Oscillator Frequency Programming | 0.615V nominal voltage; RT resistor to GND sets fOSC from 20kHz to 1MHz. |
| SYNC (6) | External Clock Synchronization Input | 100kΩ internal pull-down; accepts 2V–7V pulses ≥25ns; locks fOSC to 100–130% of nominal. |
| PWMIN (7) | External PWM Dimming Command Input | 1.6V/0.8V thresholds with hysteresis - disables GATE switching and preserves ITH state during PWM low phase. |
| PWMOUT (8) | Load PWM Switch Driver Output | 25mA RMS, 0.25A/0.5A peak - controls external N-FET for LED string on/off or output disconnect. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM Dimming | 3000:1 digital dimming ratio with zero transient overvoltage/undervoltage - maintains LED chromaticity across full brightness range. |
| No RSENSE Operation | Eliminates external current-sense resistor by using MOSFET RDS(ON) - increases efficiency and reduces BOM cost in ≤36V applications. |
| Integrated Dual Gate Drivers | Separate GATE (main converter) and PWMOUT (load switch) outputs - enables independent control of power stage and LED current path. |
| Programmable CC/CV Regulation | Configurable via FBP voltage: <1.23V = voltage mode; >2.5V = simultaneous current/voltage limiting - ideal for LED constant-current + overvoltage protection. |
| Wide Temperature Range | –40°C to +125°C operation (I-grade) - qualified for harsh environments including 42V automotive and industrial control systems. |
| Low Shutdown IQ | 20µA typical shutdown current - extends battery life in always-on or standby LED lighting systems. |
Applications
| Telecom Power Supplies | High-Voltage LED Arrays |
|---|---|
|
Use Scenario: 48V telecom rectifier powering distributed LED status indicators and optical module backlights. IC Role / Device Role / Timing Role: Boost controller regulating 24V–36V output with constant-current LED drive and overvoltage protection. Use Value: Enables single-stage conversion from 48V to high-brightness LED strings while maintaining 3000:1 dimming without color shift. |
Use Scenario: Backlighting for outdoor signage using series-connected white LEDs requiring >25V total forward voltage. IC Role / Device Role / Timing Role: SEPIC or flyback controller delivering regulated constant current to high-VF LED arrays. Use Value: Supports >36V output via shunt-based SENSE configuration and provides analog+PWM dimming synergy for uniform luminance control. |
| 42V Automotive Systems | 24V Industrial Controls |
|
Use Scenario: Under-hood LED lighting and display backlighting in commercial vehicles with 24V/42V dual-battery architectures. IC Role / Device Role / Timing Role: High-reliability boost controller operating across –40°C to +125°C with robust EMI performance. Use Value: I-grade qualification and 36V SENSE capability allow direct integration into 42V systems without level-shifting or additional protection. |
Use Scenario: Programmable HMI panel backlighting in factory automation equipment powered from 24V DC bus. IC Role / Device Role / Timing Role: PWM LED driver with analog dimming interface (0–10V or 4–20mA via conditioning) and fault reporting. Use Value: Combines 100:1 analog dimming (via FBP) with 3000:1 PWM for seamless 300,000:1 effective dimming range in variable ambient light. |
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#TRPBF | Same silicon, TSSOP-16 package, –40°C to +85°C grade - lower thermal resistance (θJA = 38°C/W) but reduced temperature range. | Preferred for commercial-grade, space-constrained PCBs where ambient temperature stays below 85°C. | Select when board layout favors TSSOP or thermal budget allows lower max junction temperature. |
| LTC3783IDHD#PBF | Identical DFN-16 package and temperature grade, but supplied in cut-tape instead of 2500-piece tape-and-reel. | Used for prototyping, low-volume production, or mixed-BOM assembly where reel logistics are impractical. | Choose for NPI, validation, or small-batch builds requiring same reliability and performance without reel handling. |
Compared with LTC3783EFE#TRPBF, the LTC3783IDHD#TRPBF offers superior thermal margin in high-ambient environments due to its 125°C rating and DFN package's soldered thermal pad, while LTC3783IDHD#PBF provides identical electrical behavior with simplified procurement for early-stage design.
Availability
LTC3783IDHD#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, high-voltage LED arrays, and 42V automotive systems requiring stable component supply, long-term lifecycle support, and guaranteed extended-temperature performance.
Supply support for LTC3783IDHD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3783 belongs to Linear's precision LED driver and multi-topology controller product line, designed specifically for high-dimming-ratio, high-efficiency LED lighting and industrial DC/DC conversion where color fidelity and thermal robustness are critical.
FAQ
What is the maximum input voltage supported by the LTC3783IDHD#TRPBF?
The LTC3783IDHD#TRPBF 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 and 42V automotive and industrial systems. Exceeding 36V during normal operation may compromise regulation accuracy or reliability, though the 42V absolute rating provides margin against transients.
How does the No RSENSE mode work in the LTC3783IDHD#TRPBF?
The LTC3783IDHD#TRPBF implements No RSENSE mode by using the power MOSFET's intrinsic RDS(ON) as the current-sense element. The SENSE pin monitors VDS directly, and the controller interprets the resulting voltage drop as proportional to load current. This eliminates the need for an external sense resistor, improving efficiency and reducing component count - provided VDS remains ≤36V and MOSFET RDS(ON) is sufficiently stable and known.
Can the LTC3783IDHD#TRPBF synchronize to an external clock, and what are the limits?
Yes, the LTC3783IDHD#TRPBF can synchronize to an external clock applied to the SYNC pin. It locks to frequencies between 100% and 130% of its nominal oscillator frequency (fOSC). For reliable operation, the external clock must exceed 2V for ≥25ns per cycle and maintain ≤80% duty cycle. Attempting synchronization above 1.3× fOSC risks insufficient slope compensation and subharmonic oscillation.
What is the purpose of the ITH pin in the LTC3783IDHD#TRPBF, and how is it used?
The ITH pin in the LTC3783IDHD#TRPBF is the error amplifier output and serves as the current-limit threshold control node. Its voltage (0–1.4V) directly sets the peak inductor current trip point. Critically, when PWMIN goes low, the ITH switch opens and holds the ITH capacitor voltage - preserving the exact load current value. This enables instantaneous restart with no transient overshoot, a core feature enabling the LTC3783IDHD#TRPBF's 3000:1 true-color PWM dimming.
Does the LTC3783IDHD#TRPBF support both constant-current and constant-voltage regulation simultaneously?
Yes, the LTC3783IDHD#TRPBF supports combined constant-current/constant-voltage (CC/CV) regulation. When FBP is biased above 2.5V, the controller regulates load current via FBP–FBN differential voltage (set by ILIM) while monitoring OV/FB for output voltage. If the voltage limit is reached first, regulation switches to CV mode; if current limit is hit first, it remains in CC mode - enabling robust protection for LED strings and other sensitive loads.
LTC3783IDHD#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)
LTC3783IDHD#TRPBF FAQ
1.How can I place an order for LTC3783IDHD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3783IDHD#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 LTC3783IDHD#TRPBF reliable?
The price and inventory of LTC3783IDHD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3783IDHD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3783IDHD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3783IDHD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3783IDHD#TRPBF?
LTC3783IDHD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3783IDHD#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 LTC3783IDHD#TRPBF?
For technical support, including LTC3783IDHD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3783IDHD#TRPBF requirements.
6.How does Aetrix verify that LTC3783IDHD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3783IDHD#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 LTC3783IDHD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3783IDHD#TRPBF?
All LTC3783IDHD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3783IDHD#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 LTC3783IDHD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3783IDHD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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