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Analog Devices Inc. LTC3783EFE#PBF
- Part No.:
- LTC3783EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3783EFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:668
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Product details
Overview
LTC3783EFE#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 and load PWM switching. It delivers true-color PWM dimming up to 3000:1, supports analog dimming via FBP/ILIM pins, operates from 3V–36V input, features 1.23V ±1% internal reference, and targets high-voltage LED arrays and telecom power supplies.
For engineers reviewing the LTC3783EFE#PBF datasheet, LTC3783EFE#PBF pinout, LTC3783EFE#PBF application, or LTC3783EFE#PBF equivalent, key selection criteria include its dual-gate drive capability (GATE + PWMOUT), No RSENSE operation for VDS < 36V, programmable 20kHz–1MHz switching frequency, 20µA shutdown current, and TSSOP-16 package thermal performance (θJA = 38°C/W).
Technical Context
The LTC3783EFE#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 ITH to modulate peak inductor current, while the patented PWMIN-controlled ITH storage enables transient-free load switching during dimming.
It integrates a 7V LDO regulator (6.5–7.5V output, 75mA max) powering gate drivers and logic, with internal UVLO (1.8–2.5V) and overtemperature protection (165°C trip, 25°C hysteresis). The SYNC pin allows external clock synchronization up to 1.3× fOSC, with 25ns minimum pulse width and 100kΩ internal pull-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports wide-input industrial and automotive supply rails without external regulators. |
| Switching Frequency | 20kHz to 1MHz - set by single RT resistor; enables optimization of efficiency vs. size in boost/flyback designs. |
| Dimming Ratio | 3000:1 PWM + 100:1 analog - achieves full-spectrum color stability in high-power LED arrays without current-induced hue shift. |
| Reference Voltage | 1.23V ±1% - high-accuracy internal bandgap reference used for FB regulation and ILIM scaling. |
| Shutdown Current | 20µA typical - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
| Package Thermal Resistance | θJA = 38°C/W (TSSOP) - defines maximum power dissipation limit at given ambient temperature and PCB copper area. |
| Current Sense Threshold | 125–180mV - sets precision overcurrent protection and regulates load current in constant-current mode. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and telecom environments with no derating required. |
Pinout & Package
The LTC3783EFE#PBF is housed in a 16-lead plastic TSSOP package (FE) with exposed pad (Pin 17) soldered to PCB ground for thermal and electrical integrity. θJA = 38°C/W; max junction temperature = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (16) | Enable/Shutdown Control Input | 1.248V threshold with 100mV hysteresis; grounds internal bias to reduce IQ to 20µA in shutdown. |
| ITH (15) | Error Amplifier Output / Compensation Node | 0–1.4V voltage-controlled current limit ramp; stores load current state during PWMIN low for zero-transient dimming. |
| OV/FB (14) | Overvoltage Detection / Voltage Feedback Input | 1.32V OV lockout (7% above VREF) in voltage mode; becomes VREF-regulated feedback node in CC/CV mode. |
| SS (13) | Soft-Start Ramp Input | 50µA internal current source charges external capacitor; limits inrush current by capping ITH during startup. |
| SENSE (12) | Main Current Sense Input | Accepts VDS sensing (≤36V) or shunt resistor; includes leading-edge blanking for noise immunity. |
| VIN (11) | Main Power Supply Input | 3–36V primary input; powers internal circuitry and supplies gate driver charge current via INTVCC LDO. |
| INTVCC (10) | Internal 7V LDO Output | 6.5–7.5V regulated supply for GATE/PWMOUT drivers; requires ≥4.7µF ceramic bypass to GND. |
| GATE (9) | Main Power MOSFET Driver Output | 0.5A peak sourcing / 1A sinking; drives high-side N-MOSFET in boost/flyback/SEPIC configurations. |
| FBN (1) | Error Amp Inverting Input / Negative Sense | Senses feedback voltage across output divider (voltage mode) or negative side of current sense resistor (CC mode). |
| FBP (2) | Error Amp Noninverting Input / Positive Sense | Determines regulation mode: ≤1.23V = voltage mode; >2.5V = CC/CV mode; sets target differential across sense resistor. |
| ILIM (3) | Current Limit Scaling Input | 0.1–1.23V input scales VFBP–VFBN threshold from 10mV to 100mV for precise CC regulation. |
| VREF (4) | Buffered 1.23V Reference Output | 1.23V ±1% reference usable for external divider bias or calibration; must not be capacitive-bypassed to GND. |
| FREQ (5) | Oscillator Frequency Programming | 0.615V nominal voltage; RT resistor to GND sets fOSC from 20kHz–1MHz per published curve. |
| SYNC (6) | External Clock Synchronization Input | Accepts 2–7V clock signal; synchronizes internal oscillator up to 1.3× fOSC; internal 100kΩ pull-down. |
| PWMIN (7) | PWM Dimming Command Input | 1.6V rising / 0.8V falling threshold; controls PWMOUT, disables GATE switching, and isolates ITH network during off-time. |
| PWMOUT (8) | Load PWM Switch Driver Output | 0.25A sourcing / 0.5A sinking; drives external N-MOSFET for LED current path on/off control. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM Dimming | 3000:1 ratio with zero-output transient-achieved via ITH state retention during PWMIN low, eliminating overshoot/undershoot. |
| No RSENSE Operation | Eliminates external current-sense resistor by using MOSFET RDS(ON) for VDS ≤ 36V, improving efficiency and reducing BOM count. |
| Programmable CC/CV Regulation | Configurable via FBP voltage: <1.23V = CV only; >2.5V = dual-loop where loop regulates whichever parameter (I or V) hits limit first. |
| Integrated Dual Gate Drivers | GATE (0.5A/1A) + PWMOUT (0.25A/0.5A) enable independent control of power stage and LED load, simplifying high-power LED driver design. |
| Robust Protection Suite | Includes overvoltage lockout (7% OV threshold), overtemperature shutdown (165°C), and RUN-pin hysteresis (100mV) for noise-immune enable control. |
| Flexible Frequency Control | Single-resistor programming (20kHz–1MHz) + external SYNC (up to 1.3× fOSC) supports EMI reduction and multi-rail synchronization. |
Applications
| High-Voltage LED Arrays | Telecom Power Supplies |
|---|---|
|
Use Scenario: Driving 12–24 series white LEDs (VF ≈ 36V) from 12V input in fiber-optic line cards. IC Role / Device Role / Timing Role: Boost controller with PWMOUT-driven external MOSFET for LED current switching and GATE-driven main switch for voltage step-up. Use Value: 3000:1 true-color dimming maintains CIE chromaticity coordinates across full brightness range without color shift. |
Use Scenario: Generating isolated –48V backup supply with tight CV regulation in telecom shelf management units. IC Role / Device Role / Timing Role: Flyback controller regulating output voltage via OV/FB feedback while maintaining constant switching frequency for predictable EMI profile. Use Value: 1.23V ±1% reference and 7% OV threshold ensure stable -48V output under varying load and line conditions. |
| 42V Automotive Systems | 24V Industrial Controls |
|
Use Scenario: Powering LED headlamps and DRLs from 12V/24V battery with cold-crank tolerance down to 6V. IC Role / Device Role / Timing Role: SEPIC controller operating in buck-boost mode to maintain regulated LED current despite wide VIN swing (6–42V). Use Value: No RSENSE mode reduces heat generation and component count in space-constrained automotive modules. |
Use Scenario: Providing adjustable 24V–48V auxiliary supply for PLC I/O modules with programmable current limit. IC Role / Device Role / Timing Role: Boost controller with ILIM-programmed current limit and soft-start (SS pin) for inrush control during hot-swap events. Use Value: 50µA SS current and 100mV RUN hysteresis prevent false triggering in electrically noisy factory floor environments. |
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#PBF | Same functionality and pinout, but in 16-lead DFN package with θJA = 43°C/W and extended –40°C to +125°C temp grade. | Better thermal performance in compact layouts; suitable for higher ambient or higher power density designs. | Select when board space allows DFN and junction temperature margin is critical; not drop-in due to different footprint and thermal pad layout. |
| LTC3783EFE#TRPBF | Identical electrical specs and package; differs only in tape-and-reel packaging (3,000 pcs/reel vs. tube for #PBF). | No functional difference; intended for automated SMT assembly rather than prototyping or low-volume use. | Choose for volume production with pick-and-place; same PCB layout and thermal design as LTC3783EFE#PBF. |
Compared with LTC3783EFE#PBF, the DFN-based LTC3783IDHD#PBF offers wider temperature range and higher thermal resistance, while the tape-and-reel LTC3783EFE#TRPBF provides identical performance in automated manufacturing-neither is pin-compatible without layout revision, and both require validation of thermal interface and PCB copper pour.
Availability
LTC3783EFE#PBF is available at Aetrix Electronics and suitable for high-voltage LED arrays, telecom power supplies, and 42V automotive systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade temperature performance.
Supply support for LTC3783EFE#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 and maintains full product support, datasheets, and application engineering for legacy Linear parts including the LTC3783 series.
The LTC3783 product line was designed specifically for high-efficiency, high-dimming-ratio LED drivers and flexible topology DC/DC controllers targeting telecom, industrial, and automotive lighting applications.
FAQ
What is the maximum input voltage supported by the LTC3783EFE#PBF?
The LTC3783EFE#PBF supports an absolute maximum input voltage of 42V on the VIN and SENSE pins. Its operational input voltage range is specified from 3V to 36V. Exceeding 36V during normal operation risks violating the recommended operating conditions, though the 42V absolute rating provides limited transient margin. Always verify external MOSFET and diode voltage ratings exceed system requirements when using LTC3783EFE#PBF in boost or flyback configurations.
Does the LTC3783EFE#PBF support constant current and constant voltage regulation simultaneously?
Yes, the LTC3783EFE#PBF supports combined constant current/constant voltage (CC/CV) regulation. When FBP voltage exceeds 2.5V, the device enters CC/CV mode: it regulates load current via FBP–FBN differential (scaled by ILIM) and monitors output voltage via OV/FB. Whichever limit-current or voltage-is reached first determines regulation, making LTC3783EFE#PBF suitable for battery charging or LED drivers with overvoltage protection.
Can the LTC3783EFE#PBF operate without an external current-sense resistor?
Yes, the LTC3783EFE#PBF supports No RSENSE mode by sensing the voltage drop across the main power MOSFET's RDS(ON). This mode is valid when VDS ≤ 36V and eliminates the need for a discrete sense resistor, improving efficiency and reducing component count. However, accuracy depends on MOSFET RDS(ON) variation with temperature and manufacturing spread, so design validation across temperature is essential for LTC3783EFE#PBF implementations.
What is the purpose of the ITH pin on the LTC3783EFE#PBF?
The ITH pin on the LTC3783EFE#PBF is the error amplifier output that sets the peak current comparator threshold. During PWM dimming, when PWMIN goes low, the ITH network is disconnected and its voltage is held on an external capacitor-storing the exact load current value. This enables instantaneous, transient-free resumption of regulation when PWMIN returns high, a core feature enabling the 3000:1 true-color dimming performance of LTC3783EFE#PBF.
How does the RUN pin function on the LTC3783EFE#PBF?
The RUN pin on the LTC3783EFE#PBF provides a precision enable input with 1.248V nominal rising threshold and 100mV hysteresis. Pulling RUN below 1.223V shuts down the controller, reducing input supply current to 20µA typical. This allows accurate input undervoltage lockout and controlled start-up sequencing. The internal micropower reference ensures minimal current draw, making RUN ideal for battery-aware systems using LTC3783EFE#PBF.
LTC3783EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC3783EFE#PBF FAQ
1.How can I place an order for LTC3783EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3783EFE#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 LTC3783EFE#PBF reliable?
The price and inventory of LTC3783EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3783EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3783EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3783EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3783EFE#PBF?
LTC3783EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3783EFE#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 LTC3783EFE#PBF?
For technical support, including LTC3783EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3783EFE#PBF requirements.
6.How does Aetrix verify that LTC3783EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3783EFE#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 LTC3783EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3783EFE#PBF?
All LTC3783EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3783EFE#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 LTC3783EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3783EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3783EFE#PBF Tags
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