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Analog Devices Inc. LTC3783IFE#TRPBF
- Part No.:
- LTC3783IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3783IFE#TRPBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,691
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Product details
Overview
LTC3783IFE#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) in a 16-lead TSSOP package rated for –40°C to 125°C. It is used in high-voltage LED arrays and telecom power supplies.
For engineers reviewing the LTC3783IFE#TRPBF datasheet, LTC3783IFE#TRPBF pinout, LTC3783IFE#TRPBF application, or LTC3783IFE#TRPBF equivalent, key selection criteria include its dual-switch control architecture, No RSENSE™ capability for VDS < 36V, 1.23V ±1% reference, 100mV RUN hysteresis, and 20µA shutdown current - all critical for precision LED dimming and industrial DC/DC converter design.
Technical Context
The LTC3783IFE#TRPBF implements a fixed-frequency current-mode control loop with slope compensation, where ITH voltage sets the peak current threshold via a transconductance error amplifier (gm = 1.7–14 mmho). Its dual PWM path enables simultaneous GATE switching control and external load switching via PWMOUT, with ITH state retention during PWMIN low periods to eliminate transient overvoltage/undervoltage during dimming transitions.
It supports three operating modes: voltage regulation (VFBP ≤ 1.23V), constant-current/constant-voltage regulation (VFBP > 2.5V), and No RSENSE mode using MOSFET RDS(ON). The internal 7V LDO powers gate drivers (50mA max), while SYNC allows synchronization up to 1.3× fOSC, and OV/FB provides overvoltage lockout at 1.32V (1.23V + 7%) with 20mV hysteresis.
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 | 1.23V ±1% - enables precise output voltage/current setpoint accuracy in feedback loops. |
| Shutdown Current | 20µA typical - ensures ultra-low power loss in standby or battery-backed systems. |
| Operating Frequency | 20kHz to 1MHz - adjustable via single resistor on FREQ pin; balances efficiency vs. size in magnetics design. |
| RUN Pin Threshold | 1.248V rising / 1.223V falling with 100mV hysteresis - provides noise-immune enable/disable control with accurate VIN monitoring. |
| Max Duty Cycle | 97% - supports high step-up ratios in boost and flyback topologies with minimal dropout margin. |
| Current Sense Threshold | 150mV typical - defines peak inductor/load current limit; scalable via ILIM pin for 10:1 analog dimming range. |
| INTVCC Regulator | 7V ±0.5V, 75mA max - powers internal logic and gate drivers; requires ≥4.7µF ceramic bypass at pin. |
Pinout & Package
The LTC3783IFE#TRPBF is housed in a 16-lead plastic TSSOP package (FE grade) with exposed pad (Pin 17) soldered to PCB ground for thermal and electrical performance. θJA = 38°C/W. Operating temperature range: –40°C to 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBN (1) | Error amplifier inverting input / negative current sense | Senses feedback voltage across output divider (voltage mode) or shunt resistor (current mode); nominal regulation point = VFBP or VFBP – 100mV. |
| FBP (2) | Error amplifier noninverting input / positive current sense | Determines regulation mode: ≤1.23V = voltage mode; >2.5V = constant-current/constant-voltage mode; sets dimming reference. |
| ILIM (3) | Current limit offset control | Scales VFBP–VFBN threshold from 10mV to 100mV linearly with VILIM (0.1V–1.23V), enabling 10:1 analog dimming. |
| VREF (4) | Buffered 1.23V reference output | Provides stable reference for external resistor dividers; must be decoupled with 10kΩ to GND-not capacitive bypass. |
| FREQ (5) | Oscillator frequency programming | 0.615V bias; RT resistor to GND sets fOSC from 20kHz–1MHz; internal oscillator current charges/discharges timing capacitor. |
| SYNC (6) | External clock synchronization input | Internal 100kΩ pull-down; accepts 2V–7V pulses ≥25ns; locks fOSC to 100–130% of nominal frequency. |
| PWMIN (7) | PWM dimming command input | 100kΩ internal pull-up; low state disables GATE switching, holds ITH state, and drives PWMOUT low for true-color dimming. |
| PWMOUT (8) | Load PWM switch driver output | Drives external N-MOSFET for LED current shutoff; 0.25A sink/0.5A source capability; enables 3000:1 digital dimming. |
| GATE (9) | Main power MOSFET gate driver | 50mA RMS drive; 0.5A peak sourcing / 1A peak sinking; rise/fall times <30ns into 3300pF; supports high-side boost switching. |
| INTVCC (10) | Internal 7V LDO output | Powers gate drivers and internal circuitry; requires ≥4.7µF low-ESR ceramic cap to GND; shorting to VIN allowed if VIN ≤8V. |
| VIN (11) | Main input supply | 3V–36V input rail; must be closely decoupled to GND; supplies quiescent and gate-charge current (IQ(TOT) = IQ + f·QG). |
| SENSE (12) | Current sense input | Accepts VDS sensing (No RSENSE mode, VSENSE ≤36V) or source-shunt sensing; includes leading-edge blanking. |
| SS (13) | Soft-start ramp control | 50µA pull-up current enabled by RUN; charges external capacitor to limit inrush current; full ITH range established at 1.23V. |
| OV/FB (14) | Overvoltage protection / voltage feedback | In voltage mode: trips at 1.32V (1.23V + 7%) to disable GATE; in CC/CV mode: regulates VOUT to 1.23V when current limit not active. |
| ITH (15) | Error amplifier output / compensation node | 0–1.4V control voltage; sets ITRIP comparator threshold; connects to external RC network for loop stability. |
| RUN (16) | Enable/shutdown control | 1.248V rising threshold with 100mV hysteresis; pulls IC into 20µA shutdown when <1.223V; enables soft-start and gate drivers when high. |
| Exposed Pad (17) | Thermal & electrical ground | Mandatory solder connection to PCB GND plane; ensures thermal dissipation (θJA = 38°C/W) and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 digital dimming ratio with no color shift - achieved by storing ITH state during PWMIN low periods and instant restart. |
| No RSENSE™ operation | Eliminates external current-sense resistor by using MOSFET RDS(ON) for VSENSE ≤36V - improves efficiency and reduces BOM count. |
| Constant-current/constant-voltage regulation | Auto-selects regulation mode based on FBP voltage: regulates either output current (via FBN–FBP) or output voltage (via OV/FB) - first-limit wins. |
| Programmable soft-start | 50µA SS pin current charges external capacitor to ramp ITH limit - prevents inrush current and stabilizes startup in high-power LED strings. |
| Wide analog dimming support | 100:1 dimming via FBP pin (0–1.23V) plus 10:1 via ILIM pin - extends effective dimming range beyond PWM alone. |
| Robust protection suite | Includes overvoltage lockout (7% OV threshold), overtemperature shutdown (165°C), and undervoltage lockout on INTVCC (2.1–2.5V). |
Applications
| High-Voltage LED Arrays | Telecom Power Supplies |
|---|---|
Use Scenario: Driving 12–24 white LED series strings in fiber-optic line cards requiring stable brightness and flicker-free operation under variable load. IC Role / Device Role: Boost controller with integrated PWMOUT load switch and No RSENSE current sensing - regulates string current while enabling deep digital dimming. Use Value: 3000:1 True Color PWM dimming preserves chromaticity across full brightness range; 1.23V reference ensures ±1% current accuracy over temperature. |
Use Scenario: Generating isolated –48V backup supply with tight regulation and fast transient response for VoIP gateway power management. IC Role / Device Role: Flyback controller with constant-voltage regulation and programmable soft-start - manages primary-side control without optocoupler. Use Value: 20kHz–1MHz frequency programming allows optimization for EMI filtering; SYNC pin enables clock alignment with system master clock. |
| 42V Automotive Systems | 24V Industrial Controls |
Use Scenario: Powering LED headlamps and interior lighting in 12V/24V/42V architectures with cold-crank tolerance down to 3V input. IC Role / Device Role: Wide-input boost controller with RUN pin UVLO hysteresis and 125°C-rated TSSOP package - ensures reliable start-up and thermal operation. Use Value: 100mV RUN hysteresis prevents chatter during battery voltage sag; 36V SENSE rating supports high-side sensing in buck-boost configurations. |
Use Scenario: Providing regulated 24V auxiliary supply for PLC I/O modules with high ripple rejection and long-term stability. IC Role / Device Role: SEPIC controller with constant-voltage regulation and overvoltage protection - maintains output during input transients and brownouts. Use Value: OV/FB pin provides hardware-level overvoltage cutoff at 1.32V; 7V INTVCC LDO ensures gate driver robustness even with noisy 24V rail. |
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 |
|---|---|---|---|
| LTC3783EFE#TRPBF | Same silicon, –40°C to 85°C temperature grade; lower max junction temperature rating (125°C vs. 150°C). | Suitable for commercial-grade LED signage or non-automotive industrial use where ambient temperature stays below 85°C. | Select when cost sensitivity outweighs extended temperature requirement and thermal derating is acceptable. |
| LTC3783IFE#PBF | Identical electrical specs and temperature rating, but supplied in cut-tape (non-reel) packaging. | Preferred for prototyping, low-volume production, or manual assembly where tape-and-reel handling is unnecessary. | Choose for engineering validation or small-batch builds where reel logistics add complexity or cost. |
Compared with LTC3783EFE#TRPBF, the LTC3783IFE#TRPBF offers guaranteed operation up to 125°C ambient - critical for under-hood automotive or enclosed industrial enclosures - while LTC3783IFE#PBF trades reel convenience for immediate hand-soldering readiness without de-taping.
Availability
LTC3783IFE#TRPBF is available at Aetrix Electronics and suitable for high-voltage LED arrays, telecom power supplies, and 42V automotive systems requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for LTC3783IFE#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 legacy Linear parts including the LTC3783 series.
The LTC3783IFE#TRPBF belongs to Linear's high-performance LED driver and multi-topology DC/DC controller family, designed specifically for applications demanding precision current regulation, wide dimming range, and robust thermal/EMI performance in space-constrained industrial and automotive environments.
FAQ
What is the maximum input voltage supported by the LTC3783IFE#TRPBF?
The LTC3783IFE#TRPBF supports an input voltage range of 3V to 36V. Absolute maximum rating for VIN, SENSE, FBP, and FBN pins is 42V - exceeding this may cause permanent damage. Operation above 36V requires external clamping or level-shifting, as internal protection circuits are not rated beyond 42V.
How does the No RSENSE™ mode work in the LTC3783IFE#TRPBF?
The LTC3783IFE#TRPBF implements No RSENSE™ mode by sensing the voltage drop across the main power MOSFET's RDS(ON) via the SENSE pin. This eliminates the need for an external current-sense resistor when VDS ≤ 36V, improving efficiency and reducing component count. Accuracy depends on MOSFET RDS(ON) tolerance and temperature coefficient.
Can the LTC3783IFE#TRPBF be synchronized to an external clock, and what are the limits?
Yes, the LTC3783IFE#TRPBF can be synchronized to an external clock applied to the SYNC pin. The recommended maximum synchronization ratio is 1.3× fOSC; attempting synchronization above this risks insufficient slope compensation and subharmonic oscillation. The SYNC signal must exceed 2V for ≥25ns and maintain ≤80% duty cycle.
What is the purpose of the ILIM pin on the LTC3783IFE#TRPBF?
The ILIM pin on the LTC3783IFE#TRPBF sets the current-sense voltage threshold (VFBP – VFBN) in constant-current mode. With VILIM = 1.23V, the threshold is 100mV; scaling VILIM down to 0.123V reduces it to 10mV - enabling a 10:1 analog dimming range while maintaining loop stability.
Does the LTC3783IFE#TRPBF support both constant-current and constant-voltage regulation simultaneously?
Yes, the LTC3783IFE#TRPBF supports constant-current/constant-voltage (CC/CV) regulation in a priority-based manner. When VFBP > 2.5V, it regulates load current via FBP/FBN; if output voltage exceeds the OV/FB threshold (≈1.23V), it switches to voltage regulation - whichever limit is reached first determines the operating mode.
LTC3783IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
LTC3783IFE#TRPBF FAQ
1.How can I place an order for LTC3783IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3783IFE#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 LTC3783IFE#TRPBF reliable?
The price and inventory of LTC3783IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3783IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3783IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3783IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3783IFE#TRPBF?
LTC3783IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3783IFE#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 LTC3783IFE#TRPBF?
For technical support, including LTC3783IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3783IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3783IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3783IFE#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 LTC3783IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3783IFE#TRPBF?
All LTC3783IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3783IFE#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 LTC3783IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3783IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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