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Analog Devices Inc. LTC3783IFE#PBF
- Part No.:
- LTC3783IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3783IFE#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:488
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Product details
Overview
LTC3783IFE#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 (100:1), operates from 3V–36V input, features 1.23V reference (±1%), and targets high-voltage LED arrays and telecom/automotive DC/DC supplies.
For engineers reviewing the LTC3783IFE#PBF datasheet, LTC3783IFE#PBF pinout, LTC3783IFE#PBF application, or LTC3783IFE#PBF equivalent, key selection criteria include its dual-gate drive capability (GATE + PWMOUT), No RSENSE operation for VDS < 36V, programmable 20kHz–1MHz switching frequency, constant-current/constant-voltage regulation mode, and –40°C to 125°C industrial temperature grade in TSSOP package.
Technical Context
The LTC3783IFE#PBF implements a fixed-frequency current-mode control architecture with slope compensation, where the ITH pin voltage sets the peak current threshold for the main GATE driver. Its error amplifier compares FBP–FBN to regulate either output voltage (VFBP ≤ 1.23V) or load current (VFBP > 2.5V), with ILIM scaling the current-sense offset from 10mV to 100mV.
True-color PWM dimming is achieved by freezing ITH state during PWMIN low periods-disabling GATE switching while preserving stored current reference-enabling sub-cycle load reactivation without transient over/undervoltage. The IC integrates a 7V LDO (INTVCC), 100kΩ SYNC pull-down, and internal 100mV hysteresis on RUN pin (1.248V nominal threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports wide-input industrial, automotive (42V system compatible), and telecom supplies. |
| Reference Voltage | 1.23V ±1% - enables precise output voltage or current setpoint accuracy in feedback loops. |
| Dimming Ratio | 3000:1 PWM + 100:1 analog - achieves full-range LED brightness control without color shift. |
| Switching Frequency | 20kHz to 1MHz (programmable via FREQ pin resistor) - balances efficiency vs. size for boost/SEPIC/flyback topologies. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial embedded environments. |
| Shutdown Current | 20µA typical - minimizes battery drain in always-on systems during standby. |
| Current Sense Threshold | 125mV to 180mV - defines maximum sensed voltage across sense resistor or MOSFET RDS(on). |
| GATE Driver Peak Current | 0.5A source / 1A sink - drives high-QG N-channel MOSFETs at high frequency with fast rise/fall times. |
Pinout & Package
Package: 16-lead plastic TSSOP (FE package), exposed pad (Pin 17) soldered to PCB ground for thermal and electrical performance. θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (16) | Enable/Shutdown Control Input | 1.248V rising threshold with 100mV hysteresis - provides accurate VIN-based startup sequencing and low-IQ shutdown (20µA). |
| ITH (15) | Error Amplifier Output / Compensation Node | 0–1.4V control voltage setting peak current limit - stores load current reference during PWMIN low for instant restart. |
| OV/FB (14) | Overvoltage Protection / Voltage Feedback Input | 1.32V OV threshold (VREF + 7%) or 1.23V regulation point - disables GATE during overvoltage or regulates output voltage. |
| SS (13) | Soft-Start Timing Input | 50µA pull-up current charges external capacitor - linearly ramps ITH to prevent inrush current at startup. |
| SENSE (12) | Main Current Sense Input | Accepts VDS of power MOSFET (≤36V) or shunt resistor - enables No RSENSE mode for higher efficiency. |
| VIN (11) | Main Power Supply Input | 3–36V input rail - powers internal circuitry and supplies gate charge current to external MOSFETs. |
| INTVCC (10) | Internal 7V LDO Output | 7V ±0.5V regulated supply - powers GATE/PWMOUT drivers and logic; requires ≥4.7µF local ceramic bypass. |
| GATE (9) | Main Power Switch Driver Output | 0.5A source / 1A sink - directly drives N-channel boost/flyback/SEPIC power MOSFET gate. |
| PWMOUT (8) | Load PWM Switch Driver Output | 0.25A source / 0.5A sink - controls external N-channel load switch for true-color LED dimming. |
| PWMIN (7) | PWM Dimming Command Input | 1.6V rising / 0.8V falling threshold - initiates ITH freeze and GATE disable when low, enabling zero-transient dimming. |
| SYNC (6) | External Clock Synchronization Input | 100kΩ internal pull-down - accepts external clock up to 1.3× fOSC for EMI reduction and multi-phase coordination. |
| FREQ (5) | Frequency Programming Input | 0.615V bias voltage - sets oscillator frequency from 20kHz–1MHz using single resistor to GND. |
| VREF (4) | Buffered 1.23V Reference Output | 1.23V ±1% - used to bias FBP or divider networks; must not be bypassed with capacitor (10kΩ to GND recommended). |
| ILIM (3) | Analog Dimming / Current Limit Control | 0.1–1.23V input - scales current-sense offset from 10mV to 100mV for analog dimming or CC/CV boundary setting. |
| FBP (2) | Error Amp Non-Inverting Input / Mode Select | 0–1.23V (voltage mode) or 2.5–36V (CC/CV mode) - determines regulation type and sets target for FBN. |
| FBN (1) | Error Amp Inverting Input / Current Sense Return | Feedback node for output voltage divider or load current sense resistor - referenced to FBP for loop control. |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM Dimming | 3000:1 digital dimming ratio with no color shift - achieved by freezing ITH state during PWMIN low, eliminating transient overshoot/undershoot. |
| No RSENSE Operation | Eliminates external current-sense resistor by using MOSFET RDS(on) - improves efficiency and reduces BOM count for VDS ≤ 36V applications. |
| Dual Gate Drivers | Independent GATE (main converter) and PWMOUT (load switch) outputs - enables simultaneous control of power stage and LED load with timing isolation. |
| Constant Current/Constant Voltage Regulation | Auto-selects regulation mode based on FBP voltage - supports LED current regulation or output voltage regulation, with priority to whichever limit is reached first. |
| Programmable Soft-Start | 50µA SS pin current charges external capacitor - provides controlled ramp of current limit to prevent inrush and ensure stable startup. |
| Wide Input Range & Temp Grade | 3V–36V input with –40°C to +125°C operation - suitable for 42V automotive, 24V industrial, and telecom power systems. |
Applications
| High-Voltage LED Arrays | Telecom Power Supplies |
|---|---|
|
Use Scenario: Driving series-connected white LEDs requiring >25V output in outdoor signage or architectural lighting. IC Role / Device Role / Timing Role: Boost controller with PWMOUT-driven external MOSFET for true-color dimming and GATE-driven power switch for high-efficiency conversion. Use Value: 3000:1 dimming range preserves LED chromaticity across full brightness range while maintaining tight current regulation (±1% ref). |
Use Scenario: Generating isolated 48V or 54V intermediate bus from –48V telecom input in distributed power architectures. IC Role / Device Role / Timing Role: Flyback controller regulating output voltage with OV/FB protection and synchronized switching to reduce conducted EMI. Use Value: Programmable 20kHz–1MHz frequency allows optimization for transformer size and efficiency; SYNC pin enables multi-rail coherence. |
| 42V Automotive Systems | 24V Industrial Controls |
|
Use Scenario: Powering infotainment displays or ADAS sensors from 12V/42V dual-battery systems with cold-crank tolerance. IC Role / Device Role / Timing Role: SEPIC controller supporting buck-boost operation across wide VIN range (3V–36V), with RUN pin enabling precise undervoltage lockout. Use Value: –40°C to +125°C rating ensures reliability in engine bay; 20µA shutdown current extends battery life during vehicle sleep mode. |
Use Scenario: Providing regulated 24V-to-12V/5V auxiliary rails for PLC I/O modules or motor drives in factory automation. IC Role / Device Role / Timing Role: Constant-current/constant-voltage regulator managing both output voltage and input current limits in overload conditions. Use Value: ILIM-adjustable current limit (10mV–100mV) enables precise foldback protection; INTVCC LDO simplifies biasing of external gate drivers. |
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#PBF | Same functionality and pinout, but rated for –40°C to +85°C only. | Suitable for commercial/industrial indoor applications without extended temperature requirements. | Select LTC3783EFE#PBF when ambient operating temperature remains below 85°C and cost sensitivity favors lower-grade qualification. |
| LTC3783IFE#TRPBF | Identical electrical specs and temperature rating; differs only in tape-and-reel packaging (3,000 pcs/reel vs. tube). | Designed for automated SMT assembly lines requiring reel-fed placement. | Choose LTC3783IFE#TRPBF for high-volume production with pick-and-place equipment; same performance as LTC3783IFE#PBF. |
Compared with LTC3783EFE#PBF, the LTC3783IFE#PBF offers guaranteed operation up to +125°C junction temperature-critical for under-hood automotive use-while LTC3783IFE#TRPBF provides identical performance in optimized packaging for volume manufacturing, avoiding any design or layout changes.
Availability
LTC3783IFE#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 temperature performance.
Supply support for LTC3783IFE#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 its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification standards.
The LTC3783IFE#PBF belongs to Linear's precision LED driver and multi-topology controller product line, designed specifically for high-dimming-ratio, high-reliability lighting and DC/DC conversion in harsh environments.
FAQ
What is the maximum input voltage supported by the LTC3783IFE#PBF?
The LTC3783IFE#PBF supports an input voltage range of 3V to 36V. Absolute maximum rating for VIN, SENSE, FBP, and FBN pins is 42V, making it compatible with 42V automotive systems when properly derated per design guidelines. Exceeding 36V continuous operation requires validation of internal regulator and gate driver margins.
How does the LTC3783IFE#PBF achieve 3000:1 PWM dimming without color shift?
The LTC3783IFE#PBF achieves 3000:1 true-color PWM dimming by freezing the ITH voltage (error amplifier output) when PWMIN goes low-storing the exact load current reference-and disabling GATE switching. This prevents output capacitor discharge transients and eliminates overshoot/undershoot during reactivation, preserving LED forward voltage and chromaticity.
Can the LTC3783IFE#PBF operate without an external current-sense resistor?
Yes, the LTC3783IFE#PBF supports No RSENSE mode by sensing the voltage drop across the main power MOSFET's RDS(on), provided VDS ≤ 36V. This eliminates the sense resistor, improving efficiency and reducing component count-ideal for medium-power boost and flyback LED drivers.
What is the purpose of the ILIM pin on the LTC3783IFE#PBF?
The ILIM pin on the LTC3783IFE#PBF sets the current-sense offset voltage (VFBP – VFBN) in constant-current mode. With VILIM = 1.23V, the offset is 100mV; scaling VILIM down proportionally reduces the offset to as low as 10mV, enabling fine-grained analog dimming and adjustable current limits.
Does the LTC3783IFE#PBF support synchronization to an external clock?
Yes, the LTC3783IFE#PBF supports external clock synchronization via the SYNC pin, which accepts signals up to 1.3× the nominal oscillator frequency. An internal 100kΩ pull-down ensures safe default operation when SYNC is unconnected, and synchronization improves EMI performance and enables multi-phase coordination.
LTC3783IFE#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
LTC3783IFE#PBF FAQ
1.How can I place an order for LTC3783IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3783IFE#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 LTC3783IFE#PBF reliable?
The price and inventory of LTC3783IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3783IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3783IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3783IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3783IFE#PBF?
LTC3783IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3783IFE#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 LTC3783IFE#PBF?
For technical support, including LTC3783IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3783IFE#PBF requirements.
6.How does Aetrix verify that LTC3783IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3783IFE#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 LTC3783IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3783IFE#PBF?
All LTC3783IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3783IFE#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 LTC3783IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3783IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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