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Analog Devices Inc. LTC3783EDHD#PBF
- Part No.:
- LTC3783EDHD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3783EDHD#PBF.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
LTC3783EDHD#PBF 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 (100:1), operates from 3V–36V input, and provides constant-current or constant-voltage regulation with programmable frequency (20kHz–1MHz) in a 16-lead DFN (5mm × 4mm) package. It is used in high-brightness LED backlighting for telecom and industrial displays.
For engineers reviewing the LTC3783EDHD#PBF datasheet, LTC3783EDHD#PBF pinout, LTC3783EDHD#PBF application, or LTC3783EDHD#PBF equivalent, key selection considerations include its dual-switch control architecture, No RSENSE capability for VDS ≤ 36V, 1.23V reference accuracy (±1%), 100mV RUN hysteresis, and 20µA shutdown current - all critical for stable, high-dynamic-range LED current regulation in space-constrained designs.
Technical Context
The LTC3783EDHD#PBF implements a fixed-frequency current-mode control loop with slope compensation, where ITH voltage sets the peak current threshold for GATE switching. 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. The internal 7V LDO powers gate drivers and logic, supporting up to 50mA INTVCC output.
PWMIN controls synchronous load switching: when low, it disables GATE, pulls PWMOUT low, and disconnects the ITH network to preserve stored current state - enabling transient-free 3000:1 digital dimming. The SYNC pin allows external clock synchronization up to 1.3× fOSC, while FREQ pin sets oscillator frequency via a single resistor (20kHz–1MHz range).
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 Accuracy | 1.23V ±1% - enables precise output voltage or current setpoint definition with minimal calibration overhead. |
| Shutdown Current | 20µA typical - ensures ultra-low system standby power in battery-backed or energy-sensitive applications. |
| Operating Frequency Range | 20kHz to 1MHz - selectable via single FREQ-to-GND resistor; balances efficiency (low f) vs. size (high f). |
| RUN Pin Hysteresis | 100mV - provides noise-immune enable/disable threshold control for reliable power sequencing. |
| Max Duty Cycle | 97% - supports high step-up ratios in boost and SEPIC topologies with minimal dropout margin. |
| Current Sense Threshold | 125mV to 180mV - defines overcurrent trip point; usable with discrete sense resistors or MOSFET RDS(on) in No RSENSE mode. |
Pinout & Package
Package: 16-lead DFN (5mm × 4mm), exposed pad (Pin 17) soldered to PCB ground for thermal and electrical performance (θJA = 43°C/W). Operating temperature range: –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN (16) | Enable/Shutdown Control Input | 1.248V rising threshold with 100mV hysteresis; grounds internal bias to reduce IQ to 20µA in shutdown. |
| ITH (15) | Error Amplifier Output / Compensation Node | Controls peak current limit; voltage ramp (0–1.4V) sets ITRIP threshold; connects to external RC for loop stability. |
| OV/FB (14) | Overvoltage Protection / Voltage Feedback Input | In voltage mode: trips at 1.32V (VREF + 7%) to disable GATE; in CC/CV mode: regulates VOUT to 1.23V. |
| SS (13) | Soft-Start Timing Input | 50µA pull-up current charges external capacitor; limits inrush by ramping ITH from 0V to 1.23V at startup. |
| SENSE (12) | Main Current Sense Input | Accepts VDS of power MOSFET (≤36V) or source-shunt resistor; includes leading-edge blanking for noise immunity. |
| VIN (11) | Main Power Supply Input | 3V–36V input; requires local ceramic decoupling; powers internal circuitry before INTVCC regulator starts. |
| INTVCC (10) | Internal 7V LDO Output | Supplies gate drivers and logic; must be bypassed with ≥4.7µF low-ESR ceramic capacitor to GND. |
| GATE (9) | Main Power Switch Driver Output | Drives N-channel MOSFET gate; 0.5A source / 1A sink peak current; rise/fall times <15ns/8ns (CL = 3300pF). |
| PWMOUT (8) | Load PWM Switch Driver Output | Drives external N-channel load switch; 0.25A source / 0.5A sink; synchronized with PWMIN for zero-transient dimming. |
| PWMIN (7) | External PWM Dimming Input | 1.6V rising threshold; internal 100kΩ pull-up; when low, stores ITH state and holds PWMOUT/GATE inactive. |
| SYNC (6) | External Clock Synchronization Input | Accepts 2V–7V clock pulses ≥25ns wide; locks internal oscillator up to 1.3× nominal fOSC. |
| FREQ (5) | Oscillator Frequency Programming Input | 0.615V nominal voltage; RT resistor to GND sets fOSC from 20kHz to 1MHz per manufacturer graph. |
| VREF (4) | Buffered 1.23V Reference Output | Provides stable reference for feedback divider; not to be bypassed with capacitor; use 10kΩ to GND in noisy environments. |
| ILIM (3) | Analog Dimming / Current Limit Control | Sets current-sense offset (VFBP–VFBN) from 10mV to 100mV; enables 10:1 analog dimming ratio. |
| FBP (2) | Error Amp Noninverting Input / Mode Select | Determines regulation mode: ≤1.23V = voltage mode; >2.5V = constant-current/constant-voltage mode. |
| FBN (1) | Error Amp Inverting Input / Current Sense Return | Connects to load-side of sense resistor (CC mode) or output divider (CV mode); nominal regulation voltage = VFBP. |
| Exposed Pad (17) | Thermal & Electrical Ground | Mandatory solder connection to PCB ground plane; essential for thermal dissipation and noise reduction. |
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 phase and resuming regulation instantly on high edge. |
| No RSENSE Operation | Eliminates external current-sense resistor by using MOSFET RDS(on) for sensing when VDS ≤ 36V - improves efficiency and reduces BOM count. |
| Integrated Dual Gate Drivers | Separate high-current GATE (0.5A/1A) and PWMOUT (0.25A/0.5A) drivers - enables independent control of power stage and LED load switch. |
| Programmable CC/CV Regulation | Selects between constant-current (LED drive) or constant-voltage (power supply) operation via FBP voltage level - simplifies multi-function design reuse. |
| Robust Protection Suite | Includes overvoltage lockout (7% OV threshold), thermal shutdown (165°C), and RUN pin hysteresis - ensures safe operation under fault conditions. |
Applications
| Telecom Power Supplies | High-Voltage LED Arrays |
|---|---|
|
Use Scenario: 48V telecom line-powered LED status indicators and optical module bias supplies requiring stable current over wide temperature ranges. IC Role / Device Role / Timing Role: Boost controller regulating constant current into parallel LED strings up to 25V, with analog dimming via ILIM and PWM dimming via PWMIN. Use Value: 3000:1 dimming preserves LED chromaticity across full brightness range; No RSENSE mode eliminates sense resistor losses in compact modules. |
Use Scenario: Backlighting for industrial HMIs and outdoor signage using high-VF white LED arrays (e.g., LUMILEDS LHXL-BW02) powered from 12V–16V rails. IC Role / Device Role / Timing Role: PWM LED boost controller driving Si4470EY MOSFETs; uses FBP/FBN for current regulation and OV/FB for overvoltage protection. Use Value: 1.23V reference accuracy (±1%) ensures consistent LED luminance across production units; 100mV RUN hysteresis prevents brownout oscillation. |
| 42V Automotive Systems | 24V Industrial Controls |
|
Use Scenario: LED lighting in commercial vehicles with 24V nominal battery (up to 42V transients), requiring robust start-stop and cold-crank operation. IC Role / Device Role / Timing Role: Flyback or SEPIC controller delivering regulated current to LED loads; uses RUN pin for undervoltage lockout at 1.248V with hysteresis. Use Value: 36V absolute max SENSE pin rating supports direct VDS sensing on high-side MOSFETs; 20µA shutdown current extends battery life during sleep mode. |
Use Scenario: Programmable LED illumination in PLC I/O modules and factory automation panels powered from 24V DC rails. IC Role / Device Role / Timing Role: Constant-current boost driver with SYNC input synchronized to system clock for EMI reduction; FREQ resistor sets 500kHz switching. Use Value: External clock synchronization minimizes conducted emissions in noise-sensitive industrial environments; DFN package enables dense PCB layout. |
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 silicon, rated for –40°C to +125°C junction temperature (vs. –40°C to +85°C for LTC3783EDHD#PBF); identical pinout and electrical specs. | Required for under-hood automotive or high-ambient industrial deployments where extended temperature operation is mandatory. | Select LTC3783IDHD#PBF when operating ambient exceeds 85°C or when AEC-Q200 qualification is needed (note: LTC3783EDHD#PBF is not AEC-Q200 qualified). |
| LTC3783EFE#PBF | Same functionality and specs, but in 16-lead TSSOP package (θJA = 38°C/W vs. 43°C/W for DFN); different pinout orientation and larger footprint. | Preferred where hand-soldering, visual inspection, or thermal relief via leads is prioritized over board area or thermal performance. | Choose LTC3783EFE#PBF only if DFN assembly infrastructure is unavailable or if thermal derating margins allow higher θJA. |
Compared with LTC3783EDHD#PBF, the LTC3783IDHD#PBF offers extended temperature capability without electrical trade-offs, while the LTC3783EFE#PBF trades thermal efficiency and compactness for manufacturability - making the DFN variant optimal for space-constrained, thermally demanding LED driver designs.
Availability
LTC3783EDHD#PBF is available at Aetrix Electronics and suitable for telecom power supplies, high-voltage LED arrays, 42V automotive systems, and 24V industrial controls requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3783EDHD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial, automotive, and communications markets.
The LTC3783 product line was designed specifically for high-dynamic-range LED current regulation and flexible DC/DC conversion in boost, flyback, and SEPIC topologies - targeting applications demanding true-color PWM dimming, analog dimming flexibility, and robust protection.
FAQ
What is the maximum input voltage supported by the LTC3783EDHD#PBF?
The LTC3783EDHD#PBF supports an input voltage range of 3V to 36V. Its absolute maximum rating for VIN, SENSE, FBP, and FBN pins is 42V, but continuous operation above 36V violates the specified operating range and may compromise reliability or regulation accuracy. For applications requiring >36V input, external clamping or pre-regulation is required before the LTC3783EDHD#PBF input stage.
How does the No RSENSE mode work in the LTC3783EDHD#PBF?
The LTC3783EDHD#PBF implements No RSENSE mode by using the power MOSFET's intrinsic RDS(on) as the current-sense element. When the SENSE pin is connected to the MOSFET drain, the IC measures VDS directly - eliminating the need for an external shunt resistor. This mode is valid only when VDS ≤ 36V and improves efficiency by removing I²R losses associated with discrete sense resistors.
Can the LTC3783EDHD#PBF be synchronized to an external clock, and what are the limits?
Yes, the LTC3783EDHD#PBF can be synchronized to an external clock applied to the SYNC pin. The recommended maximum synchronization ratio is 1.3× the nominal oscillator frequency (fOSC). For example, if fOSC is set to 300kHz via the FREQ resistor, the external clock must not exceed 390kHz. Exceeding this limit risks inadequate slope compensation and potential subharmonic oscillation.
What is the purpose of the ILIM pin on the LTC3783EDHD#PBF?
The ILIM pin on the LTC3783EDHD#PBF sets the current-sense offset voltage (VFBP – VFBN) in constant-current mode. With VILIM = 1.23V, the offset is 100mV; lower ILIM voltages proportionally reduce the offset down to 10mV. This enables 10:1 analog dimming control and fine-tuning of LED current regulation thresholds without changing external components.
Does the LTC3783EDHD#PBF support both constant-current and constant-voltage regulation?
Yes, the LTC3783EDHD#PBF supports both modes. When VFBP ≤ 1.23V, it operates in constant-voltage mode using OV/FB for output voltage feedback. When VFBP > 2.5V, it enters constant-current/constant-voltage mode: FBP and FBN sense voltage across a load-series resistor, and the loop regulates whichever parameter (current or voltage) hits its preset limit first - ideal for LED drivers with overvoltage protection.
LTC3783EDHD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN 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-DFN (5x4)
LTC3783EDHD#PBF FAQ
1.How can I place an order for LTC3783EDHD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3783EDHD#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 LTC3783EDHD#PBF reliable?
The price and inventory of LTC3783EDHD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3783EDHD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3783EDHD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3783EDHD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3783EDHD#PBF?
LTC3783EDHD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3783EDHD#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 LTC3783EDHD#PBF?
For technical support, including LTC3783EDHD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3783EDHD#PBF requirements.
6.How does Aetrix verify that LTC3783EDHD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3783EDHD#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 LTC3783EDHD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3783EDHD#PBF?
All LTC3783EDHD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3783EDHD#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 LTC3783EDHD#PBF part is unused and in its original packaging.
Return procedure for LTC3783EDHD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3783EDHD#PBF Tags
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