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Analog Devices Inc. LT3517EFE#TRPBF
- Part No.:
- LT3517EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3517EFE#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,884
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Product details
Overview
LT3517EFE#TRPBF from Analog Devices is a constant-current/constant-voltage DC/DC LED driver IC with an internal 1.5A, 45V power switch, programmable 250kHz–2.5MHz switching frequency, 100mV high-side current sense threshold, and 5000:1 true-color PWM dimming capability. It operates in boost, buck, and buck-boost topologies and is used in automotive lighting systems requiring robust transient protection up to 40V.
For engineers reviewing the LT3517EFE#TRPBF datasheet, LT3517EFE#TRPBF pinout, LT3517EFE#TRPBF application, or LT3517EFE#TRPBF equivalent, key selection criteria include its 16-pin TSSOP package, –40°C to 125°C operating junction temperature, open-LED protection, and dual dimming control via PWM and CTRL pins.
Technical Context
The LT3517EFE#TRPBF implements a current-mode control architecture combining a voltage feedback loop (FB pin, 1.01V threshold) and a current feedback loop (ISP/ISN differential sensing) to seamlessly transition between constant-current and constant-voltage regulation modes. Its internal 1.5A switch supports peak currents up to 2.3A and features integrated gate drive for external PMOS disconnect (TG pin, 7V clamp).
Switching frequency is set either by an external RT resistor (250kHz–2.5MHz range) or synchronized to an external clock via SYNC pin, with built-in soft-start (SS pin), shutdown control (SHDN pin), and thermal protection. The CTRL pin enables analog dimming (10:1 ratio) by scaling the 100mV current-sense threshold down to 9mV at 0.1V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 1.5A typical; supports LED strings up to 1A continuous output with margin for transients. |
| Input Voltage Range | 3V to 30V continuous; withstands 40V nonrepetitive transients-suitable for 12V/24V automotive rails. |
| Current Sense Threshold | 100mV nominal across ISP–ISN; enables precise, low-loss current regulation with standard 100mΩ sense resistors. |
| Dimming Ratio | 5000:1 via PWM pin; achieves flicker-free, high-fidelity color rendering in display backlighting. |
| Operating Temperature | –40°C to 125°C junction; validated for under-hood automotive and industrial ambient environments. |
| Package | 16-lead plastic TSSOP; surface-mount compatible with standard reflow profiles and IPC-compliant layout rules. |
| Shutdown Current | <1µA; enables ultra-low-power standby in battery-powered illumination systems. |
Pinout & Package
LT3517EFE#TRPBF is housed in a 16-lead plastic TSSOP package (JEDEC MO-153, 4.4mm × 5mm body, 0.65mm pitch) with exposed thermal pad connected internally to GND. Pin 1 is located at bottom-left corner when marking side faces up and notch is oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 3V–30V DC; requires local 2.2µF ceramic bypass capacitor for stable operation. |
| SHDN | Enable/disable control | Logic-high (>1.2V) enables IC; logic-low (<0.45V) disables switch and reduces quiescent current to <1µA. |
| VREF | 2.0V precision reference output | Supplies up to 100µA; used to bias CTRL pin for full-scale 100mV current sense or external circuitry. |
| RT | Frequency programming node | Resistor-to-GND sets oscillator frequency from 250kHz to 2.5MHz; determines size/efficiency trade-off of external magnetics. |
| SYNC | External clock synchronization input | Accepts TTL/CMOS clock; forces switching edge alignment for EMI reduction and multi-phase systems. |
| SS | Soft-start timing node | Capacitor-to-GND controls ramp rate of VC voltage; prevents inrush current and output overshoot at startup. |
| PWM | Digital dimming control | Active-low signal disables main switch and holds VC charge state; enables 5000:1 true-color PWM dimming. |
| CTRL | Analog current adjustment | 0–1V input scales current sense threshold linearly from 0 to 100mV; provides 10:1 analog dimming complementing PWM. |
| SW | Power switch drain node | Connects to inductor/diode in boost/buck configurations; high di/dt node requiring minimized trace area for EMI control. |
| TG | Top-gate PMOS driver output | Drives external PMOS between VISP and (VISP – 7V); includes internal 7V clamp to protect gate oxide. |
| ISP / ISN | High-side current sense inputs | Differential pair measures voltage across external sense resistor; rail-to-rail operation supports wide LED string voltages. |
| FB | Voltage feedback input | Regulates output to 1.01V threshold; functions as overvoltage protection-switch turns off if FB exceeds 1.04V. |
| VC | Error amplifier output | gm-type output (550µS transconductance); connects to RC compensation network for loop stability in LED current/voltage control. |
| TGEN | PMOS driver enable | Logic-high (>1.5V) activates TG output; internal 40kΩ pull-down allows direct grounding to disable PMOS function. |
| GND | Signal and power ground | Single ground reference for all analog/digital functions; exposed pad must be soldered to PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-topology operation | Native support for boost, buck, and buck-boost configurations-enables single IC solution across diverse LED voltage/current requirements. |
| Open-LED protection | Automatic shutdown when ISP–ISN differential falls below 9mV-prevents overvoltage damage during LED string failure. |
| Transient input tolerance | Withstands 40V/1s transients on VIN/SHDN/PWM/TGEN-meets ISO 7637-2 pulse 5a requirements for automotive applications. |
| Integrated PMOS gate driver | TG pin drives external PMOS with 7V clamped output-enables fast LED string disconnect during PWM off-time to preserve output capacitance charge. |
| Low-noise current sensing | 100mV sense threshold with 0.03%/V line regulation-minimizes error across input voltage variations without calibration. |
| Thermal protection | Internal overtemperature shutdown at TJ > 150°C-protects device during overload or poor heatsinking while maintaining safe operating area. |
Applications
| Automotive Headlamp Control | Industrial Display Backlighting |
|---|---|
Use Scenario: High-brightness LED headlamps in passenger vehicles requiring adaptive beam shaping and dynamic dimming. IC Role / Device Role / Timing Role: Constant-current LED driver regulating 1A output in buck-boost mode across 8V–16V battery range with load-dump immunity. Use Value: 5000:1 PWM dimming preserves color fidelity during low-light modulation; open-LED protection avoids catastrophic failure during filament-style LED burnout. | Use Scenario: TFT-LCD backlight for factory HMIs and medical displays needing uniform luminance and flicker-free operation. IC Role / Device Role / Timing Role: Boost-mode LED driver powering 10-series white LEDs from 5V rail with 1.01V FB regulation and 2.5MHz switching. Use Value: 2.5MHz operation enables <10mm² solution size; CTRL+PWM dual dimming supports both system-level brightness control and local panel tuning. |
| Avionic Cabin Lighting | Barcode Scanner Illumination |
Use Scenario: Redundant LED lighting modules in aircraft cabins requiring DO-160D Section 22 lightning surge compliance and extended temperature operation. IC Role / Device Role / Timing Role: Buck-mode driver delivering 300mA to parallel LED strings with SHDN-controlled sequencing and TSSOP package for high-reliability assembly. Use Value: –40°C to 125°C rating ensures functionality at cruise altitudes; <1µA shutdown current extends battery backup runtime during ground maintenance. | Use Scenario: High-speed linear CCD scanners requiring pulsed LED illumination synchronized to image capture timing. IC Role / Device Role / Timing Role: Synchronized boost driver using SYNC pin to align switching edges with scanner trigger signal for sub-microsecond timing jitter. Use Value: External clock sync eliminates beat frequencies between LED drive and sensor sampling; 200ns gate delays ensure precise LED on/off timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3518EFE#TRPBF | Same pinout, identical topology support, but rated for 2.5A switch current and 60V max switch voltage. | Required for higher-power LED arrays (>1.5A) or 48V industrial bus inputs where LT3517EFE#TRPBF's 45V switch rating is insufficient. | Select LT3518EFE#TRPBF when output current exceeds 1.2A or input transients exceed 40V. |
| LM3409QMH/NOPB | Adjustable 1.25V current sense threshold, no integrated VREF, no TG driver, and only boost/buck-boost support (no buck mode). | Suitable for cost-sensitive automotive tail-light designs where buck operation is unnecessary and external reference is acceptable. | Choose LM3409QMH/NOPB for simplified boost-only designs with lower BOM count and AEC-Q100 qualification. |
Compared with LT3517EFE#TRPBF, LT3518EFE#TRPBF offers higher current and voltage headroom at identical footprint, while LM3409QMH/NOPB trades topology flexibility and integrated features for AEC-Q100 compliance and lower unit cost in dedicated boost applications.
Availability
LT3517EFE#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, industrial display backlighting, and avionic cabin illumination requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3517EFE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors with deep expertise in precision power conversion.
The LT3517 product line was designed specifically for high-reliability LED lighting applications demanding multi-topology flexibility, wide input range, and robust protection-targeting automotive, aerospace, and industrial markets.
FAQ
What is the maximum continuous input voltage rating for the LT3517EFE#TRPBF?
The LT3517EFE#TRPBF has a maximum continuous input voltage rating of 30V on the VIN pin. It can withstand nonrepetitive 40V transients for up to one second, making it suitable for 24V automotive systems with load-dump events. This rating is specified in the Absolute Maximum Ratings table and verified across the –40°C to 125°C operating junction temperature range for the LT3517E grade.
Does the LT3517EFE#TRPBF support buck-mode LED driving, and what are the key layout considerations?
Yes, the LT3517EFE#TRPBF supports buck-mode LED driving as confirmed in the device description, block diagram, and Typical Application circuits (e.g., Figure 1 and TA02a). Key layout considerations include minimizing SW node area to reduce EMI, placing the input bypass capacitor (≥2.2µF ceramic) directly at the VIN pin, and routing ISP/ISN traces as matched, low-resistance pairs to avoid current-sense offset errors in the LT3517EFE#TRPBF.
How does the CTRL pin dimming interact with the PWM pin dimming in the LT3517EFE#TRPBF?
In the LT3517EFE#TRPBF, the CTRL pin provides 10:1 analog dimming by scaling the 100mV current-sense threshold linearly (e.g., 0.5V at CTRL yields 50mV threshold → 50% LED current), while the PWM pin delivers 5000:1 digital dimming by enabling/disabling the main switch. They operate orthogonally: PWM sets the outer duty cycle envelope, and CTRL adjusts the current level within each active PWM period-enabling combined dimming ratios up to 50,000:1 in the LT3517EFE#TRPBF.
What is the purpose of the TG and TGEN pins on the LT3517EFE#TRPBF, and how are they used?
The TG pin is a top-gate driver output that sources/sinks current to drive an external PMOS transistor between VISP and (VISP – 7V), enabling LED string disconnect during PWM off-time. The TGEN pin enables this function: applying >1.5V activates TG, while grounding TGEN disables it. This combination preserves output capacitor charge and improves dimming transient response in the LT3517EFE#TRPBF.
Is the LT3517EFE#TRPBF RoHS-compliant and lead-free, and what is its packaging format?
Yes, the LT3517EFE#TRPBF is RoHS-compliant and lead-free, as indicated by the "#TRPBF" suffix per Linear Technology's marking conventions. It is supplied in tape-and-reel format (1,000 units per reel) in a 16-lead plastic TSSOP package with JEDEC-standard dimensions and Pb-free matte tin lead finish, fully compatible with standard SMT reflow processes.
LT3517EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- True Color PWM™
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 30V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.5A (Switch)
- Frequency:
- 250kHz ~ 2.5MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3517EFE#TRPBF FAQ
1.How can I place an order for LT3517EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3517EFE#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 LT3517EFE#TRPBF reliable?
The price and inventory of LT3517EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3517EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3517EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3517EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3517EFE#TRPBF?
LT3517EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3517EFE#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 LT3517EFE#TRPBF?
For technical support, including LT3517EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3517EFE#TRPBF requirements.
6.How does Aetrix verify that LT3517EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3517EFE#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 LT3517EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3517EFE#TRPBF?
All LT3517EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3517EFE#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 LT3517EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3517EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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