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Analog Devices Inc. LT3517HFE#TRPBF
- Part No.:
- LT3517HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3517HFE#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,288
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Product details
Overview
LT3517HFE#TRPBF from Analog Devices is a constant-current/constant-voltage LED driver IC with an integrated 1.5A, 45V DMOS 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 for display backlighting and automotive lighting systems.
For engineers reviewing the LT3517HFE#TRPBF datasheet, LT3517HFE#TRPBF pinout, LT3517HFE#TRPBF application, or LT3517HFE#TRPBF equivalent, key selection criteria include its –40°C to 150°C operating junction temperature, TSSOP-16 package, open-LED protection, and dual dimming (PWM + CTRL analog) support for high-fidelity illumination control.
Technical Context
The LT3517HFE#TRPBF implements a current-mode DC/DC controller with dual feedback loops: a voltage loop (FB pin, 1.01V threshold) and a current loop (ISP/ISN differential sense, 100mV full-scale). Its internal 1.5A/45V switch supports continuous conduction mode across all three topologies, with rail-to-rail current sense amplifier operation enabling accurate regulation down to 9mV sense voltage (10% scale).
Switching frequency is set via RT resistor (250kHz–2.5MHz) or synchronized externally via SYNC pin with 20% slower RT programming. The TG output drives an external PMOS for LED disconnect during PWM low, while TGEN enables/disables that function. Thermal shutdown activates at TJ = 150°C (guaranteed over full range).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Junction Temp | –40°C to 150°C - enables use in under-hood automotive lighting without derating. |
| Switch Rating | 1.5A, 45V - supports up to 30V continuous input and 40V transient survival. |
| Current Sense Threshold | 100mV (typ), ±3% over temp - minimizes power loss in sense resistor and improves accuracy. |
| PWM Dimming Ratio | 5000:1 - achieves flicker-free, high-fidelity color rendering in display backlights. |
| Dimming Control | CTRL pin adds 10:1 analog dimming - extends total dimming range beyond PWM alone. |
| Package | 16-pin TSSOP - surface-mount compatible with standard PCB assembly processes. |
| Protection Features | Open-LED detection, thermal shutdown, and 1µA shutdown current - ensures system safety and low standby power. |
Pinout & Package
LT3517HFE#TRPBF is housed in a 16-lead plastic TSSOP package (JEDEC MO-153, 4.4mm × 5.0mm × 1.2mm), with exposed pad not present (unlike QFN variants). Pin 1 is located at bottom-left corner when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 3V–30V continuous, 40V transient; requires local 2.2µF ceramic bypass. |
| SHDN | Enable/disable control | Logic-high (>1.2V) enables; logic-low (<0.4V) disables with <1µA quiescent current. |
| CTRL | Analog current setpoint | Sets LED current from 0–100% of full scale (100mV sense); 0–1V input range. |
| PWM | Digital dimming input | Active-low signal; disables switching and saves VC state for fast recovery (5000:1 ratio). |
| SYNC | External clock input | Accepts 0.4–1.5V logic-low/high; synchronizes switching edge with external source. |
| FB | Voltage loop feedback | Regulates output to 1.01V threshold; provides overvoltage protection for LED string. |
| SS | Soft-start timing | Capacitor-connected node; controls ramp-up of output to limit inrush current. |
| RT | Frequency programming | Resistor-to-GND sets oscillator frequency (250kHz–2.5MHz); must not be left floating. |
| SW | Power switch node | Drives external inductor/diode; high di/dt node requiring minimized trace area. |
| PVIN | Power switch supply | Bypassed separately; supplies gate drive for internal DMOS switch. |
| ISP / ISN | High-side current sense | Differential inputs for 100mV sense resistor; rail-to-rail operation enables low-VLED designs. |
| TG | PMOS gate driver | Inverted PWM output; clamped to VISP – 7V for safe PMOS gate biasing. |
| TGEN | TG enable control | Logic-high (>1.5V) enables TG output; internal 40kΩ pull-down if unconnected. |
| VREF | 2.0V reference output | Stable 2.0V ±1% reference; supplies up to 100µA for external circuitry or CTRL bias. |
| VC | Error amplifier output | gm amplifier output (550µS); compensated externally for loop stability. |
| GND | Signal ground | Reference for all analog circuits; connects to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Triple topology support | Operates as boost, buck, or buck-boost LED driver - eliminates need for multiple part numbers across design variants. |
| True Color PWM™ dimming | 5000:1 ratio with minimal color shift - meets high-end display backlight requirements for medical and avionic applications. |
| Integrated PMOS gate driver | TG output with 7V clamp - enables fast LED string disconnect during PWM off-time, preserving output capacitor charge. |
| Wide input voltage range | 3V–30V continuous operation - accommodates 12V automotive, 24V industrial, and multi-cell battery inputs. |
| Robust thermal rating | 150°C guaranteed junction temperature - supports placement in thermally constrained enclosures without forced cooling. |
Applications
| Automotive Headlamp Control | Avionic Display Backlighting |
|---|---|
Use Scenario: Adaptive front-lighting system (AFS) with dynamic beam shaping using multi-segment LED arrays. IC Role / Device Role / Timing Role: Constant-current LED driver regulating individual LED strings in buck-boost configuration with load-dump transient immunity. Use Value: Withstands 40V transients per ISO 7637-2; 150°C rating allows placement near headlamp heat sources; 5000:1 dimming enables smooth glare-free transitions. | Use Scenario: High-reliability cockpit display backlight requiring EMI resilience and zero flicker across wide temperature range. IC Role / Device Role / Timing Role: Boost-mode LED driver powering white LED strings from 28V aircraft bus with synchronized switching to avoid interference with navigation receivers. Use Value: SYNC pin enables clock alignment with avionics master timing; 1.01V FB threshold ensures stable regulation despite bus ripple; TSSOP package supports conformal coating. |
| Industrial Scanner Illumination | Medical Imaging Light Source |
Use Scenario: High-speed barcode scanner requiring precise pulsed LED illumination synchronized to image capture. IC Role / Device Role / Timing Role: Buck-mode LED driver with external PMOS disconnect (TG/TGEN) enabling µs-level on/off control independent of switching frequency. Use Value: CTRL+PWM dual dimming allows fine-grained intensity tuning while maintaining pulse fidelity; 100mV sense minimizes power loss in compact form factor. | Use Scenario: Endoscopic light source demanding stable, flicker-free output with calibrated intensity for diagnostic accuracy. IC Role / Device Role / Timing Role: Constant-current regulator in boost configuration driving high-Vf LED arrays from 5V USB-PD or battery input. Use Value: Open-LED protection prevents fault propagation; 150°C rating supports sealed thermal management; 100mV sense enables precision current control below 1mA resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3783EFE#TRPBF | Higher 3A switch current, 60V rating, but no integrated current sense amp or TG driver; requires external sense resistor and PMOS gate control. | Targeted at higher-power industrial lighting; lacks native 5000:1 PWM dimming and open-LED protection. | Select when >1.5A LED current or >45V input is required; accept added BOM complexity for scalability. |
| MAX16820ATP+ | Fixed 1MHz frequency, 1.2A switch, 40V rating; uses low-side current sensing and lacks TG output or SYNC capability. | Optimized for cost-sensitive consumer backlighting; limited to boost-only topology and 1000:1 dimming. | Select for simpler, lower-cost boost-only designs where thermal margin and dimming fidelity are secondary. |
Compared with LTC3783EFE#TRPBF and MAX16820ATP+, the LT3517HFE#TRPBF delivers superior integration (integrated sense amp, TG driver, dual-loop control), wider dimming range, and guaranteed 150°C operation - making it optimal for thermally demanding, high-fidelity LED systems where board space and reliability are critical.
Availability
LT3517HFE#TRPBF is available at Aetrix Electronics and suitable for automotive headlamps, avionic displays, industrial scanners, and medical imaging devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3517HFE#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 (including former Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3517 product line was designed specifically for high-efficiency, multi-topology LED driving in harsh environments - emphasizing thermal robustness, integrated protection, and precision dimming for safety-critical illumination.
FAQ
What is the maximum continuous input voltage rating for LT3517HFE#TRPBF?
The LT3517HFE#TRPBF supports continuous operation up to 30V on the VIN pin. It withstands nonrepetitive 40V transients for up to one second per Absolute Maximum Ratings. This makes LT3517HFE#TRPBF suitable for 24V industrial and 12V automotive systems with load-dump immunity requirements.
Does LT3517HFE#TRPBF support buck, boost, and buck-boost topologies simultaneously in a single design?
No - the LT3517HFE#TRPBF supports each topology individually based on external component configuration. Its internal architecture allows re-use of the same IC across boost, buck, or buck-boost LED driver designs by changing the inductor, diode, and feedback network. The LT3517HFE#TRPBF does not auto-configure; topology is fixed per schematic implementation.
How is the 5000:1 PWM dimming ratio achieved in LT3517HFE#TRPBF?
The LT3517HFE#TRPBF achieves 5000:1 PWM dimming by combining fast switching (up to 2.5MHz), stored VC node state during PWM low periods, and external PMOS LED disconnect via the TG output. Minimum PWM pulse width is ~2µs (at 2MHz), and maximum period is typically 10ms - yielding 10ms/2µs = 5000:1. This is documented in the Applications Information section of the LT3517HFE#TRPBF datasheet.
What is the purpose of the TGEN pin on LT3517HFE#TRPBF?
On the LT3517HFE#TRPBF, the TGEN pin enables or disables the TG (top gate driver) output. When TGEN is pulled above 1.5V, TG actively drives an external PMOS to disconnect the LED string during PWM low time. When TGEN is grounded or left floating (internal 40kΩ pull-down), TG is disabled. This allows flexible control of LED current path isolation without modifying the main PWM signal.
Can LT3517HFE#TRPBF operate without connecting the RT pin?
No - the RT pin must be connected to a resistor to GND for proper operation. Leaving RT open causes undefined switching frequency and potential instability. The LT3517HFE#TRPBF datasheet explicitly states "Do not leave this pin open" and provides RT resistor values for frequencies from 250kHz to 2.5MHz. No internal pull-up or pull-down exists on RT.
LT3517HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3517HFE#TRPBF FAQ
1.How can I place an order for LT3517HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3517HFE#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 LT3517HFE#TRPBF reliable?
The price and inventory of LT3517HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3517HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3517HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3517HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3517HFE#TRPBF?
LT3517HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3517HFE#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 LT3517HFE#TRPBF?
For technical support, including LT3517HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3517HFE#TRPBF requirements.
6.How does Aetrix verify that LT3517HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3517HFE#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 LT3517HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3517HFE#TRPBF?
All LT3517HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3517HFE#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 LT3517HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3517HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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