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Analog Devices Inc. LT3518EFE#TRPBF
- Part No.:
- LT3518EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3518EFE#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,150
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Product details
Overview
LT3518EFE#TRPBF from Analog Devices is a constant-current/constant-voltage DC/DC LED driver IC with an internal 2.3A, 45V power switch, programmable 250kHz–2.5MHz switching frequency, 100mV high-side current sense threshold, and 3000:1 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 LT3518EFE#TRPBF datasheet, LT3518EFE#TRPBF pinout, LT3518EFE#TRPBF application, or LT3518EFE#TRPBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world dimming performance data, and validated alternative options for LED driver design and supply chain continuity.
Technical Context
The LT3518EFE#TRPBF integrates a current-mode PWM controller with dual-loop regulation-combining a voltage feedback loop (FB pin, 1.01V threshold) and a precision current-sense loop (ISP/ISN, 100mV threshold)-to seamlessly transition between constant-current and constant-voltage modes. Its internal 2.3A/45V DMOS switch supports wide input (3V–30V) and transient-tolerant (40V) operation.
It features synchronous frequency adjustment via RT resistor or external SYNC clock, soft-start control (SS pin), analog dimming via CTRL pin (0–1V, 10:1 range), and gate drive for external PMOS LED disconnect (TG pin, 7V clamp). Open-LED protection and <1µA shutdown current enhance system reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 2.3A typical - supports up to 1.5A continuous LED current in buck mode with margin for transients |
| Input Voltage Range | 3V to 30V continuous - enables direct integration into 12V/24V automotive and industrial rails |
| Current Sense Threshold | 100mV ±3% - enables accurate, low-loss LED current regulation with minimal PCB trace error sensitivity |
| Dimming Ratio | 3000:1 true-color PWM - achieves flicker-free, high-fidelity dimming down to 0.033% duty cycle at 120Hz |
| Switching Frequency | 250kHz to 2.5MHz - allows trade-off between efficiency (lower fSW) and component size (higher fSW) |
| Operating Temp Range | –40°C to +125°C junction - qualified for under-hood automotive and industrial ambient environments |
| Shutdown Current | <1µA - preserves battery life in always-on lighting systems during standby |
Pinout & Package
The LT3518EFE#TRPBF is housed in a 16-lead plastic TSSOP package (FE package), with exposed pad soldered to PCB ground for thermal and electrical integrity. Pin 17 (exposed pad) is GND and must be connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply rail | Accepts 3V–30V DC; requires local 2.2µF ceramic bypass capacitor |
| SHDN | Enable/disable control | Logic-high ≥1.2V enables; ≤0.45V disables with <1µA quiescent draw |
| VREF | 2.0V reference output | Stable 2.0V ±2% source for CTRL bias or external circuitry; supplies up to 100µA |
| RT | Frequency programming | Resistor-to-GND sets fSW from 250kHz–2.5MHz; must not be left floating |
| SYNC | External clock input | Accepts 1.5V–6V logic; synchronizes switching with external clock 20% faster than RT-set frequency |
| SS | Soft-start timing | Capacitor-to-GND controls startup ramp rate; 0.1µF yields typical soft-start time |
| PWM | Digital dimming input | Active-low signal disables main switch and forces TG high; internal 50kΩ pulldown |
| CTRL | Analog current setpoint | 0–1V input scales LED current linearly (ILED = VCTRL/(10·RSENSE)); tie to VREF for full scale |
| VC | Error amplifier output | gm = 550µS; connects to RC compensation network for loop stability |
| FB | Voltage feedback input | 1.01V threshold regulates output voltage; used for overvoltage protection in LED strings |
| TGEN | PMOS gate enable | ≥1.5V enables TG driver; internal 40kΩ pulldown ensures safe default state |
| ISP / ISN | High-side current sense inputs | Differential pair measuring voltage across RSENSE; rail-to-rail operation supports full input range |
| TG | Top-gate driver output | Inverted PWM drives external PMOS; clamped to VISP – 7V for gate protection |
| SW | Power switch node | Connects to inductor/diode; minimize trace area to reduce EMI and switching losses |
| GND | Ground reference | Exclusively via exposed pad (Pin 17); must be soldered to large copper plane with thermal vias |
Key Features
| Feature | Design Value |
|---|---|
| True Color PWM™ dimming | 3000:1 ratio preserves color consistency across full dimming range without visible flicker |
| Integrated 2.3A/45V switch | Eliminates need for external MOSFET in most mid-power LED applications (≤1.5A LED current) |
| Multi-topology support | Native boost, buck, and buck-boost operation simplifies design reuse across varying VIN/VLED ratios |
| Open LED protection | Automatic shutdown when ISP–ISN voltage exceeds threshold prevents overvoltage damage to LEDs |
| PMOS gate driver (TG) | Enables fast, low-loss LED string disconnect during PWM off-time to prevent output capacitor discharge |
| Adjustable frequency & sync | RT resistor or SYNC pin allows EMI optimization and deterministic timing alignment in multi-channel systems |
Applications
| Automotive Headlight Modules | Industrial Display Backlighting |
|---|---|
Use Scenario: Adaptive front-lighting system (AFS) with dynamic beam shaping using multiple LED strings. IC Role / Device Role / Timing Role: Constant-current LED driver regulating individual zones; synchronized via SYNC pin across channels for coordinated dimming. Use Value: 3000:1 PWM dimming enables precise luminance control per zone without color shift; 40V transient tolerance withstands load-dump events. | Use Scenario: High-brightness LCD panel backlight for factory HMIs and medical displays. IC Role / Device Role / Timing Role: Buck-mode LED driver powering parallel white LED strings from 24V rail. Use Value: 100mV current sense minimizes power loss and heat generation; open-LED protection prevents single-string failure from disabling entire backlight. |
| Avionic Cabin Lighting | Barcode Scanner Illumination |
Use Scenario: Dimmable LED lighting in commercial aircraft cabins meeting DO-160 environmental requirements. IC Role / Device Role / Timing Role: Constant-voltage regulated driver for series-connected LEDs, using FB loop for output voltage stabilization. Use Value: –40°C to +125°C operating range ensures reliability at altitude; <1µA shutdown current extends battery backup runtime. | Use Scenario: Pulsed high-intensity illumination for rapid barcode capture in handheld scanners. IC Role / Device Role / Timing Role: Boost-mode driver delivering short, high-current pulses to LED array synchronized with image sensor exposure. Use Value: Fast transient response (<1µs recovery) enabled by stored VC charge during PWM off-time ensures consistent pulse amplitude across scanning cycles. |
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 4A switch current; supports up to 40V input; no integrated current sense amplifier | Requires external current sense amp and shunt; better suited for >2A LED loads | Select when higher output current or wider input range is required; adds complexity but increases headroom |
| LM3409QMH/NOPB | 3A switch; fixed 1.25V current sense threshold; no CTRL pin for analog dimming | Lacks 10:1 analog dimming; uses external PWM only; AEC-Q100 qualified | Prefer for automotive production where AEC-Q100 compliance is mandatory and analog dimming is unnecessary |
Compared with LTC3783EFE#TRPBF and LM3409QMH/NOPB, the LT3518EFE#TRPBF offers superior integration (built-in current sense amp, VREF, TG driver) and finer dimming control (3000:1 PWM + 10:1 analog), making it optimal for space-constrained, high-fidelity lighting designs where BOM count and color fidelity are critical.
Availability
LT3518EFE#TRPBF is available at Aetrix Electronics and suitable for automotive lighting, industrial display backlighting, and avionic cabin illumination requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT3518EFE#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 (now part of Analog Devices, Inc. following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3518EFE#TRPBF belongs to Linear's LED Driver product line, engineered specifically for high-efficiency, multi-topology constant-current LED regulation in demanding environments including automotive, aerospace, and industrial displays.
FAQ
What is the maximum continuous input voltage rating for the LT3518EFE#TRPBF?
The LT3518EFE#TRPBF supports continuous operation up to 30V on the VIN pin. It tolerates nonrepetitive 40V transients for up to one second, making it suitable for automotive 12V/24V systems subject to load-dump conditions. Exceeding 30V continuously risks exceeding thermal limits and reducing reliability, especially above 85°C ambient.
Does the LT3518EFE#TRPBF support buck, boost, and buck-boost configurations natively?
Yes, the LT3518EFE#TRPBF is explicitly designed to operate in all three topologies without external reconfiguration. Its dual-loop regulation architecture (current sense + voltage feedback), flexible SW node routing, and integrated gate driver (TG) enable seamless implementation of buck, boost, and buck-boost LED drivers using standard external components as shown in the datasheet's typical applications.
How does the CTRL pin function in the LT3518EFE#TRPBF, and what is its voltage range?
The CTRL pin on the LT3518EFE#TRPBF sets the LED current sense threshold linearly from 0V to 1V. At 0V, current is zero; at 1V, threshold is 100mV (full scale). Above 1V, the threshold clamps at 100mV. This enables 10:1 analog dimming when used with PWM dimming for extended dynamic range. The pin must never be left floating-tie to VREF if unused.
What package type and lead finish does the LT3518EFE#TRPBF use?
The LT3518EFE#TRPBF uses a 16-lead plastic TSSOP package (FE package) with lead-free (Pb-free) matte tin finish. It ships in tape-and-reel format (#TRPBF suffix), compatible with standard SMT assembly processes. The exposed pad (Pin 17) is GND and must be soldered to the PCB ground plane for thermal and electrical performance.
Can the LT3518EFE#TRPBF synchronize its switching frequency to an external clock?
Yes, the LT3518EFE#TRPBF supports external synchronization via the SYNC pin. When driven with a clean logic-level clock, the device aligns its power switch turn-on edge to the rising edge of SYNC. To ensure reliable locking, the RT resistor must be selected to set an internal oscillator frequency ~20% slower than the external SYNC frequency.
LT3518EFE#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 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:
- 2.3A (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
LT3518EFE#TRPBF FAQ
1.How can I place an order for LT3518EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3518EFE#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 LT3518EFE#TRPBF reliable?
The price and inventory of LT3518EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3518EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3518EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3518EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3518EFE#TRPBF?
LT3518EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3518EFE#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 LT3518EFE#TRPBF?
For technical support, including LT3518EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3518EFE#TRPBF requirements.
6.How does Aetrix verify that LT3518EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3518EFE#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 LT3518EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3518EFE#TRPBF?
All LT3518EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3518EFE#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 LT3518EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3518EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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