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Analog Devices Inc. LT3592EDDB#TRMPBF
- Part No.:
- LT3592EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3592EDDB#TRMPBF.pdf
- Description:
- IC LED DRV RGLTR 50/500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
LT3592EDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency, current-mode step-down DC/DC converter optimized as a constant-current LED driver for automotive signal lighting. It delivers up to 500mA output current across a 3.6V–36V input range, supports 10:1 PWM dimming via the BRIGHT pin, and integrates internal switch current sensing with shorted/open LED protection. Its primary circuit role is regulating high-brightness LED string current in brake/tail light modules.
For engineers reviewing the LT3592EDDB#TRMPBF datasheet, LT3592EDDB#TRMPBF pinout, LT3592EDDB#TRMPBF application, or LT3592EDDB#TRMPBF equivalent, key selection criteria include its 400kHz–2.2MHz programmable switching frequency, dual 50mA/500mA LED current settings, thermally enhanced 10-lead DFN (2mm × 3mm) package, and built-in catch-diode current sensing at the DA pin to prevent runaway under high-VIN, low-duty-cycle conditions.
Technical Context
The LT3592EDDB#TRMPBF employs a current-mode PWM architecture with cycle-by-cycle current limiting and thermal shutdown. Its oscillator frequency is resistor-programmable (RT pin), enabling precise control of inductor size and output ripple. The device uses an instrumentation amplifier with selectable gain (6× for DIM, 60× for BRIGHT mode) to sense voltage drop across an external CAP–OUT sense resistor, directly enforcing 20mV or 200mV regulation thresholds.
Voltage feedback is implemented via the VFB pin (1.21V reference), allowing output overvoltage clamping during open-LED fault conditions. The BOOST pin drives the internal bipolar NPN switch using a charge-pump network (0.1μF capacitor + internal Schottky), while the DA pin enables direct sensing of catch-diode current to trigger frequency foldback and prevent inductor current runaway at high input voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports 12V/24V automotive systems and industrial supplies without external pre-regulation. |
| Max Output Current | 500mA - set by external sense resistor; 10:1 dimming ratio enables 50mA/500mA dual-level operation. |
| Switching Frequency | 400kHz–2.2MHz - RT-resistor programmable; higher frequencies allow smaller inductors (e.g., 4.7μH at 2.2MHz). |
| Current Sense Threshold | 20mV (DIM) / 200mV (BRIGHT) - precise constant-current regulation with minimal power loss in sense resistor. |
| Package | 10-Lead DFN (2mm × 3mm, exposed pad) - θJA = 76°C/W; requires soldered GND pad for thermal and electrical integrity. |
| Protection Features | Shorted/open LED detection, thermal shutdown, undervoltage lockout (3.25V), and DA-pin-based catch-diode current limiting. |
| Operating Temp | –40°C to 125°C - qualified for automotive under-hood and exterior lighting environments. |
Pinout & Package
LT3592EDDB#TRMPBF is housed in a thermally enhanced 10-lead plastic DFN package (2mm × 3mm) with exposed GND pad (Pin 11). The package requires soldering of the exposed pad to PCB for thermal management and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Oscillator frequency programming | Resistor-to-GND sets switching frequency (e.g., 140kΩ → 900kHz); determines inductor size and ripple performance. |
| BRIGHT (2) | Dimming mode control | Logic-level input: <0.3V = DIM (50mA), >1.4V = BRIGHT (500mA); supports 150Hz PWM for intermediate brightness. |
| SHDN (3) | Regulator enable/disable | Active-high shutdown; pulls quiescent current to <2μA when low; supports PWM dimming at 150Hz. |
| VIN (4) | Main power input | Supplies internal bias and switch driver; must be locally bypassed with ≥1μF X7R ceramic capacitor. |
| DA (5) | Catch diode current sense | Connects to anode of external Schottky; triggers frequency foldback to prevent current runaway at high VIN/low duty cycle. |
| SW (6) | Internal switch output | Drives external inductor and cathode of catch diode; peak voltage reaches VIN + VBOOST. |
| BOOST (7) | Charge-pump drive | Internally generates ~VIN + 2.5V via 0.1μF cap + internal Schottky; enables full saturation of bipolar NPN switch. |
| CAP (8) | Converter output / current sense node | Connects to inductor, output capacitor, and top of LED sense resistor; serves as one input to current-sense amplifier. |
| OUT (9) | LED string anode drive | Drives LED string anode and bottom of sense resistor; second input to current-sense amplifier and overvoltage clamp feedback path. |
| VFB (10) | Voltage feedback input | 1.21V reference input; resistor divider between OUT and GND sets max output voltage (e.g., 12V clamp for 2-red-LED string). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable switching frequency | 400kHz–2.2MHz via single RT resistor - enables optimization of efficiency, size, and EMI for specific LED load and layout constraints. |
| Dual current setting (50mA/500mA) | Hardware-selectable 10:1 dimming ratio - eliminates need for external DAC or microcontroller for basic brake/tail light intensity differentiation. |
| Integrated catch-diode current sensing | DA pin monitors diode conduction directly - prevents inductor current runaway during high-VIN, low-duty-cycle operation without adding external components. |
| Thermally enhanced DFN package | 2mm × 3mm footprint with exposed GND pad - achieves 76°C/W junction-to-ambient thermal resistance for reliable operation in compact automotive housings. |
| Open/short LED fault protection | Dedicated circuitry detects LED string failure modes - maintains system safety and diagnostic capability without external comparators or monitoring ICs. |
Applications
| Automotive Brake Lights | Industrial Panel Indicators |
|---|---|
Use Scenario: Dual-intensity rear lighting on passenger vehicles where 500mA illuminates brake lights and 50mA maintains tail light visibility. IC Role / Device Role / Timing Role: Constant-current LED driver with hardware-selectable 10:1 dimming; regulates current independent of LED forward voltage drift over temperature. Use Value: Eliminates need for separate tail/brake drivers; reduces BOM count and PCB area while meeting SAE J585E photometric requirements. | Use Scenario: High-reliability status indication in factory automation HMIs exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Robust LED current source tolerant of 36V transients and –40°C to 125°C operation; provides stable luminance despite supply rail variation. Use Value: Enables direct connection to 24V industrial bus without pre-regulator; simplifies design and improves long-term calibration stability vs. resistor-driven LEDs. |
| Commercial Vehicle Signal Lighting | Outdoor Advertising Displays |
Use Scenario: Stop/tail lamp modules in trucks and buses requiring extended lifetime and vibration resilience. IC Role / Device Role / Timing Role: Step-down LED driver with shorted/open LED diagnostics and thermal shutdown - ensures fail-safe behavior during connector faults or LED degradation. Use Value: Reduces field returns due to LED open-circuit failures; supports predictive maintenance via fault flag reporting through SHDN pin sequencing. | Use Scenario: Brightness-controlled signage using red LED strings powered from unregulated solar-charged battery banks (12–32V range). IC Role / Device Role / Timing Role: Wide-input buck driver with programmable frequency and low-quiescent shutdown - extends battery runtime while maintaining consistent LED output. Use Value: Delivers >90% efficiency across full input range; enables use of small inductors and ceramics for lightweight, weather-resistant outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3490EDD#TRMPBF | Single-channel 500mA driver with integrated MOSFET; fixed 1.2MHz frequency; no DA pin or catch-diode current sensing. | Lacks high-VIN runaway protection; suited for lower-voltage (<20V) or space-constrained designs where DA functionality is unnecessary. | Select LTC3490EDD#TRMPBF only if input stays below 20V and thermal margin is ample; LT3592EDDB#TRMPBF remains preferred for 24V+ automotive use. |
| MAX16832ATP+ | 40V-rated buck LED driver; 500mA max; programmable frequency; includes PWM dimming but no DA-based frequency foldback. | No dedicated catch-diode current monitoring; relies on cycle-by-cycle current limit alone for high-VIN stability. | MAX16832ATP+ offers better high-temp spec (–40°C to +150°C), but LT3592EDDB#TRMPBF provides superior transient robustness in 36V automotive load-dump scenarios. |
Compared with LTC3490EDD#TRMPBF and MAX16832ATP+, the LT3592EDDB#TRMPBF uniquely combines DA-pin current sensing, 36V absolute max rating, and 10:1 hardware dimming in a 2mm × 3mm DFN-making it the most integrated solution for cost-sensitive, high-reliability automotive brake light modules.
Availability
LT3592EDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive signal lighting, industrial panel indicators, and commercial vehicle lighting requiring stable component supply, AEC-Q200-aligned reliability, and lead-free RoHS compliance.
Supply support for LT3592EDDB#TRMPBF 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.
The LT3592 product line was designed specifically for constant-current LED driving in harsh automotive and industrial environments, emphasizing wide input range, integrated protection, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LT3592EDDB#TRMPBF?
The LT3592EDDB#TRMPBF has an absolute maximum input voltage rating of 36V on the VIN pin. Operation above 36V risks permanent damage. The device is specified for continuous operation from 3.6V to 36V, making it suitable for 12V and 24V automotive systems including load-dump transients when properly filtered. Always observe the 36V limit in both steady-state and transient conditions.
How does the DA pin function in the LT3592EDDB#TRMPBF?
The DA pin in the LT3592EDDB#TRMPBF senses current flowing through the external catch diode's anode. When this current exceeds an internal threshold-common during high-VIN, low-duty-cycle operation-the LT3592EDDB#TRMPBF initiates frequency foldback to reduce switching frequency and prevent inductor current runaway. This feature is critical for stable operation in automotive applications where input voltage can reach 36V while driving low-VF LED strings.
Can the LT3592EDDB#TRMPBF drive more than two series LEDs?
Yes, the LT3592EDDB#TRMPBF can drive multiple series LEDs provided the total forward voltage remains within the device's output voltage capability. The maximum output voltage is set by the VFB resistor divider and limited by the BOOST pin's 60V absolute maximum rating. For example, with a 12V clamp and proper inductor/capacitor selection, the LT3592EDDB#TRMPBF reliably drives 3–4 red LEDs or 2 white LEDs in series under typical 12V–24V input conditions.
What is the purpose of the BOOST pin in the LT3592EDDB#TRMPBF?
The BOOST pin in the LT3592EDDB#TRMPBF supplies a boosted gate drive voltage (~VIN + 2.5V) to the internal bipolar NPN power switch. This is generated using an internal Schottky diode and an external 0.1μF capacitor connected between BOOST and SW. The boosted voltage ensures full saturation of the switch, minimizing conduction losses and maximizing efficiency-especially critical at high output currents like the 500mA maximum supported by the LT3592EDDB#TRMPBF.
Does the LT3592EDDB#TRMPBF require an external catch diode?
Yes, the LT3592EDDB#TRMPBF requires an external Schottky catch diode connected between the SW and OUT pins. A 500mA–1A Schottky diode with ≥40V reverse voltage rating (e.g., ON Semiconductor MBRA140T3) is recommended. The DA pin connects to the anode of this diode to enable current-runaway protection. Omitting the diode will cause catastrophic failure due to lack of freewheeling path during switch-off.
LT3592EDDB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3.6V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 30V
- Current - Output / Channel:
- 50mA, 500mA
- Frequency:
- 400kHz ~ 2.2MHz
- Dimming:
- -
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LT3592EDDB#TRMPBF FAQ
1.How can I place an order for LT3592EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3592EDDB#TRMPBF 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 LT3592EDDB#TRMPBF reliable?
The price and inventory of LT3592EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3592EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3592EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3592EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3592EDDB#TRMPBF?
LT3592EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3592EDDB#TRMPBF 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 LT3592EDDB#TRMPBF?
For technical support, including LT3592EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3592EDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3592EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3592EDDB#TRMPBF 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 LT3592EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3592EDDB#TRMPBF?
All LT3592EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3592EDDB#TRMPBF, 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 LT3592EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3592EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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