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Analog Devices Inc. LT3592EDDB#TRPBF
- Part No.:
- LT3592EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3592EDDB#TRPBF.pdf
- Description:
- IC LED DRV RGLTR 50/500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,028
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Product details
Overview
LT3592EDDB#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency, current-mode step-down DC/DC LED driver IC with integrated 1.25A bipolar NPN switch, designed for constant-current driving of high-brightness LED strings. It operates from 3.6V to 36V input, delivers up to 500mA output current, supports 10:1 analog/PWM dimming via BRIGHT pin, and features shorted/open LED protection. It is used in automotive brake/tail lighting systems requiring robust, wide-input, thermally efficient LED control.
For engineers reviewing the LT3592EDDB#TRPBF datasheet, LT3592EDDB#TRPBF pinout, LT3592EDDB#TRPBF application, or LT3592EDDB#TRPBF equivalent, key selection criteria include its 3.6–36V input range, 400kHz–2.2MHz programmable switching frequency, internal current sense amplifier with 6×/60× gain select, DA-pin-based catch diode current monitoring, and thermal shutdown in the 10-lead 3mm × 2mm DFN package with exposed GND pad.
Technical Context
The LT3592EDDB#TRPBF implements a constant-frequency current-mode PWM architecture with cycle-by-cycle current limiting and active soft-start. Its dual-loop control uses an instrumentation amplifier (gain = 6 for DIM, 60 for BRIGHT) sensing voltage across an external CAP–OUT sense resistor, while a separate voltage feedback loop (VFB = 1.21V reference) clamps maximum output voltage to prevent open-LED overvoltage.
Switching frequency is resistor-programmed via RT pin (357kΩ → 400kHz, 140kΩ → 900kHz, 48.7kΩ → 2.2MHz); BOOST pin drives the internal NPN switch using a charge-pump capacitor; DA pin enables direct sensing of catch diode current to prevent runaway at high VIN/low duty cycle; SHDN pin provides <2μA shutdown quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports 12V/24V automotive battery rails with transient tolerance up to absolute max 36V. |
| Max Output Current | 500mA - set by external sense resistor; 10% dimmed mode delivers 50mA for nighttime brake lights. |
| Switching Frequency | 400kHz–2.2MHz - selectable via RT resistor; higher frequencies enable smaller inductors (e.g., 4.7μH @ 2.2MHz). |
| Current Sense Accuracy | 200mV (BRIGHT) / 20mV (DIM) sense threshold - enables precise LED current regulation independent of VOUT. |
| Package | 10-Lead (3mm × 2mm) DFN with exposed thermal pad - θJA = 76°C/W; requires PCB soldering of exposed pad for thermal and electrical GND. |
| Protection Features | Shorted/open LED detection, thermal shutdown, undervoltage lockout (3.25V), and DA-pin current runaway prevention. |
| Operating Temp Range | –40°C to +125°C junction - qualified for automotive signal lighting per AEC-Q100 stress test conditions. |
Pinout & Package
LT3592EDDB#TRPBF is housed in a thermally enhanced 10-lead plastic DFN package (3mm × 2mm) with exposed GND pad (Pin 11). The package requires soldering of the exposed pad to PCB for thermal dissipation and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator frequency programming node | Connects to ground via resistor to set switching frequency (e.g., 140kΩ → 900kHz); determines minimum on-time and ripple performance. |
| BRIGHT (Pin 2) | Dimming mode select input | Logic-high (>1.4V) enables 500mA full brightness; logic-low (<0.3V) enables 50mA dim mode; supports 150Hz PWM dimming. |
| SHDN (Pin 3) | Shutdown control input | Pull low to disable switching and reduce quiescent current to <2μA; supports PWM dimming when toggled at 150Hz. |
| VIN (Pin 4) | Main power supply input | Supplies internal bias and switch driver; must be locally bypassed with ≥1μF X7R ceramic capacitor near the pin. |
| DA (Pin 5) | Catch diode anode sense input | Monitors external Schottky diode current to prevent runaway during high-VIN/low-duty operation; can be grounded to disable. |
| SW (Pin 6) | Internal switch drain node | Connects to inductor and cathode of external catch diode; carries high di/dt switching current; layout critical for EMI. |
| BOOST (Pin 7) | Charge-pump drive output | Drives internal NPN switch base via 0.1μF capacitor to SW; external Schottky optional for improved boost at low VOUT. |
| CAP (Pin 8) | Converter output & current sense input | Connects to inductor, output capacitor, and top of external sense resistor; serves as one input to current-sense amplifier. |
| OUT (Pin 9) | LED string anode drive | Drives LED load anode and connects to bottom of sense resistor and top of VFB divider; second input to current-sense amplifier. |
| VFB (Pin 10) | Voltage feedback input | Connects to resistor divider between OUT and GND; regulates max output voltage to 1.21V × (R1/R2 + 1); protects against open-LED fault. |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmable switching frequency | 400kHz–2.2MHz range enables optimization of inductor size, efficiency, and EMI without changing IC - e.g., 2.2MHz allows 4.7μH inductor in space-constrained automotive modules. |
| 10:1 analog dimming with dual-gain current sense | 60× gain at BRIGHT pin (200mV sense) and 6× gain at DIM pin (20mV sense) provide accurate, stable current regulation across both modes without recalibration. |
| DA-pin based catch diode current monitoring | Direct sensing of external diode anode current prevents output current runaway under high-VIN/low-duty conditions - critical for 24V+ automotive transients. |
| Integrated shorted/open LED protection | Hardware-level fault detection shuts down switching and flags error conditions without MCU intervention - meets ASIL-B functional safety requirements for signal lighting. |
| Thermally enhanced 10-lead DFN package | Exposed GND pad and 76°C/W θJA enable >500mA continuous operation at +85°C ambient without heatsink - reduces system cost vs. larger packages. |
Applications
| Automotive Brake/Tail Lights | Industrial Panel Indicator Lighting |
|---|---|
Use Scenario: High-reliability rear lighting module operating from 12V/24V vehicle battery with cold-cranking (down to 6V) and load-dump (up to 36V) transients. IC Role / Device Role / Timing Role: Constant-current LED driver with 10:1 dimming, open-LED fault detection, and thermal shutdown - serves as primary current regulator and safety monitor. Use Value: Eliminates need for external current-sense op-amp and discrete protection circuitry; achieves >90% efficiency at 500mA with 2 red LEDs and 10μH inductor. |
Use Scenario: DIN-rail mounted HMI panel with status indicators requiring stable brightness across 18–32V industrial power supplies. IC Role / Device Role / Timing Role: Wide-input, adjustable-current LED driver supporting analog dimming via PLC I/O voltage and PWM from microcontroller. Use Value: Single-chip solution replaces multi-component discrete drivers; 400kHz operation enables use of low-cost, high-saturation-current inductors. |
| Commercial Vehicle Signal Lighting | Emergency Vehicle Flashing Beacons |
Use Scenario: Heavy-duty truck tail lamp assembly exposed to vibration, wide temperature swings (–40°C to +125°C), and EMI from alternators and motors. IC Role / Device Role / Timing Role: Robust LED current controller with DA-pin current monitoring and shorted-LED protection - ensures fail-safe operation during wiring faults. Use Value: Meets SAE J1455 mechanical shock/vibe requirements; exposed-pad DFN maintains thermal stability under sustained 500mA load. |
Use Scenario: Police/fire/emergency vehicle beacon using high-intensity red/amber LEDs requiring rapid 150Hz PWM dimming and fault reporting. IC Role / Device Role / Timing Role: Fast-response LED driver enabling sub-50μs transition between 50mA (standby) and 500mA (flash) current levels. Use Value: Internal current-mode control and low propagation delay deliver crisp flash edges; SHDN/BRIGHT pins support dual-path dimming control. |
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 |
|---|---|---|---|
| LT3965EFE#PBF | 4-channel, I²C-programmable LED driver with 500mA per channel; includes fault reporting registers and spread-spectrum switching. | Targeted at multi-string RGB or matrix lighting where digital control and diagnostics are required - not drop-in compatible. | Select LT3965EFE#PBF only when system-level digital bus control, channel independence, or fault logging are mandatory. |
| TPS92692QPWPRQ1 | Automotive-grade buck LED controller (external MOSFET); supports 65V input, 100:1 PWM dimming, and integrated current sense amp with 10mV threshold. | Requires external high-side N-channel MOSFET and gate driver; suited for >1A or >40V applications where LT3592EDDB#TRPBF's integrated switch is insufficient. | Choose TPS92692QPWPRQ1 for designs needing >500mA, >36V input, or AEC-Q100 Grade 0 qualification beyond LT3592EDDB#TRPBF's Grade 1. |
Compared with LT3592EDDB#TRPBF, LT3965EFE#PBF adds digital configurability but increases BOM count and firmware dependency, while TPS92692QPWPRQ1 extends voltage/current capability at the cost of external FET complexity and reduced integration - LT3592EDDB#TRPBF remains optimal for single-string, 500mA, 36V-max automotive signal lighting with minimal component count.
Availability
LT3592EDDB#TRPBF is available at Aetrix Electronics and suitable for automotive signal lighting, industrial panel indicators, and commercial vehicle lighting requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT3592EDDB#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT3592 product line was developed specifically for robust, wide-input, constant-current LED driving in harsh environments - targeting automotive brake/tail lamps, emergency lighting, and industrial status indicators where reliability, thermal efficiency, and fault resilience are critical.
FAQ
What is the maximum input voltage rating for the LT3592EDDB#TRPBF?
The LT3592EDDB#TRPBF has an absolute maximum input voltage rating of 36V on the VIN pin. Continuous operation is specified from 3.6V to 36V, with undervoltage lockout engaging below 3.25V. Transient overvoltage events up to 36V are tolerated, but sustained operation above 36V risks permanent damage. For automotive load-dump protection, external TVS clamping is recommended.
How does the BRIGHT pin control dimming on the LT3592EDDB#TRPBF?
The BRIGHT pin on the LT3592EDDB#TRPBF selects between two LED current levels: applying ≥1.4V sets 500mA full brightness (60× current sense gain), while ≤0.3V sets 50mA dim mode (6× gain). It accepts DC voltage or 150Hz PWM signals, enabling seamless transitions with <50μs settling time. The pin tolerates up to 36V and interfaces directly with microcontroller GPIO or automotive logic.
Can the LT3592EDDB#TRPBF drive more than two series LEDs?
Yes - the LT3592EDDB#TRPBF can drive any number of series LEDs as long as the total forward voltage (VF) remains within the device's output voltage capability. The maximum VOUT is limited by the VFB loop (set via resistor divider) and must stay ≤30V (CAP–OUT rating). For example, with 3.2V red LEDs, up to nine LEDs (28.8V) can be driven safely if VFB is configured for ≥30V clamp and input voltage is sufficient.
What is the purpose of the DA pin on the LT3592EDDB#TRPBF?
The DA (Diode Anode) pin on the LT3592EDDB#TRPBF senses current through the external catch diode to prevent output current runaway during high-input-voltage, low-duty-cycle operation - common in 24V automotive systems. When DA current exceeds the internal threshold, the oscillator frequency folds back to limit peak inductor current. Grounding DA disables this function.
Is the LT3592EDDB#TRPBF RoHS-compliant and lead-free?
Yes - the LT3592EDDB#TRPBF carries a lead-free finish and is RoHS-compliant per EU Directive 2011/65/EU. The "#TRPBF" suffix denotes tape-and-reel packaging with Pb-free (matte tin) termination. Full compliance documentation, including substance declarations and test reports, is available from Analog Devices' official product page for LT3592EDDB#TRPBF.
LT3592EDDB#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT3592EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3592EDDB#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 LT3592EDDB#TRPBF reliable?
The price and inventory of LT3592EDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3592EDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3592EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3592EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3592EDDB#TRPBF?
LT3592EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3592EDDB#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 LT3592EDDB#TRPBF?
For technical support, including LT3592EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3592EDDB#TRPBF requirements.
6.How does Aetrix verify that LT3592EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3592EDDB#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 LT3592EDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3592EDDB#TRPBF?
All LT3592EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3592EDDB#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 LT3592EDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3592EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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