My Inquiry
My Account
Analog Devices Inc. LT3592IDDB#TRPBF
- Part No.:
- LT3592IDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3592IDDB#TRPBF.pdf
- Description:
- IC LED DRV RGLTR 50/500MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,467
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3592IDDB#TRPBF 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 with 10:1 analog/PWM dimming, operates from 3.6V to 36V input, integrates a 1.25A bipolar NPN switch, and uses an external sense resistor for precise current regulation. Its 10-lead DFN (3mm × 2mm) package supports thermal management in compact brake/tail light modules.
For engineers reviewing the LT3592IDDB#TRPBF datasheet, LT3592IDDB#TRPBF pinout, LT3592IDDB#TRPBF application, or LT3592IDDB#TRPBF equivalent, key selection criteria include its wide VIN range (3.6–36V), dual LED current settings (50mA/500mA), programmable switching frequency (400kHz–2.2MHz), shorted/open LED protection, and thermally enhanced DFN package with exposed GND pad.
Technical Context
The LT3592IDDB#TRPBF implements current-mode PWM control with cycle-by-cycle current limiting and internal slope compensation. Its instrumentation amplifier provides 60× gain in DIM mode and 6× gain in BRIGHT mode to scale the CAP–OUT sense voltage to 20mV or 200mV respectively, enabling accurate LED current regulation independent of VOUT.
Frequency foldback reduces switching frequency at low VOUT to limit peak inductor current during startup or overload. The DA pin monitors catch diode anode current to prevent runaway at high VIN/low duty cycle, while the BOOST pin-driven by an internal Schottky and external 0.1μF capacitor-ensures full saturation of the bipolar power switch.
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 via external sense resistor; 10% dimmed to 50mA using BRIGHT pin logic level. |
| Switching Frequency | 400kHz to 2.2MHz - programmed by RT-to-GND resistor; enables small inductors (e.g., 4.7μH at 2.2MHz). |
| Current Sense Accuracy | ±5% typical - achieved via precision 20mV/200mV sense thresholds referenced to internal 1.21V bandgap. |
| Thermal Shutdown | Enabled - protects device under sustained overload; junction temperature limit >125°C triggers shutdown. |
| Package | 10-Lead DFN (3mm × 2mm, 0.75mm height) - exposed pad soldered to PCB for θJA = 76°C/W thermal performance. |
| Operating Temp Range | –40°C to +125°C - qualified for automotive signal lighting and industrial ambient environments. |
Pinout & Package
LT3592IDDB#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 a PCB copper area for electrical grounding and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Oscillator frequency programming node | Connects to GND via resistor to set switching frequency (e.g., 140kΩ → 900kHz); determines minimum inductor size. |
| BRIGHT (2) | LED current scaling control | Logic-high (>1.4V) selects 500mA mode; logic-low (<0.3V) selects 50mA mode; supports 150Hz PWM dimming. |
| SHDN (3) | Regulator enable/disable input | Pull low to disable switching and reduce quiescent current to <2μA; supports PWM brightness control. |
| VIN (4) | Main power supply input | Supplies internal bias and switch driver; requires local 1μF ceramic bypass; absolute max 36V. |
| DA (5) | Catch diode anode sensing node | Monitors external Schottky diode current to prevent runaway at high VIN; can be grounded to disable. |
| SW (6) | Internal switch drain node | Connects to inductor and cathode of catch diode; switches at up to 1.25A peak; voltage swing up to VIN+BOOST. |
| BOOST (7) | Charge pump drive for switch saturation | Internally boosted above VIN via 0.1μF cap; enables full saturation of bipolar NPN switch for low VCESAT. |
| CAP (8) | Converter output & current sense reference | Connects to inductor, output capacitor, and top of sense resistor; serves as one input to current sense amp. |
| OUT (9) | LED string anode drive | Drives LED load; connects to bottom of sense resistor and top of VFB divider; clamped by voltage loop if open LED. |
| VFB (10) | Voltage feedback input | Sets maximum output voltage via resistor divider; forces VOUT = 1.21V × (R1/R2 + 1); prevents overvoltage on open LED. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage operation | 3.6V–36V input range enables direct connection to automotive battery rails without pre-regulator. |
| 10:1 analog dimming ratio | Single BRIGHT pin controls two precise current levels (50mA/500mA) via internal gain-switching amplifier. |
| Shorted and open LED protection | Current sense loop maintains regulation during short; voltage feedback loop clamps VOUT on open LED fault. |
| Thermally enhanced DFN package | 10-lead 3mm × 2mm DFN with exposed GND pad achieves 76°C/W junction-to-ambient thermal resistance. |
| Catch diode current monitoring | DA pin senses external diode current to slow oscillator and prevent runaway when VIN is high and duty cycle low. |
Applications
| Automotive Brake Lights | Industrial Signal Towers |
|---|---|
|
Use Scenario: Dual-intensity rear lighting system where 500mA drives bright brake illumination and 50mA maintains low-power tail light visibility. IC Role / Device Role / Timing Role: Constant-current LED driver with fast transient response to brake pedal activation; BRIGHT pin toggles between modes within <50μs. Use Value: Eliminates need for separate dimming circuitry; meets SAE J1399 photometric requirements across temperature. |
Use Scenario: Multi-color status indicator in factory automation panels requiring reliable red/green/yellow LED drive under 24V DC supply. IC Role / Device Role / Timing Role: Primary current regulator for series-connected LEDs; handles input transients per ISO 7637-2 pulse 5a. Use Value: Wide VIN range tolerates brownouts and surges; thermal shutdown prevents failure during enclosure overheating. |
| Constant-Current Power Supplies | LED Backlight Drivers |
|
Use Scenario: Precision 500mA current source for calibration equipment or sensor excitation circuits. IC Role / Device Role / Timing Role: Regulated current sink with <5% accuracy over –40°C to +125°C; VFB loop provides overvoltage safety. Use Value: Replaces discrete op-amp/transistor current sources with higher reliability and smaller footprint. |
Use Scenario: Low-noise backlight driver for industrial HMIs where EMI-sensitive displays require clean current delivery. IC Role / Device Role / Timing Role: High-frequency (2.2MHz) step-down controller minimizing conducted EMI; ceramic output caps suppress ripple. Use Value: Enables use of 4.7μH inductor and 3.3μF ceramic output cap - reducing board area by >40% vs. 400kHz designs. |
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; 500mA per channel; integrated MOSFET; 4.5–60V input. | Supports multi-string independent dimming and fault reporting; requires digital interface and layout for four channels. | Choose LT3965EFE#PBF for systems needing programmable per-string current, diagnostics, or >36V operation. |
| LM3409QMY/NOPB | Adjustable 1.25A buck LED driver; 6–42V input; analog/digital dimming; no integrated boost circuit. | Lacks internal BOOST charge pump - requires external bootstrap diode/cap; lower integration than LT3592IDDB#TRPBF. | Choose LM3409QMY/NOPB when higher peak current (1.25A) is required and external boost components are acceptable. |
Compared with LT3592IDDB#TRPBF, LT3965EFE#PBF adds digital control and multi-channel flexibility at the cost of increased BOM count and firmware dependency, while LM3409QMY/NOPB trades integrated boost functionality for higher current capability and wider VIN range.
Availability
LT3592IDDB#TRPBF is available at Aetrix Electronics and suitable for automotive signal lighting, industrial status indicators, and constant-current power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3592IDDB#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 ICs, serving automotive, industrial, and communications markets with robust, precision solutions.
The LT3592 product line was designed specifically for automotive-grade LED signal lighting applications, emphasizing wide-input operation, fault resilience, and thermal efficiency in compact surface-mount packages.
FAQ
What is the operating temperature range for the LT3592IDDB#TRPBF?
The LT3592IDDB#TRPBF is rated for continuous operation from –40°C to +125°C junction temperature. This grade (I-temp) is fully guaranteed across that range, making it suitable for under-hood automotive lighting and industrial enclosures. Thermal shutdown activates above 125°C to protect the device during transient overload conditions, and the exposed-pad DFN package supports reliable heat dissipation when soldered to adequate PCB copper area.
How does the LT3592IDDB#TRPBF achieve 10:1 LED dimming?
The LT3592IDDB#TRPBF achieves 10:1 dimming through internal gain switching of its current sense amplifier: when the BRIGHT pin is driven above 1.4V, the amplifier gain is 6×, resulting in 500mA output current for a 200mV sense voltage; when BRIGHT is below 0.3V, gain drops to 60×, yielding 50mA for the same 200mV threshold. This method ensures precise, temperature-stable current scaling without external DACs or additional resistors.
Can the LT3592IDDB#TRPBF drive more than two series LEDs?
Yes - the LT3592IDDB#TRPBF can drive any number of series LEDs as long as the total forward voltage remains within the output voltage limit set by the VFB resistor divider. For example, with a 12V output clamp, up to six standard red LEDs (2.0V each) or three white LEDs (3.6V each) may be supported. The current regulation remains accurate regardless of VOUT, provided the input voltage exceeds VOUT plus diode and switch drops.
What is the purpose of the DA pin on the LT3592IDDB#TRPBF?
The DA (Diode Anode) pin on the LT3592IDDB#TRPBF senses current flowing through the external catch diode to prevent current runaway during high-VIN, low-duty-cycle operation. When DA current exceeds an internal threshold, the oscillator frequency is reduced to extend minimum on-time and maintain regulation. This function is critical for automotive 24V systems driving low-VOUT LED strings and can be disabled by grounding the DA pin if not needed.
Does the LT3592IDDB#TRPBF require an external boost diode?
No - the LT3592IDDB#TRPBF integrates an internal Schottky diode for the BOOST charge pump function. A 0.1μF ceramic capacitor between BOOST and SW is sufficient for most applications. However, an external Schottky diode (e.g., BAS40) may be added in parallel with the internal diode to improve BOOST voltage generation in single-LED or very low-VOUT configurations where higher gate drive is beneficial.
LT3592IDDB#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)
LT3592IDDB#TRPBF FAQ
1.How can I place an order for LT3592IDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3592IDDB#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 LT3592IDDB#TRPBF reliable?
The price and inventory of LT3592IDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3592IDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3592IDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3592IDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3592IDDB#TRPBF?
LT3592IDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3592IDDB#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 LT3592IDDB#TRPBF?
For technical support, including LT3592IDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3592IDDB#TRPBF requirements.
6.How does Aetrix verify that LT3592IDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3592IDDB#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 LT3592IDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3592IDDB#TRPBF?
All LT3592IDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3592IDDB#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 LT3592IDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT3592IDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3592IDDB#TRPBF Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
