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Analog Devices Inc. LT3592IDDB#TRMPBF
- Part No.:
- LT3592IDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3592IDDB#TRMPBF.pdf
- Description:
- IC LED DRV RGLTR 50/500MA 10DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT3592IDDB#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, operates from 3.6V to 36V input, supports 10:1 PWM dimming via the BRIGHT pin, and integrates internal switch current sensing with shorted/open LED protection. It targets brake/tail light systems requiring stable high-brightness operation under wide automotive voltage transients.
For engineers reviewing the LT3592IDDB#TRMPBF datasheet, LT3592IDDB#TRMPBF pinout, LT3592IDDB#TRMPBF application, or LT3592IDDB#TRMPBF equivalent, key selection criteria include its 400kHz–2.2MHz programmable switching frequency, dual 50mA/500mA LED current settings, thermal shutdown, and DFN-10 (3mm × 2mm) package with exposed ground pad for enhanced thermal performance in space-constrained lighting modules.
Technical Context
The LT3592IDDB#TRMPBF employs current-mode PWM control with cycle-by-cycle current limiting and built-in slope compensation, enabling fast transient response during LED brightness transitions. Its instrumentation amplifier provides 60× gain in dim mode and 6× gain in bright mode, directly regulating the CAP–OUT voltage drop across an external sense resistor to 20mV or 200mV respectively.
It features frequency foldback at low VOUT, DA-pin-based catch diode current sensing to prevent runaway at high VIN/low duty cycle, and BOOST pin drive (via internal Schottky + optional external diode) to fully saturate the internal bipolar NPN switch. The RT pin sets oscillator frequency with ±10% tolerance over temperature using a single resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports full automotive battery range including cold-crank (6V) and load-dump (36V) events without external protection. |
| Max Output Current | 500mA - set by external sense resistor; enables driving two series red LEDs at full brightness in automotive brake lights. |
| Dimming Ratio | 10:1 - achieved via BRIGHT pin logic-level control (≥1.4V = bright, ≤0.3V = dim), enabling nighttime tail-light intensity reduction. |
| Switching Frequency | 400kHz–2.2MHz - programmable with RT resistor; higher frequencies allow smaller inductors (e.g., 4.7μH at 2.2MHz) and reduced EMI footprint. |
| Current Sense Accuracy | ±5% typical - based on 200mV (bright) / 20mV (dim) reference across sense resistor; ensures consistent LED luminance across temperature. |
| Thermal Shutdown | 150°C junction - protects against sustained overload or poor PCB heatsinking; auto-recovery after cooldown. |
| Package | 10-Lead DFN (3mm × 2mm, 0.75mm height) with exposed GND pad - θJA = 76°C/W; requires soldered thermal pad for rated power dissipation. |
Pinout & Package
LT3592IDDB#TRMPBF uses a thermally enhanced 10-lead plastic DFN package (3mm × 2mm) with exposed GND pad (Pin 11). The pad must be soldered to a PCB copper area for electrical grounding and thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Oscillator frequency programming node | Connects to ground via resistor (e.g., 140kΩ → 900kHz); sets minimum on-time and ripple characteristics. |
| BRIGHT (2) | LED current mode select | Logic-level input: ≥1.4V → 500mA mode; ≤0.3V → 50mA mode; supports 150Hz PWM for analog-like dimming. |
| SHDN (3) | Regulator enable/disable control | Active-high; drives <2μA quiescent current when low; supports PWM dimming or system-level sleep control. |
| VIN (4) | Main power input | Supplies internal bias and switch driver; requires local 1μF X7R ceramic bypass; withstands 36V absolute max. |
| DA (5) | Catch diode anode sense | Monitors external Schottky diode current to throttle switching frequency and prevent runaway at high VIN/low duty cycle. |
| SW (6) | Internal switch drain node | Connects to inductor and cathode of catch diode; switches at full input voltage swing; peak current limited to 1.25A. |
| BOOST (7) | Charge pump drive for NPN base | Internally boosted above VIN via 0.1μF capacitor; enables full saturation of internal bipolar switch for low VCE(sat). |
| CAP (8) | Converter output & current sense reference | Connects to inductor, output capacitor, and top of sense resistor; serves as one input to current-sense amplifier. |
| OUT (9) | LED string anode drive | Drives LED cathodes via sense resistor; second input to current-sense amplifier; clamped by VFB loop if LED opens. |
| VFB (10) | Voltage feedback input | Sets maximum output voltage via resistor divider (1.21V reference); prevents overvoltage damage during open-LED fault. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range (3.6V–36V) | Eliminates need for pre-regulator in 12V/24V automotive systems; handles cold-crank and load-dump without derating. |
| Integrated shorted/open LED protection | Prevents thermal runaway or overvoltage failure during LED string faults-no external monitoring circuitry required. |
| Resistor-programmable switching frequency | Enables optimization of inductor size, efficiency, and EMI profile per application (e.g., 900kHz for compact 2-LED brake lights). |
| Catch diode current sensing (DA pin) | Actively throttles switching frequency when catch diode current exceeds threshold-critical for stable operation at VIN > 24V. |
| Thermally enhanced DFN package | Exposed GND pad reduces thermal resistance (θJC = 13.5°C/W); allows 500mA continuous operation with minimal PCB copper area. |
Applications
| Automotive Brake Lights | Industrial Status Indicators |
|---|---|
Use Scenario: Dual-intensity rear lighting where 500mA drives bright brake activation and 50mA maintains visible tail-light presence at night. IC Role / Device Role / Timing Role: Constant-current source with 10:1 dimming ratio, regulated via BRIGHT pin logic level and internal current-sense amplifier. Use Value: Eliminates need for separate dimming MOSFET or microcontroller GPIO; achieves <50μs transition between brightness levels per datasheet. |
Use Scenario: High-reliability panel-mounted status indicators in factory automation cabinets exposed to 24VDC industrial supplies. IC Role / Device Role / Timing Role: Primary LED driver with open-LED fault protection and wide-input operation to tolerate supply fluctuations. Use Value: Prevents catastrophic failure during LED open-circuit events; maintains safe operation without external supervision circuitry. |
| Commercial Vehicle Signal Lighting | Emergency Vehicle Flashers |
Use Scenario: Stop/tail lamp modules in trucks and buses operating across 9V–32V battery range with vibration-induced connector intermittency. IC Role / Device Role / Timing Role: Robust step-down LED driver with undervoltage lockout (3.25V) and thermal shutdown. Use Value: Ensures reliable illumination during cranking; survives repeated load-dump transients without latch-up or parameter shift. |
Use Scenario: High-duty-cycle flashing circuits in police/fire vehicles where rapid on/off cycling stresses LED drivers. IC Role / Device Role / Timing Role: Fast-response current regulator with frequency foldback to maintain stable current during startup and overload. Use Value: Delivers consistent flash intensity across battery voltage sag; avoids current droop or thermal throttling during extended flash sequences. |
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; supports 10-bit dimming; requires external MCU interface. | Targeted at multi-zone lighting with digital control; not pin-compatible; larger 24-lead TSSOP package. | Select when system requires independent per-channel dimming, diagnostics, or fault reporting via I²C. |
| LM3409QMY/NOPB | Single-channel buck LED driver; 1.25A switch current; 6V–42V input; no integrated DA-pin current sensing or 10:1 dimming logic. | Requires external PWM generator and current-sense amp for dimming; lacks open/short LED protection logic. | Select when higher peak current (>500mA) or wider input range (up to 42V) is needed, and discrete control is acceptable. |
Compared with LT3592IDDB#TRMPBF, LT3965EFE#PBF offers digital configurability but adds system complexity and cost, while LM3409QMY/NOPB provides higher current headroom but requires external circuitry to match the integrated safety and dimming features of the LT3592IDDB#TRMPBF.
Availability
LT3592IDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive signal lighting, industrial status indicators, and commercial vehicle lighting requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT3592IDDB#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) designs precision analog, mixed-signal, and power management ICs for high-reliability industrial, automotive, and communications systems.
The LT3592 product line was developed specifically for automotive LED signal lighting applications, emphasizing robustness across wide input voltage ranges, integrated fault protection, and simplified 10:1 dimming without external controllers.
FAQ
What is the operating temperature range for the LT3592IDDB#TRMPBF?
The LT3592IDDB#TRMPBF is specified for –40°C to +125°C junction temperature and is guaranteed over this full range. Its thermal shutdown activates at ~150°C to protect against sustained overload. The "I" grade designation confirms industrial-temperature qualification, making LT3592IDDB#TRMPBF suitable for under-hood automotive environments and industrial enclosures without derating.
How does the DA pin function in the LT3592IDDB#TRMPBF?
The DA pin in the LT3592IDDB#TRMPBF senses current through the external catch diode's anode to prevent current runaway at high input voltages and low duty cycles. When DA pin current exceeds the internal threshold, the LT3592IDDB#TRMPBF reduces switching frequency to limit peak inductor current. This feature is critical for stable operation above 24V input and can be disabled by grounding the DA pin.
Can the LT3592IDDB#TRMPBF drive more than two series LEDs?
Yes-the LT3592IDDB#TRMPBF can drive multiple series LEDs as long as the total forward voltage remains below the programmed VOUT limit (set by the VFB resistor divider) and within the 36V absolute maximum BOOST pin rating. For example, with a 32V VOUT clamp and red LEDs (~2.1V each), up to 15 LEDs may be driven. However, efficiency and thermal performance must be verified per configuration using the LT3592IDDB#TRMPBF's minimum input voltage equations.
What is the purpose of the BOOST pin in the LT3592IDDB#TRMPBF?
The BOOST pin in the LT3592IDDB#TRMPBF supplies a charge-pump–boosted voltage (typically VIN + 3V to VIN + 5V) to the base of the internal bipolar NPN power switch. This ensures full saturation and low VCE(sat) (~300mV at 500mA), maximizing efficiency. An internal Schottky diode and external 0.1μF capacitor form the boost circuit; an external Schottky (e.g., BAS40) may be added for improved performance at low VOUT.
Does the LT3592IDDB#TRMPBF require an external catch diode?
Yes-the LT3592IDDB#TRMPBF requires an external Schottky catch diode (e.g., MBRA140T3 or CMMSH1-40) connected between SW and GND. The diode must withstand ≥36V reverse voltage and conduct ≥500mA average current. Its anode connects to the DA pin for current sensing, and its cathode connects to SW. No internal catch diode is integrated; omission will cause immediate failure.
LT3592IDDB#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)
LT3592IDDB#TRMPBF FAQ
1.How can I place an order for LT3592IDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3592IDDB#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 LT3592IDDB#TRMPBF reliable?
The price and inventory of LT3592IDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3592IDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3592IDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3592IDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3592IDDB#TRMPBF?
LT3592IDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3592IDDB#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 LT3592IDDB#TRMPBF?
For technical support, including LT3592IDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3592IDDB#TRMPBF requirements.
6.How does Aetrix verify that LT3592IDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3592IDDB#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 LT3592IDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3592IDDB#TRMPBF?
All LT3592IDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3592IDDB#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 LT3592IDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT3592IDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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