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Analog Devices Inc. LT3592IMSE#PBF
- Part No.:
- LT3592IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3592IMSE#PBF.pdf
- Description:
- IC LED DRVR RGLTR 50MA/ 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:383
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Product details
Overview
LT3592IMSE#PBF 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 10-lead MSOP package enables compact, thermally robust placement in brake/tail light modules.
For engineers reviewing the LT3592IMSE#PBF datasheet, LT3592IMSE#PBF pinout, LT3592IMSE#PBF application, or LT3592IMSE#PBF equivalent, key selection criteria include its 400kHz–2.2MHz resistor-programmable switching frequency, dual LED current settings (50mA/500mA), catch-diode current sensing on DA pin, thermal shutdown, and automotive-grade –40°C to 125°C operation.
Technical Context
The LT3592IMSE#PBF employs current-mode PWM control with cycle-by-cycle current limiting and fast transient response. Its internal bipolar NPN power switch is driven by a BOOST pin circuit using an internal Schottky diode and external 0.1μF capacitor, enabling full saturation at high duty cycles.
It features dual-loop regulation: an instrumentation amplifier senses voltage drop across an external CAP–OUT sense resistor (200mV in bright mode, 20mV in dim mode), while a separate VFB voltage feedback loop clamps output voltage to prevent damage during open-LED fault conditions. Frequency foldback reduces switching frequency under low-VOUT conditions to maintain stable current regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports direct connection to automotive battery (9V–16V nominal) with headroom for load dump transients. |
| Output Current | 50mA or 500mA - selectable via BRIGHT pin logic level; enables dual-intensity signaling (e.g., daytime running vs. nighttime brake). |
| Switching Frequency | 400kHz to 2.2MHz - set by RT-to-GND resistor; higher frequencies allow smaller inductors (e.g., 4.7μH at 2.2MHz) and reduced EMI footprint. |
| Current Sense Accuracy | ±5% typical - achieved via precision 200mV/20mV sense thresholds and gain-of-60/gain-of-6 instrumentation amplifier. |
| Thermal Protection | Internal thermal shutdown - disables switching above safe junction temperature; recovers automatically after cooldown. |
| Package | 10-Lead MSOP (3mm × 3mm) with exposed pad - θJA = 38°C/W; requires soldered exposed pad for thermal and electrical GND integrity. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive environments per AEC-Q100 stress test guidelines. |
Pinout & Package
LT3592IMSE#PBF uses a thermally enhanced 10-lead MSOP package (MSE) with exposed pad (Pin 11) that must be soldered to PCB for GND connection and thermal dissipation. Pin pitch is 0.5mm; body dimensions are 3mm × 3mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Oscillator frequency programming node | Connects to ground via resistor (e.g., 140kΩ for 900kHz); sets minimum on-time and ripple characteristics. |
| BRIGHT (2) | Dimming mode select input | Logic-high (>1.4V) enables 500mA; logic-low (<0.3V) enables 50mA; supports 150Hz PWM for analog-like dimming. |
| SHDN (3) | Shutdown control input | Pull below 0.3V to disable regulator and reduce quiescent current to <2μA; supports PWM brightness control. |
| VIN (4) | Main power input | Supplies internal bias and switch driver; requires local 1μF ceramic bypass; accepts up to 36V continuous. |
| DA (5) | Catch diode anode sense | Monitors external Schottky diode current to prevent runaway at high VIN/low duty cycle; ties to diode anode. |
| 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 output | Provides >VIN voltage to drive internal NPN switch base; tied to SW via 0.1μF capacitor; optional external Schottky improves boost efficiency. |
| CAP (8) | Converter output & current sense reference | 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 cathodes via external sense resistor; second input to current-sense amplifier; connects to top LED anode in series string. |
| VFB (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 overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmable switching frequency | Enables optimization of inductor size, efficiency, and EMI profile across 400kHz–2.2MHz without changing IC. |
| Dual LED current modes (50mA / 500mA) | Supports functional safety requirements: low-current standby mode and high-current active signaling in same hardware. |
| Shorted and open LED fault protection | Prevents thermal runaway during LED short and limits output voltage to safe level during LED open-circuit failure. |
| Catch diode current sensing on DA pin | Eliminates need for additional current-sense components while preventing inductor current overshoot at high VIN/low VOUT. |
| Integrated BOOST charge pump with internal Schottky | Removes requirement for external boost diode in most applications, reducing BOM count and layout complexity. |
Applications
| Automotive Brake/Tail Lights | Industrial Hazard Warning Lights |
|---|---|
Use Scenario: Dual-intensity rear lighting system where 50mA indicates vehicle presence and 500mA activates during braking. IC Role / Device Role / Timing Role: Constant-current LED driver with 10:1 dimming ratio, regulated by BRIGHT pin logic and protected against LED faults. Use Value: Meets SAE J1399 photometric requirements for luminance contrast between tail and brake states without external current-setting DACs. | Use Scenario: High-reliability warning beacon in factory automation systems requiring visible indication under ambient lighting >10,000 lux. IC Role / Device Role / Timing Role: Primary current source for red LED strings, operating from wide-input industrial 24V rail with immunity to brownout events. Use Value: Maintains consistent LED brightness across 18V–36V input variation and survives 40V load-dump transients per ISO 7637-2. |
| Commercial Vehicle Turn Signals | Outdoor Signage Power Supplies |
Use Scenario: Flashing amber turn indicator on trucks and buses powered from 12V/24V battery systems with variable state-of-charge. IC Role / Device Role / Timing Role: Regulated current source synchronized to flasher timer; SHDN pin used for enable/disable control. Use Value: Delivers stable 500mA pulse current independent of battery voltage sag during cranking (down to 6V). | Use Scenario: Constant-current supply for segmented LED displays in outdoor kiosks exposed to temperature extremes (–40°C to +85°C ambient). IC Role / Device Role / Timing Role: LED driver with integrated thermal shutdown and voltage-clamp protection for unattended operation. Use Value: Eliminates need for external overvoltage crowbar or thermal cutoff circuits, reducing system-level BOM cost by ≥3 components. |
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 |
|---|---|---|---|
| LT3965IMSE#PBF | Higher 3A switch current rating; supports up to 8 LEDs in series; includes I²C interface for digital dimming and fault reporting. | Targeted at multi-string architectural lighting; adds communication overhead not needed in basic signal lighting. | Select when digital diagnostics, higher current, or multi-channel control are required; not drop-in compatible due to different pinout and control architecture. |
| TPS92630QPWPRQ1 | Automotive-qualified (AEC-Q100 Grade 1); integrated MOSFET; supports 100:1 analog dimming; lower 2.5V min input voltage. | Optimized for low-voltage stop-start systems; lacks DA pin for catch-diode current sensing. | Prefer for new automotive designs requiring AEC-Q100 Grade 1 qualification and ultra-low VIN operation; requires layout revision. |
Compared with LT3592IMSE#PBF, LT3965IMSE#PBF offers scalable channel count and digital control but increases design complexity, while TPS92630QPWPRQ1 provides tighter automotive qualification and lower VIN support at the expense of analog dimming resolution and fault-sensing capability.
Availability
LT3592IMSE#PBF is available at Aetrix Electronics and suitable for automotive signal lighting, industrial hazard indicators, commercial vehicle turn signals, and outdoor signage requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3592IMSE#PBF 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 industrial, automotive, communications, and healthcare markets.
The LT3592 product line was designed specifically for automotive and industrial constant-current LED applications requiring wide input range, robust fault protection, and precise dimming control - with emphasis on reliability under harsh electrical and thermal conditions.
FAQ
What is the maximum output current supported by the LT3592IMSE#PBF?
The LT3592IMSE#PBF supports two fixed output current levels: 50mA in dim mode and 500mA in bright mode. These are set by the voltage applied to the BRIGHT pin (≤0.3V for dim, ≥1.4V for bright) and enforced by internal current-sense amplifier gains of 6 and 60, respectively. The 500mA level is the absolute maximum DC output current specified for continuous operation.
Does the LT3592IMSE#PBF require an external catch diode?
Yes, the LT3592IMSE#PBF requires an external Schottky catch diode connected between the SW pin and GND. The DA pin monitors the anode of this diode to prevent current runaway at high input voltages. Recommended devices include ON Semiconductor MBRA140T3 or Central Semiconductor CMMSH1-40, rated for ≥1A forward current and ≥40V reverse voltage.
How is the switching frequency programmed on the LT3592IMSE#PBF?
The switching frequency of the LT3592IMSE#PBF is programmed by connecting a resistor between the RT pin and GND. Standard values include 357kΩ for 400kHz, 140kΩ for 900kHz, and 48.7kΩ for 2.2MHz. The relationship is approximately linear across the 400kHz–2.2MHz range, and the RT pin voltage remains below 6V under all operating conditions.
Can the LT3592IMSE#PBF operate safely with input voltages above 24V?
Yes, the LT3592IMSE#PBF is rated for continuous operation from 3.6V to 36V input. It includes undervoltage lockout (UVLO) that disables operation below ~3.25V and withstands automotive load-dump transients up to 36V. At high VIN (e.g., >26V), minimum on-time limitations may cause pulse-skipping, increasing output ripple - but regulation and protection remain fully functional.
What is the purpose of the exposed pad on the LT3592IMSE#PBF MSOP package?
The exposed pad (Pin 11) on the LT3592IMSE#PBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour for both low-impedance grounding and effective heat dissipation. Thermal resistance is θJA = 38°C/W when properly mounted; omitting solder connection degrades thermal performance and risks thermal shutdown under load.
LT3592IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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-MSOP-EP
LT3592IMSE#PBF FAQ
1.How can I place an order for LT3592IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3592IMSE#PBF 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 LT3592IMSE#PBF reliable?
The price and inventory of LT3592IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3592IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3592IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3592IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3592IMSE#PBF?
LT3592IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3592IMSE#PBF 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 LT3592IMSE#PBF?
For technical support, including LT3592IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3592IMSE#PBF requirements.
6.How does Aetrix verify that LT3592IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3592IMSE#PBF 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 LT3592IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3592IMSE#PBF?
All LT3592IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3592IMSE#PBF, 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 LT3592IMSE#PBF part is unused and in its original packaging.
Return procedure for LT3592IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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