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Analog Devices Inc. LT3592EMSE#PBF
- Part No.:
- LT3592EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3592EMSE#PBF.pdf
- Description:
- IC LED DRIVER RGLTR 50MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:416
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Product details
Overview
LT3592EMSE#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 and industrial LED arrays. It delivers up to 500mA output current with 10:1 analog/PWM dimming, operates from 3.6V to 36V input, integrates a 1.25A bipolar NPN switch, and uses external sense resistor feedback for precise current regulation. Its primary role is driving 1–2 high-brightness red LEDs in brake/tail light modules.
For engineers reviewing the LT3592EMSE#PBF datasheet, LT3592EMSE#PBF pinout, LT3592EMSE#PBF application, or LT3592EMSE#PBF equivalent, key selection criteria include its 400kHz–2.2MHz programmable switching frequency, dual 50mA/500mA current settings via BRIGHT pin logic, shorted/open LED fault protection, thermally enhanced MSOP-10 package, and automotive-grade –40°C to 125°C operation.
Technical Context
The LT3592EMSE#PBF implements a current-mode PWM architecture with cycle-by-cycle current limiting and internal slope compensation. Its error amplifier compares either the amplified CAP–OUT voltage (for current control) or the VFB divider voltage (for overvoltage protection), selecting the dominant loop based on relative magnitude - enabling robust LED current regulation while safeguarding against open-circuit failures.
It features active DA-pin sensing of catch diode anode current to prevent runaway at high VIN/low duty cycle, frequency foldback during low-VOUT conditions, and a dedicated BOOST pin driven by an internal Schottky and external 0.1μF capacitor to fully saturate the bipolar power switch. Thermal shutdown and undervoltage lockout (3.25V threshold) provide system-level protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports 12V/24V automotive systems and wide-input industrial rails without external pre-regulation. |
| Max Output Current | 500mA - set by external sense resistor; 10% dimmed mode delivers 50mA for nighttime brake lighting compliance. |
| Switching Frequency | 400kHz to 2.2MHz - programmed via RT-to-GND resistor; higher frequencies enable smaller 2.2MHz-optimized inductors (e.g., 4.7μH). |
| Integrated Switch | 1.25A bipolar NPN - low 300mV VCE(SAT) at 500mA enables high efficiency in high-current LED strings. |
| Current Sense Accuracy | ±5% typical - achieved via 60× (BRIGHT low) or 6× (BRIGHT high) instrumentation amplifier gain across external RSENSE. |
| Package | 10-Lead MSOP - thermally enhanced with exposed pad soldered to PCB; θJA = 38°C/W enables compact layout in space-constrained lighting modules. |
| Operating Temp | –40°C to 125°C - specified and guaranteed for automotive under-hood and exterior lighting environments. |
Pinout & Package
LT3592EMSE#PBF is housed in a 10-lead plastic MSOP package with exposed thermal pad (Pin 11 = GND). The package measures 3mm × 3mm × 1.1mm and requires soldering of the exposed pad for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Oscillator frequency programming node | Resistor to GND sets switching frequency (e.g., 140kΩ → 900kHz); determines inductor size and EMI profile. |
| BRIGHT (2) | Dimming mode select input | Voltage >1.4V enables 500mA mode; <0.3V enables 50mA mode; supports 150Hz PWM for smooth brightness transitions. |
| SHDN (3) | Shutdown control input | Logic-high (>2.3V) enables operation; logic-low (<0.3V) reduces quiescent current to 2μA and disconnects output. |
| VIN (4) | Main power input | Supplies internal bias and switch driver; requires local 1μF ceramic bypass; supports hot-plug with pi-filter for automotive EMC. |
| DA (5) | Catch diode anode sense | Direct connection to Schottky diode anode prevents current runaway at high VIN/low duty cycle via frequency foldback. |
| SW (6) | Internal switch output | Drives external inductor and diode cathode; high dv/dt node requiring tight layout and ground plane coupling. |
| BOOST (7) | Boost capacitor drive | Charges external 0.1μF capacitor to ~VIN + 2.5V; enables full saturation of internal bipolar switch for low conduction loss. |
| CAP (8) | Converter output & current sense reference | Connects to inductor, output capacitor, and top of RSENSE; forms one side of current-sense differential pair. |
| OUT (9) | LED string anode drive | Connects to top LED anode and bottom of RSENSE; second input to current-sense amplifier; clamped by VFB loop if LED opens. |
| VFB (10) | Voltage feedback input | Resistor divider from OUT to GND sets max output voltage (VOUT = 1.21V × (R1+R2)/R2); protects against open-LED overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 10:1 analog/PWM dimming ratio | Enables compliance with SAE J1393 nighttime brake light intensity requirements using single BRIGHT pin control. |
| Shorted and open LED protection | DA-pin sensing and VFB overvoltage clamp ensure fail-safe operation without external monitoring circuitry. |
| Programmable 400kHz–2.2MHz switching | Allows optimization of inductor size, efficiency, and EMI filtering - e.g., 2.2MHz enables 4.7μH inductors and minimal board area. |
| Thermally enhanced MSOP-10 | θJA = 38°C/W enables 500mA continuous operation in compact automotive lighting housings without forced air. |
| Catch diode current runaway prevention | DA-pin sensing triggers frequency foldback before inductor current exceeds 1.2A, eliminating need for external current-limiting ICs. |
Applications
| Automotive Brake Lights | Industrial Status Indicators |
|---|---|
Use Scenario: Dual-intensity rear lighting module for passenger vehicles meeting SAE J1393 daytime/nighttime luminance requirements. IC Role / Device Role / Timing Role: Constant-current LED driver with 500mA/50mA dual-mode output controlled by vehicle CAN bus signal routed to BRIGHT pin. Use Value: Eliminates need for separate dimming MOSFETs or microcontroller-based PWM; achieves <50μs transition between modes for responsive brake indication. |
Use Scenario: High-reliability panel-mounted status indicator in factory automation PLC cabinets operating from 24V DC rails. IC Role / Device Role / Timing Role: Primary LED current regulator with open-LED fault detection and thermal shutdown, interfacing directly to 24V supply and discrete I/O signals. Use Value: Reduces BOM count by integrating current sense, overvoltage clamp, and protection logic - no external op-amps or comparators required. |
| Commercial Vehicle Tail Lights | Outdoor Signage Modules |
Use Scenario: Heavy-duty truck tail lamp assembly exposed to wide ambient temperatures (–40°C to 85°C) and vibration. IC Role / Device Role / Timing Role: Robust LED driver with guaranteed –40°C to 125°C operation, DA-pin protection against battery surge-induced runaway, and MSOP thermal pad for chassis heat sinking. Use Value: Maintains stable 500mA output across temperature extremes without derating; eliminates field failures from thermal drift or cold-start current spikes. |
Use Scenario: Energy-efficient channel letter signage powered from 12V/24V solar-charged batteries in remote locations. IC Role / Device Role / Timing Role: High-efficiency step-down LED driver with 95% peak efficiency at 900kHz, low 2μA shutdown current, and programmable frequency to match battery voltage sag profiles. Use Value: Extends battery runtime by minimizing quiescent loss and optimizing switching losses across varying input voltage (10V–32V). |
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 |
|---|---|---|---|
| LT3965EMSE#PBF | 4-channel, 500mA/channel, I²C-programmable, integrated PWM generator; larger 16-MSOP package. | Designed for multi-string RGB or matrix lighting where independent per-channel dimming is required. | Select when scalable multi-channel control outweighs cost and board area penalties of single-channel LT3592EMSE#PBF. |
| LM3409QMY/NOPB | Adjustable 1.25A switch current, 100kHz–1MHz frequency range, no integrated boost circuit; requires external bootstrap diode. | Targets high-power single-string applications (e.g., 10W+ LEDs) where higher current headroom and lower cost are prioritized over integrated protection. | Select when >500mA output or lower BOM cost justifies added design complexity and absence of DA-pin runaway protection. |
Compared with LT3592EMSE#PBF, LT3965EMSE#PBF adds digital control and channel scalability at the expense of single-function simplicity and smaller footprint, while LM3409QMY/NOPB trades integrated protection and thermal performance for raw current capability and cost - making LT3592EMSE#PBF optimal for cost-sensitive, safety-critical dual-intensity automotive lighting.
Availability
LT3592EMSE#PBF is available at Aetrix Electronics and suitable for automotive signal lighting, industrial status indicators, and outdoor signage modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3592EMSE#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 automotive, industrial, communications, and healthcare markets.
The LT3592 product line was designed specifically for automotive-grade constant-current LED drivers with integrated protection, targeting brake, tail, and signal lighting where reliability, dimming precision, and thermal robustness are critical.
FAQ
What is the maximum LED string voltage supported by the LT3592EMSE#PBF?
The LT3592EMSE#PBF does not specify a fixed maximum LED string voltage. Instead, its output voltage is limited by the VFB loop: when configured with a resistor divider, it clamps VOUT to 1.21V × (R1+R2)/R2. For safe open-LED protection, this clamp voltage must exceed the maximum expected LED forward voltage by ≥10%. Typical designs support up to 30V output with appropriate R1/R2 selection, constrained only by the 30V absolute maximum rating on CAP and OUT pins.
Can the LT3592EMSE#PBF drive more than two series LEDs?
Yes, the LT3592EMSE#PBF can drive more than two series LEDs provided the total forward voltage remains within the device's output voltage capability and the VFB overvoltage clamp is properly configured. Its 30V absolute maximum on CAP/OUT pins and ability to regulate up to ~28V output (with appropriate inductor and diode ratings) support strings of 6–8 red LEDs or 3–4 white LEDs. However, efficiency and thermal performance must be validated per application, as higher VOUT reduces duty cycle and increases switching losses.
How does the DA pin prevent current runaway in the LT3592EMSE#PBF?
The DA pin in the LT3592EMSE#PBF connects directly to the anode of the external catch diode. When diode current exceeds an internal threshold, the LT3592EMSE#PBF initiates frequency foldback - reducing switching frequency to extend minimum on-time and limit peak inductor current. This prevents uncontrolled current rise during high-VIN, low-duty-cycle conditions (e.g., 24V input driving 5V LED string), eliminating the need for external current-limiting circuitry and enhancing system reliability.
What is the recommended output capacitor value for a 900kHz LT3592EMSE#PBF design?
For a 900kHz LT3592EMSE#PBF design, the recommended minimum output capacitor is 4.7μF. This value ensures stable regulation, acceptable transient response during BRIGHT/DIM transitions (<50μs), and low output ripple. Ceramic X7R or X5R dielectrics are preferred for their low ESR and stable capacitance over temperature and voltage. Larger values (e.g., 10μF) further reduce ripple and improve load-step response but are not required for basic functionality.
Does the LT3592EMSE#PBF require an external boost diode?
No, the LT3592EMSE#PBF does not require an external boost diode for standard operation. It integrates an internal Schottky diode between CAP and BOOST pins to charge the external 0.1μF boost capacitor. An external Schottky (e.g., BAS40) is optional and only recommended for single-LED applications or when higher BOOST voltage is needed to improve switch saturation at very low output voltages - adding marginal efficiency gain at the cost of extra component count.
LT3592EMSE#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
LT3592EMSE#PBF FAQ
1.How can I place an order for LT3592EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3592EMSE#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 LT3592EMSE#PBF reliable?
The price and inventory of LT3592EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3592EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3592EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3592EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3592EMSE#PBF?
LT3592EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3592EMSE#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 LT3592EMSE#PBF?
For technical support, including LT3592EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3592EMSE#PBF requirements.
6.How does Aetrix verify that LT3592EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3592EMSE#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 LT3592EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3592EMSE#PBF?
All LT3592EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3592EMSE#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 LT3592EMSE#PBF part is unused and in its original packaging.
Return procedure for LT3592EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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