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Analog Devices Inc. LT3592EMSE#TRPBF
- Part No.:
- LT3592EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3592EMSE#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 50MA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,580
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Product details
Overview
LT3592EMSE#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 PWM dimming, operates from 3.6V to 36V input, integrates a 1.25A bipolar NPN switch, and supports programmable switching frequency from 400kHz to 2.2MHz via external RT resistor.
For engineers reviewing the LT3592EMSE#TRPBF datasheet, LT3592EMSE#TRPBF pinout, LT3592EMSE#TRPBF application, or LT3592EMSE#TRPBF equivalent, key selection criteria include its dual-current mode (50mA/500mA), shorted/open LED protection, DA-pin-based catch diode current sensing, thermal shutdown, and MSOP-10 package with exposed pad for thermal management.
Technical Context
The LT3592EMSE#TRPBF uses current-mode PWM control with cycle-by-cycle current limiting and internal slope compensation. Its error amplifier compares either a 200mV (bright) or 20mV (dim) sense voltage across an external CAP–OUT resistor against a 1.21V reference, enabling precise constant-current regulation independent of LED forward voltage variation.
It implements frequency foldback at low VOUT, minimum on-time limiting (~70ns), and DA-pin monitoring to throttle switching when catch diode current exceeds threshold-preventing runaway under high-VIN/low-duty-cycle conditions. The BOOST pin drives the internal bipolar switch via a charge-pump network using an internal Schottky and optional external diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports 12V/24V automotive battery systems with cold-crank margin down to 3.6V. |
| Output Current | 50mA or 500mA selectable via BRIGHT pin - enables dual-level brake/tail light intensity without external current-setting hardware change. |
| Switching Frequency | 400kHz–2.2MHz (RT-programmable) - allows optimization of inductor size, EMI profile, and efficiency across load conditions. |
| Current Sense Accuracy | ±3% typical at 500mA - ensures consistent LED brightness across temperature and unit-to-unit variation. |
| Dimming Ratio | 10:1 (BRIGHT pin logic-controlled) - meets automotive nighttime visibility requirements while preserving color consistency. |
| Thermal Protection | Internal thermal shutdown - disables switching above safe junction temperature, preventing damage during sustained overload or poor PCB heatsinking. |
| Package | 10-Lead MSOP with exposed pad - provides 38°C/W θJA and requires soldered GND pad for thermal and electrical integrity. |
Pinout & Package
LT3592EMSE#TRPBF is housed in a thermally enhanced 10-lead MSOP package (3mm × 3mm) with exposed pad (Pin 11) that must be soldered to PCB ground for thermal dissipation and electrical stability. θJA = 38°C/W, θJC = 8°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Oscillator frequency programming node | Connects to ground via resistor to set switching frequency (e.g., 140kΩ → 900kHz); determines inductor size and EMI behavior. |
| BRIGHT (2) | Dimming mode select input | Logic-high (>1.4V) enables 500mA mode; logic-low (<0.3V) enables 50mA mode; supports 150Hz PWM for analog-like dimming. |
| SHDN (3) | Shutdown control input | Pull low to disable switching and reduce quiescent current to <2μA; supports PWM dimming or system-level power gating. |
| VIN (4) | Main power input | Supplies internal bias and switch driver; requires local 1μF ceramic bypass; supports up to 36V continuous operation. |
| DA (5) | Catch diode anode monitor | Connects to Schottky diode anode to detect diode conduction; triggers frequency foldback if current exceeds threshold to prevent runaway. |
| SW (6) | Internal switch output | Drives external inductor; connects to cathode of catch diode; carries pulsed high-current waveform with ~70ns minimum on-time. |
| BOOST (7) | Charge-pump drive node | Provides >VIN voltage to saturate internal bipolar NPN switch; tied to SW via 0.1μF capacitor; external Schottky improves boost at low VOUT. |
| CAP (8) | Converter output / current sense top | Connects to inductor, output capacitor, and top of external sense resistor; serves as reference for current-sense amplifier. |
| OUT (9) | LED string anode / current sense bottom | Drives LED anode and connects to bottom of sense resistor; second input to current-sense amp; clamped by VFB loop during open-LED fault. |
| VFB (10) | Voltage feedback input | Connects to resistor divider between OUT and GND; sets maximum output voltage limit (e.g., 1.21V × (R1/R2 + 1)) to protect against open-circuit failure. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bipolar NPN switch | 1.25A current limit with 300mV VCE(SAT) at 500mA - eliminates need for external high-voltage MOSFET and gate driver in 36V automotive designs. |
| DA-pin current sensing | Direct monitoring of catch diode conduction - prevents output current runaway when VIN ≫ VOUT, eliminating reliance on duty-cycle estimation or external current monitors. |
| Shorted/open LED protection | Dual-fault detection via current-sense amplifier and VFB loop - shuts down or limits output during LED short (excessive current) or open (overvoltage) conditions. |
| Resistor-programmable frequency | Three standard RT values (357k/140k/48.7kΩ) set 400kHz/900kHz/2.2MHz - enables layout- and cost-optimized trade-offs between inductor size, efficiency, and EMI compliance. |
| Thermally enhanced MSOP-10 | Exposed pad with θJC = 8°C/W - allows direct thermal path to PCB copper, supporting 500mA continuous operation without heatsink in compact automotive modules. |
Applications
| Automotive Rear Lighting | Industrial Status Indicators |
|---|---|
Use Scenario: Dual-intensity rear combination lamp (brake/tail) in 12V/24V commercial vehicle with E-mark certification requirements. IC Role / Device Role / Timing Role: Constant-current LED driver with 10:1 dimming ratio, open/short LED fault detection, and thermal shutdown. Use Value: Eliminates discrete current-setting resistors and external fault logic; reduces BOM count by 4 components vs. op-amp + MOSFET solution. | Use Scenario: High-reliability panel-mounted status indicator in factory automation cabinet with wide-input industrial power supply. IC Role / Device Role / Timing Role: Robust LED driver immune to input transients and ambient temperature swings (−40°C to +125°C). Use Value: Maintains ±3% LED current accuracy over full temperature range without calibration; survives 40V load-dump pulses per ISO 7637-2. |
| Emergency Vehicle Signal Modules | Outdoor Signage Power Supplies |
Use Scenario: Flashing red/blue beacon module requiring rapid current transitions and high peak brightness in harsh environmental conditions. IC Role / Device Role / Timing Role: Fast transient-response current source with <50μs BRIGHT/DIM transition time and built-in frequency foldback. Use Value: Enables crisp flash timing without output overshoot; DA-pin sensing prevents current surge during high-VIN startup. | Use Scenario: Outdoor LED sign powered from unregulated solar-charged battery bank with voltage ranging from 10V–32V. IC Role / Device Role / Timing Role: Wide-input constant-current regulator with undervoltage lockout (3.6V) and overvoltage clamp (36V). Use Value: Operates continuously across full battery SOC without brownout or overvoltage shutdown; maintains stable LED luminance despite input sag. |
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 |
|---|---|---|---|
| LTC3783EFE#TRPBF | Higher 2A switch current, but requires external MOSFET; no integrated bipolar switch; wider 4.5V–60V input range. | Targeted at higher-power multi-string LED arrays; lacks native 10:1 dimming interface; needs external current-sense amp. | Select when >500mA output or >36V input is required; not drop-in due to topology and pinout differences. |
| MAX16820ATP+T | Fixed 1MHz frequency, 1.5A switch, but only 5.5V–40V input; no DA-pin sensing; simpler BRIGHT interface (single-resistor dimming). | Optimized for cost-sensitive interior lighting; lacks automotive-grade thermal performance (−40°C to +125°C not guaranteed). | Consider for non-automotive applications where 500mA/10:1 dimming suffices and thermal spec is relaxed. |
Compared with LTC3783EFE#TRPBF and MAX16820ATP+T, the LT3592EMSE#TRPBF uniquely integrates a bipolar switch with DA-pin current monitoring and factory-trimmed 10:1 dimming-enabling compact, robust, single-chip automotive signal lighting without external current mirrors or fault comparators.
Availability
LT3592EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive signal lighting, industrial status indicators, emergency vehicle beacons, and outdoor signage requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT3592EMSE#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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision, reliability, and ruggedness-critical applications.
The LT3592 product line was developed by Linear Technology (acquired by ADI in 2017) specifically for automotive-grade constant-current LED drivers-emphasizing fault resilience, wide input range, and integrated protection in compact packages.
FAQ
What is the maximum continuous LED current supported by the LT3592EMSE#TRPBF?
The LT3592EMSE#TRPBF supports a maximum continuous LED current of 500mA in bright mode, as confirmed by its electrical characteristics table and typical application circuits. This rating applies across the full −40°C to +125°C operating junction temperature range when used with proper PCB thermal design-including soldering the exposed pad to a thermal plane. Exceeding 500mA risks triggering the 1.25A switch current limit and entering foldback mode.
How does the DA pin function in the LT3592EMSE#TRPBF, and why is it critical for high-VIN operation?
The DA pin in the LT3592EMSE#TRPBF directly senses the anode current of the external catch diode. When this current exceeds an internal threshold-common during high-VIN/low-duty-cycle conditions-the device reduces switching frequency to prevent inductor current runaway. This function is critical because it avoids reliance on estimated duty cycle or external current monitors, ensuring stable 500mA regulation even at 32V input with 4V LED string, as validated in the Typical Performance Characteristics curves.
Can the LT3592EMSE#TRPBF be used with a single LED instead of two series LEDs?
Yes, the LT3592EMSE#TRPBF supports single-LED configurations. The datasheet explicitly recommends connecting an external Schottky diode between BOOST and CAP for single-LED applications to improve boost voltage generation. Output voltage headroom remains sufficient: with VFB = 1.21V and typical red LED VF ≈ 2.1V, the minimum required VOUT is ~3.3V-well within the LT3592EMSE#TRPBF's capability given its 36V absolute max input and internal 30V CAP/OUT rating.
What is the purpose of the exposed pad on the LT3592EMSE#TRPBF MSOP package, and how must it be handled in layout?
The exposed pad (Pin 11) on the LT3592EMSE#TRPBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB copper pour tied to system ground to achieve the specified θJA = 38°C/W and θJC = 8°C/W thermal resistance. Leaving it unconnected or floating degrades thermal performance by >40%, risks thermal shutdown at 500mA load, and may cause instability due to ground impedance modulation in the high-speed switching loop.
Does the LT3592EMSE#TRPBF require an external boost diode, or is the internal Schottky sufficient?
The LT3592EMSE#TRPBF includes an internal Schottky diode for the BOOST charge-pump circuit, making an external diode optional. However, the datasheet recommends adding an external fast Schottky (e.g., BAS40) between BOOST and CAP for single-LED applications or whenever higher BOOST voltage is needed to ensure full saturation of the internal bipolar NPN switch-particularly at low output voltages (<5V) where internal diode drop limits available gate drive.
LT3592EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT3592EMSE#TRPBF FAQ
1.How can I place an order for LT3592EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3592EMSE#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 LT3592EMSE#TRPBF reliable?
The price and inventory of LT3592EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3592EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3592EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3592EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3592EMSE#TRPBF?
LT3592EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3592EMSE#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 LT3592EMSE#TRPBF?
For technical support, including LT3592EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3592EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3592EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3592EMSE#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 LT3592EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3592EMSE#TRPBF?
All LT3592EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3592EMSE#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 LT3592EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3592EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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