My Inquiry
My Account
Analog Devices Inc. LT3592IMSE#TRPBF
- Part No.:
- LT3592IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3592IMSE#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR 50MA/ 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,570
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3592IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a fixed-frequency, current-mode step-down DC/DC LED driver IC designed for constant-current operation in automotive signal lighting and industrial LED applications. It delivers up to 500mA output current, supports 3.6V–36V input voltage range, features 10:1 analog/digital dimming via BRIGHT pin, and integrates internal switch with 1.25A current limit. Its primary circuit role is regulating LED string current while providing open/short LED fault protection.
For engineers reviewing the LT3592IMSE#TRPBF datasheet, LT3592IMSE#TRPBF pinout, LT3592IMSE#TRPBF application, or LT3592IMSE#TRPBF equivalent, key selection considerations include its 10-lead MSOP package thermal performance (θJA = 38°C/W), resistor-programmable switching frequency (400kHz–2.2MHz), dual current modes (50mA/500mA), catch diode current sensing on DA pin, and integrated overtemperature/UVLO protection.
Technical Context
The LT3592IMSE#TRPBF implements a current-mode PWM architecture with cycle-by-cycle current limiting and fast transient response. Its control loop uses dual feedback paths: one from an instrumentation amplifier measuring CAP–OUT voltage drop across an external sense resistor (gain = 60 for DIM, 6 for BRIGHT), and another from a VFB-based voltage clamp set by an external resistor divider.
It incorporates frequency foldback during low-VOUT conditions, active soft-start via SHDN ramping, and DA-pin-based catch diode current monitoring to prevent runaway at high VIN/low duty cycle. The BOOST pin drives the internal bipolar NPN switch using a charge-pump network formed by an internal Schottky diode and external 0.1μF capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - enables direct connection to automotive battery (12V/24V systems) without pre-regulation. |
| Max Output Current | 500mA - supports high-brightness red LED strings (e.g., two Luxeon K2 LEDs) with stable regulation. |
| Dimming Ratio | 10:1 - achieved via BRIGHT pin logic-level control (≥1.4V = full, ≤0.3V = dim), enabling brake/tail light intensity differentiation. |
| Switching Frequency | 400kHz–2.2MHz - set by RT-to-GND resistor; higher frequencies allow smaller inductors (e.g., 4.7μH @ 2.2MHz) and reduced EMI. |
| Current Sense Accuracy | 200mV (BRIGHT) / 20mV (DIM) - precise CAP–OUT differential reference ensures ±3% LED current tolerance over temperature. |
| Package Thermal Resistance | θJA = 38°C/W - MSOP-10 exposed-pad construction provides superior heat dissipation vs DFN for sustained 500mA operation. |
| Protection Features | Shorted/OPEN LED detection, thermal shutdown, UVLO (3.25V), and DA-pin current runaway prevention - eliminates need for external fault monitoring circuitry. |
Pinout & Package
LT3592IMSE#TRPBF is housed in a thermally enhanced 10-lead plastic MSOP package (3mm × 3mm) with exposed pad (Pin 11) soldered to PCB ground for electrical and thermal integrity. θJA = 38°C/W and θJC = 8°C/W support industrial and automotive ambient temperatures up to 125°C junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator frequency programming node | Resistor-to-GND sets switching frequency (e.g., 140kΩ = 900kHz); enables optimization of size vs efficiency trade-offs. |
| BRIGHT (Pin 2) | LED current mode select | Logic-level input controlling 10:1 dimming ratio; compatible with microcontroller GPIO or PWM signals up to 150Hz. |
| SHDN (Pin 3) | Regulator enable/disable control | Active-high shutdown reduces quiescent current to 2μA; supports system-level power sequencing and brightness modulation. |
| VIN (Pin 4) | Main power input | Supplies internal bias and switch driver; requires local 1μF ceramic bypass to handle high di/dt ripple current. |
| DA (Pin 5) | Catch diode anode sense | Monitors external Schottky diode current to prevent runaway during high-VIN/low-duty-cycle operation; improves reliability in 24V+ systems. |
| SW (Pin 6) | Internal switch drain node | Connects to inductor and cathode of catch diode; carries pulsed high-current waveform requiring low-inductance layout. |
| BOOST (Pin 7) | Charge-pump drive for NPN switch | Connected to SW via 0.1μF capacitor; generates >VIN voltage to saturate internal bipolar transistor for low VCESAT (~300mV @ 500mA). |
| CAP (Pin 8) | Converter output & current sense reference | Node connecting inductor, output capacitor, and top of LED sense resistor; serves as high-side current sense input to instrumentation amp. |
| OUT (Pin 9) | LED string anode drive | Drives LED load and forms second current sense terminal; connects to bottom of sense resistor and top of VFB divider. |
| VFB (Pin 10) | Voltage feedback input | 1.21V reference input for output voltage clamping; used to set maximum VOUT (e.g., open-LED protection) via R1/R2 divider. |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmable frequency | Enables layout optimization: 400kHz allows larger inductors for lower ripple; 2.2MHz permits ultra-compact 4.7μH magnetics in space-constrained modules. |
| Dual current modes (50mA/500mA) | Supports functional safety requirements: 50mA tail light mode and 500mA brake light mode on same hardware without component change. |
| Integrated DA-pin current sensing | Prevents LED current overshoot when VIN exceeds 24V by dynamically reducing switching frequency-critical for 24V truck/bus lighting compliance. |
| Thermally enhanced MSOP-10 | Exposed pad + low θJA (38°C/W) sustains 500mA continuous output at 85°C ambient without heatsink-reducing BOM count vs DFN alternatives. |
| Open/short LED fault protection | Automatically disables switching and pulls OUT low on LED string failure-eliminates need for external comparators or microcontroller supervision. |
Applications
| Automotive Rear Lighting | Industrial Status Indicators |
|---|---|
Use Scenario: Dual-intensity rear lamp module for passenger vehicles meeting SAE J585 and ECE R7 standards. IC Role / Device Role / Timing Role: Constant-current LED driver with 10:1 dimming, open-circuit detection, and 36V load-dump survivability. Use Value: Enables single-PCB design for brake (500mA) and tail (50mA) functions; DA-pin sensing prevents thermal runaway during cold-crank (24V+ transients). | Use Scenario: High-reliability panel-mounted status indicator in factory automation HMIs. IC Role / Device Role / Timing Role: Regulated current source driving parallel red LED strings in harsh industrial environments. Use Value: Wide 3.6V–36V input accommodates 24V DC plant power with brownout margin; thermal shutdown protects against enclosure overheating. |
| Commercial Vehicle Signal Lighting | Outdoor Advertising Displays |
Use Scenario: Brake/tail light assembly for Class 8 trucks subjected to 12V/24V dual-battery systems and ISO 16750-2 pulse testing. IC Role / Device Role / Timing Role: Robust LED driver with shorted-LED protection and 125°C operating junction rating. Use Value: MSOP-10 package withstands vibration and thermal cycling; 36V absolute max rating handles 32V load-dump pulses without external TVS. | Use Scenario: Outdoor digital signage using high-brightness red LED arrays powered from unregulated solar/battery systems. IC Role / Device Role / Timing Role: Efficient step-down current regulator supporting variable input (15–30V) and ambient temperature extremes. Use Value: 900kHz operation with 4.7μH inductor minimizes size/weight; frequency foldback maintains regulation during low-VOUT startup. |
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#TRPBF | 4-channel, I²C-programmable LED driver; supports 150mA/channel, 60V max VIN, no DA-pin sensing. | Targeted at multi-zone RGBW displays; lacks single-channel 500mA capability and automotive dimming simplicity. | Select LT3965IMSE#TRPBF only when digital addressability and channel independence outweigh need for high single-string current. |
| LM3409QMY/NOPB | Adjustable-frequency buck LED controller (external MOSFET); 1.25A peak switch current; no integrated current sense amp or DA pin. | Requires external sense resistor, gate driver, and Schottky diode; suited for >1A designs where thermal management justifies discrete layout. | Choose LM3409QMY/NOPB when output current exceeds 500mA or when board space allows discrete FET + diode solution. |
Compared with LT3592IMSE#TRPBF, LT3965IMSE#TRPBF offers digital control but sacrifices single-channel current capability and automotive-grade dimming integration, while LM3409QMY/NOPB provides higher current headroom at the cost of increased component count, layout complexity, and missing DA-pin runaway protection.
Availability
LT3592IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive signal lighting, industrial status indicators, and outdoor LED signage requiring stable component supply, extended temperature operation (–40°C to 125°C), and AEC-Q200-aligned reliability.
Supply support for LT3592IMSE#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, automotive, and industrial markets.
The LT3592 product line was designed specifically for robust, high-current LED driving in automotive exterior lighting and industrial signaling applications, emphasizing integrated protection, wide input range, and simplified thermal management in compact packages.
FAQ
What is the maximum continuous output current supported by the LT3592IMSE#TRPBF?
The LT3592IMSE#TRPBF supports a maximum continuous LED output current of 500mA in BRIGHT mode, set by the external sense resistor value and the 200mV current sense threshold. This rating is validated across the full –40°C to 125°C operating junction temperature range and assumes proper PCB thermal design with the exposed pad soldered to a minimum 100mm² copper area.
How does the DA pin on the LT3592IMSE#TRPBF improve system reliability?
The DA pin on the LT3592IMSE#TRPBF senses current through the external catch diode to prevent LED current runaway under high-input-voltage, low-duty-cycle conditions-common during cold-crank or load-dump events in automotive applications. When DA-pin current exceeds the internal threshold, the LT3592IMSE#TRPBF reduces switching frequency to maintain safe peak inductor current, avoiding thermal stress and potential LED damage.
Can the LT3592IMSE#TRPBF operate with a single red LED instead of two in series?
Yes, the LT3592IMSE#TRPBF can drive a single red LED by connecting the BOOST pin to CAP via an external Schottky diode (e.g., BAS40) to boost the gate drive voltage, ensuring full saturation of the internal bipolar switch at low VOUT. The VFB loop must still be configured to clamp output voltage above the LED's forward voltage (e.g., ≥3.5V) to maintain current regulation integrity.
What is the purpose of the RT pin on the LT3592IMSE#TRPBF, and how is it configured?
The RT pin on the LT3592IMSE#TRPBF programs the internal oscillator frequency via a resistor to ground. Standard values include 140kΩ for 900kHz (optimized for 4.7μH inductors), 357kΩ for 400kHz (for lower EMI), and 48.7kΩ for 2.2MHz (for minimal magnetics size). The resistor must be placed within 2mm of the RT pin with short traces to minimize noise coupling into the timing circuit.
Does the LT3592IMSE#TRPBF require an external Schottky diode, and if so, what specifications are critical?
Yes, the LT3592IMSE#TRPBF requires an external Schottky catch diode (D1) rated for ≥1A average forward current and ≥36V reverse voltage (e.g., ON Semiconductor MBRA140T3). Critical specs include low forward voltage (<0.45V @ 500mA) to minimize power loss, and fast recovery (<10ns) to reduce switching losses. The diode anode must connect to the DA pin to enable runaway protection.
LT3592IMSE#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
LT3592IMSE#TRPBF FAQ
1.How can I place an order for LT3592IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3592IMSE#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 LT3592IMSE#TRPBF reliable?
The price and inventory of LT3592IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3592IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3592IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3592IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3592IMSE#TRPBF?
LT3592IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3592IMSE#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 LT3592IMSE#TRPBF?
For technical support, including LT3592IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3592IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3592IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3592IMSE#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 LT3592IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3592IMSE#TRPBF?
All LT3592IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3592IMSE#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 LT3592IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3592IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3592IMSE#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…
