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Analog Devices Inc. LT3481EMSE#TRPBF
- Part No.:
- LT3481EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3481EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,968
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Product details
Overview
LT3481EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 36V, 2A, 2.8MHz adjustable-frequency current-mode buck switching regulator with 50µA quiescent current in Burst Mode operation. It integrates a 0.18Ω NPN switch, boost Schottky diode, and power-good flag, and is used for automotive battery regulation and portable product power supplies.
For engineers reviewing the LT3481EMSE#TRPBF datasheet, LT3481EMSE#TRPBF pinout, LT3481EMSE#TRPBF application, or LT3481EMSE#TRPBF equivalent, key selection criteria include input voltage range (3.6V–34V), output voltage adjustability (1.265V–20V), soft-start capability via RUN/SS pin, and thermal performance in the 10-lead MSOP package with exposed pad.
Technical Context
The LT3481EMSE#TRPBF employs current-mode control for fast transient response and loop stability, with frequency programmable from 300kHz to 2.8MHz via an external RT resistor. Its internal bipolar NPN switch is driven by a BOOST pin voltage higher than VIN, enabling full saturation and low 360mV VCE(SAT) at 2A.
Burst Mode operation maintains high efficiency at light loads while limiting output ripple to <15mV; bias current can be drawn from VOUT when >3V to further improve light-load efficiency. The device includes integrated soft-start, power-good flag (90% VFB threshold), and VC pin-based loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 34V operating; 36V absolute maximum - supports wide-range industrial and automotive inputs. |
| Max Output Current | 2A continuous - sufficient for powering microcontrollers, FPGAs, and sensor subsystems. |
| Switching Frequency | Adjustable 300kHz–2.8MHz via RT pin - enables optimization of inductor size vs. efficiency. |
| Quiescent Current | 50µA in Burst Mode at 12VIN/3.3VOUT - extends battery life in always-on portable systems. |
| Feedback Reference | 1.265V ±1.2% - sets precise output voltage with standard resistor divider networks. |
| Power Good Flag | Open-collector PG pin asserts when VOUT reaches 90% of programmed value - enables system sequencing and fault monitoring. |
| Thermal Package | 10-lead MSOP with exposed pad (θJA = 40°C/W) - provides low thermal resistance for sustained 2A operation. |
Pinout & Package
LT3481EMSE#TRPBF is housed in a 10-lead plastic MSOP package with exposed pad (Pin 11), which must be soldered to PCB ground for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Boost diode anode connection | Connects to external Schottky diode anode; forms charge pump for BOOST drive voltage. |
| BOOST (Pin 2) | Internal switch driver supply | Provides >VIN voltage to fully saturate NPN switch; max 56V rating limits external capacitor selection. |
| SW (Pin 3) | Switch node | Drives inductor and catch diode; carries high di/dt; requires tight layout with low-inductance path to GND. |
| VIN (Pin 4) | Main power input | Supplies internal regulator and switch; must be locally bypassed with ≥4.7µF ceramic capacitor. |
| RUN/SS (Pin 5) | Enable & soft-start control | Pull ≥2.5V to enable; apply RC ramp for controlled VOUT rise; sinks <1µA in shutdown. |
| PG (Pin 6) | Power good indicator | Open-collector output; pulled high externally; asserts when FB reaches 90% of 1.265V reference. |
| BIAS (Pin 7) | Efficiency-optimized bias supply | Draws current from VOUT (>3V) instead of VIN to reduce losses in high VIN/VOUT ratios. |
| FB (Pin 8) | Feedback input | Regulated to 1.265V; connects to resistor divider tap; bias current flows into pin (30–100nA). |
| VC (Pin 9) | Error amplifier output | Controls peak switch current; requires RC compensation network to ground for stable loop response. |
| RT (Pin 10) | Oscillator frequency set | Resistor-to-ground sets switching frequency (e.g., 8.66kΩ → 2.8MHz); tolerance affects accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Diode | Eliminates need for external bootstrap diode; reduces BOM count and layout complexity in compact designs. |
| Low-Ripple Burst Mode | Maintains <15mV output ripple at light loads while achieving 50µA IQ, critical for battery-powered IoT nodes. |
| Saturating Switch Design | 0.18Ω on-resistance and 360mV VCE(SAT) at 2A enable high efficiency across load range without external MOSFET. |
| Power Good Flag | Enables reliable power sequencing in multi-rail systems; valid only when VIN > 3.5V and RUN/SS is high. |
| Soft-Start via RUN/SS | RC-controlled voltage ramp on RUN/SS pin prevents inrush current and output overshoot during startup. |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery to 3.3V/5V for infotainment ECUs and ADAS sensors. IC Role / Device Role / Timing Role: Primary buck converter delivering stable, low-noise power under wide input transients (load dump, cold crank). Use Value: 36V abs max rating and –40°C to +85°C operating range ensure reliability in harsh automotive environments. | Use Scenario: Powering handheld medical devices or industrial handhelds with Li-ion batteries (3.0–4.2V) and extended runtime requirements. IC Role / Device Role / Timing Role: Main DC/DC converter supplying processor core and peripherals with adaptive light-load efficiency. Use Value: 50µA Burst Mode IQ and BIAS pin operation from VOUT maximize battery life without sacrificing startup speed. |
| Distributed Supply Regulation | Industrial Supplies |
Use Scenario: Local point-of-load conversion in PLC backplanes or modular I/O systems with 24V rail. IC Role / Device Role / Timing Role: Secondary regulator generating isolated 5V or 12V rails from shared 24V bus with minimal board space. Use Value: 2.8MHz max switching frequency allows use of sub-5mm inductors, reducing footprint and EMI filter size. | Use Scenario: Powering field instruments and process controllers requiring robust operation across wide temperature and input ranges. IC Role / Device Role / Timing Role: Primary step-down regulator handling unregulated 18–36V industrial inputs with high reliability. Use Value: Exposed-pad MSOP package and 125°C junction rating support convection-cooled enclosures without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#TRPBF | 40V input, 1.5A, 3.5MHz, no integrated boost diode; requires external bootstrap circuit. | Higher frequency enables smaller magnetics but lacks integrated BD pin; lower current limit. | Choose when board space is constrained and external diode layout is acceptable. |
| MP2451DT-LF-Z | 36V input, 0.6A, 2MHz, no PG flag or BIAS pin; uses external MOSFETs; 1.215V reference. | Lower current rating and missing features limit use to auxiliary rails or non-critical loads. | Choose only for cost-sensitive, low-power auxiliary supplies where PG and efficiency are secondary. |
Compared with LTC3631EMSE#TRPBF and MP2451DT-LF-Z, the LT3481EMSE#TRPBF delivers higher output current (2A), integrated boost diode, power-good signaling, and BIAS pin efficiency enhancement - making it uniquely suited for primary power rails in demanding industrial and automotive applications.
Availability
LT3481EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, and distributed supply regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3481EMSE#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio.
The LT3481 product line was designed for wide-input, high-efficiency buck conversion in automotive, industrial, and portable systems where reliability, low quiescent current, and integrated functionality are essential.
FAQ
What is the maximum input voltage rating for LT3481EMSE#TRPBF?
The LT3481EMSE#TRPBF has an absolute maximum VIN rating of 36V. Continuous operation is rated up to 34V; transient inputs up to 36V are acceptable only when the output is in regulation and no startup or short-circuit conditions occur. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
Does LT3481EMSE#TRPBF require an external boost diode?
No, the LT3481EMSE#TRPBF integrates the boost Schottky diode function internally. Pin BD (Pin 1) connects directly to the anode of the internal diode; only an external boost capacitor is required between BOOST and SW pins. This eliminates one external component and simplifies layout.
How does the BIAS pin improve efficiency in LT3481EMSE#TRPBF?
The BIAS pin on LT3481EMSE#TRPBF allows the IC to draw bias current from VOUT (when >3V) instead of VIN, reducing power loss in high VIN/VOUT step-down applications. This architecture lowers total power dissipation and improves light-load efficiency beyond what's achievable with VIN-only biasing.
What is the purpose of the VC pin on LT3481EMSE#TRPBF?
VC is the error amplifier output pin on LT3481EMSE#TRPBF. It controls peak switch current and must be compensated with an external RC network to ground. Proper VC compensation ensures loop stability, transient response, and avoids subharmonic oscillation-especially critical at duty cycles >50%.
Can LT3481EMSE#TRPBF operate in forced continuous conduction mode (CCM)?
No, LT3481EMSE#TRPBF does not support forced CCM. It operates in current-mode PWM with automatic transition to low-ripple Burst Mode at light loads. There is no pin or register to disable Burst Mode; this behavior is inherent to the control architecture and ensures minimum 50µA quiescent current.
LT3481EMSE#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
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 34V
- Voltage - Output (Min/Fixed):
- 1.265V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 2A
- Frequency - Switching:
- 300kHz ~ 2.8MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3481EMSE#TRPBF FAQ
1.How can I place an order for LT3481EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3481EMSE#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 LT3481EMSE#TRPBF reliable?
The price and inventory of LT3481EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3481EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3481EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3481EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3481EMSE#TRPBF?
LT3481EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3481EMSE#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 LT3481EMSE#TRPBF?
For technical support, including LT3481EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3481EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3481EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3481EMSE#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 LT3481EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3481EMSE#TRPBF?
All LT3481EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3481EMSE#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 LT3481EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3481EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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