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Analog Devices Inc. LT3481IMSE#PBF
- Part No.:
- LT3481IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3481IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:512
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Product details
Overview
LT3481IMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic 36V, 2A synchronous step-down switching regulator with current-mode control, adjustable 300kHz–2.8MHz switching frequency, 50µA quiescent current in Burst Mode, and integrated boost Schottky diode. It delivers regulated 3.3V/2A output from 4.5V–34V input in automotive battery regulation and portable power applications.
For engineers reviewing the LT3481IMSE#PBF datasheet, LT3481IMSE#PBF pinout, LT3481IMSE#PBF application, or LT3481IMSE#PBF equivalent, key selection criteria include its 0.18Ω switch RDS(on), 1.265V feedback reference, power good flag, soft-start via RUN/SS pin, and thermal performance in the 10-lead MSOP package with exposed pad.
Technical Context
The LT3481IMSE#PBF implements constant-frequency current-mode PWM control with internal oscillator set by RT resistor, enabling precise duty-cycle adjustment and fast transient response. Its bipolar NPN power switch is driven via BOOST pin with external capacitor-diode network to ensure full saturation at high input voltages.
Burst Mode operation reduces quiescent current to 50µA while maintaining output ripple below 15mV; bias current can be drawn from VOUT (>3V) to further improve light-load efficiency. The VC pin provides error amplifier output for loop compensation, and PG flag asserts when FB reaches 90% of 1.265V reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 34V operating; 36V absolute max - supports wide-range industrial and automotive supplies. |
| Output Current | 2A continuous - sufficient for powering microcontrollers, FPGAs, and sensor subsystems. |
| Switching Frequency | 300kHz to 2.8MHz (RT-programmable) - enables optimization of inductor size vs. efficiency. |
| Quiescent Current | 50µA at 12VIN/3.3VOUT in Burst Mode - extends battery life in always-on portable devices. |
| Feedback Reference | 1.265V ±1.2% - sets output voltage range from 1.265V to 20V using external resistor divider. |
| Power Good Flag | Open-collector PG output active low - signals valid regulation at 90% of target VOUT. |
| Thermal Rating | –40°C to +125°C junction - qualified for extended-temperature industrial and automotive under-hood use. |
Pinout & Package
LT3481IMSE#PBF is housed in a thermally enhanced 10-lead plastic MSOP package with exposed pad (Pin 11) soldered to PCB ground for low θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Boost diode anode connection | Connects to Schottky diode anode; forms charge pump for BOOST drive voltage. |
| BOOST (Pin 2) | Internal switch driver supply | Provides >VIN voltage to fully saturate bipolar NPN switch; max 56V rating. |
| SW (Pin 3) | Switch node | Drives external inductor and catch diode; carries high di/dt pulsed current. |
| VIN (Pin 4) | Main power input | Supplies internal regulator and switch; bypass locally with ≥4.7µF ceramic capacitor. |
| RUN/SS (Pin 5) | Enable & soft-start control | Logic-level shutdown (<0.2V); ramp voltage here controls output voltage slew rate. |
| PG (Pin 6) | Power good indicator | Open-collector output; pulled high externally when VOUT reaches 90% of regulation. |
| BIAS (Pin 7) | Efficiency-optimized bias source | Draws internal regulator current from VOUT (>3V) to reduce VIN current and improve light-load efficiency. |
| FB (Pin 8) | Feedback input | Regulated to 1.265V; connects to resistor divider tap for output voltage programming. |
| VC (Pin 9) | Error amplifier output | Controls peak switch current; RC network to ground sets loop compensation. |
| RT (Pin 10) | Oscillator frequency set | Resistor to ground programs switching frequency from 300kHz to 2.8MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external diode, reducing BOM count and board area in compact 3.3V/2A designs. |
| Low-Ripple Burst Mode Operation | Maintains <15mV output ripple at light loads while achieving 50µA IQ, critical for battery-powered systems. |
| Saturating Switch Design | 0.18Ω on-resistance ensures minimal conduction loss at 2A, supporting high-efficiency operation up to 34V input. |
| Power Good Flag with Hysteresis | 122mV threshold offset and 5mV hysteresis provide reliable system power sequencing and fault detection. |
| Soft-Start via RUN/SS Pin | External RC network on RUN/SS enables controlled output voltage ramp, preventing inrush current and overshoot. |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 3.3V for infotainment MCU and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck converter delivering clean, sequenced power with PG confirmation for safety-critical boot. Use Value: Withstands load dump transients up to 36V and operates reliably from –40°C to +125°C ambient. | Use Scenario: Powering handheld medical monitors requiring long runtime from single-cell Li-ion (3.0–4.2V) or dual-cell packs. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with ultra-low IQ to extend battery life during sleep modes. Use Value: 50µA quiescent current and BIAS pin operation from VOUT minimize standby drain without external LDO. |
| Distributed Supply Regulation | Industrial Sensor Node Power |
Use Scenario: Local 5V-to-3.3V conversion on modular PLC I/O cards with varying input rail tolerances. IC Role / Device Role / Timing Role: Point-of-load regulator providing isolated, ripple-controlled supply for ADCs and precision analog front-ends. Use Value: Adjustable frequency avoids noise coupling into sensitive measurement circuits; PG flag enables system-level health monitoring. | Use Scenario: Powering wireless sensor nodes (BLE/Zigbee SoCs) deployed in factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Robust DC-DC converter handling unregulated 5–24V industrial bus inputs while meeting EMC requirements. Use Value: Exposed-pad MSOP package ensures thermal stability at full 2A load across –40°C to +125°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | 40V input, 1.5A output, 3mm × 4mm MSOP, no integrated boost diode | Lower current rating; requires external Schottky; better suited for space-constrained 1.5A designs | Select when lower IOUT suffices and board layout allows external diode placement. |
| TPS54227DDAR | 28V input, 2A output, 8-pin SO PowerPAD, no PG flag, higher IQ (250µA) | Lacks power good signaling and Burst Mode; optimized for cost-sensitive industrial supplies | Select when PG flag and ultra-low IQ are not required and thermal performance via PowerPAD is acceptable. |
Compared with LTC3631EMSE#PBF and TPS54227DDAR, the LT3481IMSE#PBF uniquely combines integrated boost diode, 36V rating, 50µA Burst Mode IQ, and PG flag in a 10-lead MSOP-making it optimal for ruggedized 2A applications demanding reliability, low standby power, and power sequencing.
Availability
LT3481IMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, and industrial sensor node applications requiring stable component supply across extended temperature ranges.
Supply support for LT3481IMSE#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous qualification standards.
The LT3481 product line delivers robust, wide-input buck regulators for harsh-environment applications including automotive, industrial, and portable electronics where reliability, thermal performance, and low-noise operation are essential.
FAQ
What is the maximum input voltage rating for LT3481IMSE#PBF?
The LT3481IMSE#PBF has an absolute maximum input voltage of 36V. Continuous operation is rated up to 34V; transients up to 36V are acceptable only when the output is in regulation and no startup or short-circuit events occur. This rating applies directly to the VIN pin and is independent of switching frequency in regulated mode.
Does LT3481IMSE#PBF require an external Schottky diode?
No, the LT3481IMSE#PBF integrates a boost Schottky diode internally-connected to the BD pin-and does not require an external Schottky diode for basic operation. An external diode is only needed for the BOOST capacitor charge path, not for output rectification.
How is soft-start implemented on LT3481IMSE#PBF?
Soft-start on the LT3481IMSE#PBF is implemented via the RUN/SS pin: applying a controlled voltage ramp (using external R and C) to this pin linearly increases the internal current limit and output voltage slew rate, preventing inrush current and overshoot during startup.
What is the function of the BIAS pin on LT3481IMSE#PBF?
The BIAS pin on LT3481IMSE#PBF supplies current to the internal regulator. When tied to VOUT (>3V), it draws bias power from the output instead of VIN-reducing input current and improving light-load efficiency, especially in high VIN/VOUT ratio applications.
Can LT3481IMSE#PBF synchronize to an external clock?
No, the LT3481IMSE#PBF does not support external clock synchronization. Its switching frequency is set solely by the RT resistor (300kHz–2.8MHz) and cannot be locked to an external signal. Synchronization capability is not present in this device's architecture.
LT3481IMSE#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
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3481IMSE#PBF FAQ
1.How can I place an order for LT3481IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3481IMSE#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 LT3481IMSE#PBF reliable?
The price and inventory of LT3481IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3481IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3481IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3481IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3481IMSE#PBF?
LT3481IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3481IMSE#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 LT3481IMSE#PBF?
For technical support, including LT3481IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3481IMSE#PBF requirements.
6.How does Aetrix verify that LT3481IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3481IMSE#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 LT3481IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3481IMSE#PBF?
All LT3481IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3481IMSE#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 LT3481IMSE#PBF part is unused and in its original packaging.
Return procedure for LT3481IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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