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Analog Devices Inc. LT3480IMSE#TRPBF
- Part No.:
- LT3480IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3480IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,149
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Product details
Overview
LT3480IMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 36V input, 2A monolithic synchronous step-down switching regulator with current-mode control, 2.4MHz max switching frequency, 70µA quiescent current in Burst Mode, and integrated boost Schottky diode - used for automotive battery regulation and industrial distributed supplies.
For engineers reviewing the LT3480IMSE#TRPBF datasheet, LT3480IMSE#TRPBF pinout, LT3480IMSE#TRPBF application, or LT3480IMSE#TRPBF equivalent, key selection considerations include its 3.6V–36V input range, 0.25Ω switch on-resistance, 0.790V feedback reference, power good flag, and soft-start via RUN/SS pin - all critical for high-reliability DC/DC conversion in constrained thermal environments.
Technical Context
The LT3480IMSE#TRPBF employs constant-frequency current-mode PWM control with an internal 0.25Ω NPN bipolar switch and integrated boost diode driver. Its oscillator supports 200kHz–2.4MHz operation via RT resistor programming and includes frequency foldback during startup or overload to limit peak inductor current.
Burst Mode operation reduces quiescent current to 70µA at light loads while maintaining output ripple below 15mV; bias current can be drawn from VOUT (>3V) to further improve efficiency. The device features overvoltage lockout (36V min), 86% power-good threshold, and soft-start controlled by external RC on RUN/SS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V transients - enables direct connection to 24V/36V industrial or automotive batteries. |
| Max Output Current | 2A DC - supports mid-power point-of-load regulation without external MOSFETs. |
| Switching Frequency | 200kHz to 2.4MHz (RT-programmable) - allows tradeoff between small magnetics (high fSW) and high VIN/VOUT ratio support (low fSW). |
| Quiescent Current | 70µA at 12VIN→3.3VOUT in Burst Mode - extends battery life in always-on portable or IoT applications. |
| Feedback Reference | 0.790V ±10mV - enables precise output voltage setting from 0.79V to 20V using standard resistor dividers. |
| Power Good Threshold | 86% of regulated VOUT - provides reliable system enable signaling with 12mV hysteresis for noise immunity. |
| Shutdown Current | <1µA - ensures near-zero standby drain when disabled via RUN/SS pin. |
| Thermal Rating | –40°C to 125°C junction - qualified for extended-temperature industrial and automotive under-hood use. |
Pinout & Package
LT3480IMSE#TRPBF is housed in a thermally enhanced 10-lead MSOP package (3mm × 3mm footprint) with exposed pad (Pin 11) soldered to PCB ground for low θJA = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (1) | Boost Diode Anode Supply | Provides bias current to internal regulator; connects to boost diode anode and may source current from VOUT if >3V - improves light-load efficiency. |
| BOOST (2) | Bootstrap Drive Voltage | Supplies elevated gate drive to internal NPN switch via external capacitor/diode - ensures full saturation and low 0.25Ω RCE(SAT). |
| SW (3) | Switch Node | High-current output of internal power switch; connects to inductor, catch diode, and boost capacitor - requires tight layout for EMI control. |
| VIN (4) | Main Input Supply | Primary power input (3.6V–36V); powers internal regulator and switch - must be locally bypassed with ≥4.7µF ceramic capacitor. |
| RUN/SS (5) | Enable & Soft-Start Control | Logic-level shutdown input (0.2V low / 2.5V high); external RC generates controlled VOUT ramp - prevents inrush and enables sequencing. |
| SYNC (6) | External Clock Input | Accepts 250kHz–2MHz clock for synchronization to system timing - eliminates beat frequencies in multi-regulator systems. |
| PG (7) | Power Good Flag | Open-collector output asserting high when VOUT reaches 86% of target - drives pull-up resistor to signal system controller. |
| FB (8) | Feedback Input | Senses resistor divider output; regulated to 0.790V - sets output voltage as VOUT = 0.79V × (1 + R1/R2). |
| VC (9) | Error Amplifier Output | Controls peak switch current; external RC compensation network stabilizes loop - determines transient response and phase margin. |
| RT (10) | Frequency Set Resistor | Grounded resistor programs switching frequency from 200kHz to 2.4MHz - enables optimization for size, efficiency, or input range. |
| Exposed Pad (11) | Thermal Ground | Internally connected to GND; must be soldered to PCB copper pour - essential for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode Driver | Eliminates external boost diode and associated board space; enables efficient bipolar switch saturation across full load range. |
| Low-Ripple Burst Mode Operation | Maintains output ripple <15mV at light loads while achieving 70µA IQ - avoids audible noise and preserves regulation in battery-powered standby modes. |
| Adjustable Switching Frequency (200kHz–2.4MHz) | Allows optimization of inductor/capacitor size vs. efficiency vs. input voltage range - e.g., 800kHz balances 5.6µH inductor size and 90%+ efficiency at 12V→5V. |
| Power Good Flag with Hysteresis | Provides clean, noise-immune system enable signal with 12mV hysteresis - simplifies power sequencing in FPGA, microcontroller, or DSP supply rails. |
| Soft-Start via RUN/SS Pin | External RC network controls output voltage ramp rate - prevents inrush current, limits stress on input capacitors, and enables safe hot-plug operation. |
| Overvoltage Lockout (36V min) | Disables switching above 36V input while sustaining up to 60V transients - protects downstream circuitry in automotive load-dump or industrial surge events. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
|
Use Scenario: Regulating 12V/24V vehicle battery to stable 3.3V or 5V for infotainment MCU, CAN transceiver, or sensor interface. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, ripple-controlled DC supply with load dump survivability. Use Value: Withstands 60V transients and operates down to 3.6V cold-crank input - eliminates need for external TVS or pre-regulator stages. |
Use Scenario: Generating local 5V/12V rails from 24V/36V factory bus for PLC I/O modules, motor drivers, or fieldbus interfaces. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with programmable frequency to avoid EMI conflicts with communication clocks. Use Value: 2.4MHz max switching enables <10mm² solution size with 4.7µH inductor and 22µF ceramic output cap - saves PCB area in dense control cabinets. |
| Portable Medical Instrumentation | Test & Measurement Equipment |
|
Use Scenario: Powering low-noise analog front-ends and ADCs in handheld ultrasound or patient monitors from Li-ion battery packs. IC Role / Device Role / Timing Role: Low-quiescent, low-ripple DC/DC stage preceding LDO post-regulation for sensitive analog circuits. Use Value: 70µA Burst Mode IQ extends battery runtime; <15mV output ripple minimizes SNR degradation in µV-level signal chains. |
Use Scenario: Supplying precision DACs, op-amps, and reference buffers in benchtop multimeters or signal generators. IC Role / Device Role / Timing Role: Stable, low-drift intermediate rail generator with power-good monitoring for self-test and calibration sequences. Use Value: 0.790V ±10mV reference and 86% PG threshold ensure accurate voltage margining and deterministic power-up sequencing. |
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, 3MHz max fSW, no integrated boost diode - requires external Schottky; 20µA IQ in Burst Mode. | Better suited for ultra-low-IQ battery apps but lacks BD pin efficiency boost and lower max current. | Select LTC3631EMSE#PBF only when minimum quiescent current (<25µA) outweighs need for 2A output and integrated boost drive. |
| MP2451DT-LF-Z | 36V input, 2A, 2MHz max fSW, no PG flag or SYNC, 100µA IQ, DFN-8 package - smaller footprint but fewer control features. | Targeted at cost-sensitive industrial supplies where power-good signaling and clock sync are unnecessary. | Choose MP2451DT-LF-Z for simplified BOM and layout when PG, SYNC, and soft-start are not required. |
Compared with LTC3631EMSE#PBF and MP2451DT-LF-Z, the LT3480IMSE#TRPBF uniquely combines 2A capability, integrated boost diode drive, power good flag, and 70µA Burst Mode IQ in a single MSOP package - making it optimal for automotive and industrial designs requiring robustness, feature completeness, and thermal reliability.
Availability
LT3480IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3480IMSE#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 full technical and manufacturing continuity for the LT® product family - recognized for high-performance analog, power management, and signal conditioning ICs.
The LT3480IMSE#TRPBF belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for ruggedized DC/DC conversion in automotive, industrial, and avionics applications where wide input range, transient tolerance, and thermal resilience are mandatory.
FAQ
What is the maximum input voltage rating for LT3480IMSE#TRPBF?
The LT3480IMSE#TRPBF has an absolute maximum VIN rating of 60V for nonrepetitive transients (≤1 second), with continuous operation rated up to 36V. Its overvoltage lockout activates at ~38V typical, disabling switching to protect internal circuitry while sustaining the 60V transient - critical for automotive load-dump compliance. This behavior is confirmed in the Absolute Maximum Ratings table and Applications Information section of the official datasheet.
Does LT3480IMSE#TRPBF require an external boost diode?
No, the LT3480IMSE#TRPBF integrates the boost Schottky diode driver circuitry and only requires an external discrete Schottky diode connected between BD and BOOST pins - the diode itself is not integrated. The datasheet explicitly states "integrated boost Schottky diode" refers to the driver, not the diode; Figure 1 shows the external PDS360 diode in the typical application. This distinction reduces component count while retaining flexibility in diode selection for thermal or leakage optimization.
What is the purpose of the BD pin on LT3480IMSE#TRPBF?
The BD (Bias Diode) pin on LT3480IMSE#TRPBF serves two functions: (1) it supplies current to the internal bias regulator, and (2) when connected to an output voltage >3V, it draws bias current from VOUT instead of VIN - improving light-load efficiency. Per the Pin Functions section, BD must be locally bypassed with a 1µF low-ESR capacitor if not tied directly to VOUT. This dual-role design is a key differentiator enabling sub-100µA quiescent operation in battery-powered systems.
Can LT3480IMSE#TRPBF synchronize to an external clock?
Yes, the LT3480IMSE#TRPBF supports external clock synchronization via the SYNC pin (Pin 6), accepting TTL/CMOS-compatible signals from 250kHz to 2MHz. When synchronized, the device disables Burst Mode and locks to the external clock edge - eliminating beat frequencies in multi-rail systems. The datasheet specifies rise/fall times <1µs and defines logic thresholds (0.5V low, 0.7V high), confirming deterministic sync capability without additional level-shifting circuitry.
What thermal performance can be expected from LT3480IMSE#TRPBF in MSOP package?
The LT3480IMSE#TRPBF in 10-lead MSOP achieves θJA = 45°C/W and θJC = 10°C/W when its exposed pad (Pin 11) is soldered to a minimum 1cm² PCB copper pour. This enables 2A continuous operation at TA = 85°C ambient with proper layout - verified in Thermal Characteristics and Typical Performance plots (e.g., Figure G01–G02). The exposed pad is internally grounded and mandatory for thermal and EMI performance, per the Package Description and Pin Configuration sections.
LT3480IMSE#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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.79V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 2.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3480IMSE#TRPBF FAQ
1.How can I place an order for LT3480IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3480IMSE#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 LT3480IMSE#TRPBF reliable?
The price and inventory of LT3480IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3480IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3480IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3480IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3480IMSE#TRPBF?
LT3480IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3480IMSE#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 LT3480IMSE#TRPBF?
For technical support, including LT3480IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3480IMSE#TRPBF requirements.
6.How does Aetrix verify that LT3480IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3480IMSE#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 LT3480IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3480IMSE#TRPBF?
All LT3480IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3480IMSE#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 LT3480IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3480IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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