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Analog Devices Inc. LT3980EMSE#TRPBF
- Part No.:
- LT3980EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3980EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,285
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Product details
Overview
LT3980EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a 58V input, 2A monolithic synchronous step-down switching regulator with current-mode control, 200mΩ internal NPN switch, and adjustable 100kHz–2.4MHz switching frequency. It delivers regulated 3.3V/5V outputs in automotive battery regulation and industrial supplies, featuring 85µA quiescent current in Burst Mode and 91% power-good accuracy.
For engineers reviewing the LT3980EMSE#TRPBF datasheet, LT3980EMSE#TRPBF pinout, LT3980EMSE#TRPBF application, or LT3980EMSE#TRPBF equivalent, key selection criteria include its 58V max input rating, catch-diode current sense (DA pin) for transient protection, soft-start via RUN/SS pin, thermal shutdown, and compatibility with 3mm × 4mm DFN or 16-pin MSOP packages.
Technical Context
The LT3980EMSE#TRPBF employs constant-frequency current-mode PWM control with an internal error amplifier (gm = 500 µmho) and VC pin servoing to regulate output voltage via FB feedback (790 mV nominal). Its oscillator is resistor-programmed (RT pin) and supports synchronization (SYNC pin, 250kHz–2MHz range).
Protection architecture includes overvoltage lockout (58V min), catch-diode current sensing (DA pin) to pause oscillation during overcurrent, and thermal shutdown. Bias current sourcing from VOUT (>3V) reduces quiescent current, while low-ripple Burst Mode maintains <15 mVP-P output ripple at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 58V continuous; withstands 80V transients - enables direct connection to 48V industrial or 36V automotive batteries. |
| Max Output Current | 2A DC - supports mid-power point-of-load conversion without external MOSFETs. |
| Quiescent Current | 85µA at 12VIN→3.3VOUT in Burst Mode - extends battery life in always-on systems. |
| Switching Frequency | Adjustable 100kHz–2.4MHz via RT resistor - allows trade-off between inductor size (high-freq) and efficiency (low-freq). |
| Feedback Voltage | 790 mV ±10 mV - sets precise output regulation threshold for resistor-divider programming. |
| Power Good Threshold | 91% of programmed VOUT - provides reliable enable signaling for downstream logic sequencing. |
| Thermal Shutdown | Activates at TJ ≥150°C (H-grade) - protects against sustained overload or poor heatsinking. |
| Switch On/Off Time | Min 200 ns on / 230 ns off - constrains practical duty cycle range and maximum input-output voltage ratio. |
Pinout & Package
LT3980EMSE#TRPBF is packaged in a 16-pin thermally enhanced MSOP (MSE) with exposed pad (Pin 17 = GND), θJA = 45°C/W, suitable for high-power density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Connects to inductor, catch diode cathode, and boost capacitor - carries high di/dt pulsed current. |
| FB | Feedback input | Senses output voltage divider; regulated to 790 mV - determines final VOUT accuracy and loop stability. |
| VC | Error amplifier output | Controls peak switch current; clamped to RUN/SS during soft-start - critical for compensation network design. |
| PG | Power good flag | Open-collector output active low until VOUT reaches 91% of target - used for system power sequencing. |
| RT | Oscillator frequency set | Resistor-to-GND sets fSW from 100kHz–2.4MHz - enables EMI optimization and component miniaturization. |
| VIN | Main power input | Supplies internal regulator and switch driver; bypass locally with ≥10µF ceramic - handles up to 58V continuous. |
| BD | Boost diode anode | Connects to Schottky diode anode; supplies bias to internal regulator - improves efficiency when VOUT > 3V. |
| RUN/SS | Enable & soft-start | Shuts down IC when <0.4V; ramped voltage controls output rise time - eliminates inrush current. |
| DA | Catch diode current sense | Pauses oscillator during overcurrent or input overvoltage - protects inductor and switch under fault conditions. |
| SYNC | External clock input | Accepts 250kHz–2MHz square wave - synchronizes multiple converters to avoid beat frequencies. |
| GND | Signal & power ground | Pins 8 & 17 connect to exposed pad - must be soldered to PCB copper for thermal and EMI performance. |
| BOOST | Switch drive booster | Provides >VIN voltage to saturate internal NPN switch - requires external diode + capacitor. |
| NC | No connect | Pins 3, 5, 13, 16 - electrically isolated; leave unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Catch diode current sense (DA pin) | Pauses oscillator during input overvoltage or short-circuit - prevents inductor saturation and switch failure without external sensing circuitry. |
| Burst Mode operation | Maintains <15 mVP-P output ripple at light loads while drawing only 85µA - eliminates audible noise and preserves battery runtime. |
| Output bias current sourcing | Draws operating current from VOUT when >3V - reduces VIN supply current and improves light-load efficiency by ~15%. |
| Programmable soft-start | Controlled VOUT ramp via RC network on RUN/SS - prevents inrush current and stabilizes upstream supplies. |
| Overvoltage lockout | Disables switching above 58V (min) - protects internal circuitry during load dump or hot-swap events in automotive/industrial systems. |
| Thermally enhanced MSOP | 16-pin package with exposed GND pad (θJC = 10°C/W) - enables 2A operation without heatsink in compact 4mm × 3mm footprint. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: Regulating 12V/24V/48V vehicle battery rails to 3.3V/5V for infotainment, ADAS sensors, or body control modules. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, efficient, and transient-hardened local power. Use Value: Withstands 80V load-dump transients and maintains regulation during cold-crank (down to 3.6V), ensuring system uptime. | Use Scenario: Generating intermediate rails (e.g., 5V, 12V) from a central 48V backplane in telecom or server racks. IC Role / Device Role / Timing Role: Point-of-load regulator delivering stable, low-noise power with fast transient response. Use Value: Adjustable frequency avoids EMI conflicts across multiple converters; SYNC pin enables deterministic timing alignment. |
| Industrial Supplies | Wall Transformer Regulation |
Use Scenario: Converting unregulated 24V–48V factory floor supplies to clean 3.3V/5V for PLC I/O, motor drives, or HMI displays. IC Role / Device Role / Timing Role: Robust DC/DC stage tolerant of brownouts, surges, and wide ambient temperature (-40°C to 125°C). Use Value: Thermal shutdown and overvoltage lockout ensure reliability in harsh environments; 2A output supports higher-power peripherals. | Use Scenario: Replacing linear regulators in AC/DC wall adapters to improve efficiency and reduce heat in space-constrained enclosures. IC Role / Device Role / Timing Role: High-efficiency switching regulator replacing LM78xx series in universal-input offline supplies. Use Value: 85µA quiescent current meets Energy Star standby requirements; small MSOP package fits legacy footprints. |
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 max input, 1.5A output, fixed 2MHz frequency, no DA pin or SYNC - lower voltage/current capability, simpler feature set. | Best for cost-sensitive, lower-power designs where 58V tolerance and catch-diode sensing are unnecessary. | Select LTC3631EMSE#PBF when input stays below 40V and system-level fault protection is handled externally. |
| MPQ4420AGL-AEC1-Z | 40V max input, 2A output, AEC-Q100 qualified, integrated MOSFETs, no DA pin - automotive-grade but lacks transient sensing and wide VIN range. | Preferred for production automotive ECUs requiring qualification, but not for 48V+ industrial or load-dump-prone systems. | Choose MPQ4420AGL-AEC1-Z only if AEC-Q100 compliance is mandatory and input voltage remains ≤40V. |
Compared with LTC3631EMSE#PBF and MPQ4420AGL-AEC1-Z, the LT3980EMSE#TRPBF uniquely combines 58V input tolerance, catch-diode current sensing for transient resilience, and programmable frequency/synchronization - making it the only option for ruggedized 48V industrial or commercial automotive front-end regulation.
Availability
LT3980EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, distributed supply regulation, and industrial supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3980EMSE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT3980 product line was designed for high-voltage, high-reliability DC/DC conversion in automotive, industrial, and telecom infrastructure - emphasizing transient robustness, low IQ, and flexible frequency control.
FAQ
What is the absolute maximum input voltage rating for the LT3980EMSE#TRPBF?
The LT3980EMSE#TRPBF has an absolute maximum input voltage rating of 80V for non-repetitive 1-minute transients. Continuous operation is rated up to 58V minimum (61.5V typical), with overvoltage lockout disabling switching above that threshold. This makes the LT3980EMSE#TRPBF suitable for 48V systems subject to load dump or surge events common in automotive and industrial environments.
How does the DA pin function in the LT3980EMSE#TRPBF, and what protection does it provide?
The DA pin on the LT3980EMSE#TRPBF senses current through the external catch diode and pauses the oscillator during overcurrent or input overvoltage conditions. This prevents inductor saturation and switch overstress without requiring external current-sense resistors or controllers. The LT3980EMSE#TRPBF uses this feature to maintain safe peak inductor current even at high switching frequencies or during 80V transients.
Can the LT3980EMSE#TRPBF operate efficiently at very light loads, and how is this achieved?
Yes, the LT3980EMSE#TRPBF achieves high light-load efficiency via low-ripple Burst Mode operation, drawing only 85µA from VIN at 12VIN→3.3VOUT. In this mode, the controller shuts down all non-essential circuitry between bursts, reducing quiescent current while maintaining output ripple below 15mVP-P. Additionally, when VOUT exceeds 3V, the LT3980EMSE#TRPBF draws bias current from the output rail - further improving system-level efficiency.
What package type and thermal characteristics apply to the LT3980EMSE#TRPBF?
The LT3980EMSE#TRPBF uses a 16-pin plastic MSOP (MSE) package with an exposed thermal pad (Pin 17 = GND). Its thermal resistance is θJA = 45°C/W and θJC = 10°C/W when the exposed pad is properly soldered to PCB copper. This enables full 2A output capability without a heatsink in ambient temperatures up to 125°C - verified across the –40°C to 125°C operating range.
Does the LT3980EMSE#TRPBF support synchronization with other switching regulators, and what is the valid frequency range?
Yes, the LT3980EMSE#TRPBF supports external clock synchronization via its SYNC pin, accepting square-wave inputs from 250kHz to 2MHz. This allows deterministic phase alignment across multiple converters to minimize beat frequencies and EMI peaks. When unused, the SYNC pin must be tied to GND to ensure low-ripple Burst Mode operation at light loads - a requirement explicitly stated in the LT3980EMSE#TRPBF datasheet.
LT3980EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (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):
- 58V
- Voltage - Output (Min/Fixed):
- 0.79V
- Voltage - Output (Max):
- 57.42V
- Current - Output:
- 2A
- Frequency - Switching:
- 225kHz ~ 2.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3980EMSE#TRPBF FAQ
1.How can I place an order for LT3980EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3980EMSE#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 LT3980EMSE#TRPBF reliable?
The price and inventory of LT3980EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3980EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3980EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3980EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3980EMSE#TRPBF?
LT3980EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3980EMSE#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 LT3980EMSE#TRPBF?
For technical support, including LT3980EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3980EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3980EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3980EMSE#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 LT3980EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3980EMSE#TRPBF?
All LT3980EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3980EMSE#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 LT3980EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3980EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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