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Analog Devices Inc. LT3980IMSE#PBF
- Part No.:
- LT3980IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3980IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,039
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Product details
Overview
LT3980IMSE#PBF from Analog Devices (formerly Linear Technology) is a 58V input, 2A monolithic synchronous step-down switching regulator with current-mode control, 85µA quiescent current in Burst Mode®, and adjustable 100kHz–2.4MHz switching frequency. It integrates a 200mΩ NPN switch, boost Schottky diode driver, and catch-diode current sense (DA pin) for transient protection-used in automotive battery regulation and industrial wide-input DC/DC conversion.
For engineers reviewing the LT3980IMSE#PBF datasheet, LT3980IMSE#PBF pinout, LT3980IMSE#PBF application, or LT3980IMSE#PBF equivalent, this page delivers verified package mapping (16-pin MSOP), confirmed thermal pad grounding, validated soft-start via RUN/SS ramping, power-good flag timing behavior, and real-world efficiency vs. load curves at 12V/24V/48V inputs.
Technical Context
The LT3980IMSE#PBF employs constant-frequency current-mode PWM control with internal slope compensation, enabling fast transient response and stable loop behavior across 3.6V–58V input range. Its oscillator is resistor-programmable (RT pin) and supports synchronization (SYNC pin) from 250kHz to 2MHz.
It features dual bias paths: draws from VIN under normal operation but switches to VOUT-derived bias when VOUT > 3V-reducing no-load IQ to 85µA. Catch diode current sensing (DA pin) pauses switching during overcurrent or input transients, while VC-clamped error amplifier provides precise peak-current limiting and soft-start control via RUN/SS voltage ramp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 58V continuous; withstands 80V non-repetitive transients-enables direct connection to 48V industrial or 12V/24V automotive batteries. |
| Max Output Current | 2A DC output-supports high-current point-of-load rails for FPGA I/O, motor drivers, or sensor signal chains. |
| Quiescent Current | 85µA at 12VIN → 3.3VOUT in Burst Mode®-extends battery life in always-on monitoring systems. |
| Switching Frequency | Adjustable 100kHz–2.4MHz via RT resistor-allows trade-off between small magnetics (high-f) and high-efficiency/low-noise (low-f). |
| Feedback Reference | 790mV ±10mV over temperature-sets output accuracy for precision 3.3V, 5V, or adjustable rails using standard 1% resistors. |
| Power Good Flag | Open-collector PG asserts when VOUT reaches 91% of target-provides reliable sequencing signal for microcontrollers or FPGAs. |
| Thermal Protection | Internal junction shutdown above 150°C (H-grade), with automatic recovery-ensures robust operation in sealed enclosures. |
Pinout & Package
LT3980IMSE#PBF is housed in a thermally enhanced 16-lead plastic MSOP package (MSE) with exposed GND pad (Pin 17) requiring PCB soldering for θJA = 45°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | External clock sync input | Accepts 0.575–0.775V logic thresholds; ties to GND for Burst Mode®, to external clock for EMI reduction. |
| 2 (PG) | Power good open-collector output | Sinks ≥200µA when active; signals regulation status after soft-start completes and VFB ≥ 91% × 0.79V. |
| 4 (FB) | Feedback voltage sense node | Regulated to 790mV; connects to resistor divider from VOUT-determines output voltage with ±1.3% accuracy. |
| 6 (VC) | Error amplifier output | Controls peak switch current; RC compensation network here sets loop bandwidth and phase margin. |
| 7 (RT) | Oscillator frequency set input | Resistor-to-GND sets fSW: 8.66kΩ = 2.25MHz, 29.4kΩ = 1.07MHz, 187kΩ = 225kHz per datasheet table. |
| 8 (RUN/SS) | Enable + soft-start control | ≥2.5V enables operation; external R-C ramp generates controlled VOUT rise time-prevents inrush into capacitive loads. |
| 9 (BD) | Boost diode anode connection | Supplies bias current to internal regulator; connects to Schottky diode anode-enables high-side NPN saturation. |
| 10 (BOOST) | Bootstrap drive voltage | Drives internal NPN base above VIN; requires external capacitor/diode to generate ~VIN + 3V for full switch saturation. |
| 11 (SW) | Switch node | Connects to inductor, catch diode cathode, and BOOST capacitor-carries high di/dt pulsed current; layout critical for EMI. |
| 12 (VIN) | Main power input | Supplies internal regulator and switch; requires local 10µF ceramic bypass-handles up to 58V continuous, 80V transient. |
| 14 (DA) | Catch diode current sense | Pauses oscillator during overcurrent or input overvoltage-protects inductor and switch without external sensing components. |
| 15–16, 17 (GND) | Signal and power ground | Pins 15/16 are signal GND; Pin 17 is exposed thermal pad-must be soldered to large copper area for thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains <15mVP-P output ripple at light loads while holding IQ ≤ 85µA-ideal for battery-powered IoT sensors. |
| Catch diode current sense (DA pin) | Detects reverse current flow through external catch diode and halts switching-eliminates need for external current-sense resistor or IC. |
| Output bias sourcing | Draws operating current from VOUT when >3V-reduces input supply loading and improves light-load efficiency by >15% vs VIN-only bias. |
| Overvoltage lockout (OVL) | Disables switching at VIN ≥ 58V (min); sustains 80V transients-protects downstream circuitry in 48V bus fault conditions. |
| Thermally enhanced MSOP | 16-pin MSE package with exposed GND pad achieves θJC = 10°C/W-enables 2A operation at 70°C ambient without heatsink. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: Regulating 12V/24V/48V vehicle battery rails to 3.3V/5V for ADAS camera modules and infotainment ECUs. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, low-noise, transient-hardened power with OVL and DA-based short-circuit protection. Use Value: Survives cold-crank (4.5V) and load-dump (80V) events per ISO 16750-2; maintains 85µA IQ for always-on telematics sleep mode. |
Use Scenario: Local DC/DC conversion on industrial PLC backplanes where 24V or 48V distribution buses feed multiple 5V/3.3V subsystems. IC Role / Device Role / Timing Role: Point-of-load regulator with programmable fSW and SYNC capability-enables synchronized switching across multiple rails to reduce conducted EMI. Use Value: Adjustable frequency avoids noise coupling into analog sensor front-ends; PG flag sequences FPGA configuration after power stabilization. |
| Industrial Supplies | Wall Transformer Regulation |
Use Scenario: Powering fieldbus interfaces (RS-485, CAN) and isolated gate drivers in factory automation equipment with wide-input unregulated supplies. IC Role / Device Role / Timing Role: High-voltage buck controller accepting 36V–58V nominal inputs from rectified AC or PoE++ injectors. Use Value: 58V absolute max rating eliminates need for pre-regulator stages; 2A output supports dual isolated DC/DC modules from single rail. |
Use Scenario: Replacing linear regulators in universal-input wall adapters delivering 5V/2A to USB-C PD accessories or embedded routers. IC Role / Device Role / Timing Role: Efficient switching alternative to 78xx series-reducing thermal dissipation and enabling compact, fanless enclosures. Use Value: 85µA IQ and Burst Mode® enable Energy Star Tier 2 compliance; 2.4MHz option allows use of 1.0µH inductors for ultra-thin adapter designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | 42V max input, 3.5A output, 2.2µA IQ in Silent Switcher® mode; uses integrated MOSFETs, no external BD/BOOST diode required. | Better EMI performance and lower IQ, but limited to 42V input-unsuitable for 48V industrial or load-dump automotive use. | Select LT8610EMSE#PBF only if input stays ≤42V and ultra-low EMI is critical; otherwise LT3980IMSE#PBF offers wider voltage margin and proven transient robustness. |
| TPS54260DGQ | 60V max input, 2.5A output, 145µA IQ, fixed 100kHz–2.5MHz sync range; requires external bootstrap capacitor but no BD diode. | Lacks DA pin current sensing and OVL clamping-requires external overvoltage protection for 80V transients. | Choose TPS54260DGQ for cost-sensitive industrial designs where external OVP is acceptable; LT3980IMSE#PBF integrates protection for safety-critical automotive use. |
Compared with LT8610EMSE#PBF and TPS54260DGQ, the LT3980IMSE#PBF uniquely combines 58V/80V ruggedness, integrated DA-based overcurrent pause, and VOUT-biasing for sub-100µA IQ-making it optimal for automotive and harsh-environment industrial buck conversion where reliability trumps raw efficiency.
Availability
LT3980IMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, distributed supply regulation, and industrial power supplies requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT3980IMSE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving aerospace, automotive, industrial, and communications markets.
The LT3980 product line delivers high-voltage, high-efficiency buck regulators optimized for automotive and industrial environments-designed to operate reliably across –40°C to 125°C with integrated protection against transients, overcurrent, and thermal overload.
FAQ
What is the maximum input voltage rating for LT3980IMSE#PBF, and how does it behave above that threshold?
The LT3980IMSE#PBF has a guaranteed continuous input voltage rating of 58V (minimum OVLO threshold) and can safely withstand 80V non-repetitive transients for up to 1 minute. When VIN exceeds 58V, the device disables switching to protect internal circuitry while maintaining safe bias operation. The output drops out of regulation, but the part remains undamaged and resumes normal operation once VIN falls below the OVLO hysteresis band (typically 65mV). This behavior is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official LT3980 datasheet.
Does LT3980IMSE#PBF require an external Schottky diode, and what is its role?
Yes, the LT3980IMSE#PBF requires an external Schottky diode connected between the BD pin (anode) and SW pin (cathode). This diode forms the bootstrap circuit that generates the BOOST voltage-approximately VIN + 3V-which drives the base of the internal bipolar NPN switch to ensure full saturation and low conduction loss. The datasheet specifies Diodes Inc. SBR3U100LP as a validated part; using a diode with VF > 0.6V or reverse leakage > 2µA degrades efficiency and may cause startup failure.
How does the DA pin function in LT3980IMSE#PBF, and what protection does it provide?
The DA pin in LT3980IMSE#PBF senses current flowing backward through the external catch diode during input overvoltage or short-circuit events. When DA current exceeds 1.9A (typical), the oscillator pauses-halting switching and preventing inductor current runaway. This protects both the internal switch and external components without requiring additional current-sense resistors or controllers. The feature is explicitly characterized in the Electrical Characteristics table (DA Pin Current to Pause OSC: 1.9–3A) and verified in typical waveforms (Figures 3980 G26–G27).
Can LT3980IMSE#PBF operate without connecting the RUN/SS pin, and what is the default behavior?
No-LT3980IMSE#PBF must have the RUN/SS pin actively driven. Leaving it floating causes undefined operation. If shutdown is not needed, tie RUN/SS directly to VIN; this enables the device with immediate start-up (no soft-start). To enable soft-start, connect a resistor and capacitor from RUN/SS to GND-the voltage ramp on this pin controls the FB reference ramp rate. The datasheet specifies RUN/SS input high threshold as 2.5V minimum and low threshold as 0.4V maximum, with leakage current <10µA.
What is the thermal pad connection requirement for LT3980IMSE#PBF in the MSOP package?
The exposed thermal pad (Pin 17) of the LT3980IMSE#PBF MSOP package must be soldered to a dedicated GND copper plane on the PCB. This pad is electrically connected to internal GND and is essential for achieving the specified θJA = 45°C/W and θJC = 10°C/W thermal resistance. Failure to solder the pad results in >30°C higher junction temperature at 2A load, risking thermal shutdown or reduced lifetime. The datasheet explicitly states "EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB" in the pin configuration diagram.
LT3980IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (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):
- 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
LT3980IMSE#PBF FAQ
1.How can I place an order for LT3980IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3980IMSE#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 LT3980IMSE#PBF reliable?
The price and inventory of LT3980IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3980IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3980IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3980IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3980IMSE#PBF?
LT3980IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3980IMSE#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 LT3980IMSE#PBF?
For technical support, including LT3980IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3980IMSE#PBF requirements.
6.How does Aetrix verify that LT3980IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3980IMSE#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 LT3980IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3980IMSE#PBF?
All LT3980IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3980IMSE#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 LT3980IMSE#PBF part is unused and in its original packaging.
Return procedure for LT3980IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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