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Analog Devices Inc. LT3980EMSE#PBF
- Part No.:
- LT3980EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3980EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,122
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Product details
Overview
LT3980EMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic 58V input, 2A 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, 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 LT3980EMSE#PBF datasheet, LT3980EMSE#PBF pinout, LT3980EMSE#PBF application, or LT3980EMSE#PBF equivalent, key selection criteria include its 58V max input rating, 2A output capability, thermal-enhanced 16-pin MSOP package with exposed pad, low-noise Burst Mode® operation (<15mVP-P), and power-good flag signaling at 91% of regulated VOUT.
Technical Context
The LT3980EMSE#PBF employs constant-frequency current-mode PWM control with RT-resistor programmable oscillator (100kHz–2.4MHz), internal error amplifier (gm = 500 µmho), and active VC-pin clamp for peak-current limiting. Its bipolar NPN switch is driven via BOOST pin with external bootstrap capacitor/diode to ensure saturation at high VIN.
It features dual protection architecture: overvoltage lockout triggers at 58V (min), sustaining 80V transients; DA pin monitors catch-diode current to pause oscillation during short-circuit or input overvoltage events. Soft-start is implemented via RUN/SS pin ramping, and PG flag asserts open-collector when FB reaches 91% of 790mV reference.
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. |
| Output Current | 2A maximum continuous-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. |
| Switch On-Resistance | 200mΩ typical-minimizes conduction loss at full load, enabling >90% efficiency at 12VIN/5VOUT. |
| Feedback Reference | 790mV ±12mV (–40°C to 125°C)-ensures precise output regulation across temperature and line/load variations. |
| Power Good Threshold | 91% of regulated VOUT with 14mV hysteresis-provides reliable system power sequencing and fault detection. |
| Thermal Rating | Junction range –40°C to 125°C (E-grade); θJA = 45°C/W, θJC = 10°C/W-requires exposed pad soldering for safe 2A operation. |
Pinout & Package
LT3980EMSE#PBF is housed in a thermally enhanced 16-pin plastic MSOP package (4mm × 3mm) with exposed pad (Pin 17) tied to GND-requires PCB copper pour and multiple thermal vias for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | External clock synchronization input | Accepts 0.575–0.775V logic threshold; enables noise-immune multi-regulator synchronization or Burst Mode® selection when grounded. |
| 2 (PG) | Open-collector power-good flag | Sinks ≥200µA when asserted; signals VOUT stability at 91% of target-used for MCU reset or downstream enable sequencing. |
| 4 (FB) | Feedback voltage sensing node | Regulated to 790mV; connects to resistor divider-sets output voltage per VOUT = 0.79V × (1 + R1/R2). |
| 6 (VC) | Error amplifier output | Controls peak switch current; clamped to RUN/SS voltage for soft-start-external RC compensation stabilizes loop dynamics. |
| 7 (RT) | Oscillator frequency programming | Resistor-to-GND sets fSW from 100kHz to 2.4MHz-e.g., 32.4kΩ yields 1MHz per datasheet Figure 1. |
| 9 (RUN/SS) | Enable and soft-start control | Logic-high (>2.5V) enables operation; RC ramp on this pin controls VOUT rise time-reduces inrush current and EMI. |
| 10 (BD) | Boost diode anode connection | Supplies bias current to internal regulator; draws <2µA leakage-can be tied to VOUT >3V to improve light-load efficiency. |
| 11 (BOOST) | Bootstrap drive voltage | Must exceed SW by ≤30V; drives NPN base via external capacitor/diode-ensures full switch saturation up to 58VIN. |
| 12 (SW) | Switch node | Connects to inductor, catch diode cathode, and boost capacitor-carries high di/dt; requires tight layout to minimize EMI. |
| 14 (VIN) | Main power input | Supplies internal regulator and switch; must be locally bypassed with ≥10µF X7R ceramic-handles up to 80V transients. |
| 15 (DA) | Catch-diode current sense | Pauses oscillator during overcurrent; protects against short-circuit and input overvoltage-no external sense resistor needed. |
| 8, 17 (GND) | Signal and power ground | Exposed pad (Pin 17) is GND-mandatory soldering to PCB thermal plane for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Maintains <15mVP-P output ripple at light loads while drawing only 85µA IQ-ideal for battery-powered standby circuits. |
| Catch Diode Current Sense (DA) | Monitors diode conduction in real time and halts switching during overcurrent-eliminates need for external current-sense resistor or IC. |
| Overvoltage Lockout (OVL) | Disables switching at 58V (min) input, protecting downstream circuitry during load-dump transients common in automotive 12V/24V systems. |
| Power Good Flag (PG) | Open-collector output with 200µA sink capability-provides deterministic power sequencing signal for FPGAs, DSPs, or microcontrollers. |
| Thermally Enhanced MSOP | 16-pin package with exposed pad (θJC = 10°C/W)-delivers 2A output with minimal heatsinking in space-constrained industrial modules. |
| Adjustable Frequency Synchronization | RT pin sets fSW from 100kHz to 2.4MHz; SYNC pin accepts external clock up to 2MHz-enables EMI reduction via spread-spectrum or fixed-frequency coordination. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
|
Use Scenario: Regulating 12V/24V vehicle battery (with 80V load-dump transients) to 3.3V/5V for infotainment ECUs and ADAS sensors. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, protected, and sequenced power to safety-critical subsystems. Use Value: OVL and DA pin protection prevent latch-up during cold-crank or jump-start events; PG flag ensures clean boot of vision processors. |
Use Scenario: Point-of-load conversion in factory automation PLCs where 48V backplane supplies multiple 5V/3.3V rails. IC Role / Device Role / Timing Role: High-efficiency, wide-input DC/DC stage delivering stable 2A output with minimal board area. Use Value: 200mΩ switch and thermally optimized MSOP enable >92% efficiency at full load without heatsinks-reducing system thermal mass. |
| Industrial Supplies | Wall Transformer Regulation |
|
Use Scenario: Converting unregulated 24–56V industrial DC bus to 5V for programmable logic controllers and I/O modules. IC Role / Device Role / Timing Role: Robust primary regulator tolerant of brownouts, surges, and long cable drops. Use Value: Minimum 3.6V start-up and 58V operating range accommodate aging power supplies and field wiring losses. |
Use Scenario: Replacing linear regulators in AC/DC wall adapters requiring low-noise, high-efficiency 5V/2A output. IC Role / Device Role / Timing Role: Compact, low-IQ switching solution replacing LM7805-based designs with >70% less heat generation. Use Value: 85µA Burst Mode® IQ meets Energy Star Level VI standby requirements; small MSOP footprint fits legacy adapter PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | 42V max input, 3.5A output, 2.2MHz sync capability, 2.5µA shutdown IQ; uses integrated MOSFETs (no external BD/BOOST diode required). | Better suited for compact, high-frequency designs with lower input voltage (<42V); lacks DA pin overcurrent pause function. | Select LT8610EMSE#PBF when input is ≤42V and ultra-low shutdown current is critical; avoid if 58V operation or catch-diode fault protection is required. |
| TPS54260DGQR | 60V max input, 2.5A output, 100kHz–2.5MHz adjustable frequency, 1.8µA shutdown IQ; requires external bootstrap diode and separate current-sense resistor. | Offers higher current and wider frequency range but adds BOM cost and layout complexity; no integrated DA protection. | Choose TPS54260DGQR for cost-sensitive industrial designs needing >2A output and TI ecosystem support; accept added component count and reduced fault coverage. |
Compared with LT3980EMSE#PBF, LT8610EMSE#PBF delivers higher current and lower shutdown current but sacrifices 58V operation and DA-based fault protection; TPS54260DGQR extends input range to 60V and increases output current, yet requires external components for functionality LT3980EMSE#PBF integrates on-die.
Availability
LT3980EMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, distributed supply regulation, and industrial power supply applications requiring stable component supply, extended temperature operation (–40°C to 125°C), and robust transient protection.
Supply support for LT3980EMSE#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 industrial, automotive, communications, and healthcare markets.
The LT3980EMSE#PBF belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for rugged, wide-input industrial and automotive DC/DC conversion where reliability under transients and low quiescent power are critical.
FAQ
What is the absolute maximum input voltage rating for the LT3980EMSE#PBF?
The LT3980EMSE#PBF has an absolute maximum VIN rating of 80V for non-repetitive 1-minute transients. Continuous operation is rated up to 58V, with overvoltage lockout engaging at 58V (minimum) to disable switching and protect internal circuitry. This makes the LT3980EMSE#PBF suitable for automotive load-dump and industrial surge environments where transient immunity is essential.
How does the DA pin on the LT3980EMSE#PBF provide overcurrent protection?
The DA pin on the LT3980EMSE#PBF senses current flowing through the external catch diode and pauses the oscillator when current exceeds ~2.4A, preventing inductor saturation and switch overstress during short-circuit or input overvoltage events. Unlike traditional current-sense methods, this feature requires no external resistor or amplifier-directly enhancing system reliability in fault conditions without increasing BOM count.
Can the LT3980EMSE#PBF operate efficiently at very light loads?
Yes-the LT3980EMSE#PBF uses low-ripple Burst Mode® operation to maintain high efficiency down to microamp-level loads, drawing only 85µA from VIN at 12VIN → 3.3VOUT while keeping output ripple below 15mVP-P. This behavior is intrinsic to the IC's architecture and requires no external configuration, making it ideal for always-on IoT nodes and automotive standby systems.
What package type and thermal characteristics apply to the LT3980EMSE#PBF?
The LT3980EMSE#PBF uses a 16-pin plastic MSOP package with exposed thermal pad (Pin 17). Its thermal resistance is θJA = 45°C/W and θJC = 10°C/W, requiring the exposed pad to be soldered to a PCB copper plane with multiple thermal vias. This construction enables full 2A output at 125°C junction temperature without additional heatsinking-critical for dense industrial modules.
Does the LT3980EMSE#PBF support frequency synchronization with other converters?
Yes-the LT3980EMSE#PBF supports external clock synchronization via its SYNC pin (Pin 1), accepting logic-level clocks from 250kHz to 2MHz with fast edge rates (<1µs). This allows EMI reduction through fixed-frequency coordination or dithering, and eliminates beat frequencies in multi-rail systems-without compromising its native 100kHz–2.4MHz RT-programmable range.
LT3980EMSE#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
LT3980EMSE#PBF FAQ
1.How can I place an order for LT3980EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3980EMSE#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 LT3980EMSE#PBF reliable?
The price and inventory of LT3980EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3980EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3980EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3980EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3980EMSE#PBF?
LT3980EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3980EMSE#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 LT3980EMSE#PBF?
For technical support, including LT3980EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3980EMSE#PBF requirements.
6.How does Aetrix verify that LT3980EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3980EMSE#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 LT3980EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3980EMSE#PBF?
All LT3980EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3980EMSE#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 LT3980EMSE#PBF part is unused and in its original packaging.
Return procedure for LT3980EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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