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Analog Devices Inc. LT3980HMSE#TRPBF
- Part No.:
- LT3980HMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3980HMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,785
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Product details
Overview
LT3980HMSE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, current-mode synchronous step-down DC/DC regulator IC with 58V max input, 2A output, 2.4MHz adjustable switching frequency, 85µA quiescent current in Burst Mode, and –40°C to 150°C operating junction temperature. It integrates a 200mΩ NPN switch, boost Schottky diode driver, and catch-diode current sense (DA pin) for transient overcurrent protection-used in automotive battery regulation and industrial wide-input power supplies.
For engineers reviewing the LT3980HMSE#TRPBF datasheet, LT3980HMSE#TRPBF pinout, LT3980HMSE#TRPBF application, or LT3980HMSE#TRPBF equivalent, key selection criteria include its 58V input rating with 80V transient tolerance, thermal-grade H-temp MSOP package, low-ripple Burst Mode operation (<15mVP-P), power-good flag, and synchronization capability from 250kHz to 2MHz.
Technical Context
The LT3980HMSE#TRPBF employs fixed-frequency current-mode control with external RT-resistor programmability (100kHz–2.4MHz), enabling precise loop stability and fast transient response. Its internal bipolar NPN switch is driven via BOOST pin with external Schottky diode, requiring minimum on-time (~200ns) and off-time (~230ns) constraints that govern practical VIN/VOUT ratios and frequency trade-offs.
Catch diode current sensing at the DA pin pauses oscillation during overcurrent or input transients, while VC pin error amplifier output directly controls peak switch current. Bias current sourcing from VOUT (>3V) reduces quiescent consumption, and RUN/SS pin enables soft-start and <1µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 58V continuous; withstands 80V non-repetitive transients-supports 24V/48V industrial and 12V automotive battery inputs with headroom. |
| Output Current | 2A maximum continuous-sustains full load across –40°C to 150°C junction range without derating. |
| Switching Frequency | Adjustable 100kHz to 2.4MHz via RT resistor-enables compact magnetics at high fSW, or higher efficiency/lower dropout at low fSW. |
| Quiescent Current | 85µA at 12VIN → 3.3VOUT in Burst Mode-maintains ultra-low standby power without sacrificing <15mVP-P output ripple. |
| Feedback Voltage | 790mV ±10mV (typical)-sets output voltage accuracy; enables precise 3.3V, 5V, or adjustable rails using standard 1% resistors. |
| Power Good Threshold | 91% of regulated VOUT with 14mV hysteresis-provides reliable system power sequencing and fault detection. |
| Thermal Rating | Junction temperature range –40°C to +150°C-qualified for under-hood automotive and high-ambient industrial environments. |
Pinout & Package
LT3980HMSE#TRPBF is housed in a thermally enhanced 16-lead plastic MSOP package (MSE) with exposed pad (Pin 17 = GND) for low θJA = 45°C/W. Pin count, layout, and thermal pad soldering are identical to LT3980EMSE/IMSE variants but rated for extended junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | External clock input | Synchronizes switching to external source (250kHz–2MHz); tie to GND for Burst Mode or >0.8V for pulse-skipping. |
| 2 (PG) | Open-collector power-good flag | Sinks current when VOUT reaches 91% of target-valid only if VIN > 3.6V and RUN/SS high. |
| 4 (FB) | Feedback input | Regulated to 790mV; connects to resistor divider tap-determines output voltage with ±1% typical accuracy. |
| 6 (VC) | Error amplifier output | Controls peak switch current; RC compensation network here stabilizes control loop bandwidth and phase margin. |
| 7 (RT) | Oscillator frequency set | Resistor to GND programs fSW (100kHz–2.4MHz); e.g., 32.4kΩ yields ~1.07MHz per datasheet Figure 1. |
| 8 (RUN/SS) | Enable & soft-start control | Tie ≥2.5V to enable; RC ramp here provides controlled VOUT rise time-reduces inrush and EMI. |
| 9 (BD) | Boost diode anode connection | Supplies bias current to internal regulator; connects to Schottky diode anode-enables efficient switch saturation. |
| 10 (BOOST) | Switch drive voltage supply | Provides >VIN voltage to NPN base-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; requires tight layout. |
| 12 (VIN) | Main power input | Supplies internal regulator and switch; must be locally bypassed with ≥10µF X7R ceramic-handles up to 58V continuous. |
| 14 (DA) | Catch diode current sense | Monitors diode conduction; pauses oscillator during overcurrent or input transients-protects inductor and switch. |
| 15 (GND) | Signal ground | Reference for FB, VC, RT, PG; connects to exposed pad-must be solidly soldered to PCB plane for thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | Operates from 3.6V to 58V with 80V transient tolerance-eliminates need for pre-regulators in 24V/48V systems. |
| Low-ripple Burst Mode | Maintains <15mVP-P output ripple at light loads while drawing only 85µA IQ-ideal for always-on subsystems. |
| Catch diode current sense | DA pin detects reverse recovery and overcurrent events-pauses switching to prevent inductor saturation and thermal runaway. |
| Output bias current sourcing | Draws bias from VOUT when >3V-reduces total input current and improves light-load efficiency without external circuitry. |
| Thermally robust packaging | 16-pin MSOP with exposed GND pad (θJC = 10°C/W)-delivers full 2A output at 150°C junction without airflow or heatsink. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
|
Use Scenario: Powering infotainment, ADAS sensors, and body control modules from 12V vehicle battery with cold-crank (4.5V) and load-dump (60V) transients. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3V/5V rails; DA pin protects against load-dump-induced diode stress. Use Value: Eliminates need for external TVS or pre-regulator-58V rating and 80V transient tolerance ensure uninterrupted operation during harsh automotive events. |
Use Scenario: Local point-of-load conversion in factory automation PLCs where 24V or 48V backplane supplies multiple isolated subsystems. IC Role / Device Role / Timing Role: High-efficiency step-down converter delivering 2A at 5V/12V; SYNC pin enables system-wide clock alignment to reduce EMI. Use Value: Adjustable 100kHz–2.4MHz fSW allows optimization for size (high fSW) or efficiency (low fSW) per subsystem requirement. |
| Industrial Supplies | Wall Transformer Regulation |
|
Use Scenario: Replacing linear regulators in industrial HMIs and motor drives where ambient temperatures exceed 85°C. IC Role / Device Role / Timing Role: High-temperature buck controller maintaining 2A output up to 150°C junction-H-grade qualification ensures reliability in sealed enclosures. Use Value: Full 2A capability without derating at 150°C eliminates thermal design overhead and enables smaller heatsinks or no heatsink. |
Use Scenario: Regulating unregulated 12–36V DC outputs from wall adapters into clean 3.3V/5V for IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: Low-noise, low-ripple buck converter with soft-start (RUN/SS) and power-good (PG) for safe system boot-up. Use Value: 85µA Burst Mode IQ extends battery backup runtime; PG signal confirms rail stability before MCU wake-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3639EMSE#PBF | 40V max input, 2A, integrated MOSFETs, 3mm × 4mm DFN-lacks DA pin protection and 58V rating. | Better suited for space-constrained 24V systems; not rated for 48V+ or automotive transients. | Select LTC3639EMSE#PBF only if input stays ≤40V and DA-based transient protection is unnecessary. |
| LM5164QPWPRQ1 | 65V max input, 1A, 1.5MHz fixed fSW, SOIC-10-no adjustable frequency, no DA pin, lower current, AEC-Q100 qualified. | Designed for automotive but limited to 1A; lacks programmable fSW and catch-diode sensing for high-stress transients. | Choose LM5164QPWPRQ1 for AEC-Q100 compliance in ≤1A automotive apps where DA protection is secondary. |
Compared with LTC3639EMSE#PBF and LM5164QPWPRQ1, the LT3980HMSE#TRPBF uniquely combines 58V input, 2A output, DA pin overcurrent protection, and –40°C to 150°C operation-making it the only option for ruggedized 48V industrial or under-hood automotive designs demanding full 2A at high ambient.
Availability
LT3980HMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and high-temperature embedded systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT3980HMSE#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, serving industrial, automotive, communications, and healthcare markets.
The LT3980 product line delivers high-voltage monolithic buck regulators optimized for rugged environments-designed specifically for automotive, industrial, and telecom applications where wide input range, transient robustness, and extended temperature operation are critical.
FAQ
What is the maximum input voltage rating for LT3980HMSE#TRPBF, and how does it handle transients?
The LT3980HMSE#TRPBF has a continuous maximum input voltage of 58V and is rated to withstand non-repetitive 80V transients for up to one minute. Internal overvoltage lockout disables switching above ~61.5V (typical) to protect downstream circuitry, while the DA pin actively monitors catch diode current to pause the oscillator during overcurrent events caused by transients-ensuring safe operation without external protection components.
Does LT3980HMSE#TRPBF require an external Schottky diode, and what is its role?
Yes, LT3980HMSE#TRPBF requires an external Schottky diode connected between BD (anode) and SW (cathode). This diode charges the BOOST capacitor, generating a voltage higher than VIN to fully saturate the internal bipolar NPN switch-reducing conduction losses and enabling high efficiency across the full 3.6V–58V input range. The datasheet specifies Diodes Inc. SBR3U100LP as a validated option.
How does the DA pin function in LT3980HMSE#TRPBF, and why is it critical for reliability?
The DA pin in LT3980HMSE#TRPBF senses current flowing through the external catch diode. When diode current exceeds ~2.4A, the oscillator is paused-preventing inductor saturation and switch overstress during input transients or short-circuit conditions. This real-time protection is critical for reliability in automotive and industrial applications where uncontrolled overcurrent could cause thermal failure or system shutdown.
What is the significance of the "H" grade in LT3980HMSE#TRPBF, and how does it differ from E/I grades?
"H" grade indicates that LT3980HMSE#TRPBF is specified and tested for operation from –40°C to +150°C junction temperature-unlike E (0°C to 125°C) or I (–40°C to 125°C) grades. This extended rating is achieved through process and test validation, enabling use in under-hood automotive, high-ambient industrial, and sealed enclosure applications where thermal derating would otherwise limit output current.
Can LT3980HMSE#TRPBF synchronize to an external clock, and what is its synchronization range?
Yes, LT3980HMSE#TRPBF supports external clock synchronization via the SYNC pin (Pin 1). It accepts TTL/CMOS-compatible clock signals from 250kHz to 2MHz-allowing system-level EMI reduction through frequency alignment. Clock edges must have rise/fall times faster than 1µs. If unused, SYNC must be tied to GND to enable low-ripple Burst Mode operation.
LT3980HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3980HMSE#TRPBF FAQ
1.How can I place an order for LT3980HMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3980HMSE#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 LT3980HMSE#TRPBF reliable?
The price and inventory of LT3980HMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3980HMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3980HMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3980HMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3980HMSE#TRPBF?
LT3980HMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3980HMSE#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 LT3980HMSE#TRPBF?
For technical support, including LT3980HMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3980HMSE#TRPBF requirements.
6.How does Aetrix verify that LT3980HMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3980HMSE#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 LT3980HMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3980HMSE#TRPBF?
All LT3980HMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3980HMSE#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 LT3980HMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3980HMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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