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Analog Devices Inc. LT3980EDE#TRPBF
- Part No.:
- LT3980EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LT3980EDE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 14DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT3980EDE#TRPBF 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 driver, and catch-diode current sense (DA pin) for transient protection-used in automotive battery regulation, industrial distributed supplies, and wide-input wall transformer designs.
For engineers reviewing the LT3980EDE#TRPBF datasheet, LT3980EDE#TRPBF pinout, LT3980EDE#TRPBF application, or LT3980EDE#TRPBF equivalent, key selection criteria include its 58V max input/80V transient rating, thermal shutdown, power good flag, soft-start via RUN/SS, and compatibility with 3mm × 4mm DFN-14 package layouts requiring minimal external components.
Technical Context
The LT3980EDE#TRPBF employs constant-frequency current-mode PWM control with oscillator frequency set by an external RT resistor (100kHz–2.4MHz), enabling fast transient response and stable loop behavior across wide input ranges. Its internal error amplifier drives the VC pin to regulate peak switch current, while active clamp and RUN/SS voltage ramping implement precise soft-start and current limiting.
It features dual protection architecture: overvoltage lockout triggers at 58V (min), disabling switching up to 80V transients; DA pin monitors catch diode current to pause oscillation during short-circuit or input overvoltage events. Bias current sourcing from VOUT (>3V) reduces no-load IQ to 85µA, and low-ripple Burst Mode® maintains output ripple <15mVP-P at light loads.
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 rails or automotive batteries. |
| Max Output Current | 2A DC load capability-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/dropout (low-freq). |
| Feedback Voltage | 790mV ±10mV (typ.)-sets precise output regulation with standard resistor divider networks. |
| Power Good Threshold | 91% of programmed VOUT with 14mV hysteresis-provides reliable system power sequencing signal. |
| Thermal Shutdown | Activates at TJ ≥165°C-protects against sustained overload or poor PCB heatsinking. |
| Package | 3mm × 4mm, 14-pin DFN with exposed pad-offers θJA = 45°C/W for high-power density thermal management. |
Pinout & Package
LT3980EDE#TRPBF is housed in a thermally enhanced 14-pin (3mm × 4mm) plastic DFN package with exposed GND pad (Pin 15) requiring PCB soldering for optimal thermal performance. Pin count and layout match the DE14 footprint defined in Linear Technology's packaging specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DA (Pin 14) | Catch diode current sense input | Pauses oscillator during overcurrent to limit inductor current-critical for input transient and short-circuit robustness. |
| VIN (Pin 12) | Main power input | Supplies internal regulator and switch; rated to 80V absolute max-must be locally bypassed with ≥10µF ceramic capacitor. |
| SW (Pin 11) | Switch node | Connects to inductor, catch diode cathode, and boost capacitor-carries high di/dt switching current; requires tight layout. |
| BOOST (Pin 10) | Boost drive output | Provides >VIN voltage to saturate internal NPN switch; requires external Schottky diode + capacitor (e.g., 10nF). |
| BD (Pin 9) | Boost diode anode supply | Sources bias current for internal regulator; can draw from VOUT (>3V) to reduce IQ in light-load operation. |
| RUN/SS (Pin 8) | Enable & soft-start control | Pull ≥2.5V to enable; tie RC network for controlled VOUT ramp-prevents inrush and enables sequencing. |
| RT (Pin 6) | Oscillator frequency set | Resistor-to-GND sets fSW; e.g., 32.4kΩ yields 1MHz-determines minimum on/off time constraints and VIN/VOUT ratio limits. |
| FB (Pin 4) | Feedback input | Regulated to 790mV; connects to resistor divider tap-defines output voltage accuracy and loop stability point. |
| PG (Pin 3) | Power good open-collector output | Active-low flag signaling VOUT ≥91% of target-requires external pull-up for microcontroller reset or status monitoring. |
| GND (Pins 7,15) | Ground reference & thermal path | Exposed pad (Pin 15) must be soldered to large copper area-primary thermal conduction path to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Low-ripple Burst Mode® operation | Maintains <15mVP-P output ripple at light loads while achieving 85µA IQ-eliminates need for external LDO post-regulation in battery-powered systems. |
| Catch diode current sensing (DA pin) | Real-time monitoring of diode conduction enables immediate oscillator pause during overcurrent-prevents thermal runaway without external sense resistors. |
| Output bias current sourcing | Draws operating current from VOUT when >3V, reducing VIN supply current at light loads-improves system-level efficiency in always-on applications. |
| Programmable soft-start | Controlled VOUT ramp via RC network on RUN/SS-ensures monotonic startup and prevents output overshoot in multi-rail systems. |
| Overvoltage lockout (OVL) | Disables switching at VIN ≥58V (min), sustaining up to 80V transients-protects downstream circuitry in 48V automotive or industrial environments. |
| Power good flag with hysteresis | Open-drain PG asserts when FB reaches 91% of target with 14mV hysteresis-provides clean, noise-immune sequencing signal for FPGAs or processors. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: Regulating 12V/24V/48V vehicle battery rails to 3.3V or 5V for infotainment ECUs and ADAS sensors under cold-crank (4.5V) and load-dump (80V) conditions. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, protected, and sequenced power with OVL and DA-based fault response. Use Value: Eliminates need for external TVS and pre-regulator stages-reduces BOM count and improves reliability in AEC-Q100-compliant designs. |
Use Scenario: Local 5V/3.3V generation from 24–48V backplane in programmable logic controllers (PLCs) and industrial I/O modules with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: High-efficiency, thermally robust point-of-load regulator supporting 2A loads in space-constrained DIN-rail enclosures. Use Value: 3mm × 4mm DFN package with exposed pad enables >2A operation without heatsinks-reducing system footprint and assembly cost. |
| Industrial Supplies | Wall Transformer Regulation |
Use Scenario: Converting unregulated 36–58V DC from industrial power supplies to stable 5V for fieldbus gateways and motor drive control logic. IC Role / Device Role / Timing Role: Wide-input buck controller with programmable fSW and soft-start-ensuring compatibility with legacy 48V infrastructure and safety-certified transformers. Use Value: Adjustable frequency allows optimization for EMI compliance (e.g., 400kHz) while maintaining >90% efficiency at full load-meeting IEC 61000-3-2 requirements. |
Use Scenario: Replacing linear regulators in universal-input (90–264V AC) wall adapters delivering 5V/2A DC output with low no-load consumption. IC Role / Device Role / Timing Role: High-voltage input buck IC accepting rectified DC bus (up to 58V) with ultra-low 85µA IQ in standby. Use Value: Meets DOE Level VI and EU CoC Tier 2 no-load power requirements (<100mW) without auxiliary winding or complex control-simplifying certification. |
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 1.2MHz fSW, no DA pin or OVL above 40V | Lower voltage/current capability; lacks catch-diode current sensing and 80V transient tolerance | Choose for cost-sensitive 24V systems where 58V/80V rating is unnecessary and smaller solution size is prioritized. |
| MPQ4332GJ-AEC1-P | 60V max input, 2A, integrated MOSFETs, 2.2MHz fSW, AEC-Q100 Grade 1, no DA pin | Automotive-qualified but lacks DA-based transient protection and programmable soft-start via RUN/SS | Prefer for automotive production where AEC-Q100 compliance is mandatory and external fault detection is acceptable. |
Compared with LTC3631EMSE#PBF and MPQ4332GJ-AEC1-P, the LT3980EDE#TRPBF uniquely combines 58V/80V ruggedness, DA pin overcurrent pausing, and programmable soft-start in a 3mm × 4mm DFN-making it optimal for industrial and automotive designs demanding both high input resilience and precise fault management without added components.
Availability
LT3980EDE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supplies, and wall transformer regulation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT3980EDE#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 rugged, high-voltage buck regulators targeting applications with wide input ranges, harsh transients, and stringent reliability requirements-designed for automotive, industrial, and telecom infrastructure power systems.
FAQ
What is the maximum input voltage rating for LT3980EDE#TRPBF?
The LT3980EDE#TRPBF has a continuous maximum input voltage of 58V and can withstand non-repetitive 80V transients for up to one minute. Operation above 58V (minimum specification) disables switching to protect internal circuitry, making it suitable for 48V automotive and industrial systems experiencing load dump or cold-crank events.
How does the DA pin function in LT3980EDE#TRPBF?
The DA pin on the LT3980EDE#TRPBF senses catch diode current and pauses the oscillator during overcurrent conditions-such as input transients or output shorts-to prevent inductor saturation and thermal damage. This feature eliminates the need for external current-sense resistors or protection ICs in robust power designs.
Can LT3980EDE#TRPBF operate efficiently at very light loads?
Yes, the LT3980EDE#TRPBF uses low-ripple Burst Mode® operation to maintain 85µA quiescent current at 12VIN → 3.3VOUT, keeping output ripple below 15mVP-P. It further reduces input current by drawing bias from VOUT when above 3V-ideal for battery-backed or always-on IoT nodes.
What package type and thermal characteristics does LT3980EDE#TRPBF use?
The LT3980EDE#TRPBF is supplied in a 3mm × 4mm, 14-pin plastic DFN package (DE14) with exposed GND pad (Pin 15). Its thermal resistance is θJA = 45°C/W and θJC = 10°C/W-requiring the exposed pad to be soldered to a large PCB copper area for effective heat dissipation at 2A continuous load.
Does LT3980EDE#TRPBF support synchronization to an external clock?
Yes, the LT3980EDE#TRPBF supports external clock synchronization via the SYNC pin (Pin 1), accepting clock signals from 250kHz to 2MHz with rise/fall times faster than 1µs. This enables EMI reduction through frequency dithering or alignment with system clocks in multi-rail power architectures.
LT3980EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN 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:
- 14-DFN (4x3)
LT3980EDE#TRPBF FAQ
1.How can I place an order for LT3980EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3980EDE#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 LT3980EDE#TRPBF reliable?
The price and inventory of LT3980EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3980EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3980EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3980EDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3980EDE#TRPBF?
LT3980EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3980EDE#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 LT3980EDE#TRPBF?
For technical support, including LT3980EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3980EDE#TRPBF requirements.
6.How does Aetrix verify that LT3980EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3980EDE#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 LT3980EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3980EDE#TRPBF?
All LT3980EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3980EDE#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 LT3980EDE#TRPBF part is unused and in its original packaging.
Return procedure for LT3980EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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