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Analog Devices Inc. LT3980EDE#PBF
- Part No.:
- LT3980EDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LT3980EDE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,688
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Product details
Overview
LT3980EDE#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 bipolar 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 LT3980EDE#PBF datasheet, LT3980EDE#PBF pinout, LT3980EDE#PBF application, or LT3980EDE#PBF equivalent, key selection considerations include its 58V max continuous input (80V transient), thermal shutdown, power good flag, soft-start via RUN/SS, and compatibility with 3mm × 4mm DFN-14 package with exposed GND pad.
Technical Context
The LT3980EDE#PBF employs constant-frequency current-mode PWM control with internal error amplifier output on VC pin, RT-programmable oscillator, and active clamp-based current limiting. Its DA pin monitors catch diode current to pause switching during overcurrent or input transients, enabling robust operation at high VIN/VOUT ratios.
It supports low-noise Burst Mode® operation (output ripple <15mVP-P) and bias sourcing from VOUT when >3V-reducing IQ to 85µA at 12VIN→3.3VOUT. The BOOST pin drives an external capacitor-diode network to supply >VIN gate drive for full saturation of the internal bipolar switch.
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 36V automotive batteries. |
| Max Output Current | 2A DC load-supports mid-power point-of-load conversion without external MOSFETs. |
| Quiescent Current | 85µA in Burst Mode® at 12VIN→3.3VOUT-extends battery life in always-on systems. |
| Switching Frequency | 100kHz to 2.4MHz (RT-programmable)-allows trade-off between inductor size (high-freq) and efficiency/dropout (low-freq). |
| Feedback Reference | 790mV ±10mV over temperature-sets precise output voltage with standard resistor divider. |
| Power Good Threshold | 91% of regulated VOUT with 14mV hysteresis-provides reliable system power sequencing signal. |
| Thermal Shutdown | Activates at TJ ≥165°C, auto-recovery-protects against sustained overload or poor PCB heatsinking. |
Pinout & Package
LT3980EDE#PBF is housed in a thermally enhanced 14-lead (3mm × 4mm) plastic DFN package with exposed GND pad (Pin 15), θJA = 45°C/W, θJC = 10°C/W. The exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DA (Pin 14) | Catch diode current sense input | Pauses oscillator during overcurrent or input overvoltage-prevents inductor saturation and switch failure. |
| VIN (Pin 12) | Main input supply | Supplies internal regulator and switch; rated 80V absolute max (non-repetitive); bypass with ≥10µF ceramic capacitor. |
| SW (Pin 11) | Switch node | Connects to inductor, catch diode cathode, and boost capacitor-carries high di/dt pulsed current. |
| BOOST (Pin 10) | Boost drive output | Drives external Schottky diode/capacitor to generate >VIN voltage for full NPN switch saturation. |
| BD (Pin 9) | Boost diode anode connection | Provides bias current path for internal regulator; enables VOUT-sourced bias when VOUT >3V. |
| RUN/SS (Pin 8) | Enable & soft-start control | Pull ≥2.5V to enable; tie RC network for controlled VOUT ramp; pull ≤0.4V to shut down (<1µA IQ). |
| RT (Pin 6) | Oscillator frequency set | Resistor to GND programs fSW from 100kHz to 2.4MHz-determines inductor size and efficiency trade-offs. |
| FB (Pin 4) | Feedback input | Regulated to 790mV; connects to resistor divider tap-defines output voltage with ±1.3% accuracy over temp. |
| PG (Pin 3) | Power good open-collector | Sinks ≥200µA when VOUT <91% of target-signals valid regulation to host controller or sequencer. |
| GND (Pins 7,15) | Signal & power ground | Exposed pad (Pin 15) is GND-must be soldered to large PCB copper area for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains <15mVP-P output ripple and 85µA IQ at light loads-eliminates need for external LDO in standby paths. |
| Catch diode current sensing | DA pin detects reverse recovery and short-circuit events-enables cycle-by-cycle protection without external sense resistor. |
| Integrated boost diode driver | Eliminates external bootstrap components-simplifies layout and improves reliability in high-VIN applications. |
| Overvoltage lockout | Disables switching above 58V (min), clamping safe operation up to 80V transients-no external TVS required for ISO 7637-2 pulse 5a. |
| Soft-start via RUN/SS | RC-controlled voltage ramp on RUN/SS pin limits inrush current and prevents output overshoot during startup. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: 24V/48V vehicle battery powering infotainment display and ADAS sensors. IC Role / Device Role / Timing Role: Primary buck converter delivering stable 5V/3.3V from unregulated battery rail with cold-crank (4.5V) and load-dump (80V) immunity. Use Value: 85µA IQ extends ECU sleep mode battery life; DA pin protection avoids field failures during jump-start transients. |
Use Scenario: Industrial PLC backplane supplying multiple I/O modules with varying load profiles. IC Role / Device Role / Timing Role: Point-of-load regulator converting 24V bus to 5V for microcontrollers and communication interfaces. Use Value: Adjustable fSW allows optimization for compact 2.2µH inductors; PG flag enables coordinated module power-up sequencing. |
| Industrial Supplies | Wall Transformer Regulation |
Use Scenario: Factory automation controller requiring 12V/2A from 48V PoE++ or DC distribution bus. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating continuously at full load with thermal margin. Use Value: 200mΩ switch and exposed-pad DFN enable >90% efficiency at 48VIN→12VOUT/2A without heatsink. |
Use Scenario: Universal-input AC/DC adapter output stage regulating 12V/2A from rectified 36–60V DC bus. IC Role / Device Role / Timing Role: Secondary-side DC/DC controller replacing linear regulators in compact wall-wart designs. Use Value: 3mm × 4mm DFN footprint saves board space vs. legacy controllers; Burst Mode® eliminates audible noise at no-load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE#PBF | 40V max VIN, 1.5A output, fixed 1.2MHz fSW, no DA pin, lower IQ (25µA) | Better suited for space-constrained 24V systems where 80V transients are absent | Select if input never exceeds 40V and lowest possible IQ is critical; not drop-in due to different pinout and missing DA protection. |
| MP2451DT-LF-Z | 36V max VIN, 0.6A output, integrated MOSFETs, no PG or DA, 1.2MHz fixed fSW | Cost-optimized for low-current consumer electronics with limited transient immunity | Choose only for <1A loads and benign 24V inputs; lacks automotive-grade OVP, PG, and catch-diode sensing. |
Compared with LTC3630EMSE#PBF and MP2451DT-LF-Z, the LT3980EDE#PBF uniquely combines 58V operation, 2A capability, DA-based transient protection, and programmable frequency-making it the only option among the three qualified for 48V industrial and automotive battery front-end regulation.
Availability
LT3980EDE#PBF 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 (–40°C to 125°C) and long production lifecycles.
Supply support for LT3980EDE#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 and maintains full product support, documentation, and manufacturing continuity for the LT® series.
The LT3980 belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for ruggedized DC/DC conversion in automotive, industrial, and telecom infrastructure where wide input range and transient robustness are mandatory.
FAQ
What is the maximum continuous input voltage rating for the LT3980EDE#PBF?
The LT3980EDE#PBF has a maximum continuous input voltage rating of 58V, with absolute maximum rating of 80V for non-repetitive 1-minute transients. Operation above 58V (typical OVLO threshold 61.5V) disables switching to protect downstream circuitry-verified per Absolute Maximum Ratings table and Electrical Characteristics section of the datasheet.
Does the LT3980EDE#PBF require an external catch diode?
No, the LT3980EDE#PBF does not require an external catch diode. It integrates a boost Schottky diode driver (BD/BOOST pins) and relies on an external Schottky diode placed between BD and SW to form the bootstrap circuit-but the power path uses synchronous rectification via its internal bipolar NPN switch, eliminating the need for a separate catch diode in the main current path.
How does the DA pin function in the LT3980EDE#PBF?
The DA pin on the LT3980EDE#PBF senses current through the external boost Schottky diode and pauses the oscillator during overcurrent conditions-including input voltage transients and short-circuit events. This protects the internal switch by preventing inductor current runaway, and is confirmed in the Pin Functions and Applications Information sections of the datasheet.
What package type and thermal characteristics apply to the LT3980EDE#PBF?
The LT3980EDE#PBF uses a 14-lead 3mm × 4mm plastic DFN package (DE14) with exposed GND pad (Pin 15). Its thermal resistance is θJA = 45°C/W and θJC = 10°C/W-requiring soldering of the exposed pad to a minimum 200mm² PCB copper area for optimal junction temperature control under 2A load.
Can the LT3980EDE#PBF operate in Burst Mode® below 100kHz?
No, the LT3980EDE#PBF cannot operate in Burst Mode® below 100kHz. Its minimum programmable switching frequency is 100kHz (set by RT = 432kΩ), and Burst Mode® is only active within the specified 100kHz–2.4MHz operating range-confirmed in the Features list and Electrical Characteristics table where fSW min = 100kHz is guaranteed over temperature.
LT3980EDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN 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:
- 14-DFN (4x3)
LT3980EDE#PBF FAQ
1.How can I place an order for LT3980EDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3980EDE#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 LT3980EDE#PBF reliable?
The price and inventory of LT3980EDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3980EDE#PBF is usually 5 days.
3.What payment methods are accepted for LT3980EDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3980EDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3980EDE#PBF?
LT3980EDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3980EDE#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 LT3980EDE#PBF?
For technical support, including LT3980EDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3980EDE#PBF requirements.
6.How does Aetrix verify that LT3980EDE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3980EDE#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 LT3980EDE#PBF meets industry standards.
7.What is the process for return or replacement of LT3980EDE#PBF?
All LT3980EDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3980EDE#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 LT3980EDE#PBF part is unused and in its original packaging.
Return procedure for LT3980EDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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