My Inquiry
My Account
Analog Devices Inc. LT3980IDE#PBF
- Part No.:
- LT3980IDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LT3980IDE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,227
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3980IDE#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 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 LT3980IDE#PBF datasheet, LT3980IDE#PBF pinout, LT3980IDE#PBF application, or LT3980IDE#PBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world efficiency data at 12V/24V/48V input, soft-start implementation details, and validated alternative parts for high-voltage buck designs requiring low IQ and robust overvoltage protection.
Technical Context
The LT3980IDE#PBF employs constant-frequency current-mode PWM control with internal error amplifier servoing VC to regulate FB at 790mV ±18mV. Its oscillator supports RT-programmable frequency (100kHz–2.4MHz) and includes frequency foldback during startup/overload to limit peak inductor current.
It features dual bias paths: VIN-powered internal regulator (3.6V–58V operation), plus BD-pin-assisted bias draw from VOUT when >3V-reducing no-load IQ to 85µA. Catch diode current sensing on DA pin pauses oscillation during short-circuit or input overvoltage transients up to 80V.
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 single-rail power for FPGAs, microcontrollers, or sensor signal chains without external current boosting. |
| 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 Voltage | 790mV ±18mV over –40°C to 125°C-ensures stable output regulation across automotive and industrial temperature ranges. |
| Power Good Flag | Open-collector PG asserts when VOUT reaches 91% of programmed value-provides reliable system reset sequencing. |
| Thermal Protection | Internal thermal shutdown with automatic recovery-prevents damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
LT3980IDE#PBF is housed in a 14-lead (3mm × 4mm) plastic DFN package with exposed pad (Pin 15 = GND), 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 events-protects inductor and switch under short-circuit or input overvoltage conditions. |
| VIN (Pin 12) | Main input supply | Accepts 3.6V–58V; powers internal regulator and switch-requires local 10µF ceramic bypass near pin. |
| SW (Pin 11) | Switch node | Connects to inductor, catch diode cathode, and boost capacitor-carries high di/dt switching current. |
| BOOST (Pin 10) | Boost drive voltage | Provides >VIN voltage to saturate internal NPN switch-requires external Schottky diode and capacitor. |
| BD (Pin 9) | Boost diode anode connection | Supplies current to internal bias regulator-enables VOUT-derived bias when VOUT > 3V for ultra-low IQ. |
| RUN/SS (Pin 8) | Enable & soft-start control | Pull ≥2.5V to enable; RC network here sets controlled VOUT ramp-prevents inrush current and output overshoot. |
| RT (Pin 6) | Oscillator frequency set | Resistor to GND programs fSW from 100kHz–2.4MHz-determines inductor size, efficiency, and input voltage range limits. |
| FB (Pin 4) | Feedback input | Regulated to 790mV; connects to resistor divider-sets VOUT = 0.79V × (1 + R1/R2) with <0.01%/V line regulation. |
| PG (Pin 3) | Power good flag | Open-collector output active low until VOUT ≥ 91% of target-valid only when VIN > 3.6V and RUN/SS high. |
| GND (Pins 7, 15) | Ground reference | Primary return path for control circuitry and power switch-exposed pad (Pin 15) must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains <15mVP-P output ripple at light loads while holding IQ = 85µA-ideal for battery-powered remote sensors. |
| Catch diode current sense (DA) | Real-time monitoring of catch diode conduction-enables immediate oscillator pause during input transients or short circuits. |
| Overvoltage lockout | Disables switching at VIN > 58V (min), protecting downstream circuitry during load dump or alternator surge events. |
| Synchronizable frequency | SYNC pin accepts external clock (250kHz–2MHz)-eliminates beat frequencies in multi-regulator systems. |
| Thermally enhanced DFN | 3mm × 4mm footprint with exposed GND pad-delivers 10°C/W junction-to-case thermal resistance for 2A continuous operation. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: Powering infotainment head units and ADAS cameras from 12V vehicle battery with load dump immunity. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck converter with 80V transient tolerance and programmable soft-start. Use Value: Eliminates need for external TVS or pre-regulator; maintains regulation during cold-crank (down to 3.6V) and load dump (up to 80V). |
Use Scenario: Local point-of-load conversion in factory automation PLCs with 24V/48V backplane supplies. IC Role / Device Role / Timing Role: High-efficiency 5V/2A regulator for FPGA I/O banks and isolated communication interfaces. Use Value: Delivers 85%+ efficiency at 48VIN→5VOUT/2A with minimal heatsinking due to 200mΩ switch and thermally optimized DFN. |
| Industrial Supplies | Wall Transformer Regulation |
Use Scenario: Replacing linear regulators in DIN-rail mounted power modules requiring wide input range and low standby power. IC Role / Device Role / Timing Role: Adjustable-output buck controller supporting 3.3V–12V outputs with precise 790mV feedback reference. Use Value: Reduces thermal design burden vs. LDOs; achieves <1µA shutdown current for energy metering sleep modes. |
Use Scenario: Universal-input AC/DC adapter secondary-side regulation for IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: 58V-rated buck IC accepting rectified 36V–56V DC from offline flyback stages. Use Value: Enables compact, high-density designs by eliminating bulky input filter capacitors needed for lower-voltage buck ICs. |
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, 3A output, integrated MOSFETs, 3.5µA IQ in shutdown-lacks 58V rating and DA-pin transient protection. | Better suited for 24V industrial rails where 58V tolerance is unnecessary; smaller solution size due to integrated FETs. | Select LTC3639EMSE#PBF when input stays ≤40V and higher output current is required; retain LT3980IDE#PBF for 48V+ battery or load-dump-prone environments. |
| MPQ4332GJ-AEC1-P | 60V max input, 2A output, 2.2MHz fixed frequency, AEC-Q200 qualified-no adjustable frequency, no DA pin, higher 120µA IQ. | Designed specifically for automotive ECU power rails; lacks programmable soft-start and burst-mode ripple control. | Choose MPQ4332GJ-AEC1-P for production automotive programs requiring AEC-Q200; use LT3980IDE#PBF for prototyping, industrial, or non-automotive 58V applications needing design flexibility. |
Compared with LTC3639EMSE#PBF and MPQ4332GJ-AEC1-P, the LT3980IDE#PBF uniquely combines 58V operation, DA-pin transient protection, adjustable frequency, and 85µA Burst Mode® IQ-making it optimal for ruggedized industrial and non-automotive high-voltage buck designs where reliability under transients and low-noise light-load performance are critical.
Availability
LT3980IDE#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 LT3980IDE#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 with deep expertise in precision regulation and robust power conversion.
The LT3980IDE#PBF belongs to Linear's high-voltage monolithic buck regulator product line, engineered for demanding applications including automotive, industrial, and telecom power systems where wide input range, transient resilience, and low quiescent current are essential.
FAQ
What is the absolute maximum input voltage rating for the LT3980IDE#PBF?
The LT3980IDE#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 ~61.5V typical to disable switching and protect downstream circuitry. This makes the LT3980IDE#PBF suitable for 48V battery systems experiencing load dump or alternator surges.
How does the DA pin on the LT3980IDE#PBF improve system reliability?
The DA pin on the LT3980IDE#PBF monitors catch diode current and pauses the oscillator during overcurrent events-including short circuits and input overvoltage transients. This prevents inductor saturation and switch overstress, maintaining safe peak currents even at high switching frequencies. It is a key differentiator for ruggedized designs where transient immunity is critical.
Can the LT3980IDE#PBF operate efficiently at very light loads?
Yes-the LT3980IDE#PBF uses low-ripple Burst Mode® operation to maintain 85µA quiescent current at 12VIN→3.3VOUT, keeping output ripple below 15mVP-P. It further improves light-load efficiency by drawing bias current from VOUT when above 3V. This behavior is confirmed in Figure 2 of the LT3980 datasheet and enables multi-year battery life in always-on sensor nodes.
What package type and thermal characteristics does the LT3980IDE#PBF have?
The LT3980IDE#PBF uses a 14-lead 3mm × 4mm plastic DFN package with exposed thermal pad (Pin 15 = GND). Its thermal resistance is θJA = 45°C/W and θJC = 10°C/W. The exposed pad must be soldered to a PCB ground plane to achieve rated 2A continuous output current and prevent thermal shutdown under full load.
Does the LT3980IDE#PBF support synchronization to an external clock?
Yes-the LT3980IDE#PBF includes a SYNC pin (Pin 1) that accepts external clock signals from 250kHz to 2MHz. Clock edges must have rise/fall times faster than 1µs. When not used, SYNC must be tied to GND to ensure low-ripple Burst Mode® operation. This feature enables noise-sensitive systems to avoid beat frequencies in multi-rail power architectures.
LT3980IDE#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)
LT3980IDE#PBF FAQ
1.How can I place an order for LT3980IDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3980IDE#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 LT3980IDE#PBF reliable?
The price and inventory of LT3980IDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3980IDE#PBF is usually 5 days.
3.What payment methods are accepted for LT3980IDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3980IDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3980IDE#PBF?
LT3980IDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3980IDE#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 LT3980IDE#PBF?
For technical support, including LT3980IDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3980IDE#PBF requirements.
6.How does Aetrix verify that LT3980IDE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3980IDE#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 LT3980IDE#PBF meets industry standards.
7.What is the process for return or replacement of LT3980IDE#PBF?
All LT3980IDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3980IDE#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 LT3980IDE#PBF part is unused and in its original packaging.
Return procedure for LT3980IDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3980IDE#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
