My Inquiry
My Account
Analog Devices Inc. LT3980IDE#TRPBF
- Part No.:
- LT3980IDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LT3980IDE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,820
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3980IDE#TRPBF 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 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#TRPBF datasheet, LT3980IDE#TRPBF pinout, LT3980IDE#TRPBF application, or LT3980IDE#TRPBF equivalent, key selection considerations include its 58V max input rating with 80V transient tolerance, thermal shutdown, power good flag, soft-start via RUN/SS pin, and compatibility with low-ESR ceramic output capacitors in space-constrained 3mm × 4mm DFN packages.
Technical Context
The LT3980IDE#TRPBF employs constant-frequency current-mode PWM control with internal error amplifier servoing VC to regulate FB at 790mV ±18mV. Its oscillator supports external RT resistor programming and frequency foldback during startup/overload, while DA pin sensing pauses switching under catch-diode overcurrent to limit inductor current.
It features dual bias paths: draws from VIN by default, but switches to VOUT-derived bias when BD ≥3V-reducing no-load IQ to 85µA at 12VIN→3.3VOUT. The BOOST pin drives an external capacitor-diode network to supply >VIN gate drive, enabling full saturation of the integrated bipolar switch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 58V continuous; withstands 80V transients-supports 24V/48V industrial and 12V automotive battery rails with OVP lockout at 58V min. |
| Output Current | 2A maximum continuous-enables single-regulator 5V/3.3V supplies for microcontrollers, sensors, and I/O peripherals. |
| Quiescent Current | 85µA in Burst Mode® at 12VIN→3.3VOUT-extends battery life in always-on systems without sacrificing regulation accuracy. |
| Switching Frequency | Adjustable 100kHz–2.4MHz via RT pin resistor-allows trade-off between small magnetics (high-f) and efficiency/dropout (low-f). |
| Feedback Voltage | 790mV ±18mV over temperature-sets precise output voltage with standard resistor dividers; enables 1.2V–58V programmable outputs. |
| Power Good Threshold | 91% of regulated VOUT with 14mV hysteresis-provides reliable system power sequencing and fault detection. |
| Thermal Protection | Internal junction shutdown at 150°C (H-grade), 125°C (E/I-grade)-ensures safe operation under overload or poor PCB heatsinking. |
Pinout & Package
LT3980IDE#TRPBF is housed in a thermally enhanced 14-lead (3mm × 4mm) plastic DFN package with exposed pad (Pin 15 = GND). The package delivers θJA = 45°C/W and θJC = 10°C/W, requiring soldered exposed pad for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DA (14) | Catch diode current sense input | Pauses oscillator during overcurrent events-protects inductor and switch during short-circuit or high-dV/dt transients. |
| VIN (12) | Main input power supply | Accepts 3.6V–58V; powers internal regulator and switch-requires local 10µF ceramic bypass near pin. |
| SW (11) | Switch node | Connects to inductor, catch diode cathode, and boost capacitor-carries high di/dt; layout critical for EMI control. |
| BOOST (10) | Boost capacitor drive | Supplies >VIN gate drive to internal NPN switch-requires external Schottky diode and capacitor (e.g., 10nF). |
| BD (9) | Boost diode anode supply | Provides bias current to internal regulator-connects to anode of external boost Schottky diode. |
| RUN/SS (8) | Enable & soft-start control | Pull ≥2.5V to enable; tie RC network for controlled VOUT ramp-reduces inrush and stabilizes startup. |
| RT (6) | Oscillator frequency set | Resistor to GND programs fSW from 100kHz–2.4MHz-e.g., 32.4kΩ sets 1MHz per datasheet Figure 1. |
| FB (4) | Feedback input | Regulated to 790mV; connects to resistor divider tap-determines output voltage with ±1% typical accuracy. |
| PG (3) | Power good open-collector output | Sinks current when VOUT < 91% of target-requires external pull-up for system monitoring or sequencing. |
| GND (7,15) | Ground reference | Exposes thermal pad (Pin 15); must be soldered to large PCB copper area for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains <15mVP-P output ripple at light loads while holding IQ to 85µA-ideal for battery-powered remote sensors. |
| Catch diode current sense (DA) | Enables real-time inductor current limiting independent of switch duty cycle-prevents saturation during input surges or shorts. |
| Output bias from VOUT | Draws regulator bias from output when VOUT >3V via BD pin-eliminates wasted current from VIN at light loads. |
| Overvoltage lockout | Disables switching at VIN >58V (min), sustaining 80V transients-protects downstream circuitry without external TVS. |
| Power good flag with hysteresis | Signals valid regulation at 91% VOUT with 14mV window-avoids chatter during marginal line/load conditions. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: Powering infotainment head units and ADAS cameras from 12V vehicle battery with cold-crank (4.5V) and load-dump (60V) transients. IC Role / Device Role / Timing Role: Primary buck converter regulating 5V/3.3V rails with OVP, thermal shutdown, and low-IQ sleep mode. Use Value: Survives 80V load-dump without external clamping; maintains 85µA quiescent draw during vehicle off-state. |
Use Scenario: Local point-of-load conversion in factory automation PLCs where 24V/48V backplanes feed multiple isolated subsystems. IC Role / Device Role / Timing Role: High-efficiency step-down regulator delivering 2A at 5V to FPGA I/O banks and communication interfaces. Use Value: Adjustable 100kHz–2.4MHz switching allows compact 2.2µH inductors; PG flag enables coordinated module power-up. |
| Industrial Supplies | Wall Transformer Regulation |
Use Scenario: Replacing linear regulators in DIN-rail mounted HMIs and motor drives requiring stable 3.3V for ARM Cortex-M7 MCUs. IC Role / Device Role / Timing Role: Wide-input buck controller supporting unregulated 24V–56V inputs with tight output tolerance. Use Value: 790mV FB reference enables ±1% output accuracy; thermal shutdown prevents field failures in enclosed enclosures. |
Use Scenario: Secondary-side regulation in universal-input AC/DC adapters powering IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: Post-regulator stepping down 12V–24V DC bus to clean 3.3V/5V for wireless SoCs and sensors. Use Value: Low 15mVP-P ripple in Burst Mode® eliminates need for post-LDO filtering; DFN package fits slim adapter profiles. |
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 2MHz fSW, no DA pin or BOOST driver-requires external bootstrap diode/cap. | Lacks 58V capability and catch-diode current sense; suited for lower-voltage, cost-sensitive designs without transient protection needs. | Select LTC3631EMSE#PBF only if input stays ≤40V and DA-based fault protection is unnecessary. |
| MP2451DT-LF-Z | 36V max input, 0.6A output, 2MHz fixed fSW, no PG flag or soft-start-integrated MOSFET but no BD/BOOST pins. | Lower current and voltage rating; lacks power sequencing support and transient robustness-targeted at consumer USB-powered devices. | Choose MP2451DT-LF-Z for sub-1A, ≤36V applications where PG, soft-start, and 80V surge immunity are not required. |
Compared with LTC3631EMSE#PBF and MP2451DT-LF-Z, LT3980IDE#TRPBF uniquely combines 58V operation, 2A output, DA-pin fault protection, and VOUT-bias efficiency-making it the only option among the three qualified for automotive and industrial 48V systems with stringent reliability requirements.
Availability
LT3980IDE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, distributed supply regulation, and industrial embedded power conversion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3980IDE#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 and maintains its high-reliability analog power portfolio. Linear's legacy design ethos emphasizes precision, ruggedness, and application-ready integration.
The LT3980IDE#TRPBF belongs to Linear's monolithic buck regulator family engineered for wide-input industrial and automotive power conversion-designed to replace discrete switcher solutions with integrated protection, low IQ, and thermal resilience.
FAQ
What is the absolute maximum input voltage rating for LT3980IDE#TRPBF?
The LT3980IDE#TRPBF 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 LT3980IDE#TRPBF suitable for 48V industrial buses and automotive load-dump scenarios.
Does LT3980IDE#TRPBF require an external bootstrap diode and capacitor?
Yes, LT3980IDE#TRPBF requires an external Schottky diode (e.g., SBR3U100LP) and capacitor (typically 10nF X7R) connected between BD and BOOST pins. The BOOST pin uses this network to generate a voltage higher than VIN, enabling full saturation of the internal bipolar NPN switch-critical for achieving 200mΩ RCE(SAT) and high efficiency.
How does the DA pin function in LT3980IDE#TRPBF during fault conditions?
The DA pin on LT3980IDE#TRPBF senses catch diode current and pauses the oscillator when current exceeds ~2.4A, preventing inductor saturation and switch overstress during short circuits or input transients. This real-time current limiting operates independently of the main current-sense path and remains active even at high switching frequencies-enhancing robustness beyond standard cycle-by-cycle protection.
Can LT3980IDE#TRPBF operate with output voltages below 1.2V?
No, LT3980IDE#TRPBF cannot reliably regulate below 1.2V because its feedback reference is fixed at 790mV ±18mV. Output voltage is calculated as VOUT = 0.79V × (1 + R1/R2), so minimum practical VOUT is constrained by resistor tolerance and noise margin-typically ≥1.2V with standard 1% resistors. For sub-1V regulation, a different controller with adjustable reference is required.
What thermal derating applies to LT3980IDE#TRPBF at 125°C junction temperature?
LT3980IDE#TRPBF is rated for –40°C to 125°C operating junction temperature (I-grade). At TJ = 125°C, output current must be derated per the thermal resistance: with θJA = 45°C/W on a 2-layer board, 1W of dissipation raises TJ by 45°C above ambient-so full 2A load is only sustainable with adequate copper area and airflow. Derating curves in the datasheet show ~1.5A max at 125°C ambient with minimal heatsinking.
LT3980IDE#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)
LT3980IDE#TRPBF FAQ
1.How can I place an order for LT3980IDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3980IDE#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 LT3980IDE#TRPBF reliable?
The price and inventory of LT3980IDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3980IDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3980IDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3980IDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3980IDE#TRPBF?
LT3980IDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3980IDE#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 LT3980IDE#TRPBF?
For technical support, including LT3980IDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3980IDE#TRPBF requirements.
6.How does Aetrix verify that LT3980IDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3980IDE#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 LT3980IDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3980IDE#TRPBF?
All LT3980IDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3980IDE#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 LT3980IDE#TRPBF part is unused and in its original packaging.
Return procedure for LT3980IDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3980IDE#TRPBF 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…
