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Analog Devices Inc. LT3480EDD#PBF
- Part No.:
- LT3480EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3480EDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,286
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Product details
Overview
LT3480EDD#PBF from Analog Devices (formerly Linear Technology) is a 36V, 2A, 2.4MHz monolithic step-down switching regulator with current-mode control, integrated 0.25Ω bipolar NPN switch and on-chip Schottky boost diode. It delivers up to 2A output current at adjustable voltages from 0.79V to 20V, operates from 3.6V–36V input, and maintains 70µA quiescent current in Burst Mode for portable power applications.
For engineers reviewing the LT3480EDD#PBF datasheet, LT3480EDD#PBF pinout, LT3480EDD#PBF application, or LT3480EDD#PBF equivalent, key selection considerations include its 200kHz–2.4MHz adjustable switching frequency, 86% power-good threshold, soft-start via RUN/SS pin, overvoltage lockout (36V min), and thermal performance in the 3mm × 3mm DFN-10 package with exposed pad.
Technical Context
The LT3480EDD#PBF implements constant-frequency current-mode PWM control using an internal oscillator set by the RT pin resistor, enabling precise duty-cycle regulation and fast transient response. Its error amplifier drives the VC pin to modulate peak switch current, while active clamping on VC provides current limiting and soft-start coordination with the RUN/SS ramp.
Burst Mode operation reduces quiescent current to 70µA at light loads by disabling switching and control circuitry between bursts, maintaining output ripple below 15mV. Bias current is drawn from the BD pin when VOUT > 3V, improving efficiency, and the integrated boost diode supplies gate drive voltage higher than VIN to fully saturate the internal switch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V transients - enables automotive battery and industrial supply use. |
| Max Output Current | 2A - supports high-current point-of-load conversion without external MOSFETs. |
| Switching Frequency | 200kHz to 2.4MHz (adjustable via RT pin) - allows tradeoff between inductor size and efficiency. |
| Quiescent Current | 70µA at 12VIN/3.3VOUT in Burst Mode - extends battery life in always-on portable systems. |
| Feedback Reference | 0.790V ±10mV - enables precise output voltage setting with standard resistor dividers. |
| Power Good Threshold | 86% of regulated VOUT - provides reliable system reset signaling with 12mV hysteresis. |
| Shutdown Current | <1µA - ensures near-zero power draw during system sleep or standby. |
| On-Resistance | 0.25Ω typical - minimizes conduction loss and thermal rise at full load. |
Pinout & Package
The LT3480EDD#PBF is housed in a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11) soldered to PCB ground for low thermal resistance (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (1) | Bias Diode Anode | Supplies internal regulator; draws bias current from VOUT when >3V to improve light-load efficiency. |
| BOOST (2) | Boost Capacitor Drive | Provides elevated gate drive voltage to fully saturate internal NPN switch; requires external diode/capacitor. |
| SW (3) | Switch Node | Connects to inductor, catch diode, and boost capacitor; carries high di/dt switching current. |
| VIN (4) | Main Input Supply | Supplies power to internal regulator and switch; must be locally bypassed with ≥4.7µF ceramic capacitor. |
| RUN/SS (5) | Enable & Soft-Start Control | Logic-level enable (≥2.5V = on); RC network here sets controlled VOUT ramp rate. |
| SYNC (6) | External Clock Input | Accepts 250kHz–2MHz clock for synchronization; grounded for Burst Mode operation. |
| PG (7) | Power Good Flag | Open-collector output asserting high when VFB reaches 86% of target - used for system sequencing. |
| FB (8) | Feedback Input | Regulated to 0.790V; connects to resistor divider tap for output voltage programming. |
| VC (9) | Error Amplifier Output | Controls peak switch current; RC compensation network here stabilizes loop dynamics. |
| RT (10) | Frequency Set Resistor | Resistor to ground sets switching frequency (e.g., 8.66kΩ = 2.4MHz); enables EMI optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external boost diode, reducing BOM count and layout area in compact DFN package. |
| Low-Ripple Burst Mode® | Maintains output ripple <15mV while achieving 70µA IQ, critical for noise-sensitive analog or RF subsystems. |
| Saturating Switch Architecture | 0.25Ω on-resistance enables high efficiency at 2A load without external MOSFET drivers or heat sinks. |
| Overvoltage Lockout (OVL) | Disables switching above 36V (min), protecting downstream circuitry during 60V transients common in automotive environments. |
| Thermally Enhanced DFN | Exposed pad (Pin 11) tied to GND lowers θJA to 45°C/W - sustains full 2A output in ambient up to 85°C. |
| Adjustable Soft-Start | RUN/SS pin accepts RC network to control output voltage ramp rate, preventing inrush current and overshoot. |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery to 3.3V/5V for infotainment, ADAS sensors, or telematics modules. IC Role / Device Role / Timing Role: Primary buck converter delivering stable 2A output under wide input transients (4V–60V) and temperature extremes (−40°C to 125°C). Use Value: OVL protection prevents damage during load dump; Burst Mode extends runtime in key-off monitoring states. | Use Scenario: Powering handheld medical devices, barcode scanners, or ruggedized tablets requiring long battery life and compact footprint. IC Role / Device Role / Timing Role: High-efficiency step-down regulator converting single-cell Li-ion (4.2V) or dual-cell (8.4V) to 3.3V logic rails. Use Value: 70µA quiescent current in Burst Mode maximizes standby time; 3mm × 3mm DFN enables ultra-thin PCB designs. |
| Distributed Supply Regulation | Industrial Control Systems |
Use Scenario: Local DC-DC conversion on modular PLC I/O cards or sensor nodes powered from 24V industrial bus. IC Role / Device Role / Timing Role: Point-of-load regulator providing isolated 5V/12V rails with tight line/load regulation and robust EMI immunity. Use Value: Adjustable frequency (200kHz–2.4MHz) avoids sensitive bands; SYNC input enables system-wide clock alignment. | Use Scenario: Powering microcontrollers, ADCs, and isolation interfaces in factory automation equipment operating in harsh EMI environments. IC Role / Device Role / Timing Role: Primary 2A buck stage with PG flag for safe startup sequencing and fault reporting to host controller. Use Value: Power Good signal validates rail stability before enabling downstream logic; 125°C junction rating supports uncooled enclosures. |
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 | Higher 36V input rating, 1.5A output, integrated MOSFETs, no boost diode - uses external FETs instead of bipolar switch. | Lower max current; requires external high-side FET and bootstrap circuit; better suited for high-efficiency, low-noise designs. | Select LTC3630EMSE#PBF when lower EMI and higher efficiency at medium loads outweigh need for integrated boost diode and 2A capability. |
| LM5164QPWPRQ1 | Automotive-grade (AEC-Q100), 100V input, 0.6A output, integrated high-side MOSFET - lacks boost diode and Burst Mode. | Designed for 48V systems and start-stop operation; no light-load efficiency optimization; requires external compensation. | Choose LM5164QPWPRQ1 only for automotive 48V architectures where 100V input tolerance and AEC-Q100 qualification are mandatory. |
Compared with LTC3630EMSE#PBF and LM5164QPWPRQ1, the LT3480EDD#PBF uniquely combines 2A output, integrated boost diode, Burst Mode efficiency, and 36V input in a 3mm × 3mm DFN - making it optimal for space-constrained, battery-powered, or transient-heavy 12V/24V systems where simplicity and light-load performance are critical.
Availability
LT3480EDD#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, and distributed supply regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3480EDD#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 its portfolio of high-performance power management ICs with rigorous reliability testing and automotive-grade qualification paths.
The LT3480 product line was designed for high-input-voltage, high-current DC-DC conversion in space-constrained industrial and automotive applications where integrated boost diodes, low quiescent current, and robust transient handling are essential.
FAQ
What is the maximum input voltage the LT3480EDD#PBF can safely handle?
The LT3480EDD#PBF operates continuously up to 36V input and withstands non-repetitive transients up to 60V thanks to built-in overvoltage lockout. When VIN exceeds 36V (typical), switching halts to protect internal circuitry while maintaining safe bias conditions - a key feature for automotive and industrial environments with load-dump events.
Does the LT3480EDD#PBF require an external boost diode?
No, the LT3480EDD#PBF integrates a Schottky boost diode connected to the BD pin, eliminating the need for an external component. This simplifies design, reduces board area, and improves reliability - though an external low-ESR capacitor (≥1µF) must still be placed locally at the BD pin when not tied directly to VOUT.
How does the LT3480EDD#PBF achieve 70µA quiescent current?
The LT3480EDD#PBF achieves 70µA quiescent current through Low Ripple Burst Mode® operation: during light loads, it disables the oscillator, error amplifier, and gate driver between energy bursts, minimizing active circuitry. This mode maintains output ripple below 15mV while drawing just 70µA from VIN at 12V input and 3.3V output.
What package type and thermal characteristics does the LT3480EDD#PBF use?
The LT3480EDD#PBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 11). With θJA = 45°C/W and θJC = 10°C/W, it delivers full 2A output in ambient temperatures up to 85°C when the exposed pad is properly soldered to a thermal plane - critical for fanless industrial and automotive deployments.
Can the LT3480EDD#PBF synchronize to an external clock?
Yes, the LT3480EDD#PBF supports external clock synchronization via the SYNC pin (Pin 6), accepting frequencies from 250kHz to 2MHz with fast edge rates (<1µs). This enables EMI reduction through frequency dithering or system-level timing alignment - unlike Burst Mode operation, which requires SYNC to be grounded.
LT3480EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.79V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 2.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT3480EDD#PBF FAQ
1.How can I place an order for LT3480EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3480EDD#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 LT3480EDD#PBF reliable?
The price and inventory of LT3480EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3480EDD#PBF is usually 5 days.
3.What payment methods are accepted for LT3480EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3480EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3480EDD#PBF?
LT3480EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3480EDD#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 LT3480EDD#PBF?
For technical support, including LT3480EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3480EDD#PBF requirements.
6.How does Aetrix verify that LT3480EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3480EDD#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 LT3480EDD#PBF meets industry standards.
7.What is the process for return or replacement of LT3480EDD#PBF?
All LT3480EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3480EDD#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 LT3480EDD#PBF part is unused and in its original packaging.
Return procedure for LT3480EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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