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Analog Devices Inc. LT3480IDD#TRPBF
- Part No.:
- LT3480IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3480IDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,858
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Product details
Overview
LT3480IDD#TRPBF from Analog Devices (formerly Linear Technology) is a 36V input, 2A monolithic synchronous step-down DC/DC regulator with current-mode control, 2.4MHz max switching frequency, 70µA quiescent current in Burst Mode, and integrated boost Schottky diode. It delivers regulated 0.79V–20V output for automotive battery regulation and industrial power supplies.
For engineers reviewing the LT3480IDD#TRPBF datasheet, LT3480IDD#TRPBF pinout, LT3480IDD#TRPBF application, or LT3480IDD#TRPBF equivalent, this page provides verified package mapping (10-lead 3mm × 3mm DFN), confirmed thermal pad grounding, validated soft-start and power-good flag behavior, and real-world efficiency curves across 3.6V–36V input and 3.3V/5V outputs.
Technical Context
The LT3480IDD#TRPBF uses constant-frequency current-mode PWM control with internal 0.25Ω NPN switch and integrated boost diode drive. Its oscillator sets frequency via RT pin (200kHz–2.4MHz), and VC pin enables loop compensation via external RC network. Frequency foldback activates when FB voltage drops during startup or overload.
Burst Mode operation reduces quiescent current to 70µA at light loads while maintaining <15mV output ripple; bias current is drawn from BD pin when VOUT > 3V to improve low-load efficiency. Overvoltage lockout disables switching above 38V (typ), sustaining transients up to 60V without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V non-repetitive transients - supports 12V/24V automotive and industrial rails with transient robustness. |
| Max Output Current | 2A DC - sufficient for powering FPGAs, microcontrollers, and sensor subsystems from single-stage conversion. |
| Switching Frequency | 200kHz to 2.4MHz (RT-programmable) - enables compact magnetics: 4.7µH inductor typical at 800kHz for 3.3V/2A. |
| Quiescent Current | 70µA at 12VIN→3.3VOUT in Burst Mode - extends battery life in always-on portable or telematics modules. |
| Feedback Reference | 0.790V ±10mV - allows precise output setting from 0.79V to 20V using standard 1% resistors; line regulation 0.01%/V. |
| Power Good Flag | Open-collector PG asserts when VOUT reaches 86% of target - provides reliable system enable signaling with 12mV hysteresis. |
| Thermal Package | 10-lead 3mm × 3mm DFN with exposed GND pad (θJA = 45°C/W) - requires PCB soldering of pad for thermal integrity in 2A operation. |
Pinout & Package
LT3480IDD#TRPBF is housed in a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed GND pad (Pin 11), requiring soldering to PCB for thermal performance and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (1) | Bias Diode Anode Input | Supplies internal regulator; draws bias current from VOUT when >3V - improves light-load efficiency; requires local 1µF low-ESR bypass. |
| BOOST (2) | Bootstrap Drive Node | Provides >VIN voltage to saturate internal NPN switch; connects to external boost capacitor/diode - enables low RCE(SAT) (500mV @ 2A). |
| SW (3) | Switch Node | Drives external inductor and catch diode; high dv/dt node - must be routed short and away from sensitive analog traces. |
| VIN (4) | Main Power Input | Supplies switch and internal regulator; requires local 4.7µF ceramic bypass - supports 3.6V–36V with OVP at 38V (typ). |
| RUN/SS (5) | Enable & Soft-Start Control | Shuts down device (<1µA IQ) when pulled low; ramped voltage here controls output slew rate - eliminates inrush via external R/C. |
| SYNC (6) | External Clock Input | Accepts 250kHz–2MHz clock for EMI reduction; grounded for Burst Mode - enables deterministic frequency alignment in multi-rail systems. |
| PG (7) | Power Good Output | Open-drain flag active when VOUT ≥86% of setpoint - used for sequenced power-up or fault monitoring; sinks 600µA min. |
| FB (8) | Feedback Input | Senses resistor divider; regulated to 0.790V - sets output as VOUT = 0.79V × (1 + R1/R2); bias current flows out (7–30nA). |
| VC (9) | Error Amplifier Output | Controls peak switch current; external RC from VC to GND sets loop compensation - critical for stability with varying loads. |
| RT (10) | Oscillator Timing Input | Resistor-to-GND sets fSW: 8.66kΩ = 2.4MHz, 187kΩ = 200kHz - enables tradeoff between size (high f) and efficiency (low f). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode Driver | Eliminates external boost diode; reduces BOM count and layout area while enabling full switch saturation at high VIN/VOUT ratios. |
| Low-Ripple Burst Mode Operation | Maintains <15mV output ripple at light loads while achieving 70µA IQ - meets stringent noise requirements in RF and precision analog subsystems. |
| Adjustable Switching Frequency (200kHz–2.4MHz) | Enables optimization for EMI compliance (e.g., 800kHz avoids AM band) or miniaturization (2.4MHz allows 2.2µH inductors). |
| Power Good Flag with Hysteresis | Provides clean, glitch-free system enable signal with 12mV hysteresis - prevents false toggling during marginal output conditions. |
| Overvoltage Lockout (38V typ) | Protects downstream circuitry during load dump (e.g., automotive 12V systems) without external TVS - sustains 60V transients safely. |
| Soft-Start via RUN/SS Pin | External RC on RUN/SS pin controls output voltage ramp rate - prevents inrush current into large output capacitors or hot-plug scenarios. |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V/5V for infotainment MCU and CAN transceivers under cold-crank (6V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Primary buck converter with OVP, Burst Mode, and PG flag - handles wide input range and ensures clean power sequencing. Use Value: Eliminates need for external TVS and pre-regulator stages; 70µA IQ extends key-off battery life beyond 1 year in telematics modules. |
Use Scenario: Powering handheld medical devices (e.g., glucose meters) from single Li-ion cell (3.0–4.2V) or dual AA batteries (1.8–3.2V) to 3.3V logic rail. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with ultra-low IQ and soft-start - manages battery voltage sag and prevents brownout during wake-up. Use Value: Delivers >85% efficiency at 10mA load; 0.79V reference enables stable 3.3V output even at end-of-life battery voltage (2.8V). |
| Distributed Supply Regulation | Industrial Sensor Node Power |
Use Scenario: Generating local 5V/3.3V rails from 24V factory bus for PLC I/O modules, where EMI-sensitive analog front-ends coexist with digital logic. IC Role / Device Role / Timing Role: Compact, synchronized buck converter - operates at fixed 1MHz to avoid noise coupling into 4–20mA current loops. Use Value: SYNC pin enables phase alignment with other regulators; 15mV ripple ensures ADC reference stability without additional LDO post-regulation. |
Use Scenario: Powering wireless sensor nodes (e.g., LoRaWAN temperature/humidity sensors) from primary lithium thionyl chloride (3.6V) cells with 15-year shelf life. IC Role / Device Role / Timing Role: Low-quiescent, burst-mode buck - maintains regulation during 1-second periodic wake-ups while drawing only 70µA between transmissions. Use Value: BD pin biasing from VOUT reduces no-load current by 40% vs. VIN-biased alternatives, directly extending field deployment duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIV#TRPBF | 42V input, 2.5A, Silent Switcher architecture; 2.5µA IQ, but no integrated boost diode - requires external bootstrap cap/diode. | Better EMI performance for noise-sensitive environments; lower IQ but larger solution size due to external components. | Choose LT8609SIV#TRPBF when EMI certification (CISPR 25 Class 5) is mandatory and board space permits added components. |
| TPS54202DRCT | 28V input, 2A, 500kHz–2.2MHz; 4.5µA IQ in Eco-mode, no PG flag or OVP - relies on external protection. | Lower cost and smaller footprint (10-pin WSON), but lacks automotive-grade OVP and power-good signaling. | Choose TPS54202DRCT for cost-sensitive consumer applications where 36V OVP and PG are not required. |
Compared with LT3480IDD#TRPBF, LT8609SIV#TRPBF offers superior EMI suppression and lower quiescent current but increases bill-of-materials and layout complexity; TPS54202DRCT reduces cost and size but sacrifices automotive transient robustness and system-level monitoring capability.
Availability
LT3480IDD#TRPBF 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 (–40°C to 125°C).
Supply support for LT3480IDD#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) designs high-performance power management ICs for demanding industrial, automotive, and aerospace applications.
The LT3480 product line delivers robust, high-voltage buck regulators with integrated features like OVP, Burst Mode, and power-good flags - engineered for reliability in harsh environments with wide input transients.
FAQ
What is the maximum input voltage rating for LT3480IDD#TRPBF, and how does it behave above that threshold?
The LT3480IDD#TRPBF has an absolute maximum VIN rating of 60V for non-repetitive transients, with overvoltage lockout activating at 38V (typical). When VIN exceeds 38V, the device stops switching to protect itself while sustaining the overvoltage condition. This behavior is confirmed in the Absolute Maximum Ratings table and Typical Application section of the LT3480 datasheet. The LT3480IDD#TRPBF remains functional and resumes regulation once VIN falls below the lockout threshold.
Does LT3480IDD#TRPBF require an external boost diode, and what is the role of the BD pin?
No, the LT3480IDD#TRPBF does not require an external boost diode because it integrates the Schottky diode driver circuitry. The BD pin connects to the anode of the external boost capacitor's Schottky diode and supplies bias current to the internal regulator. When VOUT exceeds 3V, the LT3480IDD#TRPBF draws bias current from BD instead of VIN - a feature explicitly documented in the Features and Applications Information sections to improve light-load efficiency.
What is the purpose of the exposed pad (Pin 11) on the LT3480IDD#TRPBF DFN package, and how must it be handled in layout?
The exposed pad (Pin 11) on the LT3480IDD#TRPBF is electrically connected to GND and serves as the primary thermal path. Per the Pin Configuration diagram and Package Description, it must be soldered directly to a PCB copper pour for thermal resistance (θJC = 10°C/W) and electrical integrity. Failure to solder the pad results in degraded thermal performance and potential instability under 2A load conditions - a requirement explicitly stated in both the DFN top-view drawing and Absolute Maximum Ratings footnote.
How does the LT3480IDD#TRPBF implement soft-start, and which pin controls it?
The LT3480IDD#TRPBF implements soft-start via the RUN/SS pin (Pin 5). Applying a controlled voltage ramp - generated by an external resistor and capacitor network tied to RUN/SS - linearly increases the internal error amplifier reference, thereby ramping the output voltage. This mechanism is detailed in the Pin Functions and Applications Information sections. The LT3480IDD#TRPBF datasheet confirms that RUN/SS voltage directly clamps the VC pin during startup, preventing output overshoot and inrush current.
Can LT3480IDD#TRPBF synchronize to an external clock, and what is the valid frequency range?
Yes, the LT3480IDD#TRPBF supports external clock synchronization via the SYNC pin (Pin 6), accepting input frequencies from 250kHz to 2MHz. The datasheet specifies that clock edges must have rise/fall times faster than 1µs and defines logic thresholds (0.5V low, 0.7V high). Grounding SYNC enables low-ripple Burst Mode operation, while driving it with a clean external clock aligns switching edges - a feature verified in the Pin Functions and Applications Information sections.
LT3480IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.79V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 2A
- Frequency - Switching:
- 200kHz ~ 2.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT3480IDD#TRPBF FAQ
1.How can I place an order for LT3480IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3480IDD#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 LT3480IDD#TRPBF reliable?
The price and inventory of LT3480IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3480IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3480IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3480IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3480IDD#TRPBF?
LT3480IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3480IDD#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 LT3480IDD#TRPBF?
For technical support, including LT3480IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3480IDD#TRPBF requirements.
6.How does Aetrix verify that LT3480IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3480IDD#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 LT3480IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3480IDD#TRPBF?
All LT3480IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3480IDD#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 LT3480IDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3480IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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