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Analog Devices Inc. LT3480EDD#TRPBF
- Part No.:
- LT3480EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3480EDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,972
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Product details
Overview
LT3480EDD#TRPBF from Analog Devices (formerly Linear Technology) is a 36V, 2A, 2.4MHz monolithic step-down switching regulator with current-mode control, integrated 0.25Ω NPN switch and on-chip Schottky boost diode. It operates from 3.6V to 36V input, delivers adjustable output from 0.79V to 20V, and maintains 70µA quiescent current in Burst Mode for battery-powered industrial sensors and portable instrumentation.
For engineers reviewing the LT3480EDD#TRPBF datasheet, LT3480EDD#TRPBF pinout, LT3480EDD#TRPBF application, or LT3480EDD#TRPBF equivalent, key selection criteria include its 2.4MHz max switching frequency, 0.790V feedback reference, power good flag, soft-start via RUN/SS pin, and thermal performance in the 3mm × 3mm DFN-10 package with exposed pad.
Technical Context
The LT3480EDD#TRPBF uses constant-frequency current-mode PWM control with oscillator frequency set by an external RT resistor (200kHz–2.4MHz). Its bipolar NPN switch is driven via an internal charge pump connected to the BOOST pin, enabling full saturation at high input voltages.
Burst Mode operation reduces quiescent current to 70µA while holding output ripple below 15mV; bias current can be drawn from VOUT when above 3V to further improve light-load efficiency. The device includes overvoltage lockout (36V min), power good flag (86% VREF threshold), and active soft-start controlled by an RC network on RUN/SS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V transients - enables direct connection to automotive and industrial 24V/36V rails. |
| Output Current | 2A maximum - supports mid-power embedded systems without external current boosting. |
| Switching Frequency | 200kHz to 2.4MHz (adjustable via RT pin) - allows optimization of inductor size vs. efficiency in space-constrained designs. |
| Quiescent Current | 70µA at 12VIN → 3.3VOUT in Burst Mode - extends battery life in always-on IoT edge nodes. |
| Feedback Reference | 0.790V ±10mV - enables precise output regulation down to sub-1V levels with standard resistor dividers. |
| Power Good Flag | Open-collector PG asserts when FB reaches 86% of target - provides reliable system-level power sequencing and fault detection. |
| Thermal Package | 3mm × 3mm DFN-10 with exposed GND pad (θJA = 45°C/W) - delivers low thermal resistance for sustained 2A operation without heatsinking. |
Pinout & Package
LT3480EDD#TRPBF is housed in a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11), which must be soldered to PCB ground for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (1) | Boost Diode Anode Input | Supplies bias current to internal regulator; connects to boost capacitor anode - must be bypassed with ≥1µF low-ESR capacitor if not tied to VOUT. |
| BOOST (2) | Charge Pump Drive Node | Provides >VIN voltage to saturate internal NPN switch - requires external Schottky diode and capacitor for proper operation. |
| SW (3) | Switch Output | Drives external inductor and catch diode - carries high di/dt switching current; layout critical for EMI control. |
| VIN (4) | Main Power Input | Supplies internal regulator and switch driver; requires local 4.7µF ceramic bypass close to pin. |
| RUN/SS (5) | Enable & Soft-Start Control | Pull ≥2.5V for operation; tie to RC network for controlled VOUT ramp - also shuts down device when pulled low (<0.2V). |
| SYNC (6) | External Clock Input | Accepts 250kHz–2MHz clock for synchronization - grounds for default Burst Mode operation. |
| PG (7) | Power Good Output | Open-collector flag signaling VOUT regulation (FB ≥86% of target) - requires external pull-up resistor. |
| FB (8) | Feedback Input | Regulated to 0.790V; connects to resistor divider tap - determines output voltage with ±10mV tolerance. |
| VC (9) | Error Amplifier Output | Controls peak switch current; used for loop compensation via RC network to GND - clamped during current limit. |
| RT (10) | Oscillator Frequency Set | Resistor-to-GND sets switching frequency (e.g., 8.66kΩ = 2.4MHz); enables precise timing control across temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external boost diode, reducing BOM count and board area in compact DC/DC designs. |
| Low-Ripple Burst Mode Operation | Maintains <15mV output ripple at light loads while achieving 70µA IQ - critical for noise-sensitive analog signal chains. |
| Saturating NPN Switch (0.25Ω) | Enables high-efficiency operation across wide VIN range without gate-drive complexity of MOSFET-based regulators. |
| Overvoltage Lockout (36V min) | Protects downstream circuitry during load dump or supply transients up to 60V - essential for automotive and industrial environments. |
| Adjustable Soft-Start via RUN/SS | Prevents inrush current and output overshoot using simple R-C network - simplifies power-up sequencing in multi-rail systems. |
Applications
| Automotive Battery Regulation | Portable Medical Instrumentation |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V/5V for microcontrollers and sensors in ADAS modules. IC Role / Device Role / Timing Role: Primary buck converter providing stable, transient-robust power under cold-crank (≥4.5V) and load-dump (≤60V) conditions. Use Value: OVP and wide VIN range eliminate need for front-end protection stages; Burst Mode extends runtime in sleep-mode telematics units. |
Use Scenario: Powering handheld ultrasound probes and glucose meters requiring ultra-low-noise, long-battery-life DC/DC conversion. IC Role / Device Role / Timing Role: High-efficiency step-down regulator delivering regulated 3.3V from single Li-ion cell (3.0–4.2V) or two-cell packs (6–8.4V). Use Value: 70µA IQ and <15mV ripple enable clean analog front-end operation; small DFN package fits tight mechanical envelopes. |
| Distributed Supply Regulation | Industrial Sensor Transmitters |
Use Scenario: Local point-of-load conversion in PLC I/O modules where 24V backplane supplies multiple isolated 5V/3.3V rails. IC Role / Device Role / Timing Role: Compact, thermally efficient buck regulator placed near FPGA or ADC to minimize IR drop and noise coupling. Use Value: 2.4MHz operation allows use of 1µH–2.2µH inductors, reducing solution size; exposed-pad DFN ensures stable 2A delivery without airflow. |
Use Scenario: Powering 4–20mA loop-powered field sensors operating from 12–36V industrial supplies with strict EMC and reliability requirements. IC Role / Device Role / Timing Role: Primary DC/DC converter generating 3.3V for sensor ICs and signal conditioning circuitry in hazardous-area transmitters. Use Value: 150°C junction rating (E-grade) and robust OVP support extended operation in hot enclosures; PG flag enables diagnostics and safe shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8610EMSE#PBF | 42V input, 3.5A, synchronous rectification, 2.2MHz max, 2.5µA IQ - no integrated boost diode; requires external bootstrap cap. | Higher efficiency at medium/heavy loads; better suited for high-density, high-reliability power supplies where lowest IQ is secondary. | Select LT8610EMSE#PBF when synchronous operation and lower dropout are prioritized over single-diode simplicity and ultra-low-light-load IQ. |
| TPS54202DDCR | 28V input, 2A, integrated MOSFETs, 400kHz–2.5MHz, 18µA IQ - no boost diode; uses external bootstrap capacitor. | Lacks integrated boost diode and OVP clamp; requires additional components for 36V+ operation and transient protection. | Choose TPS54202DDCR only in cost-sensitive, non-automotive applications where 28V max input and external protection are acceptable. |
Compared with LT3480EDD#TRPBF, LT8610EMSE#PBF offers superior heavy-load efficiency and higher input voltage margin but sacrifices the integrated boost diode and ultra-low 70µA Burst Mode IQ. TPS54202DDCR provides lower BOM cost and TI's ecosystem support but lacks native 36V+ capability and requires design-level OVP implementation.
Availability
LT3480EDD#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable medical instrumentation, distributed supply regulation, and industrial sensor transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3480EDD#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision, industrial, and automotive applications.
The LT3480EDD#TRPBF belongs to Linear's legacy high-voltage monolithic buck regulator product line, designed specifically for robust, compact DC/DC conversion in harsh environments where wide input range, integrated protection, and low-noise light-load operation are mandatory.
FAQ
What is the maximum input voltage rating for LT3480EDD#TRPBF?
The LT3480EDD#TRPBF has an absolute maximum VIN rating of 60V for nonrepetitive transients, with continuous operation rated up to 36V. Its overvoltage lockout activates at ~38V (typical), disabling switching to protect internal circuitry while sustaining the 60V transient. This makes LT3480EDD#TRPBF suitable for automotive and industrial 24V systems subject to load dump events.
Does LT3480EDD#TRPBF require an external boost diode?
No - the LT3480EDD#TRPBF integrates a Schottky boost diode internally, connected to the BD pin. This eliminates the need for an external diode in the charge pump path, reducing component count and PCB area. However, an external boost capacitor must still be connected between BOOST and SW pins per the datasheet layout guidelines.
How does the LT3480EDD#TRPBF achieve 70µA quiescent current?
The LT3480EDD#TRPBF achieves 70µA IQ through Low Ripple Burst Mode operation: during light loads, it disables switching and most internal circuitry between energy bursts, maintaining regulation while minimizing average supply current. This mode is automatic and preserves output ripple below 15mV - a key advantage over conventional pulse-skipping regulators.
Can LT3480EDD#TRPBF synchronize to an external clock?
Yes - the LT3480EDD#TRPBF supports external clock synchronization via the SYNC pin (Pin 6), accepting frequencies from 250kHz to 2MHz. When synchronized, it aligns its switching edges to the external source, reducing beat frequencies and EMI in multi-regulator systems. Grounding SYNC enables default Burst Mode operation.
What is the function of the exposed pad on the LT3480EDD#TRPBF DFN package?
The exposed pad (Pin 11) on the LT3480EDD#TRPBF is electrically and thermally connected to GND. It must be soldered directly to a PCB copper pour for optimal thermal dissipation (θJA = 45°C/W) and low-impedance grounding. Failure to connect this pad compromises both thermal performance and noise immunity, especially under 2A continuous load.
LT3480EDD#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT3480EDD#TRPBF FAQ
1.How can I place an order for LT3480EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3480EDD#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 LT3480EDD#TRPBF reliable?
The price and inventory of LT3480EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3480EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3480EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3480EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3480EDD#TRPBF?
LT3480EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3480EDD#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 LT3480EDD#TRPBF?
For technical support, including LT3480EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3480EDD#TRPBF requirements.
6.How does Aetrix verify that LT3480EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3480EDD#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 LT3480EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3480EDD#TRPBF?
All LT3480EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3480EDD#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 LT3480EDD#TRPBF part is unused and in its original packaging.
Return procedure for LT3480EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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