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Analog Devices Inc. LT3480EMSE#TRPBF
- Part No.:
- LT3480EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3480EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,601
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Product details
Overview
LT3480EMSE#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 delivers up to 2A output current across 3.6V–36V input, maintains 70µA quiescent current in Burst Mode at 12VIN→3.3VOUT, and supports adjustable frequency from 200kHz to 2.4MHz for compact power supply design in automotive battery regulation.
For engineers reviewing the LT3480EMSE#TRPBF datasheet, LT3480EMSE#TRPBF pinout, LT3480EMSE#TRPBF application, or LT3480EMSE#TRPBF equivalent, key selection considerations include its 0.790V feedback reference, power good flag (PG), soft-start via RUN/SS pin, low-ripple Burst Mode operation (<15mV ripple), and thermal performance in the 10-lead MSOP package with exposed pad.
Technical Context
The LT3480EMSE#TRPBF employs constant-frequency current-mode PWM control with an internal oscillator set by an external RT resistor (200kHz–2.4MHz). Its bipolar NPN switch uses BOOST-pin-driven gate drive for full saturation, enabling high efficiency at high input voltages up to 36V (with 60V transient tolerance).
Burst Mode operation reduces quiescent current to 70µA while maintaining output ripple below 15mV; bias current can be drawn from VOUT when >3V to further improve light-load efficiency. The device integrates soft-start (via RC on RUN/SS), overvoltage lockout (~38V trip), and a power good flag that asserts when FB reaches 86% of regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V transients - enables direct connection to 24V/36V industrial and automotive batteries. |
| Max Output Current | 2A - sufficient for powering FPGAs, DSPs, and multi-rail subsystems without external current boosting. |
| Quiescent Current | 70µA in Burst Mode (12VIN→3.3VOUT) - extends battery life in always-on portable and telematics applications. |
| Switching Frequency | Adjustable 200kHz to 2.4MHz via RT pin - allows optimization of inductor size (e.g., 4.7µH at 800kHz) vs. efficiency trade-offs. |
| Feedback Reference | 0.790V ±10mV - enables precise output programming from 0.79V to 20V using standard 1% resistors. |
| Power Good Flag | Open-collector PG pin asserts when VOUT reaches 86% of target - provides reliable system sequencing and fault detection. |
| Thermal Package | 10-lead MSOP with exposed pad (θJA = 45°C/W) - supports 2A continuous operation with minimal PCB copper area. |
Pinout & Package
LT3480EMSE#TRPBF is housed in a thermally enhanced 10-lead MSOP package (3mm × 3mm footprint) with exposed pad (Pin 11) soldered to PCB ground for optimal thermal dissipation (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (1) | Bias Diode Anode | Connects to boost Schottky anode; supplies bias current to internal regulator - must be bypassed with ≥1µF low-ESR capacitor if not tied to VOUT. |
| BOOST (2) | Boost Capacitor Drive | Provides >VIN voltage to saturate internal NPN switch - requires external boost capacitor and Schottky diode. |
| SW (3) | Switch Node | Output of internal power switch - connects directly to inductor, catch diode, and boost capacitor. |
| VIN (4) | Main Input Supply | Supplies power to internal regulator and switch - requires local 4.7µF ceramic bypass near pin. |
| RUN/SS (5) | Enable & Soft-Start Control | Logic-level shutdown (≤0.2V = off); RC ramp enables controlled VOUT rise - eliminates inrush current. |
| SYNC (6) | External Clock Input | Accepts 250kHz–2MHz external clock for EMI reduction or synchronization with other converters. |
| PG (7) | Power Good Flag | Open-collector output signals VOUT regulation status - pulled high externally when FB ≥86% of target. |
| 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 - used for loop compensation with external RC network to ground. |
| RT (10) | Oscillator Frequency Set | Resistor-to-ground sets switching frequency (e.g., 40.2kΩ = 800kHz) - determines inductor/capacitor sizing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external boost diode - reduces BOM count and layout area while ensuring reliable switch saturation. |
| Low-Ripple Burst Mode® | Maintains <15mV output ripple at light loads - avoids audible noise and meets strict analog/RF supply requirements. |
| Overvoltage Lockout (OVL) | Disables switching above ~38V VIN - protects downstream circuitry during load dump or battery jump-start events. |
| Saturating Switch Design | 0.25Ω on-resistance NPN switch - delivers high efficiency (>85% at 1A, 12V→5V) without requiring external MOSFET drivers. |
| Thermally Enhanced MSOP | Exposed pad (Pin 11 = GND) enables 2A continuous operation with standard 2-layer PCB - no heatsink required. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 24V truck battery supply to 3.3V/5V for infotainment ECUs under cold-crank (6V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Primary buck converter with OVL protection, Burst Mode for sleep-state efficiency, and PG flag for microcontroller wake-up sequencing. Use Value: Survives 60V transients without external clamping; 70µA IQ extends battery runtime during vehicle-off mode. |
Use Scenario: Providing isolated 12V/5V rails from 36V factory bus to PLC I/O modules operating in -40°C to 125°C ambient. IC Role / Device Role / Timing Role: High-input-voltage DC/DC front-end with adjustable frequency (to avoid noise-sensitive bands) and thermal robustness in MSOP package. Use Value: 36V max input and 125°C rated version (LT3480E) enable single-supply operation without pre-regulators; exposed pad ensures reliability in convection-cooled enclosures. |
| Portable Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Powering ADCs, op-amps, and wireless transceivers in handheld ultrasound devices powered by Li-ion (8.4V–12.6V) packs. IC Role / Device Role / Timing Role: Low-noise, high-efficiency intermediate regulator delivering clean 3.3V from variable battery voltage. Use Value: <15mV ripple in Burst Mode prevents signal corruption; 0.790V reference enables accurate programmable outputs for sensor biasing. |
Use Scenario: Generating precision ±15V and +5V rails in benchtop oscilloscopes where EMI and thermal stability are critical. IC Role / Device Role / Timing Role: Synchronized buck controller (via SYNC pin) minimizing beat frequencies with other switching supplies in multi-rail systems. Use Value: External clock synchronization eliminates heterodyne noise in sensitive analog front-ends; soft-start prevents relay chatter during power-up. |
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 input, 1.5A, 3MHz max freq, no integrated boost diode - requires external bootstrap circuit. | Higher frequency enables smaller passives but lacks BD pin integration - increases layout complexity. | Choose LTC3631 for ultra-compact designs needing >2MHz operation; retain LT3480EMSE#TRPBF when simplicity and proven 2A capability are prioritized. |
| MP2451DT-LF-Z | 36V input, 0.6A, no PG flag, no SYNC, 0.8V ref - lower current rating and fewer system-level features. | Cost-optimized for non-critical consumer applications; unsuitable for automotive or industrial 2A loads. | Use MP2451 only in space-constrained, low-power applications where PG, soft-start, and thermal robustness are non-essential. |
Compared with LTC3631EMSE#PBF and MP2451DT-LF-Z, the LT3480EMSE#TRPBF uniquely combines 2A output, integrated boost diode, power good signaling, and automotive-grade temperature range in a single MSOP package - making it the preferred choice for mission-critical 24V/36V-to-low-voltage conversion where reliability and feature completeness outweigh marginal cost differences.
Availability
LT3480EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3480EMSE#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 full technical and manufacturing continuity for all Linear power products, including rigorous AEC-Q100 stress testing for automotive variants.
The LT3480 product line was designed specifically for high-input-voltage DC/DC conversion in harsh environments - emphasizing transient robustness, low IQ operation, and integrated power stage simplicity for automotive, industrial, and portable equipment.
FAQ
What is the maximum input voltage the LT3480EMSE#TRPBF can safely handle?
The LT3480EMSE#TRPBF operates continuously up to 36V input and is rated to withstand non-repetitive transients up to 60V on the VIN pin. Internal overvoltage lockout disables switching above ~38V (typical) to protect downstream circuitry, while the 60V absolute maximum rating ensures survival during automotive load-dump events. This makes the LT3480EMSE#TRPBF suitable for direct connection to 24V and 36V battery systems without external clamping.
Does the LT3480EMSE#TRPBF require an external boost diode?
No - the LT3480EMSE#TRPBF integrates a Schottky diode connected to the BD pin, eliminating the need for an external boost diode. The BD pin serves both as the anode connection for the internal diode and as a bias supply path. When BD is tied to VOUT (≥3V), the IC draws bias current from the output rail, improving light-load efficiency. A local 1µF low-ESR capacitor is still required on the BD pin if not directly connected to VOUT.
How does the LT3480EMSE#TRPBF achieve low output ripple in Burst Mode?
The LT3480EMSE#TRPBF achieves <15mV peak-to-peak output ripple in Burst Mode through optimized control-loop behavior and minimized burst energy per cycle. During light loads, the IC enters low-ripple Burst Mode where the switch remains fully off between bursts, reducing switching losses and EMI. Unlike conventional pulse-skipping, this architecture maintains tight output voltage regulation and avoids audible coil whine - critical for powering noise-sensitive analog and RF circuits.
Can the LT3480EMSE#TRPBF be synchronized to an external clock?
Yes - the LT3480EMSE#TRPBF supports external clock synchronization via the SYNC pin (Pin 6), accepting input frequencies from 250kHz to 2MHz. This allows precise timing alignment with other switching regulators in multi-rail systems to eliminate beat frequencies and reduce conducted EMI. Clock edges must have rise/fall times faster than 1µs, and the SYNC pin bias current is only 0.1µA, minimizing loading on the master clock source.
What is the purpose of the exposed pad on the LT3480EMSE#TRPBF MSOP package?
The exposed pad (Pin 11) on the LT3480EMSE#TRPBF MSOP package is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve θJA = 45°C/W and θJC = 10°C/W. This thermal interface enables continuous 2A operation at ambient temperatures up to 125°C without heatsinks - a key requirement for dense industrial and automotive power designs where airflow is limited.
LT3480EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT3480EMSE#TRPBF FAQ
1.How can I place an order for LT3480EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3480EMSE#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 LT3480EMSE#TRPBF reliable?
The price and inventory of LT3480EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3480EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3480EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3480EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3480EMSE#TRPBF?
LT3480EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3480EMSE#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 LT3480EMSE#TRPBF?
For technical support, including LT3480EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3480EMSE#TRPBF requirements.
6.How does Aetrix verify that LT3480EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3480EMSE#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 LT3480EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3480EMSE#TRPBF?
All LT3480EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3480EMSE#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 LT3480EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3480EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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