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Analog Devices Inc. LT3480MPMSE#TRPBF
- Part No.:
- LT3480MPMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3480MPMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,176
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Product details
Overview
LT3480MPMSE#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 bipolar NPN switch, and on-die boost Schottky diode. It operates from 3.6V to 36V input, delivers up to 2A output, maintains 70µA quiescent current in Burst Mode, and features power-good flag, soft-start, and adjustable frequency (200kHz–2.4MHz). It is used in automotive battery regulation and industrial power supplies requiring high-voltage tolerance and low-noise operation.
For engineers reviewing the LT3480MPMSE#TRPBF datasheet, LT3480MPMSE#TRPBF pinout, LT3480MPMSE#TRPBF application, or LT3480MPMSE#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature rating, 0.790V feedback reference, 60V transient survivability, and MSOP-10 thermally enhanced package with exposed GND pad - all critical for ruggedized embedded and automotive power designs.
Technical Context
The LT3480MPMSE#TRPBF employs constant-frequency current-mode PWM control with oscillator frequency set by an external RT resistor (200kHz–2.4MHz), enabling precise loop stability and fast transient response. Its internal bipolar NPN switch is driven via BOOST pin with external capacitor-diode charge pump, ensuring full saturation at high VIN.
Burst Mode operation reduces quiescent current to 70µA at light loads while maintaining output ripple below 15mV; bias current is drawn from BD pin when VOUT > 3V to further improve efficiency. Overvoltage lockout activates at 36V (min), protecting downstream circuitry during 60V transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; withstands 60V non-repetitive transients - enables direct connection to 24V/36V industrial or automotive batteries. |
| Output Current | Up to 2A DC - supports mid-power rail generation without external pass devices. |
| Switching Frequency | Adjustable 200kHz to 2.4MHz via RT resistor - allows optimization of inductor size vs. efficiency and EMI profile. |
| Quiescent Current | 70µA in Burst Mode at 12VIN→3.3VOUT - extends battery life in always-on portable or telematics systems. |
| Feedback Reference | 0.790V ±15mV - enables precise output voltage setting from 0.79V to 20V using standard resistor dividers. |
| Power Good Flag | Open-collector PG asserts when VOUT reaches 86% of target - provides reliable system reset and sequencing control. |
| Operating Temp Range | –55°C to +150°C junction - qualified for under-hood automotive, aerospace, and harsh-environment industrial use. |
| Package Thermal Resistance | JC = 10°C/W, JA = 45°C/W (MSOP-10 with exposed pad) - supports high-power density layout with minimal heatsinking. |
Pinout & Package
LT3480MPMSE#TRPBF is housed in a 10-lead plastic MSOP package with exposed thermal pad (Pin 11), rated for –55°C to +150°C operation. The exposed pad must be soldered to PCB ground plane for optimal thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (Pin 1) | Bias Diode Anode Input | Connects to boost Schottky anode; supplies bias current to internal regulator - draws power from VOUT when >3V to reduce VIN quiescent draw. |
| BOOST (Pin 2) | Charge Pump Drive | Accepts boosted voltage (>VIN) to fully saturate internal bipolar NPN switch - requires external capacitor and Schottky diode. |
| SW (Pin 3) | Switch Node Output | Drives external inductor and catch diode - carries high di/dt switching current; must be routed with minimal loop area. |
| VIN (Pin 4) | Main Power Input | Supplies internal regulator and switch driver - requires local 4.7µF ceramic bypass close to pin. |
| RUN/SS (Pin 5) | Enable & Soft-Start Control | Logic-level shutdown (<0.2V = off, >2.5V = on); RC network here sets controlled output voltage ramp rate. |
| SYNC (Pin 6) | External Clock Input | Accepts 250kHz–2MHz clock for synchronization - grounds for Burst Mode; edges must be <1µs rise/fall time. |
| PG (Pin 7) | Power Good Output | Open-collector flag signaling VOUT ≥86% of regulation - requires external pull-up for microcontroller reset or status monitoring. |
| FB (Pin 8) | Feedback Input | Regulated to 0.790V; connects to resistor divider tap - determines output voltage with ±15mV accuracy over temp. |
| VC (Pin 9) | Error Amplifier Output | Controls peak switch current; external RC compensation network stabilizes loop - clamped to RUN/SS during soft-start. |
| RT (Pin 10) | Oscillator Frequency Set | Resistor-to-ground sets switching frequency (200kHz–2.4MHz) - value selected per Figure 1 in datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates external boost diode - reduces BOM count and layout area while maintaining efficient switch drive at high VIN. |
| Low-Ripple Burst Mode® | Maintains <15mV output ripple at light loads - avoids audible noise and EMI spikes common in discontinuous conduction mode. |
| Saturating Bipolar NPN Switch | 0.25Ω on-resistance at 2A - delivers higher efficiency than MOSFET-based regulators at same die size and cost. |
| Overvoltage Lockout (OVL) | Disables switching above 36V (min) - protects internal circuitry during load dump or alternator surge events in automotive applications. |
| Thermally Enhanced MSOP-10 | JC = 10°C/W with soldered exposed pad - enables 2A operation without heatsink in compact industrial PCB footprints. |
| Frequency Foldback | Reduces fSW during startup/overload - limits peak inductor current and improves reliability under fault conditions. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to stable 3.3V or 5V for infotainment ECUs, ADAS sensors, or CAN gateways under cold-crank (4.5V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Primary buck controller providing isolated, regulated low-voltage rails with OVL, PG flag, and wide VIN range. Use Value: Survives –55°C start-up and 150°C under-hood ambient; eliminates need for external TVS or pre-regulator stages. | Use Scenario: Generating 5V/12V auxiliary rails in programmable logic controllers (PLCs), motor drives, or factory automation I/O modules powered from unregulated 24VDC industrial supplies. IC Role / Device Role / Timing Role: High-reliability DC-DC converter delivering clean, sequenced power with soft-start and power-good signaling. Use Value: Enables single-stage conversion from 36V max supply; 70µA quiescent current supports low-power sleep modes in energy-conscious systems. |
| Portable Medical Equipment | Avionics Power Conditioning |
Use Scenario: Powering FPGA, ADCs, and wireless transceivers in handheld ultrasound or patient monitors operating from Li-ion (8.4V) or 12V sealed lead-acid batteries. IC Role / Device Role / Timing Role: Efficient, low-noise step-down regulator supporting burst-mode operation during standby and full-frequency mode during acquisition. Use Value: 15mV ripple ensures signal integrity in sensitive analog front-ends; 2.4MHz capability allows ultra-small 1µH inductors. | Use Scenario: Converting 28V aircraft bus to 3.3V/5V for flight control computers, inertial measurement units (IMUs), and data concentrators requiring DO-160 compliance. IC Role / Device Role / Timing Role: Ruggedized primary regulator with extended temperature grade and transient immunity for safety-critical avionics subsystems. Use Value: –55°C to +150°C rating meets MIL-STD-883 Class B requirements; 60V transient tolerance satisfies DO-160 Section 22 Level 3. |
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, 3mm × 3mm DFN, no integrated boost diode, requires external bootstrap capacitor | Lower output current; lacks BD pin bias optimization; better suited for space-constrained designs where external diode is acceptable | Select LTC3631EMSE#PBF only if board area is critical and 1.5A output suffices - LT3480MPMSE#TRPBF offers higher current and integrated boost path. |
| LM5164QPWPRQ1 | 100V input, 1A, SOIC-10, integrated MOSFETs, no BD pin, fixed 2.1MHz frequency | Higher voltage rating but lower current; no adjustable frequency or Burst Mode; AEC-Q100 qualified but wider temp range not needed for all industrial uses | Choose LM5164QPWPRQ1 for >60V transient environments (e.g., heavy equipment); LT3480MPMSE#TRPBF remains preferred for 36V systems needing 2A and ultra-low IQ. |
Compared with LTC3631EMSE#PBF and LM5164QPWPRQ1, LT3480MPMSE#TRPBF uniquely combines 2A output, integrated boost diode, –55°C to +150°C operation, and 70µA Burst Mode IQ - making it optimal for high-reliability 24V/36V systems where efficiency, thermal robustness, and component count are jointly prioritized.
Availability
LT3480MPMSE#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and avionics power conditioning requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for LT3480MPMSE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3480MPMSE#TRPBF belongs to ADI's legacy Linear Technology high-voltage monolithic buck regulator product line, designed specifically for demanding automotive, industrial, and aerospace applications requiring wide input range, extended temperature operation, and high reliability without external power switches.
FAQ
What is the maximum input voltage rating for LT3480MPMSE#TRPBF during continuous operation?
The LT3480MPMSE#TRPBF has a continuous operating input voltage limit of 36V, with overvoltage lockout activating at 36V (minimum) to disable switching. It can safely withstand non-repetitive 60V transients for up to 1 second - a critical feature for automotive load-dump protection and industrial surge immunity. This rating applies across its full –55°C to +150°C operating junction temperature range.
Does LT3480MPMSE#TRPBF require an external boost diode?
No, the LT3480MPMSE#TRPBF integrates a boost Schottky diode on-die, connected to the BD pin. This eliminates the need for an external boost diode in the charge pump circuit, reducing component count and PCB area. The BD pin also serves as a bias source - when connected to VOUT (>3V), it powers the internal regulator, lowering VIN quiescent current.
How does the LT3480MPMSE#TRPBF achieve 70µA quiescent current?
The LT3480MPMSE#TRPBF achieves 70µA quiescent current through Low Ripple Burst Mode® operation, which shuts down most internal circuitry between switching bursts at light loads. Additionally, when the BD pin is tied to VOUT (>3V), bias current is drawn from the output rail instead of VIN - further reducing input supply current. Both mechanisms are active simultaneously in typical 12VIN→3.3VOUT configurations.
What is the function of the exposed pad on the LT3480MPMSE#TRPBF MSOP package?
The exposed pad (Pin 11) on the LT3480MPMSE#TRPBF MSOP package is electrically and thermally connected to GND. It must be soldered directly to a PCB ground plane to achieve the specified thermal resistance (JC = 10°C/W). Proper soldering ensures reliable heat dissipation during 2A continuous operation and maintains signal integrity by minimizing ground impedance in high-di/dt switching paths.
Can LT3480MPMSE#TRPBF synchronize to an external clock?
Yes, the LT3480MPMSE#TRPBF supports external clock synchronization via the SYNC pin (Pin 6), accepting frequencies from 250kHz to 2MHz with fast edge rates (<1µs rise/fall time). When synchronized, it maintains tight phase alignment with system clocks - reducing beat frequencies and EMI in multi-rail power systems. Grounding SYNC enables autonomous Burst Mode operation for lowest IQ.
LT3480MPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3480MPMSE#TRPBF FAQ
1.How can I place an order for LT3480MPMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3480MPMSE#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 LT3480MPMSE#TRPBF reliable?
The price and inventory of LT3480MPMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3480MPMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3480MPMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3480MPMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3480MPMSE#TRPBF?
LT3480MPMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3480MPMSE#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 LT3480MPMSE#TRPBF?
For technical support, including LT3480MPMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3480MPMSE#TRPBF requirements.
6.How does Aetrix verify that LT3480MPMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3480MPMSE#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 LT3480MPMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3480MPMSE#TRPBF?
All LT3480MPMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3480MPMSE#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 LT3480MPMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT3480MPMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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