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Analog Devices Inc. LT3480MPMSE#PBF
- Part No.:
- LT3480MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3480MPMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,015
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Product details
Overview
LT3480MPMSE#PBF from Analog Devices (formerly Linear Technology) is a 36V, 2A monolithic step-down switching regulator in thermally enhanced 10-lead MSOP package with exposed pad. It features 2.4MHz max switching frequency, 70µA quiescent current in Burst Mode, integrated boost Schottky diode, and power good flag. Designed for automotive battery regulation and industrial supplies where high input voltage tolerance and low-noise light-load operation are critical.
For engineers reviewing the LT3480MPMSE#PBF datasheet, LT3480MPMSE#PBF pinout, LT3480MPMSE#PBF application, or LT3480MPMSE#PBF equivalent, key selection factors include its –55°C to 150°C extended temperature rating, 0.25Ω switch on-resistance, 0.790V feedback reference, adjustable frequency (200kHz–2.4MHz), and overvoltage lockout up to 38V with 60V transient survival capability.
Technical Context
The LT3480MPMSE#PBF employs current-mode control with internal 0.25Ω NPN bipolar switch and integrated boost diode driver, enabling efficient saturation at high input voltages. Its oscillator uses RT-pin resistor programming and supports external synchronization from 250kHz to 2MHz.
Burst Mode operation reduces quiescent current to 70µA while maintaining output ripple below 15mV; bias current can be drawn from VOUT when above 3V to further improve light-load efficiency. The device includes active soft-start via RUN/SS pin ramping, power good flag (86% VREF threshold), and overvoltage lockout that disables switching above 38V while sustaining 60V transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V continuous; survives 60V non-repetitive transients - enables direct connection to 24V/36V industrial or automotive batteries. |
| Output Current | Up to 2A - supports mid-power point-of-load conversion without external MOSFETs. |
| Switching Frequency | 200kHz to 2.4MHz (RT-programmable) - allows tradeoff between small magnetics (high fSW) and high VIN/VOUT ratio support (low fSW). |
| Quiescent Current | 70µA at 12VIN→3.3VOUT in Burst Mode - extends battery life in always-on portable or telematics systems. |
| Feedback Reference | 0.790V ±10mV - enables precise output setting from 0.79V to 20V using standard resistor dividers. |
| Thermal Rating | –55°C to +150°C junction - qualified for under-hood automotive, aerospace, and harsh industrial environments. |
| Power Good Flag | Open-collector PG asserts when FB reaches 86% of target - provides reliable system sequencing and fault detection. |
Pinout & Package
LT3480MPMSE#PBF is housed in a 10-lead plastic MSOP package with exposed thermal pad (Pin 11 = GND), optimized for low thermal resistance (θJA = 45°C/W, θJC = 10°C/W). The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (1) | Bias Diode Anode | Connects to boost Schottky anode; supplies bias current to internal regulator - draws power from VOUT if >3V, improving light-load efficiency. |
| BOOST (2) | Boost Capacitor Drive | Provides >VIN voltage to saturate internal NPN switch - requires external capacitor/diode network for full switch conduction. |
| SW (3) | Switch Node | Internal NPN collector output - connects to inductor, catch diode cathode, and boost capacitor - carries high di/dt switching current. |
| VIN (4) | Main Input Supply | Primary power source for internal regulator and switch - must be locally bypassed with ≥4.7µF ceramic capacitor. |
| RUN/SS (5) | Enable & Soft-Start Control | Logic-level shutdown input (0.2V low / 2.5V high); RC ramp generates controlled VOUT rise time during startup. |
| SYNC (6) | External Clock Input | Accepts TTL/CMOS clock (250kHz–2MHz) to synchronize switching - reduces EMI in multi-regulator systems. |
| PG (7) | Power Good Output | Open-collector flag signaling VOUT ≥86% of regulation - requires external pull-up; valid only when VIN >3.6V and RUN/SS high. |
| FB (8) | Feedback Input | Sense node regulated to 0.790V - connects to resistor divider tap; 7nA bias current enables high-impedance networks. |
| VC (9) | Error Amplifier Output | Compensation node controlling peak switch current - RC network to GND sets loop stability and transient response. |
| RT (10) | Frequency Set Resistor | Grounded resistor programs switching frequency (200kHz–2.4MHz) - value determines oscillator timing and duty-cycle limits. |
Key Features
| Feature | Design Value |
|---|---|
| Low-Ripple Burst Mode | Maintains <15mV output ripple at light loads while drawing only 70µA from VIN - eliminates audible noise and preserves regulation in standby. |
| Integrated Boost Diode Driver | Eliminates need for external bootstrap circuitry - simplifies layout and reduces BOM count for high-VIN buck designs. |
| Overvoltage Lockout (OVL) | Disables switching at >38V (min 36V) while surviving 60V transients - protects downstream circuitry in automotive load-dump scenarios. |
| Thermally Enhanced MSOP | 10-lead MSOP with exposed GND pad achieves θJC = 10°C/W - enables 2A operation without heatsink in compact industrial modules. |
| Adjustable Soft-Start | RUN/SS pin accepts RC network to control VOUT ramp rate - prevents inrush current and ensures clean power-up sequencing. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 24V truck battery supply to 5V/3.3V for infotainment ECUs under load-dump (60V) and cold-crank (3.6V) conditions. IC Role / Device Role / Timing Role: Primary step-down controller with OVL, Burst Mode, and extended temperature operation - manages power path during wide VIN transients. Use Value: Eliminates need for external TVS and pre-regulator stages; 70µA quiescent current meets ISO 16750-2 sleep mode requirements. |
Use Scenario: Local 12V-to-3.3V conversion for PLC I/O modules operating in factory environments with 0–85°C ambient and EMI-sensitive analog sensors. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter with SYNC input - enables synchronized switching across multiple rails to suppress beat frequencies. Use Value: 2.4MHz operation allows use of 2.2µH inductors, reducing board area by >40% vs. 500kHz alternatives; exposed pad ensures thermal reliability at full 2A load. |
| Portable Medical Equipment | Aerospace Power Management |
Use Scenario: Powering FPGA and ADC subsystems in handheld ultrasound devices powered by Li-ion (8.4V–12.6V) with strict battery life targets. IC Role / Device Role / Timing Role: Adjustable-frequency buck regulator with BD-pin bias sourcing - draws bias from 3.3V rail to minimize no-load losses. Use Value: 70µA Burst Mode IQ extends runtime by >30% vs. standard PWM regulators; 0.790V reference enables accurate low-voltage rail generation. |
Use Scenario: Ruggedized 28V aircraft bus regulation to 15V/5V for avionics interface cards requiring –55°C startup and radiation-tolerant design. IC Role / Device Role / Timing Role: Extended-temperature monolithic buck controller with 150°C junction rating and 60V transient immunity - serves as primary power conditioner. Use Value: LT3480MPMSE#PBF's –55°C to +150°C qualification eliminates derating concerns; exposed pad ensures stable thermal performance at altitude. |
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 × 4mm MSOP, 3.5µA IQ in pulse-skipping mode - lacks integrated boost diode and PG flag. | Lower output current; better ultra-low-IQ performance but no power-good signaling or 60V transient survival. | Select when lowest possible no-load consumption is critical and 60V transients are absent. |
| TPS54240DGQR | 40V input, 2A, SOIC-8, 115µA IQ, external FET drive - requires external high-side MOSFET and bootstrap circuit. | Higher design complexity and BOM cost; supports higher VIN but lacks integrated diode and thermal pad. | Select when board space permits SOIC-8 and external MOSFET optimization is preferred over monolithic simplicity. |
Compared with LTC3631EMSE#PBF and TPS54240DGQR, LT3480MPMSE#PBF uniquely combines 60V transient survival, integrated boost diode, power good flag, and –55°C to +150°C operation in a single MSOP package - making it optimal for ruggedized automotive, industrial, and aerospace DC/DC stages where reliability and integration outweigh ultra-low-IQ or external-FET flexibility.
Availability
LT3480MPMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and aerospace power management requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for LT3480MPMSE#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 legacy high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LT3480 product line delivers monolithic high-input-voltage buck regulators with integrated power switches and protection features - designed specifically for harsh-environment applications including automotive, industrial automation, and avionics where wide VIN range and extended temperature operation are mandatory.
FAQ
What is the maximum input voltage the LT3480MPMSE#PBF can withstand without damage?
The LT3480MPMSE#PBF has an absolute maximum VIN rating of 60V for non-repetitive transients (≤1 second), with overvoltage lockout disabling switching above 36V to 40V (typical 38V). Continuous operation is rated up to 36V. This 60V transient tolerance makes LT3480MPMSE#PBF suitable for automotive load-dump protection without external clamping components.
Does the LT3480MPMSE#PBF require an external Schottky diode?
No - the LT3480MPMSE#PBF integrates a boost Schottky diode driver and relies on an external Schottky diode connected between BD and BOOST pins. The diode itself is external (e.g., Diodes Inc. PDS360), but the drive circuitry, timing control, and bias path are fully integrated within LT3480MPMSE#PBF, eliminating need for discrete gate drivers or bootstrap capacitors.
How does the LT3480MPMSE#PBF achieve 70µA quiescent current?
The LT3480MPMSE#PBF achieves 70µA quiescent current through Low Ripple Burst Mode operation: during light loads, it discontinues switching bursts and shuts down internal control circuitry between pulses. Additionally, when VOUT exceeds 3V, LT3480MPMSE#PBF draws bias current from the output rail instead of VIN - further reducing input supply current in regulated systems.
What is the function of the exposed pad on the LT3480MPMSE#PBF MSOP package?
The exposed pad (Pin 11) on the LT3480MPMSE#PBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour for effective heat dissipation - achieving θJC = 10°C/W. This thermal path is essential to sustain 2A output current at high ambient temperatures and is required for compliance with the device's –55°C to +150°C junction rating.
Can the LT3480MPMSE#PBF be synchronized to an external clock?
Yes - the LT3480MPMSE#PBF supports external clock synchronization via the SYNC pin (Pin 6), accepting TTL/CMOS-compatible signals from 250kHz to 2MHz. When synchronized, LT3480MPMSE#PBF aligns its switching edges to the external clock, reducing beat frequencies and EMI in multi-rail systems. Grounding SYNC enables standalone Burst Mode operation.
LT3480MPMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3480MPMSE#PBF FAQ
1.How can I place an order for LT3480MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3480MPMSE#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 LT3480MPMSE#PBF reliable?
The price and inventory of LT3480MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3480MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3480MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3480MPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3480MPMSE#PBF?
LT3480MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3480MPMSE#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 LT3480MPMSE#PBF?
For technical support, including LT3480MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3480MPMSE#PBF requirements.
6.How does Aetrix verify that LT3480MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3480MPMSE#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 LT3480MPMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3480MPMSE#PBF?
All LT3480MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3480MPMSE#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 LT3480MPMSE#PBF part is unused and in its original packaging.
Return procedure for LT3480MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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