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Analog Devices Inc. LT3480IMSE#PBF
- Part No.:
- LT3480IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3480IMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,907
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Product details
Overview
LT3480IMSE#PBF from Analog Devices (formerly Linear Technology) is a 36V, 2A monolithic step-down switching regulator with current-mode control, 2.4MHz max switching frequency, 70µA quiescent current in Burst Mode, and integrated boost Schottky diode. It delivers regulated power in automotive battery systems, portable electronics, and industrial distributed supplies where high input voltage tolerance and low-noise light-load operation are required.
For engineers reviewing the LT3480IMSE#PBF datasheet, LT3480IMSE#PBF pinout, LT3480IMSE#PBF application, or LT3480IMSE#PBF equivalent, key selection criteria include its 3.6V–36V input range, 0.25Ω switch on-resistance, 0.790V feedback reference, power good flag, soft-start via RUN/SS pin, and thermal performance in the 10-lead MSOP package with exposed pad.
Technical Context
The LT3480IMSE#PBF implements constant-frequency current-mode PWM control with an internal 0.25Ω NPN bipolar switch, oscillator programmable from 200kHz to 2.4MHz via RT pin resistor, and active VC-pin-based peak-current limiting. Its Burst Mode operation reduces input supply current to 70µA at light loads while maintaining output ripple below 15mV.
It features overvoltage lockout (36V min, 38V typ), shutdown current <1µA, bias sourcing from BD pin when VOUT >3V, and power-good flag triggered at 86% of programmed output voltage. The IC supports external synchronization (250kHz–2MHz) and includes integrated boost diode drive for efficient switch saturation.
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 or automotive batteries. |
| Max Output Current | 2A - sufficient for powering microcontrollers, FPGAs, and analog subsystems without external current boosting. |
| Switching Frequency | 200kHz to 2.4MHz (adjustable via RT pin) - allows trade-off 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 IoT edge devices. |
| Feedback Reference | 0.790V ±10mV - enables precise output regulation from 0.79V to 20V using standard resistor dividers. |
| Power Good Flag | Open-collector PG output asserting at 86% of target VOUT - provides reliable system-level power sequencing and fault detection. |
| Thermal Package | 10-lead MSOP with exposed pad (θJA = 45°C/W) - supports >2A continuous operation at ambient up to 85°C with minimal PCB copper. |
Pinout & Package
LT3480IMSE#PBF is housed in a thermally enhanced 10-lead MSOP package (3mm × 3mm footprint) with exposed pad (Pin 11) soldered to PCB ground for low thermal resistance (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (1) | Bias Diode Anode Input | Supplies internal regulator; connects to boost diode anode and optionally to VOUT ≥3V to reduce IQ. |
| BOOST (2) | Boost Capacitor Drive | Provides >VIN voltage to saturate internal NPN switch; requires external capacitor + Schottky diode. |
| SW (3) | Switch Node | High-current output of internal power switch; connects to inductor, catch diode, and boost capacitor. |
| VIN (4) | Main Power Input | Supplies internal regulator and switch; must be locally bypassed with ≥4.7µF ceramic capacitor. |
| RUN/SS (5) | Enable & Soft-Start Control | Logic-level enable (≥2.5V = ON); RC network here sets controlled VOUT ramp during startup. |
| SYNC (6) | External Clock Input | Accepts 250kHz–2MHz clock for EMI reduction or multi-regulator synchronization. |
| PG (7) | Power Good Output | Open-collector flag pulled high externally; asserts when VOUT reaches 86% of regulation target. |
| FB (8) | Feedback Input | Sense node regulated to 0.790V; connects to resistor divider from VOUT for adjustable output voltage. |
| VC (9) | Error Amplifier Output | Controls peak switch current; external RC compensation network stabilizes loop dynamics. |
| RT (10) | Oscillator Frequency Set | Resistor-to-ground sets switching frequency (e.g., 8.66kΩ = 2.4MHz). |
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 efficiency in standby. |
| Integrated Boost Diode Drive | Eliminates need for external bootstrap circuitry; enables full saturation of internal 0.25Ω NPN switch across full input range. |
| Overvoltage Lockout | Disables switching above 36V (min), protecting downstream circuitry during load dump or surge events in automotive applications. |
| Adjustable Soft-Start | Controlled VOUT ramp via RUN/SS pin RC network prevents inrush current and output overshoot during power-up. |
| Power Good Flag with Hysteresis | PG asserts at 86% of target VOUT with 12mV hysteresis - ensures robust power sequencing without false triggering during line/load transients. |
Applications
| Automotive Battery Regulation | Portable Product Power |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V/5V for infotainment MCU and sensors under cold-crank (≤3.6V) and load-dump (≤60V) conditions. IC Role / Device Role / Timing Role: Primary buck converter with OVP, wide VIN tolerance, and Burst Mode for low-power sleep states. Use Value: Eliminates need for pre-regulator or TVS clamping stages; maintains regulation across full automotive transient profile per ISO 7637-2. |
Use Scenario: Powering handheld medical monitors or ruggedized test equipment powered by Li-ion or 2-cell alkaline packs. IC Role / Device Role / Timing Role: Main system regulator delivering 2A peak to ARM Cortex-M7 SoC and ADC front-end. Use Value: 70µA IQ extends runtime in battery-backed sleep mode; 2.4MHz operation enables use of 1.0×1.0mm inductors for ultra-compact layout. |
| Distributed Supply Regulation | Industrial Supplies |
Use Scenario: Local point-of-load conversion in PLC backplanes or modular I/O systems where 24V rail feeds multiple isolated 5V/3.3V domains. IC Role / Device Role / Timing Role: Non-isolated buck stage providing clean, sequenced power to FPGA configuration banks and interface PHYs. Use Value: PG flag enables interlocked power-up sequencing; SYNC pin allows jitter reduction across multiple LT3480IMSE#PBF units on same board. |
Use Scenario: Replacing aging linear regulators in factory automation controllers requiring 36V input compatibility and thermal reliability at 85°C ambient. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter replacing LM317-based solutions in DIN-rail mounted power modules. Use Value: 2A capability and 150°C junction rating (H-grade variant available) ensure stable operation in enclosed enclosures without forced air cooling. |
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 fSW, no integrated boost diode drive, lower IQ (25µA) | Requires external bootstrap components; better suited for space-constrained designs needing higher fSW | Select when ultra-low IQ and smaller inductors outweigh need for integrated boost drive |
| MP2451DT-LF-Z | 36V input, 2A, 2MHz max fSW, no PG flag, no SYNC, higher typical IQ (120µA) | Lacks power sequencing and EMI control features; lower BOM cost but reduced system-level integration | Select for cost-sensitive industrial controls where PG/SYNC are not required |
Compared with LTC3631EMSE#PBF and MP2451DT-LF-Z, the LT3480IMSE#PBF uniquely combines integrated boost diode drive, PG flag, and 2.4MHz programmability in a single 10-lead MSOP - simplifying design for automotive and portable applications demanding both robustness and feature completeness.
Availability
LT3480IMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, portable product power, and industrial supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3480IMSE#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 full technical and manufacturing continuity for all Linear power products, including rigorous AEC-Q200 stress testing for automotive-qualified variants.
The LT3480IMSE#PBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for harsh-environment applications requiring wide input range, low IQ, and integrated power-stage optimization - especially in automotive, industrial, and portable systems.
FAQ
What is the maximum input voltage the LT3480IMSE#PBF can safely withstand?
The LT3480IMSE#PBF operates continuously up to 36V input and safely withstands non-repetitive transients up to 60V. Its overvoltage lockout activates at 36V minimum (38V typical), disabling switching to protect internal circuitry while sustaining the high-voltage event. This makes the LT3480IMSE#PBF suitable for automotive load-dump protection without external clamping.
Does the LT3480IMSE#PBF require an external Schottky diode?
No - the LT3480IMSE#PBF integrates boost Schottky diode drive circuitry but requires an external Schottky diode connected between BD and BOOST pins to generate the boosted gate drive voltage. The internal switch is a bipolar NPN transistor; the external diode enables full saturation and low conduction loss across the full input range. No catch diode is needed as SW drives the inductor directly.
How does the LT3480IMSE#PBF achieve 70µA quiescent current?
The LT3480IMSE#PBF achieves 70µA IQ in Burst Mode by completely disabling the oscillator, error amplifier, and gate driver between energy bursts, leaving only essential bias circuitry active. During each burst, it delivers just enough energy to maintain output regulation before returning to ultra-low-power sleep - reducing average input current while keeping output ripple below 15mV in typical applications.
Can the LT3480IMSE#PBF be synchronized to an external clock?
Yes - the LT3480IMSE#PBF supports external synchronization via the SYNC pin, accepting clock signals from 250kHz to 2MHz. When synchronized, it aligns its switching edges to the external source, enabling EMI reduction through frequency harmonization and multi-phase operation across multiple LT3480IMSE#PBF units on the same PCB without beat-frequency interference.
What is the function of the BD pin on the LT3480IMSE#PBF?
The BD pin on the LT3480IMSE#PBF serves two functions: (1) it connects to the anode of the external boost Schottky diode to generate the BOOST voltage, and (2) it supplies bias current to the internal regulator. When VOUT exceeds 3V, bias current is drawn from BD instead of VIN - improving light-load efficiency. BD must be bypassed with a 1µF low-ESR capacitor if not tied directly to VOUT.
LT3480IMSE#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3480IMSE#PBF FAQ
1.How can I place an order for LT3480IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3480IMSE#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 LT3480IMSE#PBF reliable?
The price and inventory of LT3480IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3480IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3480IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3480IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3480IMSE#PBF?
LT3480IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3480IMSE#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 LT3480IMSE#PBF?
For technical support, including LT3480IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3480IMSE#PBF requirements.
6.How does Aetrix verify that LT3480IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3480IMSE#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 LT3480IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3480IMSE#PBF?
All LT3480IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3480IMSE#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 LT3480IMSE#PBF part is unused and in its original packaging.
Return procedure for LT3480IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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