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Analog Devices Inc. LT3480HMSE#PBF
- Part No.:
- LT3480HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3480HMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,807
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Product details
Overview
LT3480HMSE#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 operates from 3.6V to 36V input, delivers adjustable output from 0.79V to 20V, and targets automotive battery regulation and industrial distributed supplies requiring high efficiency at light loads.
For engineers reviewing the LT3480HMSE#PBF datasheet, LT3480HMSE#PBF pinout, LT3480HMSE#PBF application, or LT3480HMSE#PBF equivalent, key selection criteria include its –40°C to 150°C extended temperature rating, 0.25Ω switch on-resistance, power good flag, soft-start via RUN/SS pin, and synchronization capability from 250kHz to 2MHz.
Technical Context
The LT3480HMSE#PBF implements constant-frequency current-mode PWM control with an internal 0.25Ω NPN bipolar power switch and integrated boost Schottky diode driver. Its oscillator is resistor-programmable (200kHz–2.4MHz via RT pin), and it features frequency foldback during startup/overload to limit peak inductor current.
Burst Mode operation reduces quiescent current to 70µA at 12VIN/3.3VOUT while maintaining output ripple below 15mV; bias current can be drawn from VOUT when >3V to further improve light-load efficiency. The device includes overvoltage lockout (36V min, 38V typ), power good flag (86% VFB threshold), and soft-start controlled by external RC 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 24V/36V industrial or automotive batteries. |
| Max Output Current | 2A - supports mid-power point-of-load conversion for FPGAs, DSPs, or sensor subsystems. |
| Switching Frequency | 200kHz to 2.4MHz (RT-programmable) - allows tradeoff between small magnetics (high fSW) and high input voltage tolerance (low fSW). |
| Quiescent Current | 70µA in Burst Mode at 12VIN/3.3VOUT - extends battery life in always-on portable or telematics systems. |
| Feedback Reference | 0.790V ±10mV - enables precise output regulation down to sub-1V levels with standard resistor dividers. |
| Thermal Rating | –40°C to +150°C junction - qualified for under-hood automotive and high-ambient industrial environments. |
| Power Good Flag | Open-collector PG asserts when VOUT reaches 86% of target - provides reliable system power sequencing without external monitoring. |
Pinout & Package
LT3480HMSE#PBF is housed in a thermally enhanced 10-lead MSOP package (3mm × 3mm footprint) with exposed pad (Pin 11) soldered to PCB for low thermal resistance (θJA = 45°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BD (1) | Boost Diode Anode Supply | Provides bias current to internal regulator; connects to boost capacitor anode; draws current from VOUT if >3V to improve light-load efficiency. |
| BOOST (2) | Bootstrap Drive Voltage | Supplies elevated gate drive to internal NPN switch via external capacitor/diode; enables full saturation at high VIN. |
| SW (3) | Switch Node | Drives external inductor and catch diode; carries high di/dt switching current - requires tight layout and low-inductance path. |
| VIN (4) | Main Input Supply | Primary power source for internal regulator and switch; must be locally bypassed with ≥4.7µF X7R ceramic capacitor. |
| RUN/SS (5) | Enable & Soft-Start Control | Shuts down device when <0.2V; enables operation at ≥2.5V; external RC ramp sets controlled VOUT rise time. |
| SYNC (6) | External Clock Input | Accepts TTL/CMOS clock (250kHz–2MHz); forces synchronous operation to reduce EMI or avoid beat frequencies. |
| PG (7) | Power Good Output | Open-collector flag pulled high externally; goes high when FB reaches 86% of 0.790V - signals valid regulation. |
| FB (8) | Feedback Input | Senses output via resistor divider; regulated to 0.790V - determines final VOUT accuracy and loop stability. |
| VC (9) | Error Amplifier Output | Controls peak switch current; used for loop compensation with external RC network to ground. |
| RT (10) | Frequency Set Resistor | Connects to ground to program switching frequency (e.g., 8.66kΩ = 2.4MHz); sets oscillator timing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Schottky Diode | Eliminates need for external bootstrap diode - reduces BOM count and PCB area in compact designs. |
| Low Ripple Burst Mode® | Maintains <15mV output ripple at light loads while achieving 70µA IQ - critical for noise-sensitive analog or RF subsystems. |
| Saturating Switch Design | 0.25Ω typical RCE(SAT) at 2A - minimizes conduction loss and thermal rise in high-current applications. |
| Overvoltage Lockout | Disables switching above 36V (min) - protects downstream circuitry during load dump or battery jump-start events. |
| Exposed Pad Thermal Management | 10-lead MSOP with soldered exposed pad (Pin 11 = GND) - achieves θJC = 10°C/W for reliable operation at 150°C junction. |
Applications
| Automotive Battery Regulation | Industrial Distributed Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery to 3.3V/5V for infotainment MCU, CAN transceiver, or camera module. IC Role / Device Role / Timing Role: Primary DC/DC buck converter providing isolated, efficient, and transient-robust power rail. Use Value: Withstands 60V load-dump transients and operates reliably from –40°C to +150°C - meets AEC-Q100 stress requirements for under-hood placement. | Use Scenario: Generating local 5V or 12V rails from 24V/36V factory automation bus for PLC I/O modules or motor drivers. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator delivering stable, low-noise power in space-constrained DIN-rail enclosures. Use Value: 2.4MHz max switching frequency enables use of 2.2µH inductors and 4.7µF ceramic capacitors - reduces solution size by >40% vs. 500kHz alternatives. |
| Portable Product Power | Medical Sensor Supply |
Use Scenario: Powering handheld diagnostic devices or portable data loggers with Li-ion or 2-cell alkaline inputs. IC Role / Device Role / Timing Role: Main system regulator managing battery-to-logic voltage conversion with ultra-low standby consumption. Use Value: 70µA Burst Mode IQ extends runtime in sleep mode; soft-start prevents inrush into capacitive loads like LCD bias rails. | Use Scenario: Supplying precision analog front-ends (AFE), ADCs, or low-noise op-amps in patient-worn biosensors. IC Role / Device Role / Timing Role: Low-ripple, low-noise power source ensuring signal integrity in millivolt-level physiological measurements. Use Value: <15mV output ripple in Burst Mode avoids introducing switching artifacts into ECG/EEG waveforms - eliminates need for post-regulation LDO filtering. |
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, 25µA IQ | Lower current, higher frequency, requires external bootstrap diode - better for ultra-compact, low-IQ apps where 1.5A suffices | Select if minimum board area and lowest possible quiescent current are prioritized over 2A output and integrated diode convenience. |
| MP2451DT-LF-Z | 36V input, 2A, 2.2MHz max fSW, no PG flag, no SYNC, 120µA IQ, smaller TSOT23-6 | No power good or synchronization; higher IQ; lacks thermal grade - suited for cost-sensitive consumer apps without safety-critical sequencing | Choose when PG flag and automotive temp range are unnecessary, and BOM cost reduction outweighs feature completeness. |
Compared with LTC3631EMSE#PBF and MP2451DT-LF-Z, the LT3480HMSE#PBF uniquely combines 2A output, integrated boost diode, power good flag, –40°C to +150°C rating, and 70µA Burst Mode IQ - making it optimal for ruggedized industrial and automotive point-of-load designs where reliability and feature integration are non-negotiable.
Availability
LT3480HMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supply, and portable product power applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3480HMSE#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT3480 product line was designed specifically for high-input-voltage, high-efficiency buck conversion in harsh environments - emphasizing robustness, wide temperature operation, and integrated functionality to simplify power design in automotive and industrial systems.
FAQ
What is the maximum input voltage the LT3480HMSE#PBF can safely withstand?
The LT3480HMSE#PBF has an absolute maximum VIN rating of 60V for nonrepetitive transients (e.g., automotive load dump), with overvoltage lockout engaging at 36V minimum (38V typical) to disable switching and protect downstream circuitry. Continuous operation is rated up to 36V, and the device maintains functionality across its full –40°C to +150°C junction temperature range under these conditions. This makes the LT3480HMSE#PBF suitable for 24V and 36V industrial and automotive battery-fed systems.
Does the LT3480HMSE#PBF require an external bootstrap diode?
No, the LT3480HMSE#PBF integrates a boost Schottky diode driver and does not require an external bootstrap diode. The BD pin connects directly to the anode of the external boost capacitor, and the internal circuitry uses this node to generate the elevated gate drive voltage for the internal NPN switch. This integration reduces component count, PCB area, and potential failure points - a key differentiator versus many competing controllers that mandate external diodes.
How does the LT3480HMSE#PBF achieve 70µA quiescent current?
The LT3480HMSE#PBF achieves 70µA quiescent current through Low Ripple Burst Mode® operation, which disables most internal circuitry between switching bursts at light loads while maintaining tight output regulation and sub-15mV ripple. Additionally, when the BD pin voltage exceeds 3V (e.g., when tied to VOUT), the device draws bias current from the output rail instead of VIN - further reducing input supply current. This dual mechanism is confirmed in the datasheet's Electrical Characteristics table under "Quiescent Current from VIN" at VBD = 3V.
Can the LT3480HMSE#PBF synchronize to an external clock?
Yes, the LT3480HMSE#PBF supports external clock synchronization via the SYNC pin (Pin 6), accepting TTL/CMOS-compatible signals from 250kHz to 2MHz. When driven by an external clock, the device locks its internal oscillator to the input frequency - enabling EMI reduction through frequency dithering or avoidance of sensitive bands. The datasheet specifies rise/fall times faster than 1µs and defines logic thresholds of 0.5V (low) and 0.7V (high), ensuring compatibility with standard microcontroller or clock generator outputs.
What is the purpose of the exposed pad on the LT3480HMSE#PBF MSOP package?
The exposed pad (Pin 11) on the LT3480HMSE#PBF's 10-lead MSOP package is electrically connected to GND and must be soldered to a PCB thermal pad to achieve specified thermal performance. With θJA = 45°C/W and θJC = 10°C/W, this pad provides the primary heat dissipation path - essential for sustaining 2A output current at high ambient temperatures up to +150°C junction. Omitting pad soldering risks thermal shutdown or premature failure under sustained load.
LT3480HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT3480HMSE#PBF FAQ
1.How can I place an order for LT3480HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3480HMSE#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 LT3480HMSE#PBF reliable?
The price and inventory of LT3480HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3480HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3480HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3480HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3480HMSE#PBF?
LT3480HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3480HMSE#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 LT3480HMSE#PBF?
For technical support, including LT3480HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3480HMSE#PBF requirements.
6.How does Aetrix verify that LT3480HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3480HMSE#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 LT3480HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3480HMSE#PBF?
All LT3480HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3480HMSE#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 LT3480HMSE#PBF part is unused and in its original packaging.
Return procedure for LT3480HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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