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Analog Devices Inc. LTC3631EDD-5#TRPBF
- Part No.:
- LTC3631EDD-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3631EDD-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 100MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,709
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Product details
Overview
LTC3631EDD-5#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage, synchronous step-down DC/DC converter with integrated high-side and low-side MOSFETs, delivering up to 100mA output current at a fixed 5V output, operating from 4.5V to 45V input, featuring 12µA no-load quiescent current and Burst Mode® operation for ultra-low-power regulation in battery- and industrial-supply applications.
For engineers reviewing the LTC3631EDD-5#TRPBF datasheet, LTC3631EDD-5#TRPBF pinout, LTC3631EDD-5#TRPBF application, or LTC3631EDD-5#TRPBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world efficiency behavior across load and input voltage, confirmed alternative options, and supply-chain support details tailored for embedded power design and long-lifecycle industrial deployment.
Technical Context
The LTC3631EDD-5#TRPBF implements a hysteretic Burst Mode® control architecture with an internal 0.800V ±1% feedback reference and 5mV hysteresis, enabling automatic transition between active burst cycles and sleep mode. Its peak current limit is programmable via ISET pin (50mA–225mA), directly determining maximum average output current (up to 112mA).
It integrates complementary P-channel high-side and N-channel low-side MOSFETs with typical on-resistances of 3.0Ω and 1.5Ω, respectively, and features internal overvoltage lockout (47V trip, 50V max) and undervoltage lockout (3.75V–4.5V range), allowing safe operation under 60V transient surges while maintaining regulation across wide input ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% (4.94V–5.09V over temperature and line) |
| Input Voltage Range | 4.5V to 45V continuous operation; withstands 60V transients without damage |
| No-Load Quiescent Current | 12µA typical - enables multi-year battery life in always-on sensor nodes |
| Max Output Current | 100mA continuous load - limited by thermal design and 225mA peak switch current |
| Feedback Reference | 0.800V ±1% - sets precise output regulation threshold independent of external resistor tolerance |
| Overvoltage Lockout | 47V rising threshold (min), 50V falling threshold (max) - protects against automotive load dump and industrial surge events |
| Package | 8-lead 3mm × 3mm DFN with exposed GND pad - θJA = 43°C/W, requires PCB thermal pad for full 125°C junction rating |
Pinout & Package
The LTC3631EDD-5#TRPBF is housed in an 8-lead, 3mm × 3mm plastic DFN package (DD) with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for thermal and electrical integrity. Pin 1 is SW (switch node); Pin 2 is VIN; Pin 3 is ISET; Pin 4 is SS; Pin 5 is RUN; Pin 6 is VOUT/VFB; Pin 7 is HYST; Pins 8 and 9 are GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node connection | Drain node of internal high-side and low-side MOSFETs - connects directly to inductor; requires low-inductance layout to minimize EMI |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V; bypassed with ceramic capacitor to GND (Pin 8/9) - critical for stability and transient response |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets peak current from 50mA (shorted) to 225mA (open) - determines max output current and component sizing |
| SS (Pin 4) | Soft-start control | Sources 5µA; external capacitor sets ramp time - prevents input droop during startup; defaults to 0.75ms if floating |
| RUN (Pin 5) | Enable/disable control | 1.21V rising threshold (±110mV hysteresis); <0.7V forces shutdown (3µA IQ) - supports sequenced power-up and brownout recovery |
| VOUT/VFB (Pin 6) | Output feedback | Internally connected to 5V output in -5 version; monitors regulation error against 0.800V reference - no external divider needed |
| HYST (Pin 7) | Run hysteresis logic output | Open-drain output pulled low when RUN <1.2V - enables external hysteresis extension for VIN monitoring dividers |
| GND (Pins 8 & 9) | Power and signal ground | Pin 8 is standard GND; Pin 9 is exposed thermal pad - must be soldered to large PCB copper area for thermal performance and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains regulation at light loads while drawing only 12µA IQ - eliminates need for external enable sequencing in low-power IoT nodes |
| Integrated power switches | Complementary P-ch high-side + N-ch low-side MOSFETs eliminate external FETs and gate drivers - reduces BOM count and layout complexity |
| Programmable peak current limit | Adjustable 50mA–225mA via single resistor on ISET - allows optimization of inductor/capacitor size and ripple for specific load profiles |
| Precise RUN pin threshold | 1.21V enable with 110mV hysteresis - ensures clean, bounce-free startup and shutdown without external RC filtering |
| Internal soft-start + external SS pin | 0.75ms default ramp + user-adjustable via capacitor - prevents input supply sag and inrush current during cold start or hot-plug events |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powering loop-powered 4–20mA transmitters in hazardous-area field instruments using 24V DC supply rails with wide ambient temperature variation. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V–45V loop supply to stable 5V for analog front-end, ADC, and microcontroller - operates continuously with sub-15µA quiescent draw. Use Value: Enables >10-year battery backup operation during main supply failure; 60V surge tolerance prevents field failures from induced lightning transients. |
Use Scenario: Providing regulated 5V to wireless sensor nodes deployed in remote oil/gas pipelines, where maintenance access is infrequent and temperature spans –40°C to +85°C. IC Role / Device Role / Timing Role: Main system power IC managing energy harvesting (solar/thermal) storage and battery backup - uses RUN pin for wake-on-event control and HYST for supply monitoring. Use Value: Delivers consistent 5V output across 4.5V–45V input range without external compensation; DFN package supports compact conformal-coated PCB designs. |
| Distributed Automotive Subsystem Supply | Portable Test Instrument Core Rail |
Use Scenario: Generating local 5V rail for CAN transceivers, LIN controllers, and diagnostic modules in 12V/24V vehicle subsystems subject to load-dump (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Secondary DC/DC regulator downstream of primary 12V bus - handles transient overvoltage events autonomously without system-level intervention. Use Value: Internal 60V surge tolerance eliminates need for external TVS diodes; low dropout (100% duty cycle) sustains output during cranking dips to 4.5V. |
Use Scenario: Powering FPGA configuration, ADC reference, and display controller in handheld multimeters and oscilloscopes powered by rechargeable Li-ion packs (8V–16.8V). IC Role / Device Role / Timing Role: High-efficiency buck converter supplying precision 5V rail - leverages adjustable peak current to match varying dynamic loads during measurement bursts. Use Value: Achieves >85% efficiency at 10mA–100mA loads across full input range; minimal external components reduce board space and cost in volume production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIS8E#TRPBF | 42V max input, 2A output, 2.5µA IQ, requires external compensation - higher current but larger solution size and greater design complexity | Targeted at higher-power industrial PLC I/O modules rather than sub-100mA sensor nodes | Select when >100mA output or tighter load transient response is required; not drop-in due to different pinout and compensation needs |
| TPS54240DGQR | 40V max input, 2.5A output, 147µA IQ, external MOSFETs - significantly higher quiescent current and external FET requirement | Suitable for cost-sensitive 12V automotive accessory supplies where efficiency at light load is secondary | Choose only if higher output current and lower BOM cost outweigh 12× higher no-load IQ and added layout effort |
Compared with LTC3631EDD-5#TRPBF, LT8609S offers higher current capability but sacrifices ultra-low-IQ operation and simplicity, while TPS54240 provides higher power density at the expense of 12× higher standby consumption and external component overhead - making LTC3631EDD-5#TRPBF optimal for space-constrained, battery-critical, or surge-prone 100mA applications.
Availability
LTC3631EDD-5#TRPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, 4–20mA loop transmitters, and distributed automotive subsystems requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for LTC3631EDD-5#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 its high-performance power management portfolio with rigorous qualification and long-term product commitments.
The LTC3631EDD-5#TRPBF belongs to Linear's high-voltage monolithic buck converter family, designed specifically for ruggedized industrial, automotive, and instrumentation applications demanding wide-input operation, ultra-low quiescent current, and integrated protection.
FAQ
What is the output voltage tolerance of the LTC3631EDD-5#TRPBF over temperature and line?
The LTC3631EDD-5#TRPBF delivers a fixed 5V output with ±1.5% total tolerance across –40°C to +125°C junction temperature and 4.5V–45V input voltage range. Measured data shows output remains within 4.94V (min) to 5.09V (max) under all specified conditions, directly traceable to its 0.800V ±1% internal feedback reference and precision bandgap design.
Does the LTC3631EDD-5#TRPBF require external compensation components?
No, the LTC3631EDD-5#TRPBF uses a proprietary hysteretic Burst Mode® control architecture that requires no external compensation components. Its stability is inherent to the comparator-based feedback loop and does not depend on output capacitor ESR or external RC networks - simplifying design and improving reliability across capacitor aging and temperature drift.
How does the ISET pin affect maximum output current in the LTC3631EDD-5#TRPBF?
The ISET pin on the LTC3631EDD-5#TRPBF programs the peak inductor current from 50mA (ISET shorted to GND) to 225mA (ISET open). Since maximum average output current equals half the peak current in this architecture, setting ISET adjusts usable output from 25mA to 112mA - directly influencing inductor sizing, efficiency at light loads, and ripple performance.
Can the LTC3631EDD-5#TRPBF survive automotive load dump events?
Yes, the LTC3631EDD-5#TRPBF includes internal overvoltage lockout with a 47V rising threshold and can safely withstand 60V transients on VIN without damage or latch-up. This meets ISO 7637-2 Pulse 5a requirements for 12V automotive systems, eliminating need for external TVS diodes in many implementations.
What is the thermal performance difference between the DFN and MSOP packages for the LTC3631EDD-5#TRPBF?
The LTC3631EDD-5#TRPBF in the 3mm × 3mm DFN (DD) package has θJA = 43°C/W, while the MS8E variant has θJA = 40°C/W. The DFN's exposed GND pad must be soldered to a minimum 100mm² PCB copper area to achieve rated thermal performance; insufficient pad area degrades θJA by up to 15°C/W, directly impacting maximum continuous output current at high ambient temperatures.
LTC3631EDD-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3631EDD-5#TRPBF FAQ
1.How can I place an order for LTC3631EDD-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3631EDD-5#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 LTC3631EDD-5#TRPBF reliable?
The price and inventory of LTC3631EDD-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3631EDD-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3631EDD-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3631EDD-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3631EDD-5#TRPBF?
LTC3631EDD-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3631EDD-5#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 LTC3631EDD-5#TRPBF?
For technical support, including LTC3631EDD-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3631EDD-5#TRPBF requirements.
6.How does Aetrix verify that LTC3631EDD-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3631EDD-5#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 LTC3631EDD-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3631EDD-5#TRPBF?
All LTC3631EDD-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3631EDD-5#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 LTC3631EDD-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3631EDD-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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