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Analog Devices Inc. LTC3631EMS8E-5#TRPBF
- Part No.:
- LTC3631EMS8E-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3631EMS8E-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,709
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Product details
Overview
LTC3631EMS8E-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 industrial sensors and battery-backed systems.
For engineers reviewing the LTC3631EMS8E-5#TRPBF datasheet, LTC3631EMS8E-5#TRPBF pinout, LTC3631EMS8E-5#TRPBF application, or LTC3631EMS8E-5#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed efficiency vs. load curves, exact MS8E package thermal metrics, and two rigorously cross-checked alternative parts for 5V, 100mA high-input-voltage buck conversion.
Technical Context
The LTC3631EMS8E-5#TRPBF implements a hysteretic Burst Mode® control architecture with an internal 0.800V ±1% feedback reference and 5mV comparator hysteresis, enabling automatic transition between active switching bursts and 12µA sleep mode. Its peak current limit is programmable via ISET pin (50–225mA), and average output current is capped at half the peak limit - confirming 100mA max output under typical 225mA peak configuration.
It integrates P-channel high-side and N-channel low-side MOSFETs with on-resistances of 3.0Ω and 1.5Ω respectively, supports 100% duty-cycle low-dropout operation, and includes dedicated RUN and HYST pins for precise enable threshold (1.21V rising / 1.10V falling) and adjustable hysteresis - all within a thermally enhanced 8-lead MSOP (MS8E) package with exposed GND pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial rails, automotive batteries, and PoE-derived supplies without external pre-regulation. |
| Output Voltage | Fixed 5V ±1.5% - guaranteed over full –40°C to 125°C junction temperature range per datasheet Table 1. |
| No-Load Quiescent Current | 12µA typical - enables multi-year battery life in always-on remote sensors and metering devices. |
| Max Output Current | 100mA - derived from 225mA peak current limit and architecture constraint (IOUT(AVG) ≤ 0.5 × IPEAK). |
| Overvoltage Lockout | 50V rising threshold - protects against 60V transients while maintaining regulation up to 45V nominal input. |
| Feedback Reference | 0.800V ±1% - precision reference enables accurate output voltage setting with minimal resistor tolerance impact. |
| Package Thermal Resistance | θJA = 40°C/W - measured on standard 2-layer JEDEC board, enabling reliable 100mA operation at 85°C ambient without heatsink. |
Pinout & Package
The LTC3631EMS8E-5#TRPBF is housed in an 8-lead plastic MSOP (MS8E) package with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for optimal thermal performance (θJC = 5–10°C/W) and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connection point for external inductor; carries high di/dt switching waveform - requires tight layout and Kelvin grounding. |
| VIN (Pin 2) | Main Input Supply | Accepts 4.5V–45V input; bypassed with ceramic capacitor directly to GND (Pin 8) for stability and noise suppression. |
| ISET (Pin 3) | Peak Current Programming | Sources 1µA; resistor to GND sets peak current from 50mA (shorted) to 225mA (open) - determines max output capability and component sizing. |
| SS (Pin 4) | Soft-Start Control | Sources 5µA; external capacitor sets ramp time - default internal soft-start is 0.75ms if floating. |
| RUN (Pin 5) | Enable/Shutdown Control | Active-high logic: >1.21V enables operation; <0.7V forces shutdown (3µA IQ); hysteresis ensures clean power sequencing. |
| VOUT/VFB (Pin 6) | Output Feedback | Internally connected to 5V output in fixed-version parts; serves as error amplifier input referenced to 0.800V. |
| HYST (Pin 7) | Run Hysteresis Output | Open-drain logic output pulled low when RUN < 1.2V - used to add external hysteresis via resistor divider to RUN pin. |
| GND (Pin 8) | Signal Ground | Primary ground return for control circuitry; must be tied to exposed pad (Pin 9) and system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Maintains regulation at light loads while drawing only 12µA - eliminates need for external enable cycling in low-power IoT nodes. |
| Integrated Power Switches | Eliminates external MOSFETs and gate drivers - reduces BOM count to just inductor, input/output caps, and optional ISET resistor. |
| Precision RUN Threshold | 1.21V rising / 1.10V falling with 110mV hysteresis - enables robust brown-in/brown-out detection without external comparators. |
| Internal Overvoltage Protection | Locks out switching above 50V (rising) - sustains 60V transients safely, simplifying front-end protection in 24V/48V industrial systems. |
| No Compensation Required | Stable with standard ceramic output capacitors - removes loop compensation design effort and sensitivity to ESR variation. |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Node |
|---|---|
Use Scenario: Powering a loop-powered pressure transmitter with 4–20mA analog output and microcontroller-based diagnostics. IC Role / Device Role / Timing Role: Primary 5V regulator sourcing sensor signal conditioning, ADC, and digital interface - operates continuously from 24V loop supply. Use Value: 12µA quiescent current ensures loop compliance even at 4mA minimum, while 45V input rating handles field wiring surges. | Use Scenario: Battery-operated wireless vibration sensor deployed in factory machinery with 10+ year lifetime target. IC Role / Device Role / Timing Role: Main system regulator supplying MCU, RF transceiver, and MEMS accelerometer - enters Burst Mode during sleep intervals. Use Value: Ultra-low IQ extends coin-cell or LiSOCl₂ battery life; 45V tolerance allows use with energy-harvesting boost stages. |
| Automotive Body Control Module | Distributed Power System |
Use Scenario: Regulating 5V for CAN transceiver and microcontroller in under-hood lighting control unit exposed to load dump. IC Role / Device Role / Timing Role: Secondary buck converter downstream of main 12V rail - provides isolated, low-noise 5V domain. Use Value: 60V surge tolerance eliminates need for TVS diode; MS8E package fits tight space constraints near connectors. | Use Scenario: Point-of-load regulation for FPGA I/O banks in telecom base station card with 36–48V backplane input. IC Role / Device Role / Timing Role: Compact, efficient 5V source replacing discrete buck controller + MOSFET solution - mounted directly beside load. Use Value: Integrated switches and no-compensation design reduce layout area by >40% versus controller-based alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5V, 100mA high-input-voltage buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3692EMSE-5#TRPBF | Higher 200mA output, 3.5MHz fixed-frequency PWM, requires external compensation, 32µA IQ. | Preferred where predictable EMI profile and higher current are needed; less suitable for ultra-low-IQ battery apps. | Select LT3692EMSE-5#TRPBF when fixed-frequency operation and >100mA load margin are required - not drop-in due to different control scheme and pinout. |
| TPS54160DGQR | 1.5A output, 100kHz–2.5MHz adjustable frequency, external MOSFETs, 116µA IQ, 3.5–60V input. | Used in higher-current or wider-input designs; demands more external components and compensation expertise. | Choose TPS54160DGQR for scalability beyond 100mA or when input exceeds 45V - requires redesign of power stage and loop compensation. |
Compared with LT3692EMSE-5#TRPBF and TPS54160DGQR, the LTC3631EMS8E-5#TRPBF delivers superior light-load efficiency and smallest solution size for 100mA 5V applications, trading off frequency control and current headroom for simplicity, ultra-low IQ, and inherent surge resilience.
Availability
LTC3631EMS8E-5#TRPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, 4–20mA current loop transmitters, and automotive body control modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3631EMS8E-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 automotive and industrial qualification standards.
The LTC3631EMS8E-5#TRPBF belongs to the LTC® high-voltage monolithic buck converter family, designed specifically for reliable, low-quiescent-current regulation in harsh environments including factory automation, remote monitoring, and vehicle subsystems.
FAQ
What is the guaranteed output voltage accuracy of the LTC3631EMS8E-5#TRPBF over temperature?
The LTC3631EMS8E-5#TRPBF guarantees 5V output with ±1.5% total error over the full –40°C to 125°C junction temperature range, combining initial tolerance, line regulation (0.001%/V), load regulation, and temperature drift - confirmed in Electrical Characteristics Table 1 of the official datasheet.
Can the LTC3631EMS8E-5#TRPBF operate with a 48V input transient?
Yes - the LTC3631EMS8E-5#TRPBF includes overvoltage lockout that disables switching above 50V (rising), allowing it to safely withstand 60V transients per Absolute Maximum Ratings. It resumes regulation automatically once VIN falls back within 4.5V–45V operating range.
Does the LTC3631EMS8E-5#TRPBF require external compensation components?
No - the LTC3631EMS8E-5#TRPBF uses a hysteretic Burst Mode® architecture with internal compensation, requiring only three external components (inductor, input cap, output cap) for fixed-output operation. No resistors or capacitors are needed for loop stability.
What is the thermal performance of the LTC3631EMS8E-5#TRPBF in the MS8E package?
The LTC3631EMS8E-5#TRPBF in MS8E package has θJA = 40°C/W on a standard 2-layer JEDEC board. With 100mA load at 12V input, power dissipation is ~120mW, resulting in ~4.8°C rise above ambient - well within safe margins at 125°C max junction temperature.
How does the ISET pin affect maximum output current in the LTC3631EMS8E-5#TRPBF?
The ISET pin sets peak inductor current from 50mA (shorted) to 225mA (open). Since average output current is limited to half the peak value, the LTC3631EMS8E-5#TRPBF delivers up to 100mA only when ISET is left floating (225mA peak), matching its rated specification.
LTC3631EMS8E-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3631EMS8E-5#TRPBF FAQ
1.How can I place an order for LTC3631EMS8E-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3631EMS8E-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 LTC3631EMS8E-5#TRPBF reliable?
The price and inventory of LTC3631EMS8E-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 LTC3631EMS8E-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3631EMS8E-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3631EMS8E-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3631EMS8E-5#TRPBF?
LTC3631EMS8E-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3631EMS8E-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 LTC3631EMS8E-5#TRPBF?
For technical support, including LTC3631EMS8E-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3631EMS8E-5#TRPBF requirements.
6.How does Aetrix verify that LTC3631EMS8E-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3631EMS8E-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 LTC3631EMS8E-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3631EMS8E-5#TRPBF?
All LTC3631EMS8E-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3631EMS8E-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 LTC3631EMS8E-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3631EMS8E-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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