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Analog Devices Inc. LTC3631IMS8E-5#TRPBF
- Part No.:
- LTC3631IMS8E-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3631IMS8E-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,650
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Product details
Overview
LTC3631IMS8E-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 LTC3631IMS8E-5#TRPBF datasheet, LTC3631IMS8E-5#TRPBF pinout, LTC3631IMS8E-5#TRPBF application, or LTC3631IMS8E-5#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed 5V fixed-output behavior, exact MS8E package mapping, and real-world selection guidance for high-input-voltage, low-quiescent-current buck conversion.
Technical Context
The LTC3631IMS8E-5#TRPBF implements a hysteretic Burst Mode® control architecture with an internal 0.800V ±1% feedback reference, enabling automatic transition between active switching bursts and deep-sleep cycles-drawing only 12µA during sleep-to maintain regulation across load currents from 100µA to 100mA. Its peak current limit is programmable via ISET (50mA–225mA), and its 100ns minimum high-side on-time ensures stable operation down to low duty cycles.
Input protection includes undervoltage lockout (UVLO rising threshold 4.15V typical) and overvoltage lockout (OVLO falling threshold 48V typical), allowing safe operation up to 60V transient surges. The RUN pin enables precise power sequencing with 1.21V rising threshold and 110mV hysteresis, while HYST provides open-drain logic-level feedback for external hysteresis adjustment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±1.5% (guaranteed over –40°C to 125°C junction) |
| Input Voltage Range | 4.5V to 45V continuous; survives 60V transients via integrated OVLO |
| No-Load Quiescent Current | 12µA typical-enables multi-year battery life in always-on sensor nodes |
| Max Output Current | 100mA continuous-supports industrial I/O modules and isolated sensor supplies |
| Feedback Reference | 0.800V ±1%-sets output accuracy and enables precision external resistor dividers for adjustable variants |
| Peak Current Limit | Programmable 50mA–225mA via ISET resistor-optimizes efficiency and component size for light-load operation |
| Soft-Start Time | 0.75ms internal default; externally adjustable via SS pin capacitor-prevents input droop during cold-start |
Pinout & Package
The LTC3631IMS8E-5#TRPBF is housed in an 8-lead plastic MSOP (MS8E) package with exposed pad (Pin 9), requiring soldering to PCB ground for thermal and electrical integrity. θJA = 40°C/W, θJC = 5–10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries full switching current and voltage swing (0V to VIN); requires low-inductance layout |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V; must be bypassed with ceramic capacitor directly to GND (Pin 8) |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets trip threshold (50–225mA); floating = 225mA |
| SS (Pin 4) | Soft-start ramp control | Sources 5µA; capacitor to GND extends start-up time beyond internal 0.75ms |
| RUN (Pin 5) | Enable/disable control | Active-high logic: >1.21V enables operation; <0.7V forces shutdown (3µA IQ) |
| VOUT/VFB (Pin 6) | Output feedback | Internally connected to 5V output; for fixed versions, ties directly to VOUT; senses 0.8V reference |
| HYST (Pin 7) | Run hysteresis indicator | Open-drain output pulled low when RUN <1.2V; used to add external hysteresis to RUN divider |
| GND (Pin 8) | Power and signal ground | Primary ground return; exposed pad (Pin 9) must be soldered to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains regulation at microamp loads while drawing only 12µA-critical for energy-harvesting and remote sensors |
| Integrated dual MOSFETs | Eliminates external high-side and synchronous rectifier-reduces BOM count and layout complexity |
| Wide 4.5V–45V input range | Directly regulates unregulated 12V, 24V, and 36V industrial rails and automotive batteries without pre-regulation |
| Precision RUN threshold | 1.21V enable with 110mV hysteresis ensures clean, bounce-free power sequencing in noisy environments |
| Overvoltage lockout to 60V | Protects against load-dump transients in automotive and industrial systems without external TVS |
Applications
| 4–20mA Current Loop Supply | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powers loop-powered transmitters in process automation where input is derived from 24V DC plant supply with potential surges. IC Role / Device Role / Timing Role: Primary 5V regulator supplying ADC, microcontroller, and analog front-end; handles 60V transients without external protection. Use Value: Enables single-chip solution with <12µA quiescent current-preserving loop compliance margin and extending field device battery life. | Use Scenario: Powers wireless temperature/humidity sensors deployed in factory-floor machinery with wide ambient temperature swings. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering regulated 5V from 12–36V industrial bus; operates continuously across –40°C to 125°C junction range. Use Value: Delivers 100mA at >85% efficiency from 24V input while maintaining sub-15µA sleep current-supporting multi-year operation on primary lithium cells. |
| Portable Instrument Front-End | Automotive Body Control Module (BCM) Sub-Regulator |
Use Scenario: Supplies precision analog circuitry (op-amps, references, SAR ADCs) in handheld test equipment powered by Li-ion packs (8–16.8V). IC Role / Device Role / Timing Role: Fixed 5V step-down regulator with low-noise Burst Mode® operation-minimizing switching interference in sensitive measurement paths. Use Value: Achieves <10mVpp output ripple at full load and maintains regulation during battery sag-ensuring measurement accuracy and stability. | Use Scenario: Generates 5V rail for microcontrollers and CAN transceivers in BCMs exposed to automotive load-dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Robust input-stage regulator with integrated 60V surge tolerance and precise UVLO/OVLO thresholds. Use Value: Eliminates need for external TVS diode and discrete enable circuit-reducing footprint and improving system-level reliability under harsh ESD/load-dump conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-input-voltage, low-quiescent-current buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIS8#TRPBF | 42V max input, 2A output, 2.5µA IQ, requires external compensation; no programmable peak current limit | Higher current, lower IQ-but larger solution size and more complex design for 100mA use case | Select if >100mA output or <2.5µA IQ is mandatory; avoid if minimal BOM and simple layout are priorities |
| TPS63036YFFR | 17V max input, 600mA output, 17µA IQ, buck-boost topology; no OVLO or UVLO thresholds specified | Supports input voltages below 4.5V; unsuitable for 24V/36V industrial rails or automotive load-dump scenarios | Select only for battery-powered systems with input <17V and bidirectional voltage regulation needs; not drop-in for LTC3631IMS8E-5#TRPBF |
Compared with LT8609SIS8#TRPBF and TPS63036YFFR, the LTC3631IMS8E-5#TRPBF offers optimal balance of ultra-low IQ (12µA), integrated protection (45V operation + 60V surge tolerance), fixed 5V simplicity, and minimal external components-making it uniquely suited for space-constrained, high-reliability 100mA industrial and automotive auxiliary rails.
Availability
LTC3631IMS8E-5#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, 4–20mA current loop interfaces, and portable instrumentation requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3631IMS8E-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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3631IMS8E-5#TRPBF belongs to Linear's high-voltage monolithic buck converter family, designed specifically for reliable, low-quiescent-power regulation in harsh industrial, automotive, and instrumentation environments where input voltage range, surge immunity, and long-term stability are critical.
FAQ
What is the guaranteed output voltage tolerance for LTC3631IMS8E-5#TRPBF over temperature?
The LTC3631IMS8E-5#TRPBF guarantees a 5V output with ±1.5% total error over the full –40°C to 125°C junction temperature range. This includes initial accuracy, line regulation (0.001%/V), load regulation, and temperature drift-all verified per the Electrical Characteristics table in the official datasheet. The internal 0.800V ±1% reference and precision trimming ensure this performance without external calibration.
Does LTC3631IMS8E-5#TRPBF require external compensation components?
No, the LTC3631IMS8E-5#TRPBF uses a hysteretic Burst Mode® control architecture that requires no external compensation components. Its internal loop is fully self-contained-eliminating the need for feedback capacitors or resistors beyond the basic input/output filtering. This simplifies design, reduces BOM count, and improves reliability compared to voltage-mode or current-mode controllers requiring loop compensation.
Can LTC3631IMS8E-5#TRPBF operate with input voltage below 4.5V?
No-the LTC3631IMS8E-5#TRPBF has a guaranteed operating input range of 4.5V to 45V. Below 4.5V, the undervoltage lockout (UVLO) disables switching; the rising UVLO threshold is 4.15V typical, with hysteresis ensuring clean re-enablement above 4.5V. Attempting operation below 4.5V will result in no regulated output, though the part remains undamaged per Absolute Maximum Ratings.
What is the role of the HYST pin on LTC3631IMS8E-5#TRPBF?
The HYST pin on LTC3631IMS8E-5#TRPBF is an open-drain logic output pulled low when the RUN pin voltage falls below 1.2V, indicating disabled operation. It is used to add external hysteresis to the RUN pin's enable threshold-typically by connecting HYST to the RUN divider network-allowing customizable startup/shutdown voltage windows without additional ICs.
Is the exposed pad (Pin 9) on LTC3631IMS8E-5#TRPBF electrically connected?
Yes-the exposed pad (Pin 9) on LTC3631IMS8E-5#TRPBF is internally connected to GND and must be soldered to the PCB ground plane. This connection is mandatory for both thermal performance (θJA = 40°C/W) and electrical integrity. Failure to solder the pad degrades thermal dissipation, increases junction temperature, and may cause premature failure or parametric shift under load.
LTC3631IMS8E-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
LTC3631IMS8E-5#TRPBF FAQ
1.How can I place an order for LTC3631IMS8E-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3631IMS8E-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 LTC3631IMS8E-5#TRPBF reliable?
The price and inventory of LTC3631IMS8E-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 LTC3631IMS8E-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3631IMS8E-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3631IMS8E-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3631IMS8E-5#TRPBF?
LTC3631IMS8E-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3631IMS8E-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 LTC3631IMS8E-5#TRPBF?
For technical support, including LTC3631IMS8E-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3631IMS8E-5#TRPBF requirements.
6.How does Aetrix verify that LTC3631IMS8E-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3631IMS8E-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 LTC3631IMS8E-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3631IMS8E-5#TRPBF?
All LTC3631IMS8E-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3631IMS8E-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 LTC3631IMS8E-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3631IMS8E-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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