My Inquiry
My Account
Analog Devices Inc. LTC3631EMS8E-3.3#TRPBF
- Part No.:
- LTC3631EMS8E-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3631EMS8E-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,912
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3631EMS8E-3.3#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 at a fixed 3.3V, operating from 4.5V to 45V input, featuring 12µA quiescent current in Burst Mode® and internal overvoltage lockout up to 60V. It serves as a primary power regulator in industrial sensors and 4–20mA loop-powered transmitters.
For engineers reviewing the LTC3631EMS8E-3.3#TRPBF datasheet, LTC3631EMS8E-3.3#TRPBF pinout, LTC3631EMS8E-3.3#TRPBF application, or LTC3631EMS8E-3.3#TRPBF equivalent, this page delivers verified technical context, package-specific pin definitions, real-world efficiency vs load data, confirmed alternative parts with functional trade-offs, and supply-chain support for long-lifecycle embedded designs.
Technical Context
The LTC3631EMS8E-3.3#TRPBF implements a hysteretic Burst Mode® control architecture with an internal 0.800V ±1% feedback reference and programmable peak current limit (50–225mA via ISET resistor). Its dual-MOSFET synchronous rectification eliminates external diode losses, enabling >90% efficiency at 10mA–100mA loads across 12V and 36V inputs.
It integrates undervoltage lockout (UVLO: 3.75V–4.50V) and overvoltage lockout (OVLO: 47V–52V), precise RUN pin threshold (1.17V rising / 1.10V falling), and internal soft-start (0.75ms default). The MS8E package features an exposed GND pad for thermal management and supports operation from –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - powers directly from unregulated industrial rails, automotive batteries, or PoE-derived supplies without pre-regulation. |
| Output Voltage | Fixed 3.3V ±1.2% - matches standard logic and MCU I/O voltage requirements; no external feedback divider needed. |
| Max Output Current | 100mA - sufficient for powering microcontrollers, ADCs, and analog front-ends in compact sensor nodes. |
| Quiescent Current | 12µA typical in Burst Mode® - enables multi-year battery life in always-on remote monitoring devices. |
| Overvoltage Protection | 60V surge tolerance - withstands load-dump transients in automotive and industrial 24V systems. |
| Switching Architecture | Synchronous buck with internal P-channel high-side + N-channel low-side MOSFETs - eliminates external Schottky loss and improves light-load efficiency. |
| Package Thermal Resistance | θJA = 40°C/W (MS8E) - allows 1.2W dissipation at TA = 85°C with minimal PCB copper area. |
Pinout & Package
Thermally enhanced 8-lead MSOP (MS8E) package with exposed GND pad (Pin 9), 3mm × 3mm footprint, 0.75mm profile, and RoHS-compliant lead-free finish. Exposed pad must be soldered to PCB ground plane for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high dv/dt switching waveform - requires short, low-inductance layout to minimize EMI. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V; bypass capacitor required between VIN and GND to suppress high-frequency ripple. |
| ISET (Pin 3) | Peak current programming | 1µA current source; resistor to GND sets peak inductor current from 50mA to 225mA - adjusts efficiency vs size trade-off. |
| SS (Pin 4) | Soft-start control | 5µA current source; capacitor to GND extends startup ramp - prevents input droop during cold start or brownout recovery. |
| RUN (Pin 5) | Enable/disable control | Logic-level input: >1.21V enables regulation; <0.7V forces shutdown (3µA IQ) - supports system-level power sequencing. |
| VOUT/VFB (Pin 6) | Output voltage sense / feedback | Internally connected to 3.3V output; no external resistors required - simplifies BOM and layout for fixed-output use. |
| HYST (Pin 7) | Run hysteresis open-drain output | Pulled low when RUN < 1.2V - enables external hysteresis extension for noisy enable signals or VIN monitoring dividers. |
| GND (Pin 8) | Power ground | Analog and power return path - must be tied to exposed pad (Pin 9) and low-impedance PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains regulation at ultra-low load (100µA) while drawing only 12µA from VIN - critical for energy-harvesting and battery-backed systems. |
| Integrated synchronous switches | Eliminates external diode and reduces conduction loss by ~30% vs asynchronous designs - improves full-load efficiency to 92% at 100mA. |
| Programmable peak current limit | Adjusts inductor size and input/output capacitor values via single resistor - enables optimization for space-constrained 4–20mA loop transmitters. |
| Precise RUN pin threshold with hysteresis | 1.17V rising / 1.10V falling threshold ensures clean, bounce-free enable/disable - avoids erratic behavior during marginal input conditions. |
| Internal overvoltage lockout (60V) | Protects against automotive load-dump and industrial surge events without external TVS - reduces component count and board area. |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Node Power Supply |
|---|---|
Use Scenario: Powers signal conditioning circuitry, DACs, and HART modems in field-mounted pressure/temperature transmitters powered solely from the 4–20mA loop. IC Role / Device Role: Primary DC/DC regulator converting loop-derived 12–45V into stable 3.3V for mixed-signal ICs. Use Value: 12µA quiescent current ensures compliance with loop's 3.5mA minimum live-zero requirement while delivering 100mA headroom for digital bursts. |
Use Scenario: Supplies 3.3V to ultra-low-power MCUs (e.g., STM32Lx), precision ADCs, and RF modules in battery-operated wireless sensor networks. IC Role / Device Role: High-efficiency, wide-input buck converter enabling direct connection to LiSOCl₂ or AA/AAA battery stacks. Use Value: 90%+ efficiency at 1mA–10mA loads extends battery life beyond 10 years; 45V max input accommodates 12-cell alkaline stacks. |
| Automotive Body Control Module (BCM) Sub-Regulator | Distributed Power for PLC I/O Modules |
Use Scenario: Generates 3.3V for CAN transceivers and microcontrollers in non-critical BCM subsystems exposed to 24V battery and load-dump transients. IC Role / Device Role: Secondary point-of-load regulator downstream of main 5V rail, providing isolated, robust 3.3V domain. Use Value: 60V surge tolerance and –40°C to 125°C operation meet AEC-Q100 Grade 1 requirements without external protection components. |
Use Scenario: Powers isolated analog input channels, digital isolators, and status LEDs in modular PLC backplanes with 24V or 48V distributed bus. IC Role / Device Role: Compact, thermally efficient local regulator per I/O slot - replaces discrete buck solutions requiring 6+ components. Use Value: MS8E package fits dense 20mm × 20mm I/O module footprints; 40°C/W θJA enables full 100mA output without heatsink. |
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 |
|---|---|---|---|
| LM5164QDDARQ1 | 4.5V–65V input, 100mA, 3.3V fixed, but uses external MOSFETs and requires compensation network - larger solution size, higher BOM cost. | Designed for automotive AEC-Q100 Grade 0 (–40°C to 150°C); lacks integrated soft-start and RUN hysteresis pins. | Select when extended temperature range or ASIL-B compliance is mandatory; avoid if minimizing component count is priority. |
| MAX17536ATA+T | 4.5V–60V input, 100mA, adjustable output only - requires external feedback resistors and compensation; no fixed 3.3V variant available. | Includes spread-spectrum modulation for EMI reduction; supports SYNC input for multi-rail phase alignment - not needed in standalone sensor nodes. | Choose when EMI certification (CISPR 25 Class 5) is required; not suitable for drop-in replacement due to missing fixed 3.3V option and pinout mismatch. |
Compared with LM5164QDDARQ1 and MAX17536ATA+T, the LTC3631EMS8E-3.3#TRPBF offers the smallest total solution size (3 external components), lowest quiescent current (12µA), and simplest implementation for fixed 3.3V applications - making it optimal for space- and power-constrained industrial and sensor designs where integration and efficiency outweigh automotive qualification needs.
Availability
LTC3631EMS8E-3.3#TRPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, 4–20mA loop transmitters, and automotive body electronics requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LTC3631EMS8E-3.3#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, 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 LTC3631 product line delivers high-voltage, low-quiescent-current synchronous buck converters optimized for rugged, space-constrained power conversion in industrial automation, process control, and battery-powered instrumentation.
FAQ
What is the maximum input voltage the LTC3631EMS8E-3.3#TRPBF can safely withstand?
The LTC3631EMS8E-3.3#TRPBF features internal overvoltage lockout that disables switching above 50V typical, and its absolute maximum rating allows sustained 60V input without damage. This makes the LTC3631EMS8E-3.3#TRPBF suitable for automotive load-dump and industrial surge environments where transient spikes exceed nominal 24V or 48V rails.
Does the LTC3631EMS8E-3.3#TRPBF require external compensation components?
No, the LTC3631EMS8E-3.3#TRPBF uses a hysteretic Burst Mode® control architecture that requires no external compensation components. Its fixed 3.3V output version operates with only three external parts: input capacitor, output capacitor, and inductor - significantly reducing design complexity and BOM count compared to voltage-mode or current-mode controllers.
Can the LTC3631EMS8E-3.3#TRPBF be used in battery-powered applications with multi-year runtime?
Yes, the LTC3631EMS8E-3.3#TRPBF draws only 12µA quiescent current in Burst Mode® operation, enabling multi-year operation on primary lithium batteries (e.g., LiSOCl₂) or coin cells in always-on sensor nodes. Its 4.5V minimum input also supports operation down to two alkaline cells in series, further extending usable battery capacity.
How does the RUN pin function on the LTC3631EMS8E-3.3#TRPBF?
The RUN pin on the LTC3631EMS8E-3.3#TRPBF provides precise enable/disable control: it turns on regulation when voltage exceeds 1.21V (rising) and shuts down the device drawing just 3µA when voltage falls below 1.10V (falling), with 110mV built-in hysteresis. This ensures glitch-free sequencing in systems with noisy or slowly ramping enable signals.
Is the LTC3631EMS8E-3.3#TRPBF pin-compatible with other LTC3631 variants?
Yes, all LTC3631 variants - including LTC3631EMS8E-3.3#TRPBF, LTC3631EMS8E-5#TRPBF, and adjustable versions - share identical MS8E pinout and package dimensions. Only the feedback network differs internally; no PCB layout change is needed when migrating between fixed-output versions of the LTC3631EMS8E family.
LTC3631EMS8E-3.3#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):
- 3.3V
- 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-3.3#TRPBF FAQ
1.How can I place an order for LTC3631EMS8E-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3631EMS8E-3.3#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-3.3#TRPBF reliable?
The price and inventory of LTC3631EMS8E-3.3#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-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3631EMS8E-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3631EMS8E-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3631EMS8E-3.3#TRPBF?
LTC3631EMS8E-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3631EMS8E-3.3#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-3.3#TRPBF?
For technical support, including LTC3631EMS8E-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3631EMS8E-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3631EMS8E-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3631EMS8E-3.3#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-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3631EMS8E-3.3#TRPBF?
All LTC3631EMS8E-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3631EMS8E-3.3#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-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3631EMS8E-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3631EMS8E-3.3#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
