My Inquiry
My Account
Analog Devices Inc. LTC3631IMS8E#TRPBF
- Part No.:
- LTC3631IMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3631IMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,273
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3631IMS8E#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 from a 4.5V–45V input. It operates in Burst Mode® with 12µA no-load quiescent current, features programmable peak current limit (50–225mA), and maintains regulation down to 0% duty cycle for low-dropout operation - ideal for industrial control supplies and battery-backed instrumentation.
For engineers reviewing the LTC3631IMS8E#TRPBF datasheet, LTC3631IMS8E#TRPBF pinout, LTC3631IMS8E#TRPBF application, or LTC3631IMS8E#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal performance in MS8E package, and real-world selection guidance against comparable high-voltage buck regulators.
Technical Context
The LTC3631IMS8E#TRPBF implements a hysteretic Burst Mode® control architecture with internal 0.8V ±1% feedback reference and dual comparators (feedback + peak current). Its switching frequency varies dynamically with input voltage, output voltage, and inductor value - no external compensation required. The device integrates P-channel high-side and N-channel low-side MOSFETs with typical on-resistances of 3.0Ω and 1.5Ω respectively.
Start-up is managed via a precise RUN pin threshold (1.21V rising, 1.10V falling) with 110mV hysteresis, augmented by HYST pin for external hysteresis adjustment. Soft-start is implemented both internally (0.75ms default) and externally via SS pin (5µA current source), while ISET pin enables resistor-programmable peak current limiting from 50mA to 225mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial, automotive, and battery-derived supplies; includes 60V surge tolerance via overvoltage lockout. |
| Output Current | 100mA maximum - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained systems. |
| Quiescent Current | 12µA typical in active regulation - enables multi-year battery life in always-on remote sensors and loop-powered devices. |
| Feedback Reference | 0.800V ±1% - enables accurate output regulation across temperature; used with external resistive divider for adjustable versions. |
| Peak Current Limit | Programmable 50mA–225mA via ISET resistor - allows optimization of inductor size, ripple, and efficiency for specific load profiles. |
| Package Thermal Resistance | θJA = 40°C/W (MS8E) - requires minimal PCB copper area for thermal management in industrial ambient conditions. |
| Operating Temperature | –40°C to +125°C junction - qualified for extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8E), 3mm × 3mm × 1.1mm profile with exposed thermal pad (Pin 9, GND). Requires soldering of exposed pad to PCB ground plane for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point between internal high-side and low-side MOSFETs; ties directly to inductor; carries high di/dt switching waveform. |
| VIN (Pin 2) | Main power input | Accepts 4.5V–45V supply; bypass capacitor required to GND for stability and EMI suppression. |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets peak inductor current from 50mA (shorted) to 225mA (open). |
| SS (Pin 4) | Soft-start control | Sources 5µA; external capacitor to GND controls output voltage ramp time and reduces input supply droop. |
| RUN (Pin 5) | Enable/disable control | Active-high logic input; >1.21V enables operation, <0.7V forces shutdown (3µA IQ); hysteresis configurable via HYST. |
| VOUT/VFB (Pin 6) | Output feedback | Connects to regulated output (fixed version) or resistive divider (adjustable version); referenced to 0.8V internal comparator. |
| HYST (Pin 7) | Run hysteresis output | Open-drain logic output pulled low when RUN is inactive; used to add external hysteresis to RUN threshold. |
| GND (Pin 8) | Analog/digital ground | Primary ground return; must be connected to PCB ground plane alongside exposed pad (Pin 9). |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains regulation at light loads while drawing only 12µA, enabling ultra-low-power operation without external enable sequencing. |
| Integrated power switches | Eliminates need for external MOSFETs and gate drivers; reduces BOM count and layout complexity in compact designs. |
| No compensation required | Hysteretic control architecture removes need for external compensation network - simplifies design and improves robustness across component tolerances. |
| Low dropout capability | 100% duty cycle operation allows VOUT to approach VIN - critical for brownout recovery and high-efficiency operation near input minimum. |
| Overvoltage lockout (OVLO) | Disables switching above 47–52V and sustains 60V surges - protects downstream circuitry in unregulated or transient-prone power rails. |
Applications
| Industrial Control Supplies | 4–20mA Current Loops |
|---|---|
|
Use Scenario: Powering analog sensor transmitters and PLC I/O modules in factory automation systems with 24V DC distribution rails. IC Role / Device Role / Timing Role: Primary 5V or 3.3V local regulator converting noisy 24V rail to clean, stable supply for precision ADCs and op-amps. Use Value: 12µA quiescent current minimizes self-heating in sealed enclosures; 45V max input accommodates line transients per IEC 61000-4-4. |
Use Scenario: Providing isolated, regulated bias for 4–20mA loop-powered field instruments operating from 12–42V loop supply. IC Role / Device Role / Timing Role: High-efficiency buck converter supplying 3.3V or 5V to microcontroller and signal conditioning circuitry within loop-powered devices. Use Value: Programmable peak current (50–225mA) allows matching inductor size to loop compliance voltage constraints; Burst Mode extends battery backup runtime. |
| Distributed Power Systems | Battery-Operated Devices |
|
Use Scenario: Local point-of-load regulation in telecom or datacom equipment where intermediate 12V or 24V rails feed multiple subsystems. IC Role / Device Role / Timing Role: Secondary regulator generating low-noise 3.3V for FPGA configuration, memory, or PHY interfaces from higher intermediate bus. Use Value: Wide 4.5–45V input range accepts multiple standard intermediate voltages; MS8E package enables dense board layouts with minimal thermal footprint. |
Use Scenario: Power management in portable test equipment, handheld meters, or wireless sensor nodes powered by Li-ion or primary batteries. IC Role / Device Role / Timing Role: Main system regulator stepping down battery voltage (e.g., 9–36V from series cells) to 3.3V/5V for MCU and peripherals. Use Value: 12µA no-load IQ extends shelf life and operational runtime; low dropout mode preserves functionality during battery depletion. |
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 | Higher 42V max input, 2A output, Silent Switcher® architecture; 2.5µA IQ but requires external compensation. | Better suited for higher-current, noise-sensitive applications (e.g., RF modules); larger solution size and cost. | Select when >100mA output or ultra-low EMI is required; not drop-in due to different pinout and control scheme. |
| TPS54240DGQR | 4.5–40V input, 2.5A output, current-mode control; 147µA IQ, requires external compensation and MOSFETs. | Offers higher current and adjustable frequency; less suitable for ultra-low-power or space-constrained designs. | Choose when design flexibility (frequency, external FETs) outweighs BOM simplicity and ultra-low IQ. |
Compared with LT8609SIS8E#TRPBF and TPS54240DGQR, the LTC3631IMS8E#TRPBF provides the lowest quiescent current (12µA), smallest solution size (3 external components for fixed output), and simplest implementation (no compensation), making it optimal for low-power, high-input-voltage, space-limited applications where 100mA suffices.
Availability
LTC3631IMS8E#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, 4–20mA current loops, distributed power systems, battery-operated devices, and automotive power systems requiring stable component supply across extended temperature ranges.
Supply support for LTC3631IMS8E#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 legacy of high-performance power management ICs with rigorous qualification and long-term product support.
The LTC3631IMS8E#TRPBF belongs to Linear's high-voltage monolithic buck converter family, designed specifically for reliable, low-quiescent-current regulation in harsh industrial and instrumentation environments where input transients and wide voltage ranges are common.
FAQ
What is the maximum input voltage the LTC3631IMS8E#TRPBF can withstand without damage?
The LTC3631IMS8E#TRPBF has an absolute maximum VIN rating of 60V and incorporates overvoltage lockout (OVLO) that disables switching above ~47–52V. While it safely sustains 60V transients, continuous operation above 45V violates the specified operating range and may impact reliability or regulation accuracy. Always refer to the Absolute Maximum Ratings table and derate accordingly for long-term use.
Does the LTC3631IMS8E#TRPBF require external compensation components?
No, the LTC3631IMS8E#TRPBF uses a hysteretic Burst Mode® control architecture that eliminates the need for external compensation networks. This simplifies design, improves stability across component tolerances and temperature, and reduces bill-of-materials count - only three external components (inductor, input capacitor, output capacitor) are needed for fixed-output configurations.
How is the output voltage set for the LTC3631IMS8E#TRPBF?
The LTC3631IMS8E#TRPBF is offered in fixed-output versions (e.g., -3.3, -5) and adjustable versions. For fixed versions, VOUT/VFB (Pin 6) connects directly to the output. For adjustable versions, an external resistive divider scales the output voltage to match the internal 0.800V ±1% feedback reference - enabling outputs from ~0.8V up to the input voltage minus dropout.
Can the LTC3631IMS8E#TRPBF operate with 100% duty cycle?
Yes, the LTC3631IMS8E#TRPBF supports 100% duty cycle operation, allowing VOUT to approach VIN. This low-dropout capability ensures continued regulation during brownout conditions or when input voltage falls near the desired output level - a key advantage in battery-powered or unregulated supply applications.
What is the role of the HYST pin on the LTC3631IMS8E#TRPBF?
The HYST pin (Pin 7) is an open-drain output that pulls low when the RUN pin voltage is below its 1.10V falling threshold. It enables external hysteresis enhancement for the RUN comparator - for example, by connecting HYST to RUN through a resistor - allowing precise control of enable/disable thresholds in systems monitoring VIN via a resistive divider.
LTC3631IMS8E#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 45V
- 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#TRPBF FAQ
1.How can I place an order for LTC3631IMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3631IMS8E#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#TRPBF reliable?
The price and inventory of LTC3631IMS8E#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3631IMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3631IMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3631IMS8E#TRPBF?
LTC3631IMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3631IMS8E#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#TRPBF?
For technical support, including LTC3631IMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3631IMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC3631IMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3631IMS8E#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3631IMS8E#TRPBF?
All LTC3631IMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3631IMS8E#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3631IMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3631IMS8E#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…
