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Analog Devices Inc. LTC3631IMS8E-5#PBF
- Part No.:
- LTC3631IMS8E-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3631IMS8E-5#PBF.pdf
- Description:
- IC REG BUCK 5V 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
LTC3631IMS8E-5#PBF 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 fixed 5V, operating from 4.5V to 45V input, featuring 12µA no-load quiescent current and Burst Mode® operation for ultra-low-power industrial sensing and 4–20mA loop supplies.
For engineers reviewing the LTC3631IMS8E-5#PBF datasheet, LTC3631IMS8E-5#PBF pinout, LTC3631IMS8E-5#PBF application, or LTC3631IMS8E-5#PBF equivalent, key selection criteria include its 5V fixed output, MS8E package thermal performance (θJA = 40°C/W), programmable peak current limit (50–225mA), internal soft-start, and overvoltage lockout protection up to 60V.
Technical Context
The LTC3631IMS8E-5#PBF implements a hysteretic Burst Mode® control architecture with an internal 0.800V ±1% feedback reference and 5mV comparator hysteresis, enabling high efficiency across 0.1–100mA load range. Its peak current limit is set via external resistor on ISET pin, and switching frequency varies dynamically with VIN, VOUT, and inductor value-no external compensation required.
Start-up is controlled by a precise RUN pin threshold (1.21V rising, 1.10V falling, 110mV hysteresis), with HYST pin providing open-drain logic output for external hysteresis adjustment. The device integrates reverse-current detection, undervoltage lockout (UVLO: 4.15V rising), and overvoltage lockout (OVLO: 47V rising), ensuring robust operation in automotive and industrial transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial and automotive inputs; withstands 60V surge via OVLO |
| Output Voltage | Fixed 5.0V ±1.5% - guaranteed over –40°C to 125°C junction temperature |
| Max Output Current | 100mA - average output limited to half of programmed peak inductor current |
| Quiescent Current | 12µA typical in active mode - enables multi-year battery life in always-on sensor nodes |
| Feedback Reference | 0.800V ±1% - precision reference enables accurate output regulation without external divider |
| Peak Current Limit | Programmable 50–225mA via ISET resistor - allows optimization of inductor size and efficiency at light loads |
| Soft-Start Time | Internal 0.75ms or external adjustable - prevents input droop during power-up in sensitive systems |
Pinout & Package
The LTC3631IMS8E-5#PBF 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 high di/dt switching waveform - requires tight layout and Kelvin connection |
| VIN (Pin 2) | Main supply input | Accepts 4.5–45V; bypassed with ceramic capacitor to GND for low-impedance path during switching |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets trip threshold (50–225mA); floating = max, shorted = min |
| SS (Pin 4) | Soft-start control | Sources 5µA; capacitor to GND sets ramp time - overrides internal 0.75ms if slower |
| RUN (Pin 5) | Enable/disable control | Active-high logic: >1.21V enables, <1.10V disables; 110mV hysteresis prevents chatter |
| VOUT/VFB (Pin 6) | Output feedback | Direct connection to 5V output; internal 0.800V reference eliminates need for external divider |
| HYST (Pin 7) | Run hysteresis output | Open-drain logic low when RUN < 1.2V - used to bias external resistor network for custom hysteresis |
| GND (Pin 8 + Exposed Pad 9) | Power and signal ground | Exposure pad must be soldered to PCB ground plane - critical for thermal dissipation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains 12µA no-load IQ while regulating output - essential for battery-powered remote sensors |
| Integrated power switches | Internal P-channel high-side and N-channel low-side MOSFETs - eliminates external FETs and gate drivers |
| No compensation required | Hysteretic control architecture - removes need for external compensation network and simplifies layout |
| Overvoltage lockout (OVLO) | Shuts down switching above 47V (min), protecting against 60V surges - critical for automotive load-dump survival |
| Precision RUN threshold | 1.21V rising / 1.10V falling with 110mV hysteresis - ensures clean, chatter-free enable/disable in noisy environments |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Power Supply |
|---|---|
Use Scenario: Powering analog sensor front-ends and DACs in field-mounted 4–20mA loop-powered transmitters. IC Role / Device Role / Timing Role: Primary 5V regulator supplying signal conditioning circuitry and current-output stage. Use Value: Ultra-low 12µA quiescent current preserves loop compliance voltage margin; wide 4.5–45V input accommodates varying loop supply conditions. | Use Scenario: Providing stable 5V rail for MEMS accelerometers, temperature sensors, and wireless SoCs in harsh industrial environments. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with transient protection for mission-critical monitoring nodes. Use Value: 60V surge tolerance and –40°C to 125°C operation ensure uninterrupted function during voltage spikes and extreme ambient temperatures. |
| Portable Instrumentation | Automotive Body Control Module |
Use Scenario: Powering handheld test equipment with Li-ion or alkaline battery sources. IC Role / Device Role / Timing Role: Efficient step-down converter enabling long runtime from single-cell or multi-cell battery packs. Use Value: 100% duty-cycle capability supports dropout operation down to 4.5V input - extends usable battery life near end-of-discharge. | Use Scenario: Regulating 5V for microcontrollers, CAN transceivers, and LED drivers in non-safety-critical automotive subsystems. IC Role / Device Role / Timing Role: Input-protected DC/DC converter meeting ISO 7637-2 pulse requirements for 12V vehicle systems. Use Value: Integrated UVLO/OVLO and 60V absolute max rating eliminate need for external TVS or discrete protection components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EDD-5#PBF | Same IC die, but in 3mm × 3mm DFN package (θJA = 43°C/W vs MS8E's 40°C/W); exposed pad also GND | Higher power density; better thermal performance on small PCB areas; less compatible with legacy MSOP footprints | Select LTC3631EDD-5#PBF when board space is constrained and thermal management relies on bottom-side copper, not edge-mount heatsinking |
| LTC3631IMS8E#PBF | Adjustable-output version (VOUT set by external resistor divider); identical pinout, package, and thermal specs | Requires two external resistors; supports custom output voltages (e.g., 3.3V, 2.5V) but adds BOM cost and layout complexity | Select LTC3631IMS8E#PBF only when non-standard output voltage is required - fixed 5V version avoids divider errors and improves accuracy |
Compared with LTC3631EDD-5#PBF, the LTC3631IMS8E-5#PBF offers slightly better thermal resistance in edge-mounted layouts, while compared with LTC3631IMS8E#PBF, it eliminates feedback divider uncertainty and improves output voltage accuracy by 0.3% over temperature.
Availability
LTC3631IMS8E-5#PBF is available at Aetrix Electronics and suitable for industrial sensor power supplies, 4–20mA loop transmitters, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3631IMS8E-5#PBF 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#PBF belongs to Linear's high-voltage monolithic DC/DC converter family, designed specifically for rugged industrial and automotive power conversion where input transients, wide VIN range, and ultra-low quiescent current are mandatory.
FAQ
What is the guaranteed output voltage accuracy of the LTC3631IMS8E-5#PBF over temperature?
The LTC3631IMS8E-5#PBF delivers 5.0V output with ±1.5% total error over the full –40°C to 125°C junction temperature range. This includes initial tolerance, line regulation (0.001%/V), load regulation, and temperature drift of the internal 0.800V ±1% feedback reference - verified per Electrical Characteristics table on page 3 of the datasheet.
Can the LTC3631IMS8E-5#PBF operate with input voltage below 4.5V?
No - the LTC3631IMS8E-5#PBF has a hard undervoltage lockout (UVLO) that disables switching when VIN falls below 4.35V (max). Below this threshold, the device enters shutdown mode drawing only 3µA. It will not regulate or deliver output current until VIN rises above 4.5V, the specified minimum operating voltage for LTC3631IMS8E-5#PBF.
How does the ISET pin affect peak current and efficiency in the LTC3631IMS8E-5#PBF?
The ISET pin on the LTC3631IMS8E-5#PBF sources a precise 1µA current; connecting a resistor to GND sets the peak inductor current between 50mA and 225mA. Lower peak current reduces switching losses and enables smaller magnetics, improving light-load efficiency - but average output is capped at half the peak value, so 100mA load requires ≥200mA peak setting, which the LTC3631IMS8E-5#PBF supports only when ISET is left floating.
Is the exposed pad (Pin 9) of the LTC3631IMS8E-5#PBF electrically connected to GND?
Yes - the exposed pad (Pin 9) of the LTC3631IMS8E-5#PBF is internally bonded to GND and must be soldered to the PCB ground plane. Per the Absolute Maximum Ratings table and Pin Configuration diagram, failure to connect this pad degrades thermal performance (θJA increases significantly) and may cause instability or premature failure under sustained load.
Does the LTC3631IMS8E-5#PBF require external compensation components?
No - the LTC3631IMS8E-5#PBF uses a hysteretic Burst Mode® control architecture with internal feedback comparator and no external compensation required. Its stability is inherent to the design; only three external components (inductor, input capacitor, output capacitor) are needed for basic operation of the fixed 5V version, as confirmed in the Features list and Typical Application schematic.
LTC3631IMS8E-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3631IMS8E-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3631IMS8E-5#PBF 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#PBF reliable?
The price and inventory of LTC3631IMS8E-5#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3631IMS8E-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3631IMS8E-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3631IMS8E-5#PBF?
LTC3631IMS8E-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3631IMS8E-5#PBF 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#PBF?
For technical support, including LTC3631IMS8E-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3631IMS8E-5#PBF requirements.
6.How does Aetrix verify that LTC3631IMS8E-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3631IMS8E-5#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3631IMS8E-5#PBF?
All LTC3631IMS8E-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3631IMS8E-5#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3631IMS8E-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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