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Analog Devices Inc. LTC3631EMS8E#TRPBF
- Part No.:
- LTC3631EMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3631EMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,722
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Product details
Overview
LTC3631EMS8E#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, 4.5V–45V input range, 100mA output capability, and 12µA no-load quiescent current-designed for industrial control supplies and battery-operated devices requiring robust input surge tolerance up to 60V.
For engineers reviewing the LTC3631EMS8E#TRPBF datasheet, LTC3631EMS8E#TRPBF pinout, LTC3631EMS8E#TRPBF application, or LTC3631EMS8E#TRPBF equivalent, key selection considerations include programmable peak current limit (50–225mA), 0.8V ±1% feedback reference, Burst Mode® operation for light-load efficiency, internal soft-start, and precise RUN pin threshold with adjustable hysteresis.
Technical Context
The LTC3631EMS8E#TRPBF implements a hysteretic current-mode control architecture with Burst Mode® operation: it alternates between short burst cycles (enabling both P-channel high-side and N-channel low-side switches) and sleep cycles (disabling all power switches while sustaining output via capacitor discharge), achieving 12µA quiescent current at no load. The feedback comparator compares VFB against a trimmed 0.800V reference with 5mV hysteresis, triggering bursts when VFB falls below 0.795V.
Input protection includes undervoltage lockout (UVLO rising threshold 4.15V, hysteresis 150mV) and overvoltage lockout (OVLO rising threshold 47V, hysteresis 2V), enabling safe operation across 4.5V–45V while surviving 60V transients. Peak inductor current is set via ISET pin (1µA sourced), allowing resistor-programmed limits from 50mA to 225mA-directly determining maximum average output current (≤½ × IPEAK).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide-range industrial and automotive inputs; survives 60V surges without damage. |
| Output Current | 100mA max - sufficient for powering microcontrollers, sensors, and interface ICs in distributed systems. |
| Quiescent Current | 12µA typical at no load - enables multi-year battery life in always-on portable instrumentation. |
| Feedback Reference | 0.800V ±1% - enables precise output regulation; fixed 3.3V/5V versions use internal divider; adjustable version requires external resistive divider. |
| Peak Current Limit | Programmable 50mA–225mA via ISET resistor - allows optimization of inductor size, ripple, and efficiency for specific load profiles. |
| Soft-Start | Internal 0.75ms or external capacitor-controlled - prevents input supply droop during power-up; ramp rate set by 5µA current into SS pin. |
| RUN Pin Threshold | 1.21V rising / 1.10V falling - provides clean enable/disable control with 110mV hysteresis; HYST pin offers open-drain logic output for external hysteresis extension. |
Pinout & Package
The LTC3631EMS8E#TRPBF is housed in an 8-lead thermally enhanced MSOP package (MS8E) with exposed pad (Pin 9) soldered to PCB ground for optimal thermal performance (θJA = 40°C/W). Pin 1 is SW (switch node), Pin 2 is VIN, Pin 3 is ISET, Pin 4 is SS, Pin 5 is RUN, Pin 6 is VOUT/VFB, Pin 7 is HYST, and Pins 8 & 9 are GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node connection | Drain connection of internal high-side and low-side MOSFETs; ties to inductor; carries high di/dt switching current. |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V input; bypassed with ceramic capacitor to GND; feeds internal regulators and power switches. |
| 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 sets output voltage ramp time; default internal ramp is 0.75ms. |
| RUN (Pin 5) | Enable/disable control | Logic input: >1.21V enables operation; <0.7V forces shutdown (3µA IQ); hysteresis ensures noise immunity. |
| VOUT/VFB (Pin 6) | Output feedback | Connects to output for fixed versions; for adjustable versions, connects to resistive divider to scale output to 0.8V reference. |
| HYST (Pin 7) | Run hysteresis logic output | Open-drain output pulled low when RUN < 1.2V; used to extend RUN pin hysteresis with external resistor to VIN. |
| GND (Pins 8 & 9) | Ground reference | Pin 8 is signal GND; Pin 9 is exposed thermal pad - must be soldered to PCB ground plane for electrical integrity and thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Enables 12µA no-load IQ by alternating active burst cycles with zero-power sleep intervals-critical for battery longevity. |
| Integrated power switches | Eliminates need for external MOSFETs and gate drivers; reduces BOM count and layout complexity in space-constrained designs. |
| No compensation required | Internal control loop is inherently stable across full load and input ranges-no external compensation network needed. |
| Low dropout operation | Supports 100% duty cycle-enables regulation down to VIN – VDROP, useful for near-battery-input applications. |
| Overvoltage lockout to 60V | Protects device during load dump or transient events common in automotive and industrial 24V/48V systems. |
Applications
| 4–20mA Current Loop Transmitter | Industrial Sensor Node Power |
|---|---|
Use Scenario: Powering a 4–20mA transmitter circuit from a 24V loop supply with strict low-power requirements and EMI constraints. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 5V or 3.3V to op-amps, ADCs, and current-sense circuitry. Use Value: 12µA quiescent current minimizes loop error; wide input range accommodates varying loop voltage drops; Burst Mode® eliminates switching noise that could corrupt analog signals. | Use Scenario: Supplying remote wireless sensor nodes powered by primary lithium batteries or energy harvesters. IC Role / Device Role / Timing Role: Main system regulator converting harvested or battery voltage to clean 3.3V for MCU, RF transceiver, and analog front-end. Use Value: Ultra-low IQ extends multi-year battery life; programmable peak current allows matching inductor size to available board area; 60V surge tolerance protects against ESD and lightning-induced transients. |
| Automotive Body Control Module | Portable Test Instrumentation |
Use Scenario: Regulating 12V or 24V vehicle battery to 5V for microcontroller-based lighting or door module logic. IC Role / Device Role / Timing Role: High-reliability DC/DC converter handling cold-crank (4.5V) and load-dump (60V) conditions per ISO 7637-2. Use Value: Integrated UVLO/OVLO eliminates need for external protection ICs; MS8E package withstands automotive thermal cycling; -40°C to 125°C rating meets AEC-Q200 stress requirements. | Use Scenario: Powering handheld multimeters, oscilloscope probes, or portable spectrum analyzers operating from rechargeable Li-ion packs. IC Role / Device Role / Timing Role: Efficient, low-noise power stage delivering regulated 3.3V/5V to precision analog circuits and display controllers. Use Value: Low output ripple (<10mV p-p typical) avoids measurement interference; compact 3mm×3mm DFN or MS8E footprint saves PCB space; soft-start prevents inrush-induced display flicker. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609SIS8E#TRPBF | Higher 2A output, 2.8V–42V input, 2.5µA IQ, Silent Switcher® architecture; requires external compensation. | Targets higher-current applications (e.g., motor drivers, FPGA cores); superior EMI performance but larger solution size. | Select LT8609S when >100mA output or ultra-low EMI is mandatory; LTC3631EMS8E#TRPBF remains optimal for cost-sensitive, low-IQ, low-component-count designs. |
| TPS54202DDCR | 2A output, 4.5V–28V input, 26µA IQ, integrated compensation; no OVLO beyond 28V abs max. | Designed for consumer-grade 12V/24V systems; lacks 60V surge tolerance and programmable peak current. | Choose TPS54202DDCR for high-volume, non-automotive applications where absolute maximum ratings are less critical and higher output current is needed. |
Compared with LT8609SIS8E#TRPBF and TPS54202DDCR, the LTC3631EMS8E#TRPBF delivers unique value in ultra-low-quiescent-current, wide-input, single-chip 100mA regulation with built-in 60V surge protection-making it irreplaceable in long-life industrial and automotive subsystems where component count, reliability, and standby power are paramount.
Availability
LTC3631EMS8E#TRPBF is available at Aetrix Electronics and suitable for industrial control supplies, 4–20mA current loops, and portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3631EMS8E#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3631 belongs to ADI's high-voltage monolithic DC/DC converter product line, engineered specifically for rugged industrial, automotive, and instrumentation applications demanding wide input range, low IQ, and integrated protection features.
FAQ
What is the maximum input voltage the LTC3631EMS8E#TRPBF can safely withstand?
The LTC3631EMS8E#TRPBF has an absolute maximum VIN rating of 60V and includes internal overvoltage lockout (OVLO) that disables switching above 47V (rising threshold). This allows the device to survive automotive load-dump transients and industrial surge events without damage while maintaining regulation from 4.5V to 45V.
Does the LTC3631EMS8E#TRPBF require external compensation components?
No, the LTC3631EMS8E#TRPBF uses an internally compensated hysteretic current-mode control architecture. No external compensation network is required-only three external components (inductor, input capacitor, output capacitor) are needed for fixed-output versions, simplifying design and reducing bill-of-materials cost.
How is the output voltage set for the LTC3631EMS8E#TRPBF?
The LTC3631EMS8E#TRPBF is available in fixed 3.3V and 5V versions (e.g., LTC3631EMS8E-3.3#TRPBF), where VOUT/VFB (Pin 6) connects directly to the output. For adjustable operation, an external resistive divider scales the output to match the internal 0.800V ±1% feedback reference-enabling custom output voltages from ~0.8V upward.
Can the LTC3631EMS8E#TRPBF operate in 100% duty cycle mode?
Yes, the LTC3631EMS8E#TRPBF supports 100% duty cycle operation, allowing it to maintain regulation even when VIN approaches VOUT. This feature is essential for battery-powered systems nearing end-of-discharge or for applications with minimal input-to-output differential, such as powering 3.3V circuitry from a 3.6V Li-ion cell.
What thermal considerations apply to the LTC3631EMS8E#TRPBF in the MS8E package?
The LTC3631EMS8E#TRPBF in the MS8E package has θJA = 40°C/W and requires the exposed pad (Pin 9) to be soldered to a PCB ground plane for effective heat dissipation. At 100mA load and 12V input, typical power dissipation is <150mW; proper copper pour under the pad ensures junction temperature remains within the –40°C to 125°C operating range.
LTC3631EMS8E#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
LTC3631EMS8E#TRPBF FAQ
1.How can I place an order for LTC3631EMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3631EMS8E#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#TRPBF reliable?
The price and inventory of LTC3631EMS8E#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3631EMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3631EMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3631EMS8E#TRPBF?
LTC3631EMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3631EMS8E#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#TRPBF?
For technical support, including LTC3631EMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3631EMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC3631EMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3631EMS8E#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3631EMS8E#TRPBF?
All LTC3631EMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3631EMS8E#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3631EMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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