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Analog Devices Inc. LTC3631EDD-5#PBF
- Part No.:
- LTC3631EDD-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3631EDD-5#PBF.pdf
- Description:
- IC REG BUCK 5V 100MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:718
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Product details
Overview
LTC3631EDD-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 regulation in battery- or industrial-supply systems.
For engineers reviewing the LTC3631EDD-5#PBF datasheet, LTC3631EDD-5#PBF pinout, LTC3631EDD-5#PBF application, or LTC3631EDD-5#PBF equivalent, this page delivers verified electrical parameters, thermal package data, confirmed pin functions, real-world efficiency curves, and validated alternative parts - all specific to the DFN-8 (3mm × 3mm) 5V fixed-output variant.
Technical Context
The LTC3631EDD-5#PBF implements a hysteretic burst-mode control architecture with an internal 0.800V ±1% feedback reference and 5mV comparator hysteresis, enabling automatic transition between active switching bursts and 12µA sleep mode. Its peak current limit is programmable via ISET (50–225mA), and it includes dedicated RUN and HYST pins for precise enable threshold (1.21V rising / 1.10V falling) and external hysteresis adjustment.
It integrates both P-channel high-side and N-channel low-side power switches (RON = 3.0Ω / 1.5Ω), supports 100% duty-cycle low-dropout operation, and features overvoltage lockout (47–52V trip) and undervoltage lockout (3.75–4.50V trip) - all within a thermally enhanced 8-lead DFN package with exposed GND pad soldered to PCB for θJA = 43°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide industrial, automotive, and battery-derived supplies; withstands 60V transients without damage. |
| Output Voltage | Fixed 5.00V ±1.5% - guaranteed over full –40°C to 125°C junction temperature range; no external feedback divider required. |
| Max Output Current | 100mA - average load capability; limited by internal peak current comparator set to 225mA (IPEAK = 2 × IOUT). |
| Quiescent Current | 12µA typical in regulation - enables multi-year battery life in always-on sensor or loop-powered devices. |
| Feedback Reference | 0.800V ±1% - precision internal reference used to regulate VOUT; enables accurate 5V output with minimal external component tolerance impact. |
| Overvoltage Lockout | 47V min / 52V max - protects internal switches during line surges; device remains functional up to absolute max 60V. |
| Package Thermal Resistance | θJA = 43°C/W - achieved via 3mm × 3mm DFN with soldered exposed pad; enables 100mA operation at TA ≤ 85°C without heatsink. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed GND pad (Pin 9), RoHS-compliant, moisture-sensitive level 1. Requires PCB land pattern per Linear/LT AN136 for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connection point for external inductor; ties to drains of internal high-side and low-side MOSFETs; carries high di/dt switching waveform. |
| VIN (Pin 2) | Main Input Supply | Primary power input (4.5–45V); requires local 2.2µF ceramic bypass capacitor to GND for EMI suppression and transient response. |
| ISET (Pin 3) | Peak Current Programming | Sources 1µA; resistor to GND sets peak inductor current from 50mA (shorted) to 225mA (open); determines max output current and component sizing. |
| SS (Pin 4) | Soft-Start Control | Sources 5µA; external capacitor to GND controls output voltage ramp time (default internal = 0.75ms); prevents input droop during startup. |
| RUN (Pin 5) | Enable Control Input | Logic-level enable: >1.21V enables regulation; <0.7V forces shutdown (3µA IQ); hysteresis ensures clean power sequencing. |
| VOUT/VFB (Pin 6) | Output Feedback | Direct connection to 5V output for fixed-version operation; internally compared to 0.800V reference to maintain regulation accuracy. |
| HYST (Pin 7) | Run Hysteresis Output | Open-drain logic output pulled low when RUN < 1.2V; used with external resistor divider to increase effective RUN hysteresis. |
| GND (Pins 8 & 9) | Ground Reference | Pins 8 (bond pad) and 9 (exposed thermal pad) are electrically connected; pad must be soldered to PCB ground plane for thermal and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Enables 12µA no-load IQ while maintaining tight 5V regulation - critical for energy-harvesting and long-life battery systems. |
| Integrated Power Switches | Eliminates need for external MOSFETs and gate drivers; reduces BOM count to only three components (inductor + 2 caps) for fixed 5V design. |
| Programmable Peak Current Limit | Adjusts max inductor current from 50mA to 225mA via single resistor - allows optimization of efficiency, size, and ripple for specific load profiles. |
| Precise RUN Threshold with Hysteresis | 1.21V enable / 1.10V disable threshold with 110mV hysteresis - ensures robust power-up/down sequencing in noisy industrial environments. |
| Overvoltage Protection to 60V | Internal OVLO circuit disables switching above 47–52V and sustains 60V indefinitely - protects against load dump or supply transients in automotive/industrial use. |
Applications
| 4–20mA Current Loop Power | Industrial Sensor Supply |
|---|---|
|
Use Scenario: Powers 4–20mA transmitter circuits from unregulated 12–36V loop supplies, where low quiescent current preserves loop compliance voltage. IC Role / Device Role / Timing Role: Primary 5V regulator supplying analog front-end, ADC, and current-sense amplifier; operates in Burst Mode to minimize idle current draw. Use Value: Enables >10-year battery life in wireless transmitters and maintains >3V headroom across full 4–20mA range at 24V loop supply. |
Use Scenario: Supplies isolated or non-isolated pressure, temperature, or flow sensors in harsh factory-floor environments with fluctuating 24V DC rails. IC Role / Device Role / Timing Role: High-reliability 5V local supply; uses OVLO and UVLO to survive brownouts and surges common in PLC-controlled machinery. Use Value: Delivers stable 5V ±1.5% over –40°C to 125°C ambient, eliminating need for external supervision or backup regulators. |
| Distributed Power System | Automotive Body Electronics |
|
Use Scenario: Provides point-of-load 5V for microcontrollers, CAN transceivers, and EEPROM in distributed bus architectures with 12–48V backbone. IC Role / Device Role / Timing Role: Secondary regulator downstream of primary DC/DC; handles dynamic load steps up to 100mA with <50mV transient deviation. Use Value: Achieves >85% efficiency at 10mA–100mA loads and withstands 60V load-dump events without latch-off or reset. |
Use Scenario: Powers infotainment peripherals, door modules, or lighting controllers from vehicle battery (9–16V nominal, up to 45V during cranking or alternator surge). IC Role / Device Role / Timing Role: Robust 5V supply with integrated protection; RUN pin enables controlled wake-up from sleep mode during CAN bus activity. Use Value: Meets AEC-Q200 stress requirements via thermal DFN package and 125°C junction rating; eliminates external TVS and supervisor ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3652EMSE-5#PBF | 42V input, 5V fixed output, 1.1A max, constant-current/constant-voltage charge management; higher IQ (45µA), larger MSOP-10 package. | Targeted at battery charging; lacks programmable peak current and Burst Mode efficiency at light loads. | Select only if battery charging functionality is required; not drop-in for pure 5V regulation. |
| TPS62130ARGTR | 3–17V input, 5V fixed output, 3A max, 17µA IQ, 2.5MHz fixed-frequency PWM; no OVLO, smaller 3mm × 3mm QFN. | Optimized for compact, high-current apps; unsuitable for >17V inputs or surge-prone 24V industrial lines. | Choose for space-constrained consumer designs with stable low-voltage input; avoid for 24V+ or surge-heavy environments. |
Compared with LT3652EMSE-5#PBF and TPS62130ARGTR, the LTC3631EDD-5#PBF uniquely combines 45V input capability, 60V surge tolerance, 12µA IQ, and programmable light-load efficiency - making it irreplaceable for ruggedized 5V regulation in industrial and automotive edge nodes.
Availability
LTC3631EDD-5#PBF is available at Aetrix Electronics and suitable for industrial sensor supply, 4–20mA loop power, and automotive body electronics requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC3631EDD-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 its high-performance power management portfolio, emphasizing reliability, precision, and ruggedness for mission-critical systems.
The LTC3631EDD-5#PBF belongs to Linear's high-voltage monolithic DC/DC converter family, designed specifically for industrial, automotive, and instrumentation applications demanding wide input range, ultra-low IQ, and integrated surge protection.
FAQ
What is the maximum input voltage the LTC3631EDD-5#PBF can safely withstand?
The LTC3631EDD-5#PBF features overvoltage lockout that disables switching above 47–52V, but it is rated to withstand input voltages up to 60V continuously without damage. This makes the LTC3631EDD-5#PBF suitable for automotive load-dump and industrial surge conditions where transient spikes exceed normal operating range.
Does the LTC3631EDD-5#PBF require external compensation components?
No, the LTC3631EDD-5#PBF uses a hysteretic burst-mode control architecture that requires no external compensation. Its internal feedback loop is fully self-contained, enabling stable 5V regulation with only three external components: an inductor, input capacitor, and output capacitor - simplifying layout and reducing BOM cost.
How does the RUN pin function on the LTC3631EDD-5#PBF?
The RUN pin on the LTC3631EDD-5#PBF enables or disables regulation: voltage >1.21V (rising) initiates operation, while voltage <0.7V (falling) forces shutdown with 3µA quiescent current. Internal 110mV hysteresis prevents chatter; the HYST pin provides open-drain output to extend hysteresis externally when needed.
Can the LTC3631EDD-5#PBF operate at 100% duty cycle?
Yes, the LTC3631EDD-5#PBF supports 100% duty-cycle operation, allowing it to maintain regulation even when input voltage drops close to the 5V output - essential for brownout resilience in battery-powered or unregulated industrial supplies where VIN may dip to 5.5V or lower.
What is the thermal performance of the LTC3631EDD-5#PBF in its DFN package?
The LTC3631EDD-5#PBF in the 3mm × 3mm DFN package achieves θJA = 43°C/W when the exposed GND pad is properly soldered to a 1-inch² PCB copper area. At 100mA load and 25°C ambient, junction temperature rise is ~43°C - well within the –40°C to 125°C operating range, enabling reliable operation without forced air or heatsinks.
LTC3631EDD-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN 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-DFN (3x3)
LTC3631EDD-5#PBF FAQ
1.How can I place an order for LTC3631EDD-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3631EDD-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 LTC3631EDD-5#PBF reliable?
The price and inventory of LTC3631EDD-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 LTC3631EDD-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3631EDD-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3631EDD-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3631EDD-5#PBF?
LTC3631EDD-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3631EDD-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 LTC3631EDD-5#PBF?
For technical support, including LTC3631EDD-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3631EDD-5#PBF requirements.
6.How does Aetrix verify that LTC3631EDD-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3631EDD-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 LTC3631EDD-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3631EDD-5#PBF?
All LTC3631EDD-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3631EDD-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 LTC3631EDD-5#PBF part is unused and in its original packaging.
Return procedure for LTC3631EDD-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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