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Analog Devices Inc. LTC3631IDD-5#TRPBF
- Part No.:
- LTC3631IDD-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3631IDD-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 100MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,154
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Product details
Overview
LTC3631IDD-5#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 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- and industrial-supply applications.
For engineers reviewing the LTC3631IDD-5#TRPBF datasheet, LTC3631IDD-5#TRPBF pinout, LTC3631IDD-5#TRPBF application, or LTC3631IDD-5#TRPBF equivalent, key selection considerations include its 5V fixed output, 8-pin 3mm × 3mm DFN package with exposed thermal pad, programmable peak current limit (50–225mA), internal 0.8V ±1% feedback reference, and overvoltage lockout protection up to 60V.
Technical Context
The LTC3631IDD-5#TRPBF implements a hysteretic Burst Mode® control architecture with an internal 0.8V feedback comparator and 5mV hysteresis, enabling automatic transition between active burst cycles and sleep mode. Its peak current limit is set via external resistor on ISET pin or left floating for 225mA default, with average output current capped at half the peak value.
It integrates complementary P-channel high-side and N-channel low-side power switches (RON = 3.0Ω / 1.5Ω), supports internal soft-start (0.75ms) or external capacitor-controlled ramp, and features precise RUN pin threshold (1.21V rising, 1.10V falling) with 110mV hysteresis-enabling robust start-up sequencing and undervoltage/overvoltage lockout (UVLO: 3.75–4.50V; OVLO: 47–52V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 45V - supports wide industrial, automotive, and distributed power rails without pre-regulation |
| Output Voltage | Fixed 5V ±1.2% - eliminates external feedback divider; stable across load and temperature |
| No-Load Quiescent Current | 12µA typical - enables multi-year battery life in always-on sensor or loop-powered systems |
| Max Output Current | 100mA continuous - sufficient for microcontrollers, sensors, and interface ICs in space-constrained designs |
| Peak Current Limit Range | 50mA to 225mA - adjustable via ISET pin resistor to optimize efficiency and component size for specific load profiles |
| Overvoltage Protection | 60V absolute max; 47–52V OVLO trip - safeguards against transients in 24V/36V industrial or automotive systems |
| Package | 8-lead 3mm × 3mm DFN with exposed GND pad - provides low θJA = 43°C/W for passive thermal management |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 9), rated for –40°C to 125°C junction temperature. 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 | Connection point for external inductor; carries high di/dt switching waveform; requires tight layout to minimize EMI |
| VIN (Pin 2) | Main input supply | Accepts 4.5V–45V input; requires local 2.2µF ceramic bypass to GND for stability and ripple suppression |
| ISET (Pin 3) | Peak current programming | Sources 1µA; resistor to GND sets peak inductor current (50–225mA); floating = 225mA default |
| SS (Pin 4) | Soft-start control | Sources 5µA; external capacitor to GND extends ramp time beyond internal 0.75ms for reduced inrush |
| RUN (Pin 5) | Enable/disable control | Active-high logic: >1.21V enables operation; <0.7V forces shutdown (3µA IQ); hysteresis prevents chatter |
| VOUT/VFB (Pin 6) | Output voltage sense / feedback | Direct connection to 5V output for fixed-version regulation; internal 0.8V reference comparison point |
| HYST (Pin 7) | Run hysteresis open-drain output | Pulled low when RUN < 1.2V; used externally to increase RUN pin hysteresis via resistive divider |
| GND (Pin 8 & Pin 9) | Power and thermal ground | Pins 8 and 9 (exposed pad) are internally connected; pad must be soldered to PCB ground for thermal dissipation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Maintains regulation at light loads while drawing only 12µA, enabling >85% efficiency down to 100µA output current |
| Integrated power switches | Eliminates need for external MOSFETs and gate drivers; reduces BOM count and layout complexity |
| No compensation required | Internal hysteretic control loop removes need for external compensation network, simplifying design and validation |
| Low dropout 100% duty cycle | Supports VOUT = VIN operation - critical for brownout recovery and wide-input-range applications |
| Precise RUN threshold with hysteresis | Enables clean, chatter-free power sequencing in noisy environments without external Schmitt triggers |
Applications
| 4–20mA Current Loop Transmitters | Industrial Sensor Power Supplies |
|---|---|
Use Scenario: Powering loop-powered pressure, temperature, or flow transmitters in hazardous or remote locations where supply headroom is limited and standby power must be minimized. IC Role / Device Role / Timing Role: Primary 5V regulator sourcing sensor signal conditioning circuitry and 4–20mA DAC driver from unregulated 12–36V loop supply. Use Value: 12µA quiescent current ensures compliance with loop power budget (<4mA total); wide input range accommodates field wiring drop and surge events. | Use Scenario: Providing stable 5V bias to MEMS accelerometers, RTD interfaces, or analog front-ends in programmable logic controllers (PLCs) and distributed I/O modules. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 24V system rail to isolated 5V for precision analog circuitry. Use Value: 60V surge tolerance protects against inductive kickback from solenoids/relays; low noise and high PSRR preserve ADC accuracy. |
| Distributed Power Systems | Automotive Body Electronics |
Use Scenario: Generating auxiliary 5V rails in telecom or industrial backplanes where multiple point-of-load converters feed FPGA, MCU, or communication PHYs from a shared 12V/24V bus. IC Role / Device Role / Timing Role: Compact, thermally efficient step-down stage replacing discrete buck controllers and external FETs. Use Value: 3mm × 3mm DFN footprint saves board area; 43°C/W θJA allows convection-only cooling in dense layouts. | Use Scenario: Powering infotainment peripherals, door module MCUs, or lighting controllers in 12V vehicle architectures subject to load dump (up to 60V). IC Role / Device Role / Timing Role: Input-tolerant primary regulator handling cold-crank (down to 4.5V) and load-dump (up to 60V) conditions without external TVS. Use Value: Integrated OVLO/UVLO eliminates need for external protection circuitry; -40°C to 125°C rating meets AEC-Q200 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36506RNXR | 65V input, 600mA output, 2.1MHz fixed-frequency PWM; higher IQ (26µA), no Burst Mode | Better suited for higher-current, noise-sensitive applications requiring constant frequency; lacks programmable peak current | Select when >100mA output or EMI filtering predictability is required; not drop-in due to different control scheme and pinout |
| TPS63020DSJR | Buck-boost topology, 1.8–5.5V input, 5V output, 2A capability; 25µA IQ, no HV input support | Required where input can fall below VOUT (e.g., single-cell Li-ion); cannot replace LTC3631IDD-5#TRPBF in 24V+ systems | Choose only for sub-6V input scenarios needing regulation through dropout; incompatible with 4.5–45V range |
Compared with LMR36506RNXR and TPS63020DSJR, the LTC3631IDD-5#TRPBF uniquely balances ultra-low IQ, wide HV input, fixed 5V output, and programmable current limit in a compact DFN-making it optimal for low-power, high-voltage, space-constrained industrial and loop-powered systems where efficiency at microamp loads is critical.
Availability
LTC3631IDD-5#TRPBF is available at Aetrix Electronics and suitable for 4–20mA current loops, industrial sensor power supplies, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3631IDD-5#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 analog and power management ICs with rigorous reliability testing and industrial-grade qualification.
The LTC3631 product line delivers high-efficiency, high-input-voltage DC/DC conversion for harsh-environment applications including industrial automation, process control, and automotive body electronics-designed specifically for reliability under wide temperature, voltage, and load transients.
FAQ
What is the maximum input voltage the LTC3631IDD-5#TRPBF can withstand without damage?
The LTC3631IDD-5#TRPBF has an absolute maximum VIN rating of 60V and includes internal overvoltage lockout that disables switching above 47–52V. This allows the device to survive transient surges up to 60V while maintaining safe operation within its 4.5V–45V functional range. The 60V rating is stress-limited and not intended for continuous operation.
Does the LTC3631IDD-5#TRPBF require external compensation components?
No, the LTC3631IDD-5#TRPBF uses a hysteretic Burst Mode® control architecture with internal feedback compensation. It operates stably with only three external components for fixed-output configurations: input capacitor, output capacitor, and power inductor. No RC networks, op-amps, or compensation pins are needed.
How is the output voltage set for the LTC3631IDD-5#TRPBF?
The LTC3631IDD-5#TRPBF is a fixed 5V output version. Pin 6 (VOUT/VFB) connects directly to the output node, referencing an internal 0.8V ±1% precision bandgap. No external resistor divider is required-unlike adjustable versions-which simplifies layout and improves accuracy over temperature and line regulation.
Can the LTC3631IDD-5#TRPBF operate with 100% duty cycle?
Yes, the LTC3631IDD-5#TRPBF supports 100% duty cycle operation, enabling VOUT regulation even when VIN drops to the output voltage level (e.g., VIN = 5V). This low-dropout capability is essential for brownout recovery in industrial and automotive systems where input voltage may dip near the regulated output.
What thermal considerations apply to the LTC3631IDD-5#TRPBF in the 3mm × 3mm DFN package?
The LTC3631IDD-5#TRPBF in the DFN package has θJA = 43°C/W and requires the exposed thermal pad (Pin 9) to be soldered to a minimum 100mm² copper pour on the PCB for effective heat dissipation. Without proper pad connection, junction temperature rise exceeds specifications, risking thermal shutdown or long-term reliability degradation.
LTC3631IDD-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN 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):
- 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)
LTC3631IDD-5#TRPBF FAQ
1.How can I place an order for LTC3631IDD-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3631IDD-5#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 LTC3631IDD-5#TRPBF reliable?
The price and inventory of LTC3631IDD-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3631IDD-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3631IDD-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3631IDD-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3631IDD-5#TRPBF?
LTC3631IDD-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3631IDD-5#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 LTC3631IDD-5#TRPBF?
For technical support, including LTC3631IDD-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3631IDD-5#TRPBF requirements.
6.How does Aetrix verify that LTC3631IDD-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3631IDD-5#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 LTC3631IDD-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3631IDD-5#TRPBF?
All LTC3631IDD-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3631IDD-5#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 LTC3631IDD-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3631IDD-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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