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Analog Devices Inc. LTC3621EDCB-5#TRPBF
- Part No.:
- LTC3621EDCB-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621EDCB-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,333
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Product details
Overview
LTC3621EDCB-5#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in a 6-lead DFN (2mm × 3mm) package, operating at fixed 1MHz switching frequency with 5V fixed output, ±1% output voltage accuracy, and ultralow 3.5µA quiescent current - deployed in automotive infotainment power rails where low standby power and compact layout are critical.
For engineers reviewing the LTC3621EDCB-5#TRPBF datasheet, LTC3621EDCB-5#TRPBF pinout, LTC3621EDCB-5#TRPBF application, or LTC3621EDCB-5#TRPBF equivalent, this page delivers verified electrical parameters, thermal performance data, mode-select behavior, and real-world design constraints for high-efficiency DC/DC conversion in space-constrained industrial and automotive systems.
Technical Context
The LTC3621EDCB-5#TRPBF implements constant-frequency peak-current-mode control with internal compensation and soft-start. It supports three operating modes-Burst Mode (3.5µA IQ), pulse-skipping (low ripple), and forced continuous-selected via the MODE/SYNC pin.
It features integrated PMOS/NMOS power switches with RDS(ON) of 0.37Ω (top) and 0.15Ω (bottom), overtemperature protection, VIN overvoltage lockout at 19V, and undervoltage lockout at 2.7V - enabling robust operation across wide input transients and thermal stress conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports direct connection to 12V automotive battery rails including cold-crank and load-dump conditions. |
| Output Voltage | Fixed 5V ±1% - eliminates external feedback resistors and ensures stable USB-peripheral or microcontroller I/O rail regulation. |
| Switching Frequency | 1MHz (±8%) - enables use of small 2.2µH inductors and reduces EMI filtering burden in dense PCB layouts. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on automotive modules such as telematics wake-up receivers. |
| Max Output Current | 1A continuous - sufficient to power dual-core ARM Cortex-M7 MCUs with peripherals without external boost stages. |
| Thermal Range | –40°C to +125°C junction - qualified for under-hood automotive environments per AEC-Q100 Grade E. |
| Package | 6-lead DFN (2mm × 3mm) with exposed GND pad - provides 64°C/W θJA for passive thermal management in sealed enclosures. |
Pinout & Package
6-lead DFN (2mm × 3mm) package with exposed thermal pad (Pin 7) soldered to PCB ground for optimal thermal dissipation and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects directly to inductor; carries high di/dt square-wave current - requires tight loop area and local ceramic decoupling. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - must be bypassed with ≥10µF ceramic capacitor. |
| RUN (Pin 3) | Enable control | Logic-high (>1.0V) enables regulation; logic-low (<0.3V) shuts down IC with <0.1µA shutdown current. |
| FB (Pin 4) | Feedback input | Internally tied to 5V output - no external divider needed; monitors regulation accuracy and triggers PGOOD assertion. |
| INTVCC (Pin 5) | Internal LDO output | 3.6V regulated supply for gate drivers and analog circuitry - requires ≥1µF ceramic bypass to GND. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to INTVCC for Burst Mode, GND for pulse-skipping, or external clock (1.0–2.4V) for synchronization - determines light-load efficiency vs. output ripple trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - ideal for always-on vehicle network nodes requiring >1-year battery hold-up. |
| Integrated power MOSFETs | 0.37Ω PMOS top switch + 0.15Ω NMOS bottom switch - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Internal soft-start | 800µs controlled ramp - prevents inrush current and output overshoot during power-up in systems with large downstream capacitance. |
| Overvoltage/undervoltage protection | 19V VIN OVP and 2.7V UVLO with hysteresis - protects against load dump and brownout without external supervision circuitry. |
| AEC-Q100 qualification | Grade E (–40°C to +125°C) - meets automotive reliability requirements for non-safety-critical power subsystems. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powers display controller, touch interface, and audio codec in head-unit designs with 12V battery input and strict EMC limits. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering clean, low-noise power with minimal board area. Use Value: 1MHz switching avoids AM radio band interference; 3.5µA IQ extends sleep-mode battery life in parked-vehicle scenarios. | Use Scenario: Supplies 5V to low-power wireless sensor MCU (e.g., Nordic nRF52840) and analog front-end in battery-operated condition monitoring devices. IC Role / Device Role / Timing Role: Main system regulator enabling deep-sleep wake-up cycles with sub-µA system standby. Use Value: Fixed 5V output eliminates resistor tolerance errors; DFN package fits within 100mm² footprint constraints. |
| Emergency Radio Power Management | Portable Handheld Scanner |
Use Scenario: Provides regulated 5V from primary alkaline or Li-ion battery in emergency communication radios requiring multi-day standby. IC Role / Device Role / Timing Role: High-efficiency step-down converter supporting both active transmit and ultra-low-power listen modes. Use Value: Burst Mode cuts IQ to 3.5µA - extends shelf life beyond 2 years without battery replacement. | Use Scenario: Powers image sensor, laser driver, and Bluetooth module in handheld barcode scanners powered by single-cell Li-ion. IC Role / Device Role / Timing Role: Compact 5V source enabling fast wake-from-sleep response and consistent decode performance. Use Value: 1A capability handles peak laser pulse currents; 1MHz frequency allows use of tiny 2.2µH shielded inductors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.0V–17V input, 5V fixed output, 1.2MHz, 2.5µA IQ, 2A rating, 3mm × 3mm QFN | Higher output current and lower IQ, but lacks AEC-Q100 qualification and has different pinout | Select when higher current headroom and lowest possible IQ are required, and automotive qualification is not mandatory. |
| MP2315GJ-Z | 4.5V–26V input, 5V fixed output, 2MHz, 22µA IQ, 1.5A rating, 2mm × 2mm TSOT23-6 | Wider VIN range and smaller package, but higher quiescent current and no Burst Mode | Select for cost-sensitive industrial applications with >4.5V minimum input and no requirement for sub-5µA standby. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621EDCB-5#TRPBF offers AEC-Q100 qualification, true 3.5µA Burst Mode operation, and optimized thermal resistance in its 2mm × 3mm DFN - making it the preferred choice for automotive-grade 5V point-of-load regulation where reliability and ultra-low IQ are prioritized over raw current headroom or minimum footprint.
Availability
LTC3621EDCB-5#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and portable handheld scanners requiring stable component supply, long-lifecycle support, and guaranteed AEC-Q100 compliance.
Supply support for LTC3621EDCB-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LTC3621 product line delivers high-efficiency, ultralow-IQ monolithic buck regulators for battery-powered and automotive applications where extended standby time and robust transient response are essential.
FAQ
What is the switching frequency of the LTC3621EDCB-5#TRPBF?
The LTC3621EDCB-5#TRPBF operates at a fixed 1MHz switching frequency with ±8% variation over temperature and input voltage. This frequency is factory-trimmed and cannot be adjusted externally - it enables compact magnetics and predictable EMI filtering in automotive and industrial designs where spectral content must avoid sensitive bands like AM radio.
Does the LTC3621EDCB-5#TRPBF require external feedback resistors?
No, the LTC3621EDCB-5#TRPBF is a fixed 5V output variant - the FB pin is internally connected to the output, eliminating the need for external resistors. This simplifies layout, improves accuracy (±1% VOUT), and removes resistor tolerance and drift errors that affect adjustable versions of the LTC3621 family.
What is the maximum junction temperature specification for the LTC3621EDCB-5#TRPBF?
The LTC3621EDCB-5#TRPBF is rated for a maximum junction temperature of +125°C and is specified over –40°C to +125°C operating junction range (Grade E). Its 64°C/W θJA in the DFN package allows full 1A output in ambient temperatures up to +85°C with minimal copper area, provided the exposed pad is properly soldered to PCB ground.
How does the MODE/SYNC pin function on the LTC3621EDCB-5#TRPBF?
The MODE/SYNC pin on the LTC3621EDCB-5#TRPBF selects operating mode: tie to INTVCC for Burst Mode (3.5µA IQ), ground for pulse-skipping (lowest ripple), or apply 1.0–2.4V for forced continuous mode or external clock synchronization. Unlike adjustable variants, it does not configure output voltage - that is fixed at 5V.
Is the LTC3621EDCB-5#TRPBF AEC-Q100 qualified?
Yes, the LTC3621EDCB-5#TRPBF is AEC-Q100 qualified for automotive applications (Grade E, –40°C to +125°C). This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD - confirming suitability for non-safety-critical automotive subsystems such as infotainment, telematics, and body electronics.
LTC3621EDCB-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LTC3621EDCB-5#TRPBF FAQ
1.How can I place an order for LTC3621EDCB-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EDCB-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 LTC3621EDCB-5#TRPBF reliable?
The price and inventory of LTC3621EDCB-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 LTC3621EDCB-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EDCB-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EDCB-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EDCB-5#TRPBF?
LTC3621EDCB-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EDCB-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 LTC3621EDCB-5#TRPBF?
For technical support, including LTC3621EDCB-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EDCB-5#TRPBF requirements.
6.How does Aetrix verify that LTC3621EDCB-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EDCB-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 LTC3621EDCB-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EDCB-5#TRPBF?
All LTC3621EDCB-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EDCB-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 LTC3621EDCB-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621EDCB-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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