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Analog Devices Inc. LTC3621IDCB-25#TRPBF
- Part No.:
- LTC3621IDCB-25#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621IDCB-25#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,317
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Product details
Overview
LTC3621IDCB-25#TRPBF from Analog Devices is a 2.25MHz, 5V fixed-output synchronous step-down regulator delivering up to 1A output current with 3.5µA quiescent current and ±1% output voltage accuracy. It operates from 2.7V to 17V input, supports full-dropout operation, and integrates internal compensation and soft-start. This device is used in automotive infotainment power rails where low-noise, high-efficiency, and AEC-Q100-compliant regulation are required.
For engineers reviewing the LTC3621IDCB-25#TRPBF datasheet, LTC3621IDCB-25#TRPBF pinout, LTC3621IDCB-25#TRPBF application, or LTC3621IDCB-25#TRPBF equivalent, key selection criteria include its 2.25MHz switching frequency for compact filter design, 5V fixed output with no external feedback resistors, ultralow IQ for battery-backed systems, and DFN (2mm × 3mm) package with exposed thermal pad for high-power-density layouts.
Technical Context
The LTC3621IDCB-25#TRPBF uses constant-frequency peak current mode control with internal slope compensation, enabling stable operation up to 100% duty cycle during dropout. Its MODE/SYNC pin supports three operating modes: pulse-skipping (low ripple), Burst Mode® (3.5µA IQ), and forced continuous (fixed-frequency, zero-load capable).
It features integrated 0.37Ω PMOS top switch and 0.15Ω NMOS bottom switch, 0.6V reference with ±1% accuracy over –40°C to 125°C, and built-in overtemperature protection. The device is AEC-Q100 qualified (Grade I) and includes VIN overvoltage lockout (19V trip) and VINTVCC undervoltage lockout (2.6V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external feedback divider, reduces BOM count and layout area. |
| Switching Frequency | 2.25MHz ±20% - enables use of sub-µH inductors and 10µF–22µF ceramic output capacitors for space-constrained designs. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on automotive or portable monitoring systems. |
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery-supplied applications including cold-crank (6V) and load-dump (16V) conditions. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Thermal Performance | θJA = 64°C/W (DFN), TJMAX = 125°C - requires minimal PCB copper area for thermal relief in sealed enclosures. |
| Accuracy & Stability | ±1% VOUT accuracy, internal compensation - ensures regulation stability without external loop components across temperature and line/load variations. |
Pinout & Package
Package: 6-Lead (2mm × 3mm) Plastic DFN with exposed thermal pad (Pin 7 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square wave - must be routed with short, low-inductance path to minimize EMI and voltage spikes. |
| VIN (Pin 2) | Input supply | Accepts 2.7V–17V; bypassed with ≥10µF ceramic capacitor placed adjacent to pin to suppress high-frequency noise. |
| RUN (Pin 3) | Enable control | Active-high logic input; pull high via resistor or microcontroller GPIO to start regulation; tie low to disable and enter shutdown (0.1µA IQ). |
| FB (Pin 4) | Feedback input | Internally connected to 5V output - no external resistor divider needed; unused in fixed-output variants. |
| MODE/SYNC (Pin 6) | Operating mode select / clock sync | Ground for pulse-skipping (low ripple); connect to INTVCC for Burst Mode® (ultralow IQ); apply external 1.3–2.4V clock for synchronization. |
| GND (Exposed Pad) | Power and signal ground | Mandatory thermal and electrical connection to PCB ground plane; insufficient soldering causes thermal shutdown or regulation drift. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for >1-year battery life in IoT edge nodes. |
| 2.25MHz fixed switching frequency | Enables <1µH inductors and small ceramic capacitors - shrinks total solution size by >40% vs 500kHz alternatives. |
| Integrated power switches | 0.37Ω PMOS + 0.15Ω NMOS FETs - eliminate external MOSFETs and drivers, reducing component count and layout complexity. |
| Full dropout capability | Maintains regulation down to VIN = VOUT with continuous conduction - supports brownout resilience in automotive 12V systems. |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with extended reliability testing - suitable for under-hood and dashboard electronics. |
Applications
| Automotive Infotainment Power Rail | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powers DSP, display controller, and CAN transceiver in vehicle head unit with 12V battery input subject to cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Primary 5V buck regulator providing clean, regulated power with fast transient response and fault protection. Use Value: 2.25MHz operation avoids AM radio band interference; AEC-Q100 qualification ensures compliance with automotive reliability standards. |
Use Scenario: Supplies 5V to low-power MCU, analog sensor front-end, and LoRaWAN transceiver in remote environmental monitor powered by LiSOCl₂ battery. IC Role / Device Role / Timing Role: High-efficiency, ultralow-IQ DC/DC converter enabling multi-year battery life in intermittent wake-up operation. Use Value: 3.5µA quiescent current in Burst Mode® minimizes standby drain; fixed 5V output simplifies design and improves long-term voltage stability. |
| Portable Medical Scanner | Emergency Radio Power Management |
Use Scenario: Powers FPGA, image sensor, and ADC in handheld ultrasound scanner using single-cell Li-ion (3.0–4.2V) with boost-buck architecture. IC Role / Device Role / Timing Role: Secondary 5V regulator accepting boosted intermediate rail; delivers stable power during rapid imaging bursts. Use Value: Forced continuous mode eliminates output ripple during data acquisition; internal soft-start prevents inrush-induced system reset. |
Use Scenario: Regulates 5V for microcontroller, audio amplifier, and SSB receiver in battery-powered emergency radio with manual crank charging. IC Role / Device Role / Timing Role: Main system supply managing variable input from supercapacitor bank charged via hand-crank generator. Use Value: Wide 2.7–17V input range accommodates supercap discharge curve; dropout operation maintains function until <3.0V remaining. |
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 | 3MHz fixed frequency, 3.0–17V input, adjustable VOUT only (no 5V fixed variant); 1.2A output; 17µA IQ in PFM mode. | Lacks factory-trimmed 5V option - requires external resistors; higher IQ reduces battery runtime in always-on use cases. | Select when adjustable output or higher current is needed; avoid if fixed 5V and ultralow IQ are mandatory. |
| MP2315GJ-Z | 2MHz fixed frequency, 4.5–26V input, 5V fixed output; 1.2A output; 26µA IQ; no Burst Mode®, only pulse-skipping. | Higher minimum input voltage excludes 3.3V or Li-ion direct use; no AEC-Q100 qualification limits automotive deployment. | Choose for cost-sensitive industrial applications where automotive qualification and sub-5µA IQ are not required. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621IDCB-25#TRPBF uniquely combines factory-trimmed 5V output, 3.5µA IQ, AEC-Q100 Grade I rating, and 2.25MHz operation - making it optimal for space- and power-constrained automotive and portable medical designs requiring guaranteed accuracy and long service life.
Availability
LTC3621IDCB-25#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and portable medical scanners requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3621IDCB-25#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3621 family is designed for high-efficiency, ultralow-quiescent-current DC/DC conversion in space-constrained and battery-sensitive applications - emphasizing precision regulation, thermal robustness, and automotive-grade reliability.
FAQ
What is the output voltage tolerance of the LTC3621IDCB-25#TRPBF?
The LTC3621IDCB-25#TRPBF provides a factory-trimmed 5.0V output with ±1% accuracy over –40°C to +125°C junction temperature and full line/load conditions. This is specified in the Electrical Characteristics table as 4.95V to 5.05V at TJ = 25°C and 4.925V to 5.075V over temperature, ensuring tight regulation without external calibration.
Does the LTC3621IDCB-25#TRPBF require external feedback resistors?
No. The LTC3621IDCB-25#TRPBF is a fixed 5V output variant - the FB pin is internally connected to the output, eliminating the need for external resistors. This reduces component count, saves PCB area, and improves long-term voltage stability by removing resistor drift and layout sensitivity.
How does the MODE/SYNC pin configure operating modes on the LTC3621IDCB-25#TRPBF?
The MODE/SYNC pin selects between three modes: grounded for pulse-skipping (lowest output ripple), tied to INTVCC for Burst Mode® (3.5µA IQ), or biased to 1.0–2.4V for forced continuous operation. External clock injection synchronizes switching to ±40% of 2.25MHz and forces continuous mode - no configuration resistor is needed.
Is the LTC3621IDCB-25#TRPBF qualified for automotive applications?
Yes. The LTC3621IDCB-25#TRPBF is AEC-Q100 Grade I qualified (–40°C to +125°C), with manufacturing and test processes validated for automotive reliability. It includes VIN overvoltage lockout (19V), thermal shutdown, and robust ESD protection - meeting requirements for infotainment, telematics, and body electronics.
What thermal considerations apply to the LTC3621IDCB-25#TRPBF in a 1A application?
With θJA = 64°C/W and 1A load at 12V→5V (5W dissipation), junction temperature rise is ~320°C above ambient - exceeding TJMAX. Real-world thermal design requires ≥2 cm² of 2-oz copper connected to the exposed pad, plus airflow or heatsinking. At 500mA load, rise is ~160°C, making proper pad soldering and PCB copper essential for reliable operation.
LTC3621IDCB-25#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:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LTC3621IDCB-25#TRPBF FAQ
1.How can I place an order for LTC3621IDCB-25#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IDCB-25#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 LTC3621IDCB-25#TRPBF reliable?
The price and inventory of LTC3621IDCB-25#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621IDCB-25#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IDCB-25#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IDCB-25#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IDCB-25#TRPBF?
LTC3621IDCB-25#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IDCB-25#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 LTC3621IDCB-25#TRPBF?
For technical support, including LTC3621IDCB-25#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IDCB-25#TRPBF requirements.
6.How does Aetrix verify that LTC3621IDCB-25#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IDCB-25#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 LTC3621IDCB-25#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IDCB-25#TRPBF?
All LTC3621IDCB-25#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IDCB-25#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 LTC3621IDCB-25#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621IDCB-25#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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