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Analog Devices Inc. LTC3621IDCB-3.3#TRMPBF
- Part No.:
- LTC3621IDCB-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621IDCB-3.3#TRMPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,388
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Product details
Overview
LTC3621IDCB-3.3#TRMPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in a 6-lead DFN (2mm × 3mm) package, delivering fixed 3.3V output with ±1% accuracy, 2.25MHz switching frequency, and 3.5µA quiescent current-designed for low-power industrial sensors and portable handheld scanners requiring high efficiency at light loads.
For engineers reviewing the LTC3621IDCB-3.3#TRMPBF datasheet, LTC3621IDCB-3.3#TRMPBF pinout, LTC3621IDCB-3.3#TRMPBF application, or LTC3621IDCB-3.3#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across –40°C to 125°C, and real-world application mappings for automotive-grade power management design.
Technical Context
The LTC3621IDCB-3.3#TRMPBF implements a constant-frequency peak current mode architecture with internal compensation, supporting forced continuous, pulse-skipping, and Burst Mode® operation via the MODE/SYNC pin. It features ultralow 3.5µA quiescent current in shutdown and maintains regulation down to VIN = VOUT (100% duty cycle) with full dropout capability.
Its 2.25MHz switching frequency enables compact external components (e.g., 2.2µH inductor, 22µF ceramic output capacitor), while integrated overtemperature protection, VIN overvoltage lockout (19V), and undervoltage lockout (2.7V) ensure robust operation in automotive and embedded environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V with ±1% accuracy over temperature and line/load-enables direct replacement of LDOs without feedback divider design. |
| Input Voltage Range | 2.7V to 17V-supports wide-input applications including 12V automotive rails and multi-cell battery systems. |
| Switching Frequency | 2.25MHz ±10% (E/I-grade)-allows use of small inductors and ceramic capacitors; synchronizable to external clock ±40%. |
| Quiescent Current | 3.5µA in Burst Mode-extends battery life in always-on sensor nodes and emergency radios. |
| Output Current | 1A continuous-sufficient for powering microcontrollers, RF transceivers, and analog front-ends in compact designs. |
| Thermal Range | –40°C to +125°C junction-qualified for industrial and automotive under-hood applications per AEC-Q100 requirements. |
| Package | 6-lead DFN (2mm × 3mm) with exposed GND pad-provides low thermal resistance (θJA = 64°C/W) and space-efficient layout. |
Pinout & Package
6-lead DFN (2mm × 3mm) package with exposed thermal pad (Pin 7) soldered to PCB ground for optimal thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects directly to inductor; carries high di/dt switching current-requires tight layout and Kelvin connection to minimize ringing. |
| VIN (Pin 2) | Input supply | Accepts 2.7V–17V input; powers internal LDO (INTVCC) and gate drivers-must be bypassed with ≥10µF ceramic capacitor near pin. |
| RUN (Pin 3) | Enable control | Active-high logic input; pulls low to disable regulator and reduce VIN current to 0.1µA-prevents floating via pull-down resistor if unused. |
| FB (Pin 4) | Feedback reference | Internally tied to 3.3V output; no external divider required-simplifies layout and eliminates resistor tolerance errors. |
| INTVCC (Pin 5) | Internal LDO output | 3.6V regulated supply for gate drivers and bias circuits-requires ≥1µF ceramic bypass to GND for stability. |
| MODE/SYNC (Pin 6) | Operating mode select | Configures Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous (apply 1V–2.4V); also accepts external sync clock. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 3.5µA at light loads while maintaining regulation-critical for battery-powered emergency radios and IoT edge nodes. |
| 2.25MHz fixed-frequency switching | Enables use of sub-3mm inductors and low-ESR ceramic capacitors-reduces solution size by >40% vs. 500kHz alternatives. |
| Full dropout operation | Maintains regulation down to VIN = VOUT with 100% duty cycle-supports brownout resilience in automotive start-stop systems. |
| Integrated soft-start | 800µs internal ramp prevents inrush current-eliminates need for external soft-start circuitry in portable medical devices. |
| AEC-Q100 qualified | Rated for –40°C to +125°C operation with automotive reliability testing-meets functional safety requirements for ADAS power rails. |
Applications
| Portable-Handheld Scanners | Industrial and Embedded Computing |
|---|---|
|
Use Scenario: Battery-powered barcode scanner with ARM Cortex-M4 MCU, BLE radio, and laser driver requiring stable 3.3V rail during intermittent high-current bursts. IC Role / Device Role / Timing Role: Primary DC/DC converter supplying core logic and interface peripherals with fast transient response and ultra-low sleep current. Use Value: 3.5µA quiescent current extends 2000mAh Li-ion battery life to >12 months in standby; 2.25MHz switching minimizes EMI interference with sensitive optical sensors. |
Use Scenario: DIN-rail mounted PLC I/O module powered from 24V DC bus, needing isolated 3.3V for microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Non-isolated buck stage providing clean, regulated 3.3V with high PSRR and low noise for digital logic and communication interfaces. Use Value: ±1% output accuracy ensures reliable ADC reference and UART timing; 17V max input withstands 24V transients per IEC 61000-4-5. |
| Automotive Applications | Emergency Radio |
|
Use Scenario: Rear-seat entertainment system with HDMI transmitter, audio codec, and touch controller operating from 12V vehicle battery with cold-crank voltage dips. IC Role / Device Role / Timing Role: Point-of-load regulator delivering 3.3V to SoC subsystems with full dropout support and AEC-Q100 qualification. Use Value: Operates down to 2.7V input and sustains 100% duty cycle during cranking events; thermal shutdown protects against under-dash ambient up to 125°C. |
Use Scenario: Hand-cranked emergency radio with supercapacitor energy storage, requiring efficient 3.3V conversion from variable 1.8V–5.5V input. IC Role / Device Role / Timing Role: High-efficiency buck converter enabling longest possible transmit time per crank cycle with minimal voltage droop. Use Value: 95% peak efficiency at 500mA load maximizes usable energy; Burst Mode extends standby time to >30 days on single 10F supercapacitor charge. |
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, 3.3V fixed, 2.25MHz, but 15µA IQ in deep sleep-higher than LTC3621IDCB-3.3#TRMPBF's 3.5µA. | Less suitable for multi-year battery life; lacks AEC-Q100 qualification and full dropout operation. | Select when cost sensitivity outweighs ultra-low IQ and automotive compliance requirements. |
| MAX17504ATP+T | 4.5V–60V input, adjustable output, 2.2MHz, 100µA IQ-orders of magnitude higher quiescent current. | Designed for high-voltage industrial inputs, not low-VIN battery or automotive applications. | Choose only when input exceeds 17V or adjustable output is mandatory; not drop-in for 3.3V fixed use cases. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3621IDCB-3.3#TRMPBF delivers superior light-load efficiency, guaranteed automotive temperature range, and true dropout capability-making it the optimal choice for space-constrained, battery-sensitive, and automotive-qualified designs where 3.3V fixed output is required.
Availability
LTC3621IDCB-3.3#TRMPBF is available at Aetrix Electronics and suitable for portable-handheld scanners, industrial PLCs, and automotive infotainment systems requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant power conversion.
Supply support for LTC3621IDCB-3.3#TRMPBF 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 precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3621 series is part of Analog Devices' Power by Linear™ portfolio, engineered specifically for ultra-low-power, high-efficiency DC/DC conversion in space- and battery-constrained applications demanding AEC-Q100 reliability.
FAQ
What is the maximum input voltage rating for the LTC3621IDCB-3.3#TRMPBF?
The LTC3621IDCB-3.3#TRMPBF has an absolute maximum input voltage of 17V. Its VIN overvoltage lockout activates at 19V (rising) with 300mV hysteresis, suspending switching until VIN drops below 18.7V. This protects internal MOSFETs during load dump transients in automotive 12V systems. Operation is guaranteed from 2.7V to 17V per datasheet specifications.
Does the LTC3621IDCB-3.3#TRMPBF require external feedback resistors?
No, the LTC3621IDCB-3.3#TRMPBF does not require external feedback resistors. As a fixed-output variant, its FB pin is internally connected to the 3.3V output-eliminating resistor selection, placement, and tolerance errors. This simplifies layout, improves accuracy (±1% over temperature), and reduces bill-of-materials count compared to adjustable versions like LTC3621IDCB-2#TRMPBF.
How does the MODE/SYNC pin configure operating modes on the LTC3621IDCB-3.3#TRMPBF?
The MODE/SYNC pin configures three distinct modes: tie to INTVCC for Burst Mode® (3.5µA IQ), ground for pulse-skipping (lowest ripple), or apply 1.0V–2.4V for forced continuous (best transient response). It also accepts external clock signals within ±40% of 2.25MHz for EMI reduction. The LTC3621IDCB-3.3#TRMPBF's datasheet specifies exact voltage thresholds and behavior for each configuration.
Is the LTC3621IDCB-3.3#TRMPBF qualified for automotive applications?
Yes, the LTC3621IDCB-3.3#TRMPBF is AEC-Q100 qualified for automotive applications. It operates across –40°C to +125°C junction temperature, includes overtemperature protection, and meets stringent reliability requirements for under-hood and infotainment systems. Its 17V input range and 2.7V UVLO support cold-crank and load-dump conditions per ISO 16750.
What thermal performance can be expected from the LTC3621IDCB-3.3#TRMPBF in its DFN package?
The LTC3621IDCB-3.3#TRMPBF in the 6-lead DFN (2mm × 3mm) package has θJA = 64°C/W and θJC = 9.6°C/W when the exposed pad (Pin 7) is properly soldered to a minimum 100mm² copper area. At 1A load and 12V input, typical power dissipation is <350mW-resulting in ~22°C rise above ambient, well within the 125°C max junction limit even in sealed enclosures.
LTC3621IDCB-3.3#TRMPBF 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):
- 3.3V
- 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)
LTC3621IDCB-3.3#TRMPBF FAQ
1.How can I place an order for LTC3621IDCB-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IDCB-3.3#TRMPBF 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-3.3#TRMPBF reliable?
The price and inventory of LTC3621IDCB-3.3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621IDCB-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IDCB-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IDCB-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IDCB-3.3#TRMPBF?
LTC3621IDCB-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IDCB-3.3#TRMPBF 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-3.3#TRMPBF?
For technical support, including LTC3621IDCB-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IDCB-3.3#TRMPBF requirements.
6.How does Aetrix verify that LTC3621IDCB-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IDCB-3.3#TRMPBF 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-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IDCB-3.3#TRMPBF?
All LTC3621IDCB-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IDCB-3.3#TRMPBF, 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-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621IDCB-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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