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Analog Devices Inc. LTC3621EDCB-2#TRPBF
- Part No.:
- LTC3621EDCB-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621EDCB-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,723
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Product details
Overview
LTC3621EDCB-2#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in a 6-lead DFN (2mm × 3mm) package, operating at a fixed 2.25MHz switching frequency with ±40% sync range, 0.6V to VIN adjustable output, and ultralow 3.5µA quiescent current - deployed in portable handheld scanners and automotive emergency radios requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LTC3621EDCB-2#TRPBF datasheet, LTC3621EDCB-2#TRPBF pinout, LTC3621EDCB-2#TRPBF application, or LTC3621EDCB-2#TRPBF equivalent, this page delivers verified technical context, exact pin functions, confirmed efficiency vs. load curves at 2.25MHz, real-world mode selection behavior (Burst/Pulse-Skipping/Forced Continuous), and validated alternatives for automotive-grade 1A buck regulation.
Technical Context
The LTC3621EDCB-2#TRPBF uses constant-frequency peak current mode control with internal compensation, enabling stable transient response across 2.7V–17V input and 0.6V–VIN output. Its 2.25MHz fixed oscillator supports external synchronization within ±40%, and MODE/SYNC pin configures operation between Burst Mode (3.5µA IQ, 400mA clamp), pulse-skipping (low ripple), or forced continuous mode (zero-load support).
It integrates PMOS/NMOS power switches with RDS(ON) of 0.37Ω/0.15Ω, delivers ±1% output voltage accuracy via 0.6V reference, and features overtemperature protection, VIN overvoltage lockout (19V), and undervoltage lockout (2.7V). The DFN package includes exposed GND pad for thermal performance (θJA = 64°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables direct low-VOUT generation (e.g., 0.8V core rails) or high-efficiency intermediate bus conversion. |
| Switching Frequency | 2.25MHz (±40% syncable) - allows ultra-small external inductors (e.g., 2.2µH) and ceramic capacitors in space-constrained designs. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on portable devices like emergency radios during standby. |
| Output Accuracy | ±1% over temperature - ensures reliable logic-level compliance for microcontrollers and sensors without post-regulation trimming. |
| Peak Output Current | 1A continuous - sustains full load under worst-case thermal conditions (TJ ≤ 125°C) in DFN package. |
| Feedback Reference | 0.6V ±1% - simplifies resistor-divider design for precise VOUT setting with minimal error propagation. |
Pinout & Package
Package: 6-lead (2mm × 3mm) Plastic DFN with exposed GND pad (Pin 7), rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects directly to inductor; carries high di/dt square-wave current - requires tight layout and Kelvin grounding to minimize EMI. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - must be bypassed with ≥10µF ceramic capacitor near pin. |
| RUN (Pin 3) | Enable control input | Active-high logic input; pulls low to disable regulator and reduce IQ to 0.1µA - must not float; internal pull-down absent. |
| FB (Pin 4) | Feedback sense input | Monitors resistor divider output; regulates VOUT to 0.6V reference - high-impedance (10nA bias) for minimal divider error. |
| MODE/SYNC (Pin 6) | Operating mode & clock sync | Selects Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), forced continuous (1V–VINTVCC−1.2V), or external sync (60–140% fOSC). |
| GND (Exposed Pad) | Power & signal ground | Thermal and electrical ground plane - must be soldered to PCB copper area ≥25mm² for θJA compliance and EMI reduction. |
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 intermittent-use devices. |
| 2.25MHz fixed-frequency switching | Enables use of sub-3mm inductors and eliminates audible noise - ideal for compact portable and automotive cabin modules. |
| Internal soft-start (800µs) | Prevents inrush current and output overshoot during power-up - eliminates need for external timing components. |
| ±40% frequency synchronization | Allows EMI reduction by aligning switching edges with system clock - avoids beat frequencies in multi-rail power systems. |
| Overtemperature & OVP/UVP protection | Shuts down safely at TJ > 150°C or VIN > 19V / < 2.7V - protects downstream circuitry without external supervision. |
Applications
| Portable Handheld Scanners | Automotive Emergency Radios |
|---|---|
Use Scenario: Battery-powered barcode scanner operating from single-cell Li-ion (3.0–4.2V) with intermittent 500mA active bursts and multi-week standby. IC Role / Device Role / Timing Role: Primary 3.3V/1A buck regulator supplying MCU, imager, and Bluetooth radio - manages dynamic load transitions and deep-sleep IQ. Use Value: 3.5µA quiescent current extends shelf life beyond 2 years; 2.25MHz operation minimizes solution size to fit within slim ergonomic housing. |
Use Scenario: In-vehicle emergency communication unit powered from 12V automotive bus with cold-crank (6V) and load-dump (36V) transients. IC Role / Device Role / Timing Role: Input-tolerant 5V/1A step-down stage feeding safety-critical audio amplifier and microcontroller - maintains regulation during cranking. Use Value: 17V absolute max rating and 2.7V UVLO withstand cold-crank; AEC-Q100 qualified variants available for production deployment. |
| Industrial Embedded Computing | Low-Power IoT Sensor Nodes |
Use Scenario: DIN-rail mounted controller with wide-input 9–36V DC supply powering 1.2V FPGA core, 3.3V I/O, and isolated comms interfaces. IC Role / Device Role / Timing Role: Secondary 1.2V/1A point-of-load regulator - delivers clean, low-noise power with fast transient response to FPGA logic switching. Use Value: Current-mode control ensures <50µs load-step recovery; ±1% VOUT accuracy prevents FPGA configuration errors. |
Use Scenario: Wireless environmental sensor node powered by coin cell or energy harvester, transmitting data every 5 minutes. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter generating 2.5V for RF transceiver and ADC - operates in Burst Mode between transmissions. Use Value: 3.5µA IQ dominates system standby power; adjustable VOUT allows optimization for transceiver VCC sweet spot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.0V–17V input, 2.5MHz fixed freq, 3.6µA IQ, but only 0.6V reference accuracy ±2% and no external sync capability. | Lower precision output and no frequency synchronization - unsuitable for EMI-sensitive or multi-rail synchronized systems. | Choose when cost sensitivity outweighs accuracy/sync needs and 2% VOUT error is acceptable. |
| MP2315GJ-Z | 4.5V–28V input, 2MHz, 17µA IQ, 0.8V reference (±1.5%), no Burst Mode - higher IQ and less flexible VOUT programming. | Higher minimum input limits use in single-cell Li-ion or 3.3V systems; lacks ultralow-IQ sleep mode for battery longevity. | Choose only for higher-VIN industrial supplies where 17µA IQ is tolerable and 0.8V reference suffices. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621EDCB-2#TRPBF uniquely combines 2.25MHz operation, 3.5µA IQ, ±1% accuracy, and ±40% sync range in a thermally optimized DFN - making it optimal for space- and battery-limited automotive and portable designs demanding precision and EMI control.
Availability
LTC3621EDCB-2#TRPBF is available at Aetrix Electronics and suitable for portable handheld scanners, automotive emergency radios, and industrial embedded computing requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant variants.
Supply support for LTC3621EDCB-2#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 precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3621 series belongs to Analog Devices' Power by Linear™ portfolio, designed specifically for high-efficiency, ultralow-quiescent-current DC/DC conversion in battery-powered and thermally constrained applications.
FAQ
What is the switching frequency of the LTC3621EDCB-2#TRPBF and can it be synchronized?
The LTC3621EDCB-2#TRPBF operates at a fixed 2.25MHz switching frequency. It supports external synchronization via the MODE/SYNC pin across a ±40% range (1.35MHz to 3.15MHz), enabling EMI reduction in noise-sensitive systems. Synchronization engages within 2–3 cycles of the external clock signal, and the device automatically reverts to internal frequency if the external clock stops.
How does the MODE/SYNC pin configure operating modes on the LTC3621EDCB-2#TRPBF?
The MODE/SYNC pin on the LTC3621EDCB-2#TRPBF selects among three key modes: tie to INTVCC for Burst Mode (3.5µA IQ, 400mA clamp), ground for pulse-skipping (lowest VOUT ripple), or apply 1.0V–VINTVCC−1.2V for forced continuous conduction (supports zero-load operation). It also accepts external clock signals for synchronization.
What is the guaranteed output voltage accuracy of the LTC3621EDCB-2#TRPBF over temperature?
The LTC3621EDCB-2#TRPBF guarantees ±1% output voltage accuracy over its full operating junction temperature range of –40°C to 125°C, referenced to its internal 0.6V feedback voltage. This specification includes line, load, and temperature effects - critical for powering precision analog circuits and logic rails without post-regulation.
Does the LTC3621EDCB-2#TRPBF include built-in protection features?
Yes, the LTC3621EDCB-2#TRPBF integrates overtemperature protection (shuts down above ~150°C), VIN overvoltage lockout (19V trip, 18.7V release), VIN undervoltage lockout (2.7V), and reverse-current protection. These features operate autonomously without external components, safeguarding both the IC and downstream circuitry during fault conditions.
What package type and thermal characteristics apply to the LTC3621EDCB-2#TRPBF?
The LTC3621EDCB-2#TRPBF uses a 6-lead (2mm × 3mm) Plastic DFN package with an exposed GND pad (Pin 7). Its thermal resistance is θJA = 64°C/W and θJC = 9.6°C/W. The exposed pad must be soldered to a ≥25mm² PCB copper area for reliable thermal performance and EMI suppression.
LTC3621EDCB-2#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 17V
- 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)
LTC3621EDCB-2#TRPBF FAQ
1.How can I place an order for LTC3621EDCB-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EDCB-2#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-2#TRPBF reliable?
The price and inventory of LTC3621EDCB-2#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-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EDCB-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EDCB-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EDCB-2#TRPBF?
LTC3621EDCB-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EDCB-2#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-2#TRPBF?
For technical support, including LTC3621EDCB-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EDCB-2#TRPBF requirements.
6.How does Aetrix verify that LTC3621EDCB-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EDCB-2#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-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EDCB-2#TRPBF?
All LTC3621EDCB-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EDCB-2#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-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621EDCB-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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