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Analog Devices Inc. LTC3621EDCB-23.3#TRMPBF
- Part No.:
- LTC3621EDCB-23.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621EDCB-23.3#TRMPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,095
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Product details
Overview
LTC3621EDCB-23.3#TRMPBF from Analog Devices is a 2.25MHz, 3.3V 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 Burst Mode™, pulse-skipping, and forced continuous operation, and is used in portable handheld scanners and automotive emergency radio power supplies.
For engineers reviewing the LTC3621EDCB-23.3#TRMPBF datasheet, LTC3621EDCB-23.3#TRMPBF pinout, LTC3621EDCB-23.3#TRMPBF application, or LTC3621EDCB-23.3#TRMPBF equivalent, key selection criteria include ultralow IQ for battery longevity, 2.25MHz switching for compact filter design, fixed 3.3V output with no external feedback resistors, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3621EDCB-23.3#TRMPBF implements a constant-frequency peak current mode control architecture with internal compensation and 800µs soft-start. Its MODE/SYNC pin enables dynamic selection among Burst Mode™ (3.5µA IQ), pulse-skipping (low VOUT ripple), or forced continuous operation (stable frequency under all loads).
It integrates PMOS high-side and NMOS low-side power switches with RDS(ON) of 0.37Ω and 0.15Ω respectively, supports full dropout operation down to VIN ≈ VOUT, and features integrated overtemperature protection and VIN overvoltage lockout at 19V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% - eliminates need for external feedback divider and ensures stable rail for MCU I/O or RF front-end biasing. |
| Switching Frequency | 2.25MHz ±20% - enables use of sub-3mm inductors and reduces output capacitor size for space-constrained portable designs. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on emergency radios and handheld scanners operating at light load. |
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial 12V rails and automotive cold-crank (6V) to load-dump (16V) conditions. |
| Output Current | 1A continuous - sufficient to power ARM Cortex-M4 microcontrollers, CAN transceivers, and small LCD displays simultaneously. |
| Thermal Performance | θJA = 64°C/W in DFN package - allows 1A operation at TA ≤ 85°C without heatsink in typical 2-layer PCB layouts. |
| Protection Features | Overtemperature shutdown, VIN OVP (19V), and internal soft-start - prevents inrush damage and ensures robust startup under varying input conditions. |
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 connection | Drives external inductor; requires low-inductance layout to minimize EMI and switching losses. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; must be bypassed with ≥10µF ceramic capacitor placed adjacent to pin. |
| RUN (Pin 3) | Enable control input | Logic-high (>1.0V) enables regulation; tied low disables output and reduces IQ to 0.1µA. |
| FB (Pin 4) | Feedback reference point | Internally connected to 3.3V output; no external resistor network required for fixed-output configuration. |
| MODE/SYNC (Pin 6) | Operating mode selector | Tied to INTVCC for Burst Mode, grounded for pulse-skipping, or driven by external clock for synchronization. |
| GND (Exposed Pad) | Power and signal ground | Mandatory solder connection to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ Operation | Reduces IQ to 3.5µA at light load while maintaining regulation-critical for multi-year battery life in emergency devices. |
| 2.25MHz Fixed Switching | Enables use of 2.2µH inductors and 22µF ceramic output capacitors-reducing solution footprint by >40% vs. 1MHz alternatives. |
| Integrated Power Switches | 0.37Ω PMOS high-side + 0.15Ω NMOS low-side - delivers >92% efficiency at 500mA/3.3V from 12V input without external FETs. |
| AEC-Q100 Qualified | Rated for automotive temperature range (–40°C to 125°C) and stress-tested per automotive reliability standards. |
| Internal Soft-Start | 800µs monotonic ramp prevents output overshoot and inrush current during power-up-eliminates need for external timing components. |
Applications
| Portable Handheld Scanners | Automotive Emergency Radio |
|---|---|
Use Scenario: Battery-powered barcode scanner requiring always-on wake-up capability and 3.3V rail for CMOS image sensor and BLE SoC. IC Role / Device Role / Timing Role: Primary DC/DC converter generating clean, regulated 3.3V from single-cell Li-ion (3.0–4.2V) or 9V alkaline stack. Use Value: 3.5µA quiescent current extends shelf life beyond 5 years; 2.25MHz switching minimizes inductor height for slim form factor. | Use Scenario: In-vehicle emergency communication radio operating across automotive battery range (6V–16V) with cold-crank tolerance. IC Role / Device Role / Timing Role: Main 3.3V supply for RF transceiver, microcontroller, and audio codec in safety-critical system. Use Value: AEC-Q100 qualification ensures reliability under vibration and thermal cycling; 17V absolute max rating withstands load-dump transients. |
| Industrial Embedded Computing | Low-Power IoT Sensor Node |
Use Scenario: Fanless edge controller powered from 12V PoE or DIN-rail supply, requiring quiet, efficient 3.3V for ARM-based SoM. IC Role / Device Role / Timing Role: High-efficiency buck regulator supporting dynamic voltage scaling and deep-sleep states. Use Value: Pulse-skipping mode provides <15mVpp output ripple for analog sensor interfaces; RUN pin enables firmware-controlled power gating. | Use Scenario: Solar-charged environmental sensor node transmitting data hourly via LoRaWAN, operating intermittently for >10 years. IC Role / Device Role / Timing Role: Ultra-low-IQ power source enabling energy harvesting compatibility and extended sleep cycles. Use Value: Zero-current shutdown (0.1µA) preserves stored energy between transmissions; fixed 3.3V output simplifies BOM and layout. |
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, 3MHz switching, 17µA IQ in PFM mode | Higher IQ limits battery runtime; no AEC-Q100 grade available | Select when board space is more constrained than power budget, and automotive qualification is not required. |
| MAX17504ATP+T | 4.5V–60V input, adjustable output, 2.2MHz, 100µA IQ, external MOSFETs | Requires external FETs and compensation; higher BOM cost and layout complexity | Select for high-input-voltage industrial systems where 17V max input is insufficient. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3621EDCB-23.3#TRMPBF uniquely combines automotive qualification, sub-4µA quiescent current, and monolithic 1A integration in a 2mm×3mm DFN-making it optimal for space- and battery-limited safety-critical applications.
Availability
LTC3621EDCB-23.3#TRMPBF is available at Aetrix Electronics and suitable for portable handheld scanners, automotive emergency radio, and industrial embedded computing requiring stable component supply with long-term lifecycle support.
Supply support for LTC3621EDCB-23.3#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, and automotive markets.
The LTC3621 product line delivers ultralow-quiescent-current synchronous buck regulators for battery-powered and automotive applications where efficiency, small size, and reliability are critical.
FAQ
What is the guaranteed output voltage accuracy of the LTC3621EDCB-23.3#TRMPBF?
The LTC3621EDCB-23.3#TRMPBF guarantees ±1% output voltage accuracy over temperature (–40°C to 125°C), line, and load conditions. This is achieved via a precision 0.6V internal reference and trimmed feedback path, ensuring stable 3.3V operation for sensitive digital logic and analog circuitry without external calibration. The LTC3621EDCB-23.3#TRMPBF achieves this accuracy across its full 2.7V–17V input range and 0–1A load range.
Can the LTC3621EDCB-23.3#TRMPBF be synchronized to an external clock?
Yes, the LTC3621EDCB-23.3#TRMPBF supports external clock synchronization via its MODE/SYNC pin, with a capture range of ±40% around its nominal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz). When synchronized, the device operates in forced continuous mode and locks to the external clock within 2–3 cycles. The LTC3621EDCB-23.3#TRMPBF maintains tight frequency stability and phase coherence, making it suitable for noise-sensitive systems like RF receivers or time-critical industrial controllers.
Does the LTC3621EDCB-23.3#TRMPBF require external compensation components?
No, the LTC3621EDCB-23.3#TRMPBF features fully internal compensation, eliminating the need for external RC networks or type-II/type-III compensators. Its current-mode architecture with built-in slope compensation ensures stable loop response across all operating conditions-including dropout and light-load modes. This simplifies design, reduces BOM count, and improves repeatability. The LTC3621EDCB-23.3#TRMPBF is optimized for standard 2.2µH inductors and 22µF ceramic output capacitors without tuning.
What protection features are integrated into the LTC3621EDCB-23.3#TRMPBF?
The LTC3621EDCB-23.3#TRMPBF integrates overtemperature shutdown, VIN overvoltage lockout (19V trip, 18.7V release), undervoltage lockout (2.7V), and cycle-by-cycle current limiting (1.6A typical). It also includes reverse-current protection and soft-start to prevent inrush damage. These protections operate autonomously without external components. The LTC3621EDCB-23.3#TRMPBF maintains safe operation during automotive load-dump events, thermal overload, and cold-crank brownouts.
Is the LTC3621EDCB-23.3#TRMPBF pin-compatible with other variants in the LTC3621 family?
Yes, the LTC3621EDCB-23.3#TRMPBF shares identical 6-lead DFN (2mm × 3mm) pinout and footprint with all LTC3621EDCB-x variants-including LTC3621EDCB-2, LTC3621EDCB-25, and adjustable versions. This enables drop-in replacement across output voltages and frequencies without PCB revision. The LTC3621EDCB-23.3#TRMPBF uses the same SW/VIN/RUN/FB/MODE/SYNC/GND pin assignments, allowing flexible BOM management and design reuse in multi-voltage platforms.
LTC3621EDCB-23.3#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:
- 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-23.3#TRMPBF FAQ
1.How can I place an order for LTC3621EDCB-23.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EDCB-23.3#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 LTC3621EDCB-23.3#TRMPBF reliable?
The price and inventory of LTC3621EDCB-23.3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621EDCB-23.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EDCB-23.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EDCB-23.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EDCB-23.3#TRMPBF?
LTC3621EDCB-23.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EDCB-23.3#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 LTC3621EDCB-23.3#TRMPBF?
For technical support, including LTC3621EDCB-23.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EDCB-23.3#TRMPBF requirements.
6.How does Aetrix verify that LTC3621EDCB-23.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EDCB-23.3#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 LTC3621EDCB-23.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EDCB-23.3#TRMPBF?
All LTC3621EDCB-23.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EDCB-23.3#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 LTC3621EDCB-23.3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621EDCB-23.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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