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Analog Devices Inc. LTC3621IDCB-23.3#TRMPBF
- Part No.:
- LTC3621IDCB-23.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621IDCB-23.3#TRMPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,725
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Product details
Overview
LTC3621IDCB-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 full dropout operation, and integrates internal compensation and soft-start. It is used in automotive emergency radios requiring ultra-low IQ and stable 3.3V rail generation under wide VIN transients.
For engineers reviewing the LTC3621IDCB-23.3#TRMPBF datasheet, LTC3621IDCB-23.3#TRMPBF pinout, LTC3621IDCB-23.3#TRMPBF application, or LTC3621IDCB-23.3#TRMPBF equivalent, this page delivers verified technical context, exact pin functions, confirmed efficiency curves at 2.25MHz/3.3V, real-world load-step behavior, and validated alternative options for automotive-grade 3.3V point-of-load regulation.
Technical Context
The LTC3621IDCB-23.3#TRMPBF implements a constant-frequency peak current mode control architecture with 2.25MHz switching and ±40% external synchronization capability. Its internal 0.6V reference and fixed 3.3V output eliminate external feedback resistors while maintaining ±1% accuracy over –40°C to 125°C.
It features three selectable operating modes via the MODE/SYNC pin: Burst Mode (3.5µA IQ), pulse-skipping (low ripple), and forced continuous (stable frequency). Integrated overtemperature protection, VIN overvoltage lockout (19V trip), and undervoltage lockout (2.7V) enable robust operation in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V with ±1% accuracy (3.267V–3.333V) - eliminates external resistor divider and ensures precise MCU/core logic rail compliance. |
| Switching Frequency | 2.25MHz (±10%) - enables use of compact 2.2µH inductors and reduces EMI filtering burden in space-constrained automotive modules. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on emergency radio standby without compromising wake-up response. |
| Input Voltage Range | 2.7V to 17V - supports cold-crank (4.5V) and load-dump (16V) conditions per ISO 16750-2 without external protection circuitry. |
| Output Current | 1A continuous - powers ARM Cortex-M7 microcontrollers, CAN transceivers, and RF front-ends simultaneously in portable scanners. |
| Thermal Performance | θJA = 64°C/W (DFN 2mm×3mm) - sustains 1A output at TA = 85°C with minimal PCB copper area, verified per JEDEC JESD51-7. |
| Protection Features | VIN OVP (19V), UVLO (2.7V), overtemperature shutdown - provides autonomous fault recovery without host intervention in unattended systems. |
Pinout & Package
Package: 6-Lead DFN (2mm × 3mm), exposed thermal pad (Pin 7) soldered to PCB ground. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects directly to inductor; carries high di/dt square wave - requires tight layout with low-inductance path to minimize EMI and voltage spikes. |
| VIN (Pin 2) | Input supply | Accepts 2.7V–17V; feeds internal LDO (INTVCC) and power switches - must be bypassed with ≥10µF ceramic capacitor placed adjacent to pin. |
| RUN (Pin 3) | Enable control | Active-high logic input; <0.3V disables regulator, >1.0V enables - pulled high via 100kΩ resistor for default-on operation in automotive modules. |
| FB (Pin 4) | Feedback input | Internally tied to 3.3V output - no external divider required; floating or misconnected FB causes regulation failure. |
| INTVCC (Pin 5) | Bias LDO output | 3.6V regulated supply for gate drivers and internal circuits - requires ≥1µF ceramic bypass to GND, placed within 2mm of pin. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tied to INTVCC for Burst Mode (3.5µA IQ), GND for pulse-skipping (low ripple), or external clock for synchronization - critical for EMI coexistence in multi-rail systems. |
| GND (Exposed Pad) | Power & signal ground | Thermal and electrical reference plane - must be soldered to ≥200mm² solid PCB ground plane for thermal reliability and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA in Burst Mode enables >1-year battery life in emergency radios with 200mAh Li-ion cells during standby. |
| Fixed 3.3V output | Eliminates external resistor network, reducing BOM count by 2 components and improving long-term voltage stability vs. temperature drift. |
| 2.25MHz switching | Permits use of 2.2µH shielded inductors ≤2.5mm height - essential for ultra-thin handheld scanner PCBs with <1.6mm profile constraints. |
| Full dropout operation | Maintains regulation down to VIN = VOUT + 0.1V (e.g., 3.4V input → 3.3V out), enabling seamless transition during automotive cold-crank events. |
| Integrated soft-start | 800µs internal ramp prevents inrush current into downstream capacitors - avoids brownout on shared 3.3V bus during power-up sequencing. |
| AEC-Q100 qualified | Rated for –40°C to 125°C junction temperature - certified for automotive body electronics per stress test requirements including HTOL and TC022. |
Applications
| Portable Emergency Radio | Automotive Body Control Module |
|---|---|
|
Use Scenario: Battery-powered handheld radio operating from single-cell Li-ion (3.0–4.2V) with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator supplying MCU, audio codec, and sub-GHz RF transceiver. Use Value: 3.5µA quiescent current extends shelf life beyond 10 years; 2.25MHz switching minimizes inductor size for <12mm³ volume constraint. |
Use Scenario: Door module powering window motor driver, LED status indicators, and LIN transceiver from 12V battery. IC Role / Device Role / Timing Role: Secondary 3.3V rail generator isolated from noisy 12V domain via integrated high-side PMOS switch. Use Value: 17V absolute max rating withstands ISO 16750-2 load dump (16V/1s); ±1% accuracy ensures reliable LIN physical layer timing. |
| Industrial Handheld Scanner | Embedded Computing Subsystem |
|
Use Scenario: Rugged barcode scanner with ARM-based SoC, CMOS imager, and USB interface operating across –20°C to 60°C ambient. IC Role / Device Role / Timing Role: Core logic voltage regulator delivering clean 3.3V to processor I/O banks and camera interface. Use Value: Pulse-skipping mode reduces output ripple to <15mVpp at 10mA load - prevents image sensor noise coupling into analog pixel data path. |
Use Scenario: Fanless edge gateway with dual-core Cortex-A53, eMMC storage, and Wi-Fi/BT combo chip in sealed enclosure. IC Role / Device Role / Timing Role: Dedicated 3.3V supply for SDIO interface and USB PHY, decoupled from main 5V rail. Use Value: Forced continuous mode eliminates frequency modulation artifacts - ensures jitter <1ns RMS on SDIO clock signals for error-free eMMC UHS-I operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.3V fixed, 3MHz, 2.5µA IQ, but only rated to 12V VIN and lacks AEC-Q100 qualification. | Suitable for consumer portables but not automotive due to lower VIN rating and missing automotive reliability testing. | Select when cost sensitivity outweighs automotive qualification needs and input never exceeds 12V. |
| MAX20004AATP+T | 3.3V fixed, 2.2MHz, 2.5µA IQ, AEC-Q100 Grade 1 (–40°C to +125°C), but requires external compensation. | Supports same automotive temp range but adds design complexity with external RC network for loop stability. | Select when board area allows extra 2 passive components and tighter EMI control via adjustable compensation is prioritized. |
Compared with TPS62130ARGTR and MAX20004AATP+T, the LTC3621IDCB-23.3#TRMPBF uniquely combines 17V VIN tolerance, AEC-Q100 qualification, and zero-component fixed 3.3V output - eliminating both external feedback and derating concerns in harsh automotive environments.
Availability
LTC3621IDCB-23.3#TRMPBF is available at Aetrix Electronics and suitable for automotive emergency radios, industrial handheld scanners, embedded computing subsystems, and body control modules requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3621IDCB-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 (now part of Analog Devices, Inc.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3621 product line delivers ultralow-IQ synchronous buck regulators optimized for battery-powered and automotive applications where extended standby life and robust transient performance are mandatory.
FAQ
What is the maximum input voltage rating for the LTC3621IDCB-23.3#TRMPBF?
The LTC3621IDCB-23.3#TRMPBF has an absolute maximum input voltage rating of 17V. It also includes built-in VIN overvoltage protection that suspends operation above 19V and resumes at 18.7V, ensuring safe operation during automotive load-dump events per ISO 16750-2. This makes the LTC3621IDCB-23.3#TRMPBF suitable for direct connection to 12V vehicle batteries without external clamping.
Does the LTC3621IDCB-23.3#TRMPBF require external feedback resistors to set the output voltage?
No, the LTC3621IDCB-23.3#TRMPBF is a fixed 3.3V output variant - the feedback pin (FB) is internally connected to the output, eliminating the need for external resistors. This simplifies layout, improves long-term accuracy by removing resistor drift, and reduces BOM count. Connecting external components to FB on the LTC3621IDCB-23.3#TRMPBF will disrupt regulation and is not supported.
How does the MODE/SYNC pin function on the LTC3621IDCB-23.3#TRMPBF?
The MODE/SYNC pin on the LTC3621IDCB-23.3#TRMPBF selects operating mode: tie to INTVCC for Burst Mode (3.5µA IQ), ground for pulse-skipping (lowest ripple), or apply external clock for synchronization. In sync mode, it forces continuous conduction and locks to the external frequency within ±40% of 2.25MHz. This pin directly controls trade-offs between efficiency, noise, and EMI in the final system design.
Is the LTC3621IDCB-23.3#TRMPBF qualified for automotive applications?
Yes, the LTC3621IDCB-23.3#TRMPBF is AEC-Q100 qualified for automotive applications and rated for operation from –40°C to +125°C junction temperature. It undergoes stress testing including HTOL, temperature cycling, and ESD per AEC-Q100 Rev H, making it suitable for body electronics, infotainment, and ADAS subsystems where reliability under thermal and electrical stress is critical.
What package type and thermal characteristics does the LTC3621IDCB-23.3#TRMPBF use?
The LTC3621IDCB-23.3#TRMPBF uses a 6-lead 2mm × 3mm DFN package with exposed thermal 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 minimum 200mm² PCB ground plane to achieve rated 1A output at 85°C ambient - verified per JEDEC JESD51-7 standard testing conditions.
LTC3621IDCB-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)
LTC3621IDCB-23.3#TRMPBF FAQ
1.How can I place an order for LTC3621IDCB-23.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IDCB-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 LTC3621IDCB-23.3#TRMPBF reliable?
The price and inventory of LTC3621IDCB-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 LTC3621IDCB-23.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IDCB-23.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IDCB-23.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IDCB-23.3#TRMPBF?
LTC3621IDCB-23.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IDCB-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 LTC3621IDCB-23.3#TRMPBF?
For technical support, including LTC3621IDCB-23.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IDCB-23.3#TRMPBF requirements.
6.How does Aetrix verify that LTC3621IDCB-23.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IDCB-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 LTC3621IDCB-23.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IDCB-23.3#TRMPBF?
All LTC3621IDCB-23.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IDCB-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 LTC3621IDCB-23.3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621IDCB-23.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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