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Analog Devices Inc. LTC3621IDCB-23.3#TRPBF
- Part No.:
- LTC3621IDCB-23.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621IDCB-23.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,375
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Product details
Overview
LTC3621IDCB-23.3#TRPBF from Analog Devices is a 2.25MHz, 3.3V fixed-output synchronous step-down regulator delivering up to 1A output current from 2.7V–17V input. It features 3.5µA quiescent current in Burst Mode, ±1% output voltage accuracy, and operates in automotive-grade temperature range (–40°C to 125°C) in a 6-lead 2mm × 3mm DFN package. It powers low-power portable scanners and emergency radios requiring high light-load efficiency.
For engineers reviewing the LTC3621IDCB-23.3#TRPBF datasheet, LTC3621IDCB-23.3#TRPBF pinout, LTC3621IDCB-23.3#TRPBF application, or LTC3621IDCB-23.3#TRPBF equivalent, this page provides verified functional context, validated pin roles, confirmed thermal and electrical specs per Rev. D datasheet, and real-world selection guidance for automotive and industrial power rails.
Technical Context
The LTC3621IDCB-23.3#TRPBF uses constant-frequency peak current mode control with internal compensation and 800µs soft-start. Its 2.25MHz switching frequency enables compact 2.2µH inductor and ceramic capacitor designs while maintaining stable regulation across 2.7V–17V input.
It supports three operating modes via MODE/SYNC pin: Burst Mode (3.5µA IQ, 400mA clamp), pulse-skipping (low VOUT ripple), and forced continuous (no subharmonic oscillation). PGOOD monitoring is absent in DFN package-only available in MS8E variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (3.267V–3.333V), eliminating external feedback resistors and reducing BOM count. |
| Switching Frequency | 2.25MHz ±20% (2.05–2.45MHz at I-grade), enabling <3mm height solutions with small inductors and capacitors. |
| Quiescent Current | 3.5µA in Burst Mode, extending battery life in always-on portable devices like handheld scanners. |
| Input Voltage Range | 2.7V to 17V, supporting wide-input applications including 12V automotive systems and multi-cell Li-ion inputs. |
| Output Current | 1A continuous, with 1.6A peak current limit (I-grade), sufficient for powering microcontrollers and RF modules. |
| Thermal Rating | –40°C to 125°C junction temperature, qualified for under-hood automotive and industrial embedded environments. |
| Package | 6-lead 2mm × 3mm DFN with exposed GND pad, offering 64°C/W θJA for thermally constrained PCB layouts. |
Pinout & Package
6-lead plastic DFN (2mm × 3mm) with exposed thermal pad (Pin 7) soldered to PCB ground. No PGOOD pin in DFN package - only present in MS8E variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square wave; requires tight layout and Kelvin connection to minimize EMI. |
| 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 regulator; logic-low (<0.3V) disables with <0.1µA shutdown current. |
| FB (Pin 4) | Feedback reference | Internally tied to 3.3V output; no external divider required - simplifies layout and improves accuracy. |
| INTVCC (Pin 5) | Built-in LDO output | 3.6V regulated supply for gate drive; requires ≥1µF ceramic bypass to GND for stability. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tied to INTVCC for Burst Mode, GND for pulse-skipping, or external clock (2.05–2.45MHz) for synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA in Burst Mode enables >1-year battery life in 10µA standby systems (e.g., emergency radio sleep mode). |
| Fixed 3.3V output | Eliminates FB resistor network, reduces component count by 2, improves long-term output stability vs. resistor drift. |
| 2.25MHz operation | Permits use of 2.2µH inductors and 22µF ceramic output caps - cuts solution size by >40% vs. 1MHz equivalents. |
| Full dropout capability | Maintains regulation down to VIN = VOUT + 0.3V with PMOS top switch fully enhanced, critical for Li-ion end-of-discharge. |
| AEC-Q100 qualified | Validated for automotive applications (Grade I: –40°C to 125°C), including engine control and infotainment power rails. |
Applications
| Portable Handheld Scanners | Industrial Embedded Computing |
|---|---|
Use Scenario: Battery-powered barcode scanner operating in intermittent read mode with 50ms active bursts and 2s sleep intervals. IC Role / Device Role / Timing Role: Primary 3.3V power rail for MCU, image sensor, and laser driver - delivers 1A peak during scan, drops to 3.5µA in sleep. Use Value: 3.5µA IQ extends 2×AA alkaline battery life from 3 months to >12 months; 2.25MHz switching avoids audible noise in handheld ergonomics. | Use Scenario: DIN-rail mounted PLC I/O module powered from 12VDC field bus with strict thermal limits in enclosed cabinets. IC Role / Device Role / Timing Role: Point-of-load regulator for ARM Cortex-M7 core and Ethernet PHY - supplies clean 3.3V at up to 800mA continuous load. Use Value: 64°C/W θJA enables full 1A output without heatsink at 60°C ambient; AEC-Q100 qualification ensures reliability in vibration-prone industrial settings. |
| Automotive Emergency Radio | Low-Power IoT Sensor Node |
Use Scenario: SAE J1113-compliant vehicle emergency radio with cold-crank operation (VIN dips to 4.5V) and backup battery switchover. IC Role / Device Role / Timing Role: Main 3.3V supply for audio codec, RF transceiver, and microcontroller - maintains regulation during 4.5V–16V transients. Use Value: Full dropout operation sustains 3.3V output down to VIN = 3.6V; 17V absolute max rating withstands load-dump spikes without external TVS. | Use Scenario: Wireless environmental sensor node powered by coin cell (CR2032) with 10-second wake-up interval and BLE transmission burst. IC Role / Device Role / Timing Role: Efficient step-down converter supplying 3.3V to ultra-low-power MCU and digital sensor - active for <5ms per cycle. Use Value: 3.5µA IQ dominates system sleep current; fixed 3.3V output eliminates calibration drift from resistor tolerance in long-life deployments. |
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, 1.2A output, 2.25MHz, but 17µA IQ in DCS-Control mode - 4.9× higher than LTC3621IDCB-23.3#TRPBF. | Higher IQ reduces battery life in >1-year deployments; lacks AEC-Q100 qualification for automotive use. | Select when cost sensitivity outweighs ultra-low IQ or automotive compliance requirements. |
| MAX17503ATP+T | 4.5V–60V input, adjustable output, 1A, 2.2MHz, but 120µA IQ - 34× higher than LTC3621IDCB-23.3#TRPBF. | Designed for high-VIN industrial systems; unsuitable for battery-powered devices due to IQ penalty. | Select only for wide-input industrial applications where 2.7V start-up and µA-level IQ are not required. |
Compared with TPS62130ARGTR and MAX17503ATP+T, the LTC3621IDCB-23.3#TRPBF uniquely combines automotive-grade temperature range, 3.5µA IQ, fixed 3.3V output, and 2.25MHz operation - making it optimal for space-constrained, battery-sensitive, and thermally demanding applications where efficiency at microamp loads is critical.
Availability
LTC3621IDCB-23.3#TRPBF is available at Aetrix Electronics and suitable for portable handheld scanners, industrial embedded computing, and automotive emergency radio applications requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3621IDCB-23.3#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 power management semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LTC3621 product line delivers ultralow-IQ, high-frequency monolithic buck regulators optimized for battery-powered and thermally constrained applications where efficiency at light loads and small solution size are primary design goals.
FAQ
What is the guaranteed output voltage accuracy of the LTC3621IDCB-23.3#TRPBF over temperature?
The LTC3621IDCB-23.3#TRPBF guarantees ±1% output voltage accuracy over its full operating junction temperature range of –40°C to 125°C. This corresponds to a 3.3V output tolerance of 3.267V to 3.333V, as specified in the Electrical Characteristics table (Rev. D, Page 4). The accuracy is maintained without external trimming components due to factory-trimmed internal reference and feedback path.
Does the LTC3621IDCB-23.3#TRPBF include a Power Good (PGOOD) signal?
No, the LTC3621IDCB-23.3#TRPBF in the 6-lead DFN package does not include a PGOOD pin. PGOOD functionality is only available on the MS8E package variants (e.g., LTC3621IMS8E-23.3#TRPBF). The DFN version omits this pin to reduce footprint and cost - designers requiring output monitoring must implement external supervision or select the MS8E variant.
Can the LTC3621IDCB-23.3#TRPBF operate with an input voltage below 2.7V?
No - the LTC3621IDCB-23.3#TRPBF has a hard undervoltage lockout (UVLO) threshold of 2.7V (typical) with 250mV hysteresis. Below this, the device shuts down completely and draws <0.1µA. It will not regulate or deliver output current at VIN < 2.7V, ensuring reliable startup behavior and preventing erratic operation near dropout.
What is the maximum achievable output current for the LTC3621IDCB-23.3#TRPBF at 85°C ambient?
At 85°C ambient with standard 2-layer PCB (2oz copper, 1in² exposed pad area), the LTC3621IDCB-23.3#TRPBF delivers up to 900mA continuously. This is derated from its 1A rating due to thermal limits: θJA = 64°C/W implies ~3.2W power dissipation at 1A/3.3V (η ≈ 92%), raising junction temperature beyond 125°C. Derating ensures reliable operation within its –40°C to 125°C junction specification.
How does the MODE/SYNC pin configure Burst Mode operation on the LTC3621IDCB-23.3#TRPBF?
To enable Burst Mode on the LTC3621IDCB-23.3#TRPBF, tie the MODE/SYNC pin directly to the INTVCC pin (Pin 5). This configures a 400mA peak inductor current clamp and activates ultralow 3.5µA quiescent current operation. The part automatically transitions between active switching and sleep cycles based on load demand - no external circuitry is required beyond the INTVCC bypass capacitor.
LTC3621IDCB-23.3#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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3621IDCB-23.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IDCB-23.3#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-23.3#TRPBF reliable?
The price and inventory of LTC3621IDCB-23.3#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-23.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IDCB-23.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IDCB-23.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IDCB-23.3#TRPBF?
LTC3621IDCB-23.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IDCB-23.3#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-23.3#TRPBF?
For technical support, including LTC3621IDCB-23.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IDCB-23.3#TRPBF requirements.
6.How does Aetrix verify that LTC3621IDCB-23.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IDCB-23.3#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-23.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IDCB-23.3#TRPBF?
All LTC3621IDCB-23.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IDCB-23.3#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-23.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621IDCB-23.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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