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Analog Devices Inc. LTC3621IDCB-2#TRPBF
- Part No.:
- LTC3621IDCB-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621IDCB-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,186
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Product details
Overview
LTC3621IDCB-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. It delivers adjustable output from 0.6V to VIN, achieves ≤3.5µA quiescent current in shutdown, and maintains ±1% output voltage accuracy across –40°C to 125°C. It is used in space-constrained automotive and portable industrial power rails requiring low-noise, high-efficiency DC/DC conversion.
For engineers reviewing the LTC3621IDCB-2#TRPBF datasheet, LTC3621IDCB-2#TRPBF pinout, LTC3621IDCB-2#TRPBF application, or LTC3621IDCB-2#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support for production-grade deployment.
Technical Context
The LTC3621IDCB-2#TRPBF uses constant-frequency peak current mode control with internal compensation and an 800µs soft-start ramp. Its 2.25MHz fixed oscillator enables compact filter design using small inductors (e.g., 2.2µH) and ceramic capacitors while maintaining stability across 2.7V–17V input and 0.6V–VIN output ranges.
It supports three operational modes via the MODE/SYNC pin: Burst Mode (≤3.5µA IQ, 400mA clamp), pulse-skipping (low VOUT ripple), and forced continuous (cycle-by-cycle switching). Overtemperature protection, VIN overvoltage lockout (19V trip), and undervoltage lockout (2.7V) are integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery rails without pre-regulation. |
| Output Current | Up to 1A - sufficient for powering microcontrollers, sensors, and RF modules in embedded systems. |
| Switching Frequency | 2.25MHz (±40% sync range) - enables use of sub-3mm inductors and reduces EMI filtering footprint. |
| Quiescent Current | ≤3.5µA in shutdown - extends battery life in always-on portable devices like emergency radios. |
| Feedback Voltage | 0.6V ±1% - enables precise, stable output regulation with external resistor divider tuning. |
| Operating Temp Range | –40°C to 125°C - qualified for under-hood automotive and industrial edge computing environments. |
| Package | 6-lead DFN (2mm × 3mm) with exposed GND pad - provides low thermal resistance (θJC = 9.6°C/W) for high-power density layouts. |
Pinout & Package
6-lead DFN (2mm × 3mm) package with exposed thermal pad (Pin 7) soldered to PCB ground for optimal thermal performance and EMI reduction.
| 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; powers internal LDO (INTVCC) and gate drivers - requires local 10µF ceramic bypass. |
| RUN (Pin 3) | Enable control | Active-high logic input; pulling low disables regulator and reduces IQ to ≤0.1µA - used for system-level power sequencing. |
| FB (Pin 4) | Feedback sense | Monitors resistive divider output; regulates VOUT to 0.6V reference - sets output voltage as VOUT = 0.6V × (1 + R2/R1). |
| INTVCC (Pin 5) | Internal LDO output | 3.6V regulated supply for internal circuitry - must be bypassed with ≥1µF ceramic capacitor to GND. |
| MODE/SYNC (Pin 6) | Mode selection & clock sync | Selects Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous (1V–2.4V); accepts external clock up to ±40% of 2.25MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to ≤3.5µA at light loads while maintaining regulation - critical for battery-powered handheld scanners. |
| 2.25MHz fixed-frequency switching | Enables use of 2.2µH inductors and 22µF ceramic output caps - cuts solution size by >40% vs 1MHz equivalents. |
| Internal soft-start (800µs) | Prevents inrush current and output overshoot during startup - eliminates need for external timing components. |
| Overtemperature & OVP protection | Shuts down safely at TJ > 150°C or VIN > 19V - protects downstream circuitry in fault conditions without external supervision. |
| Adjustable VOUT (0.6V–VIN) | Supports core voltages for ARM Cortex-M, DSPs, and FPGAs via simple resistor divider - no fixed-output variants required. |
Applications
| Automotive Infotainment Power Rail | Industrial IoT Sensor Node |
|---|---|
|
Use Scenario: Powers display controller and audio codec in vehicle head unit with 12V battery input and 3.3V/1.8V outputs. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 3.3V at up to 1A with minimal board area. Use Value: 2.25MHz operation avoids AM radio band interference; ±1% accuracy ensures reliable MCU boot and ADC reference stability. |
Use Scenario: Supplies 1.2V core and 3.3V I/O to ultra-low-power wireless sensor node powered by Li-SOCl₂ battery. IC Role / Device Role / Timing Role: High-efficiency step-down regulator enabling multi-year battery life via ≤3.5µA shutdown IQ. Use Value: Burst Mode operation maintains >85% efficiency at 100µA load; wide VIN range accommodates battery discharge from 3.6V to 2.7V. |
| Portable Handheld Scanner | Emergency Radio Power Management |
|
Use Scenario: Powers CMOS image sensor, laser driver, and BLE SoC in barcode scanner with intermittent 5V USB or 3.7V Li-ion input. IC Role / Device Role / Timing Role: Single-chip DC/DC solution replacing discrete buck + LDO cascade. Use Value: Compact DFN package fits <100mm² PCB area; forced continuous mode eliminates audible noise during scanning bursts. |
Use Scenario: Regulates 9V alkaline or 12V solar input to stable 5V/3.3V for SDR receiver, microcontroller, and LCD display. IC Role / Device Role / Timing Role: Main power converter supporting cold-start capability down to 2.7V input. Use Value: Full dropout operation sustains output during battery sag; AEC-Q100 qualification ensures reliability in field-deployed units. |
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 | 3V–17V input, 3MHz switching, 1.2A output, 17µA IQ in PWM mode - higher light-load IQ than LTC3621IDCB-2#TRPBF's 3.5µA Burst Mode. | Targets cost-sensitive consumer electronics; lacks AEC-Q100 qualification and sync range flexibility. | Choose when 3MHz operation and higher output current are prioritized over ultra-low IQ and automotive compliance. |
| MP2315GJ-Z | 4.5V–28V input, 2MHz switching, 1.5A output, 26µA IQ - wider VIN but significantly higher quiescent current and no Burst Mode. | Suitable for industrial 24V rail applications; not rated for automotive temperature range or low-IQ battery use. | Choose for higher input voltage margin and higher output current where IQ < 10µA is not required. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621IDCB-2#TRPBF uniquely combines 2.25MHz operation, ≤3.5µA IQ, AEC-Q100 qualification, and ±40% sync range - making it optimal for space- and battery-constrained automotive and portable industrial designs where efficiency at microamp loads is critical.
Availability
LTC3621IDCB-2#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial IoT sensor nodes, and portable handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed AEC-Q100 compliance.
Supply support for LTC3621IDCB-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 industrial, automotive, communications, and healthcare markets.
The LTC3621 product line delivers ultralow-quiescent-current synchronous buck regulators optimized for battery-powered and automotive applications demanding high efficiency across wide load and input voltage ranges.
FAQ
What is the maximum input voltage rating for the LTC3621IDCB-2#TRPBF?
The LTC3621IDCB-2#TRPBF has an absolute maximum input voltage rating of 17V. Exceeding this voltage risks permanent damage. Its VIN overvoltage lockout activates at 19V (rising) with 300mV hysteresis, suspending switching until VIN drops below 18.7V. This protection safeguards internal PMOS/NMOS switches during transients.
Does the LTC3621IDCB-2#TRPBF support external frequency synchronization?
Yes, the LTC3621IDCB-2#TRPBF supports external clock synchronization via its MODE/SYNC pin. It locks to input clocks within ±40% of its nominal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz), entering forced continuous mode upon sync engagement. Sync acquisition takes 2–3 external clock cycles.
What is the purpose of the exposed pad on the LTC3621IDCB-2#TRPBF DFN package?
The exposed pad (Pin 7) on the LTC3621IDCB-2#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB copper pour to achieve θJC = 9.6°C/W and ensure safe thermal dissipation at full 1A load. Leaving it unconnected degrades thermal performance and may cause premature thermal shutdown.
How does the MODE/SYNC pin configure operating modes on the LTC3621IDCB-2#TRPBF?
The MODE/SYNC pin selects three modes: tie to INTVCC for Burst Mode (≤3.5µA IQ, 400mA clamp), tie to GND for pulse-skipping (lowest VOUT ripple), or apply 1.0V–2.4V for forced continuous mode. External clock input also forces continuous mode and synchronizes switching frequency.
Is the LTC3621IDCB-2#TRPBF qualified for automotive applications?
Yes, the LTC3621IDCB-2#TRPBF is AEC-Q100 qualified for automotive applications. Its –40°C to 125°C operating junction temperature range, integrated OVP/UVP, overtemperature protection, and robust DFN package meet automotive reliability requirements for infotainment and body electronics.
LTC3621IDCB-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)
LTC3621IDCB-2#TRPBF FAQ
1.How can I place an order for LTC3621IDCB-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IDCB-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 LTC3621IDCB-2#TRPBF reliable?
The price and inventory of LTC3621IDCB-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 LTC3621IDCB-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IDCB-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IDCB-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IDCB-2#TRPBF?
LTC3621IDCB-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IDCB-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 LTC3621IDCB-2#TRPBF?
For technical support, including LTC3621IDCB-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IDCB-2#TRPBF requirements.
6.How does Aetrix verify that LTC3621IDCB-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IDCB-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 LTC3621IDCB-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IDCB-2#TRPBF?
All LTC3621IDCB-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IDCB-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 LTC3621IDCB-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621IDCB-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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