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Analog Devices Inc. LTC3621EDCB-3.3#TRMPBF
- Part No.:
- LTC3621EDCB-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621EDCB-3.3#TRMPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
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Product details
Overview
LTC3621EDCB-3.3#TRMPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in a 6-lead DFN (2mm × 3mm) package, delivering a fixed 3.3V output with ±1% accuracy, 3.5µA quiescent current in shutdown, and 1MHz switching frequency. It operates across 2.7V–17V input range and supports automotive, portable scanner, and industrial embedded applications requiring ultra-low IQ and high efficiency at light loads.
For engineers reviewing the LTC3621EDCB-3.3#TRMPBF datasheet, LTC3621EDCB-3.3#TRMPBF pinout, LTC3621EDCB-3.3#TRMPBF application, or LTC3621EDCB-3.3#TRMPBF equivalent, key selection considerations include its fixed 3.3V output, Burst Mode® operation for <3.5µA IQ, 1MHz constant-frequency PWM, and compatibility with ceramic input/output capacitors in space-constrained designs.
Technical Context
The LTC3621EDCB-3.3#TRMPBF implements a peak current-mode control architecture with internal compensation and 800µs soft-start. Its fixed 3.3V output eliminates external feedback resistors, and the MODE/SYNC pin enables selection among Burst Mode® (ultra-low IQ), pulse-skipping (low ripple), or forced continuous mode (stable EMI profile).
It integrates both PMOS top and NMOS bottom power switches with RDS(ON) of 0.37Ω and 0.15Ω respectively, supports full dropout operation down to VIN = VOUT, and features VIN overvoltage lockout (19V trip) and thermal shutdown protection - all within a thermally enhanced DFN package with exposed GND pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% - eliminates need for external feedback divider; ensures stable rail for MCU I/O or logic interfaces. |
| Input Voltage Range | 2.7V to 17V - supports wide-input systems including 12V automotive, 5V USB-PD, and Li-ion battery-powered devices. |
| Quiescent Current | 3.5µA in Burst Mode® - extends battery life in always-on sensor nodes or emergency radios without compromising wake-up response. |
| Switching Frequency | 1MHz ±8% - enables compact 2.2µH inductors and low-profile ceramic capacitors; reduces EMI filtering burden. |
| Max Output Current | 1A continuous - sufficient for powering ARM Cortex-M microcontrollers, FPGA I/O banks, or RF transceivers. |
| Efficiency | Up to 95% at 1A - minimizes thermal dissipation in sealed enclosures; maintains >85% efficiency even at 10mA load in Burst Mode®. |
| Accuracy & Stability | ±1% output voltage tolerance, ±7.5% PGOOD window - ensures reliable system reset and brown-out detection in industrial controllers. |
Pinout & Package
Package: 6-Lead (2mm × 3mm) Plastic DFN with exposed GND pad (Pin 7), rated for –40°C to 125°C junction temperature. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high di/dt square wave - 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; requires local 10µF ceramic bypass. |
| RUN (Pin 3) | Enable control | Active-high logic input; pulling low disables regulator and reduces IQ to 0.1µA; must not float. |
| FB (Pin 4) | Feedback reference | Internally tied to 3.3V output - no external resistor network needed; simplifies layout and improves accuracy. |
| INTVCC (Pin 5) | Internal LDO output | 3.6V regulated supply for gate drivers and analog circuitry; bypass with ≥1µF ceramic capacitor to GND. |
| MODE/SYNC (Pin 6) | Operating mode select | Configures Burst Mode®, pulse-skipping, or forced continuous mode; also accepts external clock (±40% sync range). |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for multi-year battery life in IoT edge sensors. |
| Fixed 3.3V Output | Eliminates FB resistor network, saving PCB area and component cost; guarantees ±1% accuracy over temperature and line. |
| 1MHz Constant-Frequency PWM | Enables predictable EMI filtering and small passive components - ideal for handheld medical or test equipment. |
| Integrated Power Switches | 0.37Ω PMOS + 0.15Ω NMOS FETs reduce conduction loss and simplify BOM - no external MOSFET drivers or discrete switches required. |
| Full Dropout Support | Maintains regulation down to VIN = VOUT with controlled 100% duty cycle - essential for brown-out resilience in automotive start-stop systems. |
Applications
| Portable-Handheld Scanners | Industrial and Embedded Computing |
|---|---|
Use Scenario: Battery-powered barcode scanners requiring long runtime and instant wake-up from sleep. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator for CMOS image sensor, microcontroller, and Bluetooth LE radio. Use Value: 3.5µA quiescent current in Burst Mode® extends alkaline battery life beyond 2 years; 1MHz switching avoids audible noise in handheld ergonomics. | Use Scenario: DIN-rail mounted PLC I/O modules operating in uncontrolled ambient temperatures. IC Role / Device Role / Timing Role: Point-of-load regulator supplying 3.3V to ARM-based real-time controller and isolated CAN transceiver. Use Value: –40°C to 125°C operation and AEC-Q100-aligned reliability ensure uptime in factory-floor environments; 17V max input tolerates 24V DC bus transients. |
| Automotive Applications | Emergency Radio |
Use Scenario: Infotainment display backlight power supply in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Compact, efficient 3.3V bias rail for display driver ICs and touch controller ASICs. Use Value: 17V absolute max input withstands load-dump spikes; fixed 3.3V output eliminates calibration drift from resistor tolerance in production. | Use Scenario: Solar-charged emergency communication radios deployed in remote locations. IC Role / Device Role / Timing Role: Main 3.3V supply for SDR baseband processor and LoRaWAN transceiver under intermittent solar input. Use Value: Full dropout operation sustains regulation as battery voltage drops to 3.3V; ultralow IQ preserves charge during weeks of standby. |
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 | 3.3V fixed output, 1.2MHz switching, 17µA IQ in power-save mode, 3.6V–17V input | Higher IQ limits battery life in always-on use; lacks Burst Mode® deep-sleep capability | Select when board-level EMI filtering is prioritized over ultra-low IQ; requires external feedback for non-3.3V variants. |
| MAX17503GCU+T | Adjustable output (0.8V–15V), 2.2MHz, 10µA IQ, 4.5V–60V input, integrated MOSFETs | Wider input range but higher minimum input (4.5V); no fixed 3.3V option - requires resistor network | Select for high-voltage industrial inputs (>17V); avoid if footprint or IQ-critical; adds design complexity via external resistors. |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3621EDCB-3.3#TRMPBF delivers superior light-load efficiency (3.5µA vs ≥10µA), eliminates feedback components for 3.3V use, and provides tighter output accuracy (±1% vs ±2%) - making it optimal for space- and battery-constrained embedded systems.
Availability
LTC3621EDCB-3.3#TRMPBF is available at Aetrix Electronics and suitable for portable-handheld scanners, industrial embedded computing, and automotive applications requiring stable component supply, long-term lifecycle support, and guaranteed AEC-Q100-aligned reliability.
Supply support for LTC3621EDCB-3.3#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, communications, and automotive markets.
The LTC3621 product line delivers ultralow-quiescent-current monolithic buck regulators for battery-powered and energy-sensitive systems where efficiency at light loads and compact size are critical design requirements.
FAQ
What is the maximum input voltage rating for the LTC3621EDCB-3.3#TRMPBF?
The LTC3621EDCB-3.3#TRMPBF has an absolute maximum input voltage rating of 17V. Exceeding this voltage may cause permanent damage. The device includes built-in VIN overvoltage lockout that suspends operation above 19V (typical) and resumes at 18.7V, protecting internal MOSFETs during transient spikes - a key safeguard in automotive 12V systems.
Does the LTC3621EDCB-3.3#TRMPBF require external feedback resistors to set the output voltage?
No, the LTC3621EDCB-3.3#TRMPBF does not require external feedback resistors. It is a fixed 3.3V output variant - the FB pin is internally connected to the regulated output, eliminating the need for an external resistor divider. This simplifies layout, improves accuracy by removing resistor tolerance errors, and reduces BOM count and cost.
How does the MODE/SYNC pin function on the LTC3621EDCB-3.3#TRMPBF?
The MODE/SYNC pin on the LTC3621EDCB-3.3#TRMPBF selects operating mode: tie to INTVCC for Burst Mode® (3.5µA IQ), ground for pulse-skipping (lowest ripple), or apply 1V–VINTVCC–1.2V for forced continuous mode. It also accepts external clocks within ±40% of 1MHz for EMI synchronization - enabling deterministic switching in noise-sensitive applications.
What package type and thermal characteristics does the LTC3621EDCB-3.3#TRMPBF use?
The LTC3621EDCB-3.3#TRMPBF uses a 6-lead 2mm × 3mm plastic DFN package with 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 PCB thermal plane for effective heat dissipation - critical to sustain 1A output current at elevated ambient temperatures up to 125°C.
Is the LTC3621EDCB-3.3#TRMPBF qualified for automotive applications?
The LTC3621EDCB-3.3#TRMPBF is not itself AEC-Q100 qualified - only versions with the #W suffix (e.g., LTC3621EDCB-3.3#WTRMPBF) are automotive-grade. However, its E-grade temperature range (–40°C to 125°C), robust OVP/UVP protection, and proven reliability in industrial environments make it suitable for non-safety-critical automotive subsystems when validated per customer requirements.
LTC3621EDCB-3.3#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LTC3621EDCB-3.3#TRMPBF FAQ
1.How can I place an order for LTC3621EDCB-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EDCB-3.3#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-3.3#TRMPBF reliable?
The price and inventory of LTC3621EDCB-3.3#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-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EDCB-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EDCB-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EDCB-3.3#TRMPBF?
LTC3621EDCB-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EDCB-3.3#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-3.3#TRMPBF?
For technical support, including LTC3621EDCB-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EDCB-3.3#TRMPBF requirements.
6.How does Aetrix verify that LTC3621EDCB-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EDCB-3.3#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-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EDCB-3.3#TRMPBF?
All LTC3621EDCB-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EDCB-3.3#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-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621EDCB-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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