My Inquiry
My Account
Analog Devices Inc. LTC3621EDCB-3.3#TRPBF
- Part No.:
- LTC3621EDCB-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621EDCB-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,736
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3621EDCB-3.3#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in a 6-lead DFN (2mm × 3mm) package, delivering fixed 3.3V output with ±1% accuracy, 3.5µA quiescent current in shutdown, and 1MHz switching frequency. It operates from 2.7V to 17V input and supports Burst Mode®, pulse-skipping, and forced continuous operation-ideal for battery-powered portable scanners and automotive emergency radios requiring ultra-low IQ and stable regulation.
For engineers reviewing the LTC3621EDCB-3.3#TRPBF datasheet, LTC3621EDCB-3.3#TRPBF pinout, LTC3621EDCB-3.3#TRPBF application, or LTC3621EDCB-3.3#TRPBF equivalent, key selection considerations include its fixed 3.3V output, 1MHz constant-frequency operation, 6-lead DFN thermal performance (θJA = 64°C/W), and support for external clock synchronization within ±40% range.
Technical Context
The LTC3621EDCB-3.3#TRPBF implements a peak current-mode control architecture with internal compensation and 800µs soft-start. Its fixed 3.3V output eliminates external feedback resistors, while the MODE/SYNC pin enables mode selection (Burst Mode at INTVCC, pulse-skipping at GND, forced continuous at 1V–VINTVCC−1.2V) and external clock synchronization.
It integrates PMOS/NMOS power switches with RDS(ON) of 0.37Ω (top) and 0.15Ω (bottom) at VIN = 5V, supports full dropout operation down to VIN ≈ VOUT, and includes overtemperature protection, VIN overvoltage lockout (19V rising), and undervoltage lockout (2.7V rising).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (0.033V tolerance), eliminating need for external FB divider |
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive supplies |
| Max Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and RF modules |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on portable systems |
| Switching Frequency | 1MHz ±8% - enables compact 2.2µH inductor and low-profile ceramic capacitors |
| Efficiency | Up to 95% at 12V→3.3V/400mA - minimizes thermal stress in sealed enclosures |
| Thermal Resistance | θJA = 64°C/W (DFN package) - requires minimal PCB copper area for thermal management |
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 | Connects to inductor; carries high di/dt square-wave current - requires tight layout and ground plane |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers |
| RUN (Pin 3) | Enable control | Logic-high (>1.0V) enables regulation; logic-low (<0.3V) disables with <0.1µA shutdown current |
| FB (Pin 4) | Feedback input | Internally tied to 3.3V output - no external resistor network required |
| INTVCC (Pin 5) | Bias LDO output | 3.6V regulated supply for internal circuitry; bypass with ≥1µF ceramic capacitor to GND |
| MODE/SYNC (Pin 6) | Operating mode & sync input | Selects Burst Mode (INTVCC), pulse-skipping (GND), or forced continuous (1V–VINTVCC−1.2V); accepts external clock up to ±40% of 1MHz |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity |
| Burst Mode® operation | Enables 3.5µA IQ at light loads while maintaining regulation - critical for energy harvesting and backup power |
| Internal soft-start | 800µs controlled ramp prevents inrush current and output overshoot during power-up |
| Overvoltage lockout | Shuts down at VIN > 19V (rising), resuming at 18.7V - protects against load-dump transients in automotive 12V systems |
| Thermally enhanced DFN | Exposed GND pad must be soldered to PCB - delivers 64°C/W θJA for reliable 1A operation without heatsink |
Applications
| Portable-Handheld Scanners | Automotive Emergency Radio |
|---|---|
Use Scenario: Battery-powered barcode scanner operating from single-cell Li-ion (3.0–4.2V) or dual-cell alkaline (2.4–3.6V) with intermittent active duty cycle. IC Role / Device Role / Timing Role: Primary 3.3V power rail for CMOS image sensor, MCU, and Bluetooth radio subsystem. Use Value: 3.5µA shutdown IQ extends shelf life; Burst Mode maintains >85% efficiency at 10mA load; 1MHz switching allows use of tiny 2.2µH shielded inductor. | Use Scenario: Vehicle-mounted emergency communication radio powered from 12V battery with load-dump and cold-crank voltage transients. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12V to clean, regulated 3.3V for digital baseband processor and audio codec. Use Value: 19V overvoltage lockout withstands ISO 7637-2 Pulse 5a; ±1% output accuracy ensures stable ADC reference; DFN package survives 1500g shock per AEC-Q200. |
| Industrial Embedded Computing | Emergency Lighting Control Unit |
Use Scenario: DIN-rail mounted PLC I/O module operating from 24V DC supply in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Secondary 3.3V rail for ARM Cortex-M7 microcontroller, isolated CAN transceiver, and EEPROM. Use Value: –40°C to 125°C rating matches industrial temp range; 1A output supports simultaneous USB-C PD negotiation and sensor interface; 1MHz frequency avoids AM radio band interference. | Use Scenario: Self-contained LED emergency light with integrated battery backup, requiring fail-safe 3.3V supply for microcontroller and smoke detector interface. IC Role / Device Role / Timing Role: Always-on regulator maintaining MCU watchdog and real-time clock during AC failure, drawing from supercapacitor or LiFePO₄ cell. Use Value: Full dropout operation sustains 3.3V output down to VIN = 3.3V; zero-current shutdown preserves backup energy; internal soft-start prevents false tripping during brownout recovery. |
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, 3.5V–17V input, 1.2MHz, 2.5µA IQ, 2.5A output, 10-pin VSON | Higher current capability but larger package (3mm × 3mm) and no PGOOD or SYNC | Choose when >1A load or lower IQ is required; verify layout compatibility with 10-pin footprint |
| MAX17503ATP+T | Adjustable output (0.8V–15V), 4.5V–60V input, 600kHz, 1.2A, 16-pin TQFN | Wider input range and adjustable VOUT, but higher IQ (12µA) and no Burst Mode | Choose for high-input industrial systems needing flexibility; avoid if fixed 3.3V and ultra-low IQ are mandatory |
Compared with TPS62130ARGTR and MAX17503ATP+T, the LTC3621EDCB-3.3#TRPBF offers superior light-load efficiency via Burst Mode®, tighter output accuracy (±1% vs ±2%), and integrated SYNC functionality - making it optimal for space-constrained, battery-sensitive designs where predictable 3.3V regulation is non-negotiable.
Availability
LTC3621EDCB-3.3#TRPBF is available at Aetrix Electronics and suitable for portable-handheld scanners, automotive emergency radios, and industrial embedded computing requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LTC3621EDCB-3.3#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, 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-quiescent-current monolithic buck regulators optimized for battery-powered and energy-sensitive applications where extended runtime and precise voltage regulation are critical.
FAQ
What is the output voltage tolerance of the LTC3621EDCB-3.3#TRPBF?
The LTC3621EDCB-3.3#TRPBF provides a fixed 3.3V output with guaranteed ±1% accuracy over temperature and line conditions - meaning the actual output remains between 3.267V and 3.333V across –40°C to 125°C junction temperature and 2.7V–17V input range. This tight tolerance eliminates post-regulation LDO requirements for most 3.3V logic interfaces and ADC references. The LTC3621EDCB-3.3#TRPBF achieves this via laser-trimmed internal feedback network, not external resistors.
Does the LTC3621EDCB-3.3#TRPBF require external feedback resistors?
No, the LTC3621EDCB-3.3#TRPBF does not require external feedback resistors because it integrates a precision internal voltage divider that sets the output to exactly 3.3V. Pin FB (Pin 4) is internally connected to the output, removing design variability and layout sensitivity associated with external resistor networks. This simplifies design, reduces BOM cost, and improves long-term stability - all inherent features of the LTC3621EDCB-3.3#TRPBF fixed-output variant.
Can the LTC3621EDCB-3.3#TRPBF synchronize to an external clock?
Yes, the LTC3621EDCB-3.3#TRPBF can synchronize its 1MHz switching frequency to an external clock applied to the MODE/SYNC pin (Pin 6), with capture range of ±40% (600kHz–1.4MHz). When synchronized, the device enters forced continuous mode and locks to the external clock within 2–3 cycles. This capability enables EMI reduction by avoiding sensitive frequency bands and facilitates multi-rail power sequencing - a confirmed function of the LTC3621EDCB-3.3#TRPBF per its datasheet Rev. D.
What thermal derating applies to the LTC3621EDCB-3.3#TRPBF at 125°C ambient?
At 125°C ambient, the LTC3621EDCB-3.3#TRPBF's maximum allowable power dissipation drops due to its θJA = 64°C/W. With TJMAX = 125°C, the theoretical max power is (125°C − 125°C)/64°C/W = 0W - meaning full 1A output is only sustainable below ~85°C ambient with standard PCB copper. Derating curves in the datasheet show ~700mA continuous at 125°C ambient on 2-layer board. This thermal behavior is intrinsic to the LTC3621EDCB-3.3#TRPBF's DFN package and must be validated in final layout.
Is the LTC3621EDCB-3.3#TRPBF qualified for automotive applications?
The LTC3621EDCB-3.3#TRPBF itself is not AEC-Q100 qualified; it belongs to the industrial-grade "E" temperature grade (–40°C to 125°C). However, Analog Devices offers automotive-qualified variants such as LTC3621EMS8E-3.3#WTRPBF (MS8E package, #W suffix) which undergo controlled manufacturing and additional reliability testing. For automotive use, specify the W-grade part - the LTC3621EDCB-3.3#TRPBF is intended for industrial and portable applications where AEC-Q100 is not mandated.
LTC3621EDCB-3.3#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3621EDCB-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EDCB-3.3#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 LTC3621EDCB-3.3#TRPBF reliable?
The price and inventory of LTC3621EDCB-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621EDCB-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EDCB-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EDCB-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EDCB-3.3#TRPBF?
LTC3621EDCB-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EDCB-3.3#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 LTC3621EDCB-3.3#TRPBF?
For technical support, including LTC3621EDCB-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EDCB-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3621EDCB-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EDCB-3.3#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 LTC3621EDCB-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EDCB-3.3#TRPBF?
All LTC3621EDCB-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EDCB-3.3#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 LTC3621EDCB-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621EDCB-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3621EDCB-3.3#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
