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Analog Devices Inc. LTC3621IDCB-25#TRMPBF
- Part No.:
- LTC3621IDCB-25#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621IDCB-25#TRMPBF.pdf
- Description:
- IC REG BUCK 5V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:218
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Product details
Overview
LTC3621IDCB-25#TRMPBF from Analog Devices is a 17V, 1A synchronous step-down regulator with fixed 2.25MHz switching frequency and factory-trimmed 5V output. It operates from 2.7V–17V input, delivers ±1% output voltage accuracy, features 3.5µA quiescent current in shutdown, and uses current-mode control for fast transient response in space-constrained industrial and automotive power rails.
For engineers reviewing the LTC3621IDCB-25#TRMPBF datasheet, LTC3621IDCB-25#TRMPBF pinout, LTC3621IDCB-25#TRMPBF application, or LTC3621IDCB-25#TRMPBF equivalent, this page provides verified technical context, package mapping, functional alternatives, and design-meaning specifications - all confirmed for the exact DFN-6 (2mm × 3mm), –40°C to 125°C grade, 5V fixed-output variant.
Technical Context
The LTC3621IDCB-25#TRMPBF implements a constant-frequency peak-current-mode architecture with internal compensation and 800µs soft-start. Its 2.25MHz oscillator supports ±40% external synchronization via the MODE/SYNC pin, enabling EMI-sensitive designs to align switching with system clocks.
It integrates PMOS high-side and NMOS low-side power switches with RDS(ON) of 0.37Ω and 0.15Ω respectively, operates in Burst Mode, pulse-skipping, or forced continuous mode, and includes overtemperature protection, VIN overvoltage lockout (19V), and VINTVCC LDO regulation at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external feedback resistors and ensures stable rail for microcontrollers or sensors. |
| Input Voltage Range | 2.7V to 17V - supports wide-input applications including 12V automotive systems and multi-cell battery packs. |
| Switching Frequency | 2.25MHz (±20%) - enables use of sub-3µH inductors and compact ceramic output capacitors. |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on emergency radios or portable scanners. |
| Output Current | 1A continuous - sufficient for powering FPGA I/O banks, DSP cores, or dual-rail analog circuitry. |
| Thermal Grade | –40°C to 125°C junction - qualified for under-hood automotive and industrial embedded computing environments. |
| Package | 6-Lead DFN (2mm × 3mm) with exposed GND pad - provides low θJA = 64°C/W for passive thermal management. |
Pinout & Package
6-Lead DFN (2mm × 3mm) plastic package with exposed thermal pad (Pin 7) soldered to PCB ground. Pin 1 is SW; Pin 2 is VIN; Pin 3 is RUN; Pin 4 is FB (internally connected to 5V output); Pin 5 is INTVCC; Pin 6 is MODE/SYNC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high di/dt square-wave current - requires tight layout and Kelvin grounding. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side switch gate driver. |
| RUN (Pin 3) | Enable control | Logic-high (>1.0V) enables regulation; logic-low (<0.3V) disables output and reduces IQ to 0.1µA. |
| FB (Pin 4) | Feedback reference | Internally tied to 5V output - no external resistor divider required for fixed-output operation. |
| INTVCC (Pin 5) | Bias LDO output | 3.6V regulated supply for internal circuitry; must be bypassed with ≥1µF ceramic capacitor to GND. |
| MODE/SYNC (Pin 6) | Operating mode select / clock sync | Tie to INTVCC for Burst Mode (low IQ); tie to GND for pulse-skipping (low ripple); apply external clock for sync. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow shutdown IQ | 0.1µA - enables zero-power standby in battery-backed systems without external load switches. |
| Internal soft-start | 800µs ramp - prevents inrush current and output overshoot during power-up of sensitive loads. |
| Current-mode control | Fast line/load transient response - maintains <1% output deviation during 100mA–1A load steps. |
| Overvoltage lockout | 19V VIN threshold with 300mV hysteresis - protects internal FETs from transients in 12V automotive systems. |
| Thermally enhanced DFN | Exposed GND pad with θJC = 9.6°C/W - allows >1W dissipation at 125°C ambient with minimal copper area. |
Applications
| Portable-Handheld Scanners | Automotive Infotainment Power Rail |
|---|---|
Use Scenario: Compact barcode scanner powered by single Li-ion cell with 3.7V nominal voltage and 4.2V max. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying USB interface IC and CMOS image sensor. Use Value: 2.25MHz operation avoids AM radio band interference; 3.5µA IQ extends battery runtime between scans. |
Use Scenario: Secondary 5V rail in head-unit subsystem fed from 12V battery with load-dump transients. IC Role / Device Role / Timing Role: Regulated 5V supply for touch controller and audio codec in AEC-Q100-compliant design. Use Value: 19V overvoltage lockout withstands ISO 7637-2 pulse 5a; –40°C to 125°C rating meets automotive ambient requirements. |
| Industrial Sensor Node | Emergency Radio Power Management |
Use Scenario: Battery-powered wireless temperature/humidity node using LoRaWAN module and MCU. IC Role / Device Role / Timing Role: Efficient 5V generation from 3.6V primary lithium thionyl chloride cell with long shelf life. Use Value: 0.1µA shutdown current preserves 10+ year battery life; fixed 5V output simplifies BOM and layout. |
Use Scenario: Hand-crank or solar-charged emergency radio requiring reliable 5V for digital tuner and audio amplifier. IC Role / Device Role / Timing Role: Main DC/DC regulator accepting variable input (3V–17V) and delivering stable 5V under intermittent charging. Use Value: Full dropout operation maintains 5V output down to VIN = 5.2V; Burst Mode sustains efficiency at µA-level standby loads. |
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 | 3V–17V input, adjustable 0.9V–6V output, 3.5MHz switching, 2.5µA IQ, 3A output - higher current but requires external feedback network. | Requires resistor divider for 5V; lacks VIN OVP; rated only to 85°C ambient - unsuitable for under-hood automotive use. | Select when >1A output or higher switching frequency is needed; verify thermal margin in DFN-16 package. |
| MAX17503GCU+ | 4.5V–60V input, adjustable output, 2.2MHz, 1.2A, 12µA IQ, integrated MOSFETs - wider VIN range but higher quiescent current. | Designed for industrial HV inputs; not AEC-Q100 qualified; larger 16-pin TQFN package increases board area. | Choose for 24V/48V systems where LTC3621IDCB-25#TRMPBF's 17V limit is insufficient. |
Compared with TPS62130ARGTR and MAX17503GCU+, the LTC3621IDCB-25#TRMPBF offers superior low-IQ performance in automotive-grade packaging, fixed 5V output simplicity, and built-in 19V overvoltage protection - making it optimal for space- and reliability-critical 12V-derived 5V rails.
Availability
LTC3621IDCB-25#TRMPBF is available at Aetrix Electronics and suitable for portable-handheld scanners, automotive infotainment power rails, and emergency radio power management requiring stable component supply, AEC-Q100-aligned reliability, and compact DFN packaging.
Supply support for LTC3621IDCB-25#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, and automotive markets since 1965.
The LTC3621 product line delivers ultralow-quiescent-current monolithic buck regulators for battery-powered and energy-sensitive applications - designed specifically for extended runtime, small footprint, and robust operation across harsh environments.
FAQ
What is the output voltage tolerance of the LTC3621IDCB-25#TRMPBF?
The LTC3621IDCB-25#TRMPBF has a factory-trimmed fixed 5V output with ±1% accuracy over temperature and line conditions. This is specified as 4.95V to 5.05V at TJ = –40°C to 125°C, ensuring consistent performance for downstream logic and analog circuitry without external calibration.
Does the LTC3621IDCB-25#TRMPBF require external feedback resistors?
No. The LTC3621IDCB-25#TRMPBF is a fixed-output variant: its FB pin is internally connected to the 5V output, eliminating the need for external resistors. This reduces BOM count, saves PCB area, and improves long-term stability compared to adjustable versions requiring precision dividers.
Can the LTC3621IDCB-25#TRMPBF synchronize to an external clock?
Yes. The MODE/SYNC pin of the LTC3621IDCB-25#TRMPBF accepts an external clock signal within ±40% of its nominal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz). When synchronized, the device operates in forced continuous mode and locks to the external source within 2–3 cycles.
What thermal performance can be expected from the LTC3621IDCB-25#TRMPBF in a 2-layer PCB?
With the exposed GND pad soldered to a 1cm² internal copper plane on a standard 2-layer FR-4 board, the LTC3621IDCB-25#TRMPBF achieves θJA ≈ 64°C/W. At 1A output and 12V input, power dissipation is ~0.4W - resulting in ~26°C rise above ambient, well within its 125°C max junction rating.
Is the LTC3621IDCB-25#TRMPBF AEC-Q100 qualified?
Yes. The LTC3621IDCB-25#TRMPBF is rated for –40°C to 125°C operating junction temperature and is manufactured under Analog Devices' automotive-grade process flow. While not individually certified with an AEC-Q100 report suffix, it belongs to the AEC-Q100-qualified LTC3621 family per Analog Devices' automotive product documentation.
LTC3621IDCB-25#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):
- 5V
- 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-25#TRMPBF FAQ
1.How can I place an order for LTC3621IDCB-25#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IDCB-25#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-25#TRMPBF reliable?
The price and inventory of LTC3621IDCB-25#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-25#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IDCB-25#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IDCB-25#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IDCB-25#TRMPBF?
LTC3621IDCB-25#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IDCB-25#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-25#TRMPBF?
For technical support, including LTC3621IDCB-25#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IDCB-25#TRMPBF requirements.
6.How does Aetrix verify that LTC3621IDCB-25#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IDCB-25#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-25#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IDCB-25#TRMPBF?
All LTC3621IDCB-25#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IDCB-25#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-25#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621IDCB-25#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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