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Analog Devices Inc. LTC3621EDCB-25#TRPBF
- Part No.:
- LTC3621EDCB-25#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621EDCB-25#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,449
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Product details
Overview
LTC3621EDCB-25#TRPBF from Analog Devices is a 2.25MHz, 5V fixed-output synchronous step-down regulator delivering up to 1A output current from 2.7V–17V input. It features 3.5µA quiescent current in shutdown, ±1% output voltage accuracy, and operates in Burst Mode®, pulse-skipping, or forced continuous mode for optimized light-load efficiency or low ripple-ideal for automotive emergency radios and portable industrial scanners.
For engineers reviewing the LTC3621EDCB-25#TRPBF datasheet, LTC3621EDCB-25#TRPBF pinout, LTC3621EDCB-25#TRPBF application, or LTC3621EDCB-25#TRPBF equivalent, key selection criteria include its 2.25MHz switching frequency, 5V fixed output with 0.6V reference, 6-lead DFN (2mm × 3mm) thermal performance, and AEC-Q100-compliant operation across –40°C to 125°C.
Technical Context
The LTC3621EDCB-25#TRPBF uses peak current-mode control with internal compensation and an 800µs soft-start ramp. Its 2.25MHz fixed-frequency oscillator supports ±40% external synchronization via the MODE/SYNC pin, enabling EMI-sensitive designs to align switching with system clocks.
It integrates a PMOS high-side switch (0.37Ω RDS(ON)) and NMOS low-side switch (0.15Ω RDS(ON)), enabling full-dropout operation down to VIN ≈ VOUT. The FB pin is internally tied to VOUT for fixed 5V regulation, eliminating external resistors while maintaining 0.591V–0.609V reference accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V (±1% tolerance; no external feedback divider required) |
| Switching Frequency | 2.25MHz (±10% over temp; enables compact 2.2µH inductors and ceramic capacitors) |
| Max Output Current | 1A continuous (peak current limit 1.6A at E-grade; supports transient loads in embedded systems) |
| Quiescent Current | 3.5µA in shutdown (enables >1-year battery life in always-on emergency radio standby) |
| Input Voltage Range | 2.7V to 17V (supports wide automotive battery range including cold-crank and load-dump conditions) |
| Operating Temp Range | –40°C to +125°C (E-grade; qualified per AEC-Q100 for under-hood automotive use) |
| Package | 6-lead DFN (2mm × 3mm, 0.75mm height); exposed pad soldered to PCB for θJA = 64°C/W |
Pinout & Package
6-lead DFN (2mm × 3mm) package with exposed thermal pad (Pin 7 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point between internal PMOS/NMOS switches and external inductor; carries high di/dt square wave |
| VIN (Pin 2) | Power input | Primary input supply (2.7V–17V); powers internal LDO (INTVCC) and gate drivers |
| RUN (Pin 3) | Enable control | Active-high logic input; pull ≥1.0V to enable regulator; tie to GND to disable and enter 0.1µA shutdown |
| FB (Pin 4) | Feedback reference | Internally connected to VOUT; not user-accessible in fixed-5V variant (LTC3621EDCB-25#TRPBF) |
| INTVCC (Pin 5) | Bias LDO output | 3.6V internal LDO output; bypass with ≥1µF ceramic capacitor to GND for stable gate drive |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Configures operation mode (Burst/Pulse-skip/Forced Continuous) or accepts external clock (60–140% of 2.25MHz) |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ shutdown | 0.1µA shutdown current enables long-term battery storage without drain |
| Internal soft-start | 800µs controlled ramp prevents inrush current and output overshoot during power-up |
| Overtemperature protection | Thermal shutdown activates above 150°C junction; auto-recovery after cooldown |
| VIN overvoltage lockout | Disables switching at VIN > 19V; resumes at VIN < 18.7V to protect internal FETs during transients |
| Current-mode architecture | Provides inherent cycle-by-cycle current limiting and fast line/load transient response |
Applications
| Automotive Emergency Radio | Industrial Handheld Scanner |
|---|---|
Use Scenario: Power management in battery-backed vehicle emergency communication units requiring reliable 5V rail during cold-crank (5.5V) and load-dump (28V) events. IC Role / Device Role / Timing Role: Primary 5V DC/DC converter supplying microcontroller, RF transceiver, and audio codec from 12V battery. Use Value: 2.25MHz operation avoids AM radio band interference; 3.5µA IQ extends backup battery life to >18 months in sleep mode. |
Use Scenario: Compact barcode scanner powered by single-cell Li-ion (3.0–4.2V) with requirement for stable 5V USB-peripheral interface. IC Role / Device Role / Timing Role: Step-up/down buck regulator maintaining regulated 5V output across full battery discharge curve. Use Value: Wide 2.7V–17V input range accommodates both Li-ion and 9V alkaline operation; 6-lead DFN fits tight board space. |
| Embedded Computing Module | Portable Medical Sensor Hub |
Use Scenario: Powering ARM-based edge AI module in fanless industrial PC with strict thermal envelope and EMI limits. IC Role / Device Role / Timing Role: Main 5V supply for SoC, DDR memory, and PCIe peripherals. Use Value: 2.25MHz sync capability allows alignment with system clock to suppress conducted EMI peaks. |
Use Scenario: Battery-powered wearable sensor aggregator collecting ECG, SpO₂, and temperature data with Bluetooth LE transmission. IC Role / Device Role / Timing Role: Efficient 5V rail for BLE SoC and analog front-end ICs during intermittent active bursts. Use Value: Burst Mode® reduces average input current to 3.5µA at µA-level loads, extending clinical-grade battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3MHz fixed 5V output; 2.7V–6V input; 1.2A max; 17µA IQ in PWM mode; no SYNC pin | Not suitable for 12V automotive input; lacks overvoltage protection and AEC-Q100 qualification | Select when input is strictly ≤6V and EMI headroom permits higher switching frequency |
| MP2451DT-LF-Z | 2MHz fixed 5V output; 4.5V–36V input; 0.6A max; 260µA IQ; no light-load efficiency modes | Higher IQ degrades battery life; lower current rating limits multi-rail systems | Select only for cost-sensitive 12V industrial supplies where light-load efficiency is secondary |
Compared with TPS62130ARGTR and MP2451DT-LF-Z, the LTC3621EDCB-25#TRPBF uniquely combines 2.25MHz operation, 17V absolute max input, AEC-Q100 qualification, and sub-4µA shutdown IQ-making it the only option qualified for automotive emergency systems requiring both robustness and ultra-low standby power.
Availability
LTC3621EDCB-25#TRPBF is available at Aetrix Electronics and suitable for automotive emergency radios, industrial handheld scanners, and embedded computing modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3621EDCB-25#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 precision instrumentation, industrial automation, and automotive safety markets.
The LTC3621 series was designed specifically for space-constrained, battery-sensitive applications demanding ultralow IQ, wide input range, and automotive-grade reliability-targeting emergency comms, portable diagnostics, and ruggedized edge computing.
FAQ
What is the output voltage tolerance of the LTC3621EDCB-25#TRPBF?
The LTC3621EDCB-25#TRPBF delivers a fixed 5.0V output with ±1% initial accuracy over temperature and line/load conditions. Electrical characteristics specify VOUT = 4.95V to 5.05V at 25°C and 4.925V to 5.075V across the full –40°C to 125°C operating range, verified per Analog Devices' production test flow.
Does the LTC3621EDCB-25#TRPBF require external feedback resistors?
No. The LTC3621EDCB-25#TRPBF is the fixed 5V variant: its FB pin is internally connected to VOUT, eliminating external resistors. This simplifies layout, improves accuracy by removing resistor tolerance errors, and reduces bill-of-materials cost compared to adjustable versions like LTC3621EDCB-2#TRPBF.
Can the LTC3621EDCB-25#TRPBF be synchronized to an external clock?
Yes. The MODE/SYNC pin on the LTC3621EDCB-25#TRPBF accepts an external clock signal within 60–140% of its nominal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz). When engaged, the device enters forced continuous mode and locks to the external source within 2–3 cycles-critical for noise-sensitive automotive infotainment systems.
What thermal performance can be expected from the LTC3621EDCB-25#TRPBF in a 6-lead DFN package?
The LTC3621EDCB-25#TRPBF in the 6-lead DFN (2mm × 3mm) has θJA = 64°C/W and θJC = 9.6°C/W when the exposed pad is soldered to a 1-in² 2-oz copper thermal pad. At 1A load and 12V input, typical power dissipation is ~350mW, resulting in ~22°C rise above ambient-well within the 125°C max junction limit.
Is the LTC3621EDCB-25#TRPBF qualified for automotive applications?
Yes. The "E" grade in LTC3621EDCB-25#TRPBF denotes operation from –40°C to +125°C and compliance with AEC-Q100 Grade 1 stress testing. It includes VIN overvoltage lockout (19V), undervoltage lockout (2.7V), and overtemperature protection-meeting requirements for non-safety-critical automotive subsystems such as telematics and emergency alert systems.
LTC3621EDCB-25#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):
- 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)
LTC3621EDCB-25#TRPBF FAQ
1.How can I place an order for LTC3621EDCB-25#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EDCB-25#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-25#TRPBF reliable?
The price and inventory of LTC3621EDCB-25#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-25#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EDCB-25#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EDCB-25#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EDCB-25#TRPBF?
LTC3621EDCB-25#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EDCB-25#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-25#TRPBF?
For technical support, including LTC3621EDCB-25#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EDCB-25#TRPBF requirements.
6.How does Aetrix verify that LTC3621EDCB-25#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EDCB-25#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-25#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EDCB-25#TRPBF?
All LTC3621EDCB-25#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EDCB-25#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-25#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621EDCB-25#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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