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Analog Devices Inc. LTC3621IDCB-5#TRMPBF
- Part No.:
- LTC3621IDCB-5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621IDCB-5#TRMPBF.pdf
- Description:
- IC REG BUCK 5V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:153
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Product details
Overview
LTC3621IDCB-5#TRMPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in a 6-lead DFN (2mm × 3mm) package, operating at fixed 1MHz switching frequency with 5V fixed output, ±1% output voltage accuracy, and ultralow 3.5µA quiescent current - deployed in automotive emergency radios requiring stable low-power 5V rail generation.
For engineers reviewing the LTC3621IDCB-5#TRMPBF datasheet, LTC3621IDCB-5#TRMPBF pinout, LTC3621IDCB-5#TRMPBF application, or LTC3621IDCB-5#TRMPBF equivalent, this page delivers verified technical context, real-world operating parameters, validated alternatives, and supply-chain support for industrial and automotive power design.
Technical Context
The LTC3621IDCB-5#TRMPBF uses constant-frequency peak current mode control with internal compensation and soft-start, enabling excellent line/load transient response. It integrates PMOS/NMOS synchronous switches with RDS(ON) of 0.37Ω/0.15Ω and supports full dropout operation down to VIN = VOUT.
Its MODE/SYNC pin enables selection among Burst Mode® (3.5µA IQ), pulse-skipping (low ripple), or forced continuous mode (stable EMI), while RUN pin provides logic-controlled enable and PGOOD indicates ±7.5% output regulation status - all within –40°C to 125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery-supplied systems. |
| Output Voltage | Fixed 5V ±1% - eliminates external feedback resistors; simplifies layout and improves accuracy. |
| Max Output Current | 1A - sufficient for powering microcontrollers, sensors, and interface ICs in compact embedded designs. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on emergency radio and portable scanner applications. |
| Switching Frequency | 1MHz (±8%) - enables use of small 2.2µH inductors and reduces EMI filtering requirements. |
| Package | 6-Lead DFN (2mm × 3mm) with exposed GND pad - provides low thermal resistance (θJA = 64°C/W) for high-power-density layouts. |
| Protection Features | Overtemperature, VIN overvoltage lockout (19V), and undervoltage lockout (2.7V) - ensures robust operation under fault conditions. |
Pinout & Package
6-Lead DFN (2mm × 3mm) package with exposed thermal pad (Pin 7) soldered to PCB ground for optimal thermal performance and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt switching current - requires tight loop layout to minimize EMI. |
| VIN (Pin 2) | Input supply | Accepts 2.7V–17V input; powers internal LDO (INTVCC) and gate drivers - bypass with ≥10µF ceramic capacitor. |
| RUN (Pin 3) | Enable control | Logic-high active; pulls low to disable regulator and reduce IQ to 0.1µA - must not be left floating. |
| FB (Pin 4) | Feedback reference | Internally tied to 5V output; no external resistor divider needed - simplifies design and improves stability. |
| INTVCC (Pin 5) | Internal LDO output | 3.6V regulated supply for gate drive and logic - bypass with ≥1µF ceramic capacitor to GND. |
| MODE/SYNC (Pin 6) | Operating mode select | Tie to INTVCC for Burst Mode®, to GND for pulse-skipping, or to external clock for synchronization - configures efficiency/ripple trade-off. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA in Burst Mode® enables >1-year battery life in maintenance-free emergency radios. |
| Fixed 5V output | Eliminates external feedback network - reduces BOM count, layout area, and calibration risk. |
| Internal soft-start | 800µs ramp prevents inrush current - protects input source and avoids system brownout during startup. |
| Synchronous rectification | Integrated PMOS/NMOS switches eliminate external Schottky loss - achieves up to 95% efficiency at 1A. |
| AEC-Q100 qualified | Rated for automotive applications - meets stress testing and reliability requirements for under-hood and infotainment systems. |
Applications
| Portable-Handheld Scanners | Automotive Applications |
|---|---|
Use Scenario: Battery-powered barcode scanners requiring reliable 5V rail during intermittent high-current decode bursts. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying MCU, imager, and USB interface - manages dynamic load steps up to 1A. Use Value: 3.5µA quiescent current extends alkaline battery life beyond 12 months; 1MHz switching allows compact 2.2µH inductor placement. | Use Scenario: Emergency radio modules in vehicles needing fail-safe 5V supply during engine cranking (VIN dips to 6V). IC Role / Device Role / Timing Role: Input-robust step-down regulator maintaining regulated 5V output across 6V–16V automotive battery transients. Use Value: Full dropout operation and 2.7V UVLO ensure uninterrupted function during cold-crank; AEC-Q100 qualification validates reliability. |
| Industrial and Embedded Computing | Emergency Radio |
Use Scenario: DIN-rail mounted PLC I/O modules requiring isolated 5V for digital logic and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated 5V DC-DC stage converting 12V/24V field bus to logic supply - operates continuously in forced continuous mode. Use Value: 1A rating supports multiple peripherals; internal compensation removes need for external loop tuning components. | Use Scenario: Hand-cranked or solar-charged emergency radios needing ultra-low standby power and fast wake-up. IC Role / Device Role / Timing Role: Main power converter delivering regulated 5V to audio amplifier, RF transceiver, and microcontroller - enters deep sleep between transmissions. Use Value: Zero-current shutdown draws only 0.1µA; Burst Mode® resumes regulation within microseconds upon load demand. |
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, 3.5µA IQ, 3MHz switching - no fixed 5V option; requires external feedback. | Requires resistor network for 5V; higher fSW demands tighter layout but enables smaller passives. | Select when adjustable output or higher frequency is required; verify loop stability with external compensation. |
| MAX17504ATP+T | 4.5V–60V input, adjustable output, 1.2A, 100µA IQ, 100kHz–2.2MHz programmable fSW - wider VIN, higher IQ, no fixed 5V variant. | Suitable for high-VIN industrial systems (e.g., 24V/48V rails); less suitable for battery-powered low-IQ designs. | Prefer for high-input-voltage applications where LTC3621IDCB-5#TRMPBF's 17V limit is insufficient. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3621IDCB-5#TRMPBF offers plug-and-play 5V regulation with lowest quiescent current and automotive qualification - ideal for space-constrained, battery-sensitive applications where fixed output and AEC-Q100 compliance are mandatory.
Availability
LTC3621IDCB-5#TRMPBF is available at Aetrix Electronics and suitable for automotive emergency radios, portable handheld scanners, industrial PLC modules, and embedded computing systems requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3621IDCB-5#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.
The LTC3621 product line delivers ultralow-IQ, high-efficiency synchronous buck regulators for battery-powered and automotive applications where extended runtime and robust transient performance are critical.
FAQ
What is the switching frequency of the LTC3621IDCB-5#TRMPBF?
The LTC3621IDCB-5#TRMPBF operates at a fixed 1MHz switching frequency with ±8% tolerance across temperature and input voltage. This frequency is factory-trimmed and cannot be adjusted externally - it enables compact magnetics and predictable EMI behavior without requiring external timing components. The LTC3621IDCB-5#TRMPBF does not support frequency adjustment or synchronization in its fixed-output configuration.
Does the LTC3621IDCB-5#TRMPBF require external feedback resistors?
No, the LTC3621IDCB-5#TRMPBF has an internally trimmed 5V output and does not require external feedback resistors. The FB pin is internally connected to the output, eliminating resistor matching errors and layout sensitivity. This simplifies design, improves long-term output accuracy, and reduces bill-of-materials cost compared to adjustable versions like the LTC3621IDCB-2#TRMPBF.
What protection features are integrated into the LTC3621IDCB-5#TRMPBF?
The LTC3621IDCB-5#TRMPBF integrates overtemperature protection, VIN overvoltage lockout (19V rising threshold), VIN undervoltage lockout (2.7V), and current-limit protection (1.6A typical). These features operate autonomously without external circuitry - ensuring safe shutdown during faults while maintaining regulation under normal conditions. No external thermal pad or sense resistors are required.
Can the LTC3621IDCB-5#TRMPBF operate in dropout mode?
Yes, the LTC3621IDCB-5#TRMPBF supports full dropout operation down to VIN = VOUT (5V). In dropout, the top PMOS switch remains fully enhanced, delivering unregulated but stable output as input declines. Efficiency remains high due to low RDS(ON), and the device maintains regulation until VIN falls below 2.7V UVLO threshold - critical for automotive cranking scenarios.
Is the LTC3621IDCB-5#TRMPBF qualified for automotive applications?
Yes, the LTC3621IDCB-5#TRMPBF is AEC-Q100 qualified for automotive applications and rated for operation from –40°C to +125°C junction temperature. It meets stress testing requirements for temperature cycling, humidity, and mechanical shock - making it suitable for infotainment, telematics, and emergency systems where reliability under harsh conditions is mandatory. The "I" grade denotes industrial/automotive qualification.
LTC3621IDCB-5#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LTC3621IDCB-5#TRMPBF FAQ
1.How can I place an order for LTC3621IDCB-5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IDCB-5#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-5#TRMPBF reliable?
The price and inventory of LTC3621IDCB-5#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-5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IDCB-5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IDCB-5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IDCB-5#TRMPBF?
LTC3621IDCB-5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IDCB-5#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-5#TRMPBF?
For technical support, including LTC3621IDCB-5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IDCB-5#TRMPBF requirements.
6.How does Aetrix verify that LTC3621IDCB-5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IDCB-5#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-5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IDCB-5#TRMPBF?
All LTC3621IDCB-5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IDCB-5#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-5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621IDCB-5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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