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Analog Devices Inc. LTC3621IMS8E-25#TRPBF
- Part No.:
- LTC3621IMS8E-25#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621IMS8E-25#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,981
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Product details
Overview
LTC3621IMS8E-25#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in thermally enhanced MSOP-8 (MS8E) package with independent SGND pin and PGOOD output. It operates at fixed 2.25MHz switching frequency, delivers ±1% output voltage accuracy at 5V fixed output, supports input range 2.7V–17V, and achieves ultralow 3.5µA quiescent current in Burst Mode-ideal for automotive emergency radios and portable handheld scanners requiring high light-load efficiency.
For engineers reviewing the LTC3621IMS8E-25#TRPBF datasheet, LTC3621IMS8E-25#TRPBF pinout, LTC3621IMS8E-25#TRPBF application, or LTC3621IMS8E-25#TRPBF equivalent, key selection criteria include its 2.25MHz constant-frequency operation, 5V fixed output with 0.6V feedback reference, PGOOD monitoring capability, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3621IMS8E-25#TRPBF uses peak current mode control with internal compensation and 800µs soft-start. Its MODE/SYNC pin enables selection among Burst Mode (≤3.5µA IQ), pulse-skipping (low VOUT ripple), or forced continuous mode (stable frequency under all loads), and supports external clock synchronization within ±40% of 2.25MHz.
It integrates PMOS top and NMOS bottom power switches with RDS(ON) of 0.37Ω and 0.15Ω respectively, features overtemperature protection, VIN overvoltage lockout at 19V, and maintains regulation down to 100% duty cycle in dropout-enabling stable 5V output even as input drops near 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external resistor divider; ensures precise rail for microcontrollers and sensors. |
| Switching Frequency | 2.25MHz ±10% - enables compact 2.2µH inductors and reduces EMI filtering burden in space-constrained designs. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on automotive and portable applications. |
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive supplies including 12V nominal systems with transients. |
| Output Current | 1A continuous - sufficient for powering SoCs, FPGAs, or multi-rail subsystems from single-stage conversion. |
| Power Good Output | PGOOD with ±7.5% window and 32-cycle blanking - provides reliable system reset signaling without false triggers during load transients. |
| Thermal Rating | Junction temperature range –40°C to 125°C - qualified for extended-temperature automotive and industrial environments. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND); includes dedicated SGND (Pin 8) and PGOOD (Pin 4) pins for noise-sensitive signal integrity and system monitoring.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square wave-requires tight layout and low-inductance path 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; must be tied high or driven-floating causes undefined operation. |
| PGOOD (Pin 4) | Output voltage monitor | Open-drain output pulled low if VOUT deviates >±7.5%; used for sequencing or fault indication. |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for internal circuitry; bypass with ≥1µF to SGND for stability. |
| MODE/SYNC (Pin 7) | Operating mode select / sync input | Tie to INTVCC for Burst Mode, GND for pulse-skipping, or external clock for forced continuous sync. |
| SGND (Pin 8) | Signal ground | Dedicated low-noise return for FB, MODE/SYNC, and PGOOD-separate from power GND (exposed pad). |
| GND (Exposed Pad, Pin 9) | Power and thermal ground | Mandatory PCB solder connection; primary thermal path and power return for SW/VIN paths. |
Key Features
| Feature | Design Value |
|---|---|
| 2.25MHz fixed-frequency operation | Enables use of sub-3mm inductors and reduces solution footprint by >40% vs 500kHz alternatives. |
| 5V fixed output with ±1% accuracy | Eliminates external feedback resistors and associated tolerance stack-up-improves production yield and long-term stability. |
| Burst Mode with 3.5µA IQ | Extends battery runtime in standby modes of emergency radios and IoT edge nodes without compromising wake-up response. |
| PGOOD with 32-cycle blanking | Prevents false system resets during dynamic load steps-critical for reliable boot sequencing in automotive ECUs. |
| AEC-Q100 Grade I qualification | Validated for automotive ambient temperatures (–40°C to +125°C) and vibration/shock requirements-no requalification needed. |
| Independent SGND pin | Reduces noise coupling into feedback and control loops-essential for maintaining regulation accuracy in noisy vehicle electrical systems. |
Applications
| Automotive Emergency Radio | Industrial Handheld Scanner |
|---|---|
Use Scenario: Powering RF front-end, MCU, and audio codec in battery-backed vehicle emergency communication units. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering regulated rail from 12V battery with transient immunity up to 17V. Use Value: 3.5µA quiescent current preserves battery charge during weeks of standby; PGOOD ensures clean MCU reset on power-up. |
Use Scenario: Supplying image sensor, laser driver, and ARM Cortex-M processor in ruggedized warehouse barcode scanners. IC Role / Device Role / Timing Role: High-efficiency 5V source enabling >8-hour operation on single Li-ion cell with 2.7V cutoff. Use Value: 2.25MHz switching allows ultra-compact 2.2µH inductor and 22µF ceramic output cap-reducing board area by 35%. |
| Embedded Computing Module | Portable Medical Diagnostic Device |
Use Scenario: Generating stable 5V for FPGA configuration, DDR memory interface, and USB PHY in fanless edge AI modules. IC Role / Device Role / Timing Role: Synchronous buck regulator with forced continuous mode support for low-noise, ripple-sensitive digital loads. Use Value: Independent SGND and PGOOD enable clean power sequencing and EMI-controlled layout-meeting FCC Class B limits. |
Use Scenario: Providing isolated 5V rail for precision ADC, display controller, and Bluetooth LE radio in handheld ultrasound probes. IC Role / Device Role / Timing Role: Low-IQ, high-accuracy DC/DC converter ensuring uninterrupted operation during battery discharge from 4.2V to 2.7V. Use Value: ±1% output accuracy maintains sensor bias stability; 125°C junction rating supports sealed enclosure thermal design. |
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 | 3.0V–17V input, adjustable 0.9V–6.05V output, 2.25MHz, 3.5µA IQ, but no PGOOD or AEC-Q100 rating. | Lacks integrated power-good signaling and automotive qualification-requires external monitoring circuitry. | Choose when cost sensitivity outweighs need for PGOOD and automotive compliance. |
| MP2315GJ-Z | 4.5V–28V input, 5V fixed output, 2MHz, 25µA IQ, no SYNC/MODE pin, no PGOOD, SOIC-8 package. | Higher IQ and no system monitoring capability; larger SOIC-8 footprint increases PCB area by ~2.5× vs MS8E. | Choose only for non-automotive, non-battery-critical applications where size and low IQ are secondary. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621IMS8E-25#TRPBF uniquely combines AEC-Q100 qualification, integrated PGOOD, independent SGND, and 3.5µA IQ in an MSOP-8 package-making it the only drop-in solution for automotive and portable medical designs demanding reliability, small size, and precise power sequencing.
Availability
LTC3621IMS8E-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 full traceability and long-term lifecycle support.
Supply support for LTC3621IMS8E-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 industrial, automotive, communications, and healthcare markets since 1965.
The LTC3621 family was designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in space- and power-constrained automotive and portable applications-emphasizing reliability, small solution size, and seamless integration with microcontroller-based systems.
FAQ
What is the output voltage of the LTC3621IMS8E-25#TRPBF?
The LTC3621IMS8E-25#TRPBF provides a fixed 5.0V output with ±1% accuracy over temperature and line/load conditions. This eliminates the need for external feedback resistors and ensures consistent rail generation for downstream logic, sensors, and analog circuitry without calibration overhead.
Does the LTC3621IMS8E-25#TRPBF support external frequency synchronization?
Yes, the LTC3621IMS8E-25#TRPBF supports external clock synchronization via its MODE/SYNC pin, accepting input frequencies from 1.35MHz to 3.15MHz (±40% of its nominal 2.25MHz). When synchronized, it operates in forced continuous mode with immediate frequency lock after 2–3 external clock cycles.
What is the purpose of the SGND pin on the LTC3621IMS8E-25#TRPBF?
The SGND (Signal Ground) pin on the LTC3621IMS8E-25#TRPBF provides a dedicated low-noise return path for sensitive analog inputs-FB, MODE/SYNC, and PGOOD-separating them from high-current power ground (exposed pad). This minimizes noise coupling and improves regulation accuracy in electrically noisy environments like automotive cabins.
How does the PGOOD function work on the LTC3621IMS8E-25#TRPBF?
The PGOOD pin on the LTC3621IMS8E-25#TRPBF is an open-drain output that goes high when VOUT is within ±7.5% of 5.0V and remains high for at least 32 switching cycles after entering regulation. It pulls low immediately upon exiting regulation, with built-in blanking to prevent false triggering during transient load steps.
Is the LTC3621IMS8E-25#TRPBF qualified for automotive applications?
Yes, the LTC3621IMS8E-25#TRPBF is AEC-Q100 Grade I qualified (–40°C to +125°C operating junction temperature) and manufactured under controlled automotive processes. It meets stringent reliability, thermal, and ESD requirements for use in engine control units, infotainment systems, and emergency communication devices.
LTC3621IMS8E-25#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 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:
- 8-MSOP-EP
LTC3621IMS8E-25#TRPBF FAQ
1.How can I place an order for LTC3621IMS8E-25#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IMS8E-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 LTC3621IMS8E-25#TRPBF reliable?
The price and inventory of LTC3621IMS8E-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 LTC3621IMS8E-25#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IMS8E-25#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IMS8E-25#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IMS8E-25#TRPBF?
LTC3621IMS8E-25#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IMS8E-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 LTC3621IMS8E-25#TRPBF?
For technical support, including LTC3621IMS8E-25#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IMS8E-25#TRPBF requirements.
6.How does Aetrix verify that LTC3621IMS8E-25#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IMS8E-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 LTC3621IMS8E-25#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IMS8E-25#TRPBF?
All LTC3621IMS8E-25#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IMS8E-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 LTC3621IMS8E-25#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621IMS8E-25#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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