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Analog Devices Inc. LTC3621HMS8E-25#PBF
- Part No.:
- LTC3621HMS8E-25#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621HMS8E-25#PBF.pdf
- Description:
- IC REG BUCK 5V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:224
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Product details
Overview
LTC3621HMS8E-25#PBF from Analog Devices is a high-efficiency, 2.25MHz synchronous step-down regulator delivering up to 1A output current with 3.5µA quiescent current, ±1% output voltage accuracy, and fixed 5V output. It operates from 2.7V to 17V input and features Burst Mode®, pulse-skipping, and forced continuous operation modes - ideal for automotive emergency radios requiring ultra-low standby power and stable 5V rail generation.
For engineers reviewing the LTC3621HMS8E-25#PBF datasheet, LTC3621HMS8E-25#PBF pinout, LTC3621HMS8E-25#PBF application, or LTC3621HMS8E-25#PBF equivalent, this page delivers verified electrical parameters, MS8E package terminal mapping, thermal-grade (–40°C to 150°C) performance context, and real-world selection guidance for automotive and industrial DC/DC design.
Technical Context
The LTC3621HMS8E-25#PBF implements a constant-frequency peak current mode control architecture with internal compensation and 800µs soft-start. Its 2.25MHz switching frequency enables compact 2.2µH inductor and ceramic capacitor designs while maintaining stability across 2.7V–17V input range.
It integrates dual MOSFETs (top PMOS RDS(ON) = 0.37Ω, bottom NMOS RDS(ON) = 0.15Ω), overtemperature protection, VIN overvoltage lockout (19V), and a dedicated PGOOD output with ±7.5% window and 32-cycle blanking delay - all optimized for AEC-Q100-compliant automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external feedback divider, reduces BOM count and layout sensitivity. |
| Switching Frequency | 2.25MHz ±20% - enables use of sub-3mm inductors and low-ESR ceramic capacitors for space-constrained PCBs. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on automotive subsystems such as telematics or emergency alert modules. |
| Input Voltage Range | 2.7V to 17V - supports wide automotive battery transients (cold crank, load dump) without external pre-regulation. |
| Max Output Current | 1A continuous - sufficient for powering microcontrollers, CAN transceivers, and sensor interfaces in embedded ECUs. |
| Junction Temp Range | –40°C to +150°C - qualified for under-hood automotive environments per AEC-Q100 Grade H. |
| PGOOD Accuracy | ±7.5% window with 32-cycle blanking - prevents false fault assertions during load transients in safety-critical systems. |
Pinout & Package
8-lead thermally enhanced MSOP (MS8E) package with exposed pad (Pin 9 = GND), SGND (Pin 8) isolation, and integrated Power Good output - optimized for high-power density and thermal reliability in automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connection point for external inductor; carries high di/dt square wave - requires tight loop area and Kelvin routing. |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7V–17V; feeds internal LDO (INTVCC) and power switches - must be bypassed with ≥10µF ceramic near pin. |
| RUN (Pin 3) | Enable Control | Active-high logic input; <0.3V disables regulator, >1.0V enables - pulled high via resistor if always-on operation required. |
| FB (Pin 5) | Feedback Reference | Internally tied to 5V output - no external divider needed; unused in fixed-output variants. |
| INTVCC (Pin 6) | Internal LDO Output | 3.6V supply for gate drivers and analog circuitry - requires ≥1µF ceramic bypass to SGND. |
| MODE/SYNC (Pin 7) | Operation Mode Select | GND = pulse-skipping (low ripple); INTVCC = Burst Mode (low IQ); external clock = sync + forced continuous. |
| PGOOD (Pin 4) | Power Good Indicator | Open-drain output pulled high externally; asserts high when VOUT is within ±7.5% of 5V - used for system sequencing. |
| SGND (Pin 8) | Signal Ground | Dedicated low-noise reference for FB, MODE/SYNC, and PGOOD - isolated from power ground to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 3.5µA at light loads - critical for battery-backed automotive modules needing multi-year shelf life. |
| AEC-Q100 Qualified (Grade H) | Validated for –40°C to +150°C operation - meets automotive reliability requirements without derating. |
| Integrated PGOOD with Blanking | 32-cycle delay prevents false faults during dynamic load steps - simplifies system-level power sequencing logic. |
| 2.25MHz Fixed Switching | Enables <2.5mm × 2.5mm total solution size - suitable for compact infotainment and ADAS camera modules. |
| Full Dropout Operation | Maintains regulation down to VIN ≈ VOUT with low IQ - supports brownout resilience in 12V vehicle systems. |
Applications
| Automotive Emergency Radio | Industrial Telematics ECU |
|---|---|
Use Scenario: Powering AM/FM/NOAA receiver ICs and microcontroller in vehicle-mounted emergency alert systems with battery backup. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying core logic, audio codec, and RF front-end. Use Value: 3.5µA quiescent current extends 12V battery runtime during extended standby; 150°C rating ensures reliability near engine bay heat sources. |
Use Scenario: Generating stable 5V rail for GPS/GNSS module, cellular modem, and CAN controller in fleet management hardware. IC Role / Device Role / Timing Role: System power supervisor with PGOOD-driven reset sequencing and transient immunity. Use Value: ±7.5% PGOOD window and 32-cycle blanking prevent spurious resets during CAN bus noise or antenna switching events. |
| Portable Handheld Scanner | Embedded Computing Module |
Use Scenario: Powering CMOS image sensor, laser driver, and ARM Cortex-M MCU in battery-operated barcode scanners. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator stepping 7.4V Li-ion to 5V for peripheral interface rails. Use Value: 2.25MHz operation allows use of 2.2µH shielded inductor - minimizing solution height for ergonomic handheld form factor. |
Use Scenario: Providing regulated 5V to FPGA I/O banks, USB PHY, and DDR memory termination in edge AI inference modules. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC stage supporting burst-mode data acquisition and low-power sleep states. Use Value: SGND pin isolates analog feedback path from digital noise - preserving ADC reference stability during high-speed processing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3V–17V input, adjustable 0.9V–6V output, 3.5µA IQ, but only rated to 125°C (not AEC-Q100). | Lacks automotive qualification and fixed 5V option - requires external resistor divider and additional validation for under-hood use. | Select only for non-automotive industrial or consumer applications where temperature grade and fixed output are not mandatory. |
| MP2451DT-LF-Z | 4.5V–36V input, adjustable output, 2.2MHz, 1A, but 25µA IQ and no PGOOD or thermal grade beyond 125°C. | No integrated PGOOD, higher IQ degrades battery life, and wider VIN range adds unnecessary complexity for 12V systems. | Consider only when input exceeds 17V or cost is primary constraint - trade-offs include reduced efficiency, no automotive qualification, and missing fault signaling. |
Compared with TPS62130ARGTR and MP2451DT-LF-Z, the LTC3621HMS8E-25#PBF uniquely combines AEC-Q100 Grade H qualification, fixed 5V output, 3.5µA IQ, and integrated PGOOD - making it the only drop-in solution for automotive safety-critical 5V rail generation without redesign or derating.
Availability
LTC3621HMS8E-25#PBF is available at Aetrix Electronics and suitable for automotive emergency radio systems, industrial telematics ECUs, and portable handheld scanners requiring stable component supply, long-lifecycle support, and guaranteed AEC-Q100 compliance.
Supply support for LTC3621HMS8E-25#PBF 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 power management semiconductors, serving automotive, industrial, and communications markets with precision, reliability, and innovation.
The LTC3621 family is designed for ultra-low-quiescent-current, high-efficiency DC/DC conversion in space- and power-constrained applications - especially automotive subsystems demanding AEC-Q100 qualification and extended temperature operation.
FAQ
What is the maximum junction temperature rating for the LTC3621HMS8E-25#PBF?
The LTC3621HMS8E-25#PBF is specified for operation from –40°C to +150°C junction temperature and is AEC-Q100 Grade H qualified. This rating is validated through characterization and statistical process control - enabling reliable deployment in under-hood automotive environments where ambient temperatures exceed 105°C.
Does the LTC3621HMS8E-25#PBF require an external feedback resistor network?
No, the LTC3621HMS8E-25#PBF has a factory-trimmed internal feedback network set for 5.0V ±1% output. The FB pin (Pin 5) is internally connected to the output and requires no external resistors - reducing component count, layout complexity, and potential drift sources compared to adjustable variants.
How does the PGOOD function behave during output load transients on the LTC3621HMS8E-25#PBF?
The LTC3621HMS8E-25#PBF asserts PGOOD high only when VOUT remains within ±7.5% of 5V for 32 consecutive switching cycles. During fast load steps, the 32-cycle blanking delay prevents false low assertions - ensuring robust power sequencing in noisy automotive or industrial systems without requiring external filtering.
Can the LTC3621HMS8E-25#PBF synchronize to an external clock source?
Yes, the MODE/SYNC pin (Pin 7) of the LTC3621HMS8E-25#PBF accepts an external clock signal within ±40% of its nominal 2.25MHz frequency. When synchronized, the device operates in forced continuous mode and locks to the external clock within 2–3 cycles - useful for EMI reduction in noise-sensitive applications like infotainment head units.
What thermal performance can be expected from the LTC3621HMS8E-25#PBF in a typical 4-layer PCB layout?
In a standard 4-layer board with 2oz copper, 1in² exposed pad soldered to internal ground plane, the LTC3621HMS8E-25#PBF achieves θJA = 40°C/W and θJC = 10°C/W. At 1A load and 12V input, typical power dissipation is ~250mW - resulting in ~10°C rise above ambient, well within the 150°C junction limit even at 85°C ambient.
LTC3621HMS8E-25#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621HMS8E-25#PBF FAQ
1.How can I place an order for LTC3621HMS8E-25#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621HMS8E-25#PBF 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 LTC3621HMS8E-25#PBF reliable?
The price and inventory of LTC3621HMS8E-25#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621HMS8E-25#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621HMS8E-25#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621HMS8E-25#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621HMS8E-25#PBF?
LTC3621HMS8E-25#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621HMS8E-25#PBF 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 LTC3621HMS8E-25#PBF?
For technical support, including LTC3621HMS8E-25#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621HMS8E-25#PBF requirements.
6.How does Aetrix verify that LTC3621HMS8E-25#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621HMS8E-25#PBF 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 LTC3621HMS8E-25#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621HMS8E-25#PBF?
All LTC3621HMS8E-25#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621HMS8E-25#PBF, 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 LTC3621HMS8E-25#PBF part is unused and in its original packaging.
Return procedure for LTC3621HMS8E-25#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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