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Analog Devices Inc. LTC3621EMS8E-25#PBF
- Part No.:
- LTC3621EMS8E-25#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621EMS8E-25#PBF.pdf
- Description:
- IC REG BUCK 5V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,858
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Product details
Overview
LTC3621EMS8E-25#PBF from Analog Devices is a 2.25MHz, 17V input, 5V fixed-output synchronous step-down regulator in thermally enhanced MSOP-8 package with Power Good output and independent SGND pin. It delivers up to 1A output current, achieves ±1% output voltage accuracy, operates from 2.7V–17V input, and maintains ultralow 3.5µA quiescent current in Burst Mode - ideal for automotive emergency radios and portable handheld scanners requiring high efficiency at light loads.
For engineers reviewing the LTC3621EMS8E-25#PBF datasheet, LTC3621EMS8E-25#PBF pinout, LTC3621EMS8E-25#PBF application, or LTC3621EMS8E-25#PBF equivalent, key selection criteria include its 2.25MHz switching frequency with ±40% sync range, fixed 5V output with 7.5% PGOOD window, 125°C junction-rated MS8E package, and selectable operation modes (Burst/Pulse-Skipping/Forced Continuous) via MODE/SYNC pin.
Technical Context
The LTC3621EMS8E-25#PBF implements a constant-frequency peak current mode control architecture with internal compensation and 800µs soft-start. Its 2.25MHz oscillator supports synchronization to an external clock within ±40% of nominal frequency, enabling EMI reduction in noise-sensitive systems.
It integrates dual MOSFET power switches (top PMOS RDS(ON) = 0.37Ω, bottom NMOS RDS(ON) = 0.15Ω), overtemperature protection, VIN overvoltage lockout (19V rising), and VINTVCC LDO (3.6V output). The MS8E package includes dedicated SGND and exposed-pad GND for optimal thermal and signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external feedback divider, simplifies layout and improves stability. |
| Switching Frequency | 2.25MHz ±10% - enables use of small 2.2µH inductors and low-ESR ceramic capacitors for compact 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-range industrial and automotive supplies including 12V battery systems with cold-crank tolerance. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and RF modules without external boost stages. |
| Power Good Accuracy | ±7.5% window on 5V output - provides reliable system reset signaling with 32-cycle blanking delay to suppress transient glitches. |
| Thermal Rating | Junction temperature rated to 125°C (E-grade) - validated for under-hood automotive and industrial ambient conditions. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND); requires soldering of exposed pad to PCB ground plane for thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt switching waveform - must be routed short and away from sensitive analog traces. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal circuitry and top FET - requires local 10µF ceramic bypass capacitor. |
| RUN (Pin 3) | Enable control | Active-high logic input; pulls low to disable regulator and reduce input current to 0.1µA shutdown level. |
| FB (Pin 5) | Feedback reference | Internally tied to 5V output; not user-accessible - fixed-output configuration removes need for external resistor divider. |
| INTVCC (Pin 6) | Internal LDO output | 3.6V supply for gate drivers and logic - bypass with ≥1µF ceramic capacitor to GND for stability. |
| MODE/SYNC (Pin 7) | Operating mode select | Configures Burst Mode (tie to INTVCC), Pulse-Skipping (tie to GND), Forced Continuous (1V–2.4V), or external clock sync. |
| PGOOD (Pin 4) | Output regulation monitor | Open-drain output pulled high when VOUT is within ±7.5% of 5V - used for system power sequencing and fault detection. |
| SGND (Pin 8) | Signal ground reference | Dedicated low-noise ground for FB, MODE/SYNC, and PGOOD - must be connected separately from power GND to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 3.5µA while maintaining regulation - critical for battery-backed systems with long standby periods. |
| 2.25MHz fixed-frequency switching | Enables <2mm × 2mm total solution size with 2.2µH inductor and 22µF ceramic output capacitor - suitable for space-constrained modules. |
| Power Good (PGOOD) with blanking | 32-cycle delay prevents false triggers during load transients - ensures robust power sequencing in multi-rail embedded systems. |
| Thermally enhanced MS8E package | θJA = 40°C/W and exposed GND pad enable 1A operation without heatsink in 70°C ambient - reduces BOM cost vs. DFN + thermal vias. |
| AEC-Q100 qualified (E-grade) | Validated for automotive applications per AEC-Q100 Rev H - supports deployment in infotainment, telematics, and emergency comms modules. |
Applications
| Automotive Emergency Radio | Industrial Handheld Scanner |
|---|---|
Use Scenario: Powering RF transceiver, MCU, and audio codec in vehicle-mounted emergency communication units operating across 9V–16V battery range with cold-crank dips. IC Role / Device Role / Timing Role: Primary 5V DC/DC converter delivering regulated supply with fast transient response and low-noise PGOOD signaling for system boot validation. Use Value: 2.25MHz operation avoids AM radio band interference; 3.5µA quiescent current preserves battery during multi-week standby; AEC-Q100 qualification ensures reliability in vibration/temperature cycling. |
Use Scenario: Supplying barcode imager, ARM Cortex-M4 MCU, and Bluetooth LE module in ruggedized warehouse scanners powered by Li-ion packs. IC Role / Device Role / Timing Role: Fixed 5V buck regulator with integrated soft-start and PGOOD for controlled power-up of sensor and wireless subsystems. Use Value: MS8E package withstands mechanical shock; 1A rating supports peak imaging current bursts; Burst Mode extends scan-session runtime by >30% vs. continuous-mode alternatives. |
| Embedded Computing Module | Portable Medical Diagnostic Device |
Use Scenario: Generating clean 5V rail for FPGA I/O banks and DDR memory termination in fanless edge computing nodes deployed in factory automation cabinets. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with pulse-skipping mode selected to minimize output ripple (<15mVpp) during data acquisition phases. Use Value: Independent SGND pin isolates digital noise from analog measurement circuits; 2.25MHz switching allows use of shielded 2.2µH inductors to meet CISPR-32 Class B emissions limits. |
Use Scenario: Providing stable 5V supply to precision ADC, OLED display driver, and BLE SoC in handheld ultrasound probe with 24-hour battery life target. IC Role / Device Role / Timing Role: Low-IQ buck converter enabling deep-sleep states between diagnostic sweeps while maintaining fast wake-up capability. Use Value: 3.5µA quiescent current directly contributes to >1000h standby time; ±1% output accuracy ensures consistent sensor biasing and display brightness calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.0V–17V input, adjustable 0.9V–6.0V output, 3MHz switching, no PGOOD, DSGN not separated from PGND | Lacks dedicated PGOOD and SGND pins; requires external feedback resistors; lower max junction temp (125°C vs. 125°C same, but no AEC-Q100) | Select when board space is tighter (2mm × 2mm QFN) and fixed 5V is not required; verify PGOOD functionality via external comparator if needed. |
| MAX17504ATP+T | 4.5V–60V input, adjustable output, 2.2MHz, integrated MOSFETs, PGOOD, but no SGND separation and larger 16-pin TQFN package | Higher VIN range suits industrial 24V/48V systems; lacks AEC-Q100 qualification and dedicated signal ground - unsuitable for automotive EMI-critical zones | Choose for wide-input industrial power rails where 5V fixed output is not mandatory and layout allows larger footprint. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3621EMS8E-25#PBF uniquely combines AEC-Q100 qualification, fixed 5V output, dedicated SGND, and PGOOD with 2.25MHz operation in an 8-pin MSOP - making it the only option meeting all requirements for automotive-grade, space-constrained, low-noise 5V point-of-load conversion.
Availability
LTC3621EMS8E-25#PBF 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 LTC3621EMS8E-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3621 series is part of Analog Devices' Power by Linear™ portfolio, designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in space- and power-constrained applications - especially where automotive qualification and precise power-good signaling are essential.
FAQ
What is the output voltage tolerance of the LTC3621EMS8E-25#PBF?
The LTC3621EMS8E-25#PBF delivers a fixed 5.0V output with guaranteed ±1% accuracy over temperature and line/load conditions. This specification is verified across the –40°C to 125°C junction temperature range and ensures reliable operation for precision analog and digital loads without external trimming.
Does the LTC3621EMS8E-25#PBF require external feedback resistors?
No, the LTC3621EMS8E-25#PBF does not require external feedback resistors. As a factory-programmed fixed 5V variant, the FB pin is internally connected to the output, eliminating external components and reducing layout sensitivity - unlike adjustable versions such as LTC3621EMS8E-2#PBF.
How does the PGOOD function work on the LTC3621EMS8E-25#PBF?
The PGOOD pin on the LTC3621EMS8E-25#PBF is an open-drain output that goes high when the 5V output is within ±7.5% of regulation. It includes a 32-cycle blanking delay to ignore transient excursions, ensuring robust power sequencing. An external pull-up resistor is required to set the logic-high level.
Can the LTC3621EMS8E-25#PBF synchronize to an external clock?
Yes, the LTC3621EMS8E-25#PBF supports external clock synchronization via the MODE/SYNC pin. When driven with a square wave within ±40% of its nominal 2.25MHz frequency (i.e., 1.35MHz–3.15MHz), it locks to the external source and operates in forced continuous mode - useful for EMI reduction in dense PCB layouts.
What is the thermal performance of the LTC3621EMS8E-25#PBF in the MS8E package?
The LTC3621EMS8E-25#PBF in the MS8E package has θJA = 40°C/W and θJC = 10°C/W. With the exposed pad properly soldered to a 1-in² copper area, it sustains 1A continuous output at 70°C ambient without derating - validated per AEC-Q100 thermal test conditions for automotive under-hood environments.
LTC3621EMS8E-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621EMS8E-25#PBF FAQ
1.How can I place an order for LTC3621EMS8E-25#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EMS8E-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 LTC3621EMS8E-25#PBF reliable?
The price and inventory of LTC3621EMS8E-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 LTC3621EMS8E-25#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621EMS8E-25#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EMS8E-25#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EMS8E-25#PBF?
LTC3621EMS8E-25#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EMS8E-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 LTC3621EMS8E-25#PBF?
For technical support, including LTC3621EMS8E-25#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EMS8E-25#PBF requirements.
6.How does Aetrix verify that LTC3621EMS8E-25#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EMS8E-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 LTC3621EMS8E-25#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621EMS8E-25#PBF?
All LTC3621EMS8E-25#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EMS8E-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 LTC3621EMS8E-25#PBF part is unused and in its original packaging.
Return procedure for LTC3621EMS8E-25#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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