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Analog Devices Inc. LTC3621HMS8E-3.3#PBF
- Part No.:
- LTC3621HMS8E-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621HMS8E-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,479
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Product details
Overview
LTC3621HMS8E-3.3#PBF from Analog Devices is a 17V, 1A synchronous step-down regulator in thermally enhanced MSOP-8 (MS8E) package with fixed 3.3V output, 2.25MHz switching frequency, ±1% output voltage accuracy, and 3.5µA quiescent current in Burst Mode - deployed in automotive infotainment power rails and industrial sensor nodes requiring high efficiency at light loads.
For engineers reviewing the LTC3621HMS8E-3.3#PBF datasheet, LTC3621HMS8E-3.3#PBF pinout, LTC3621HMS8E-3.3#PBF application, or LTC3621HMS8E-3.3#PBF equivalent, this page delivers verified electrical specs, thermal performance data, PGOOD timing behavior, MODE/SYNC configuration options, and validated automotive-grade alternatives for AEC-Q100-compliant designs.
Technical Context
The LTC3621HMS8E-3.3#PBF implements a constant-frequency peak-current-mode control architecture with internal compensation, supporting forced continuous, pulse-skipping, and Burst Mode® operation via the MODE/SYNC pin. It features integrated PMOS/NMOS power switches with RDS(ON) of 0.37Ω/0.15Ω and operates across –40°C to +150°C junction temperature.
Its MS8E package includes dedicated SGND and PGOOD pins, enabling precise signal grounding and reliable output voltage monitoring with ±7.5% regulation window and 32-cycle blanking delay. VIN overvoltage lockout triggers at 19V with 300mV hysteresis, and undervoltage lockout activates below 2.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery-supplied systems without external pre-regulation. |
| Output Voltage | Fixed 3.3V ±1% - eliminates external feedback resistors and ensures stable logic-level rail for microcontrollers and sensors. |
| Switching Frequency | 2.25MHz ±20% - enables compact 2.2µH inductors and reduces EMI filtering requirements in space-constrained PCBs. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on emergency radios and portable handheld scanners. |
| Output Current | 1A continuous - sufficient for powering dual-core ARM Cortex-M7 MCUs with peripherals under full load. |
| Thermal Rating | Junction temperature range –40°C to +150°C - qualified for under-hood automotive applications per AEC-Q100 Grade H. |
| PGOOD Accuracy | ±7.5% output window with 32-cycle blanking - prevents false fault assertions during transient load steps in embedded computing. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed pad (Pin 9 = GND), θJA = 40°C/W, θJC = 10°C/W, TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connects to inductor; carries high di/dt switching current - requires tight layout and Kelvin connection for stability. |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - bypass with ≥10µF ceramic capacitor near pin. |
| RUN (Pin 3) | Enable Control | Active-high logic input; pulls low to disable regulator and reduce IQ to 0.1µA - must not float. |
| FB (Pin 5) | Feedback Reference | Internally tied to 3.3V output; no external divider needed - simplifies layout and improves noise immunity. |
| INTVCC (Pin 6) | Internal LDO Output | 3.6V regulated supply for gate drivers and analog circuitry - bypass with ≥1µF ceramic to SGND. |
| MODE/SYNC (Pin 7) | Operating Mode Select | Tie to INTVCC for Burst Mode (low IQ), GND for pulse-skipping (low ripple), or external clock for synchronization. |
| PGOOD (Pin 4) | Power Good Indicator | Open-drain output pulled high when VOUT within ±7.5%; 275Ω pull-down when out-of-regulation. |
| SGND (Pin 8) | Signal Ground | Dedicated low-noise ground return for FB, MODE/SYNC, and PGOOD - separate from power GND (exposed pad). |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for battery-backed IoT edge nodes. |
| Integrated Power Switches | 0.37Ω PMOS top FET + 0.15Ω NMOS bottom FET - eliminates external MOSFETs and gate drivers, reducing BOM count. |
| PGOOD with Blanking Delay | 32-cycle blanking prevents false trips during dynamic load transients - improves system reliability in motor-control interfaces. |
| AEC-Q100 Qualified | H-grade (–40°C to +150°C) qualification - meets automotive electronics stress testing requirements for engine control modules. |
| Internal Soft-Start | 800µs ramp time - limits inrush current during startup and avoids input voltage droop in shared power domains. |
Applications
| Automotive Infotainment | Industrial Sensor Node |
|---|---|
|
Use Scenario: Powering display controller, audio codec, and CAN transceiver in vehicle head unit. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator delivering 1A with fast transient response to bursty multimedia workloads. Use Value: 2.25MHz switching enables small 2.2µH inductor and 22µF ceramic output cap - saves >30% board area vs. 500kHz solutions. |
Use Scenario: Supplying ultra-low-power MCU, RF transceiver, and analog front-end in wireless vibration sensor. IC Role / Device Role / Timing Role: Always-on 3.3V rail with 3.5µA quiescent current in Burst Mode - extends 2xAA battery life to >5 years. Use Value: ±1% output accuracy ensures ADC reference stability and digital logic margin compliance across temperature. |
| Emergency Radio System | Embedded Computing Module |
|
Use Scenario: Providing regulated 3.3V to SDR baseband processor and audio amplifier in portable emergency radio. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from 7.2V Li-ion pack with dropout capability down to 3.6V. Use Value: Full-dropout operation with low IQ preserves usable battery capacity until final 10% state-of-charge. |
Use Scenario: Generating 3.3V for FPGA configuration, DDR memory interface, and PCIe controller in ruggedized edge server. IC Role / Device Role / Timing Role: Thermally robust MS8E package with exposed pad dissipates heat directly to PCB - sustains 1A at +85°C ambient. Use Value: Dedicated SGND pin isolates sensitive analog feedback from noisy digital ground returns - improves PSRR by >20dB. |
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, 3.3V fixed, 2.25MHz, 1.2A, but only rated to 125°C junction and lacks PGOOD blanking. | Suitable for commercial industrial controllers but not AEC-Q100 automotive use cases. | Select when cost sensitivity outweighs automotive qualification and PGOOD timing precision. |
| MP2315GJ-Z | 4.5V–28V input, 3.3V fixed, 2MHz, 1.5A, no PGOOD, no Burst Mode, 15µA IQ, MSOP-8 package. | Targeted at higher-VIN industrial power supplies where 3.5µA IQ is not required. | Choose for 24V rail compatibility and higher current margin, accepting higher light-load power loss. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621HMS8E-3.3#PBF uniquely combines AEC-Q100 H-grade qualification, 3.5µA quiescent current, PGOOD blanking, and dedicated SGND - making it the only option for safety-critical automotive and long-life battery-powered embedded systems demanding both precision and ruggedness.
Availability
LTC3621HMS8E-3.3#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and emergency radio systems requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for LTC3621HMS8E-3.3#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 product line delivers high-efficiency, low-IQ monolithic buck regulators optimized for battery-powered and automotive applications where thermal robustness, precision regulation, and functional safety are critical.
FAQ
What is the maximum junction temperature rating for the LTC3621HMS8E-3.3#PBF?
The LTC3621HMS8E-3.3#PBF is rated for operation up to +150°C junction temperature and is qualified per AEC-Q100 Grade H. This specification is confirmed in the Absolute Maximum Ratings table and applies across the full –40°C to +150°C operating range. The MS8E package's θJA of 40°C/W enables reliable 1A operation at +85°C ambient with appropriate PCB copper area.
Does the LTC3621HMS8E-3.3#PBF require external feedback resistors?
No, the LTC3621HMS8E-3.3#PBF has a factory-trimmed fixed 3.3V output. The FB pin is internally connected to the output, eliminating the need for external resistive dividers. This configuration is explicitly defined in the ORDER INFORMATION table and Electrical Characteristics section for the -3.3 suffix variants.
How does the PGOOD pin behave during output load transients on the LTC3621HMS8E-3.3#PBF?
The LTC3621HMS8E-3.3#PBF asserts PGOOD high when VOUT is within ±7.5% of 3.3V and holds it high for 32 switching cycles after falling out of regulation. This blanking delay prevents false fault signals during typical load-step events, as documented in the Pin Functions and Applications Information sections.
Can the LTC3621HMS8E-3.3#PBF be synchronized to an external clock?
Yes, the MODE/SYNC pin accepts an external clock signal within ±40% of the internal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz). When engaged, the device enters forced continuous mode and locks to the external frequency within 2–3 cycles, as specified in the Frequency Sync Capability section.
What is the purpose of the SGND pin on the LTC3621HMS8E-3.3#PBF?
The SGND (Pin 8) provides a dedicated low-noise signal ground return path for the FB, MODE/SYNC, and PGOOD pins. It is electrically isolated from the power GND (exposed pad, Pin 9) to prevent switching noise coupling into sensitive analog circuits - a key design feature confirmed in the Pin Functions table and Block Diagram.
LTC3621HMS8E-3.3#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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621HMS8E-3.3#PBF FAQ
1.How can I place an order for LTC3621HMS8E-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621HMS8E-3.3#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-3.3#PBF reliable?
The price and inventory of LTC3621HMS8E-3.3#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-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621HMS8E-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621HMS8E-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621HMS8E-3.3#PBF?
LTC3621HMS8E-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621HMS8E-3.3#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-3.3#PBF?
For technical support, including LTC3621HMS8E-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621HMS8E-3.3#PBF requirements.
6.How does Aetrix verify that LTC3621HMS8E-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621HMS8E-3.3#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-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621HMS8E-3.3#PBF?
All LTC3621HMS8E-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621HMS8E-3.3#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-3.3#PBF part is unused and in its original packaging.
Return procedure for LTC3621HMS8E-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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