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Analog Devices Inc. LTC3621HMS8E-3.3#TRPBF
- Part No.:
- LTC3621HMS8E-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621HMS8E-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,792
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Product details
Overview
LTC3621HMS8E-3.3#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in thermally enhanced MSOP-8 (MS8E) package with integrated power MOSFETs, fixed 3.3V output, 1MHz switching frequency, ±1% output voltage accuracy, and 3.5µA quiescent current in shutdown - deployed in automotive infotainment power rails and industrial sensor nodes requiring ultra-low IQ and AEC-Q100-compliant operation.
For engineers reviewing the LTC3621HMS8E-3.3#TRPBF datasheet, LTC3621HMS8E-3.3#TRPBF pinout, LTC3621HMS8E-3.3#TRPBF application, or LTC3621HMS8E-3.3#TRPBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for high-reliability 3.3V point-of-load conversion under wide input (2.7V–17V) and extended temperature (–40°C to +150°C) conditions.
Technical Context
The LTC3621HMS8E-3.3#TRPBF implements a constant-frequency peak current mode control architecture with internal compensation, enabling stable regulation across 2.7V–17V input while delivering up to 1A at fixed 3.3V. Its 1MHz switching frequency supports compact external components, and the MODE/SYNC pin enables selection among Burst Mode (3.5µA IQ), pulse-skipping (low ripple), or forced continuous operation.
It integrates independent SGND and PGOOD pins in the MS8E package, supports full dropout operation down to VIN = VOUT, and features overtemperature protection plus VIN overvoltage lockout (19V rising threshold). The H-grade junction temperature rating (–40°C to +150°C) and AEC-Q100 qualification confirm suitability for under-hood automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports direct connection to 12V automotive battery with transient tolerance. |
| Output Voltage | Fixed 3.3V ±1% - eliminates external feedback resistors; ensures precise MCU/SoC core rail compliance. |
| Max Output Current | 1A - sufficient for powering ARM Cortex-M7 microcontrollers or dual-band Wi-Fi modules. |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on emergency radio or telematics modules. |
| Switching Frequency | 1.00MHz ±8% (H-grade) - enables use of ≤2.2µH inductors and reduces EMI filter size. |
| Thermal Rating | Junction temp range –40°C to +150°C - qualified for engine control unit (ECU) and ADAS camera power stages. |
| Protection Features | Overtemperature, VIN OVLO (19V), UVLO (2.7V), and PGOOD monitoring - enables robust fault reporting in safety-critical systems. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND); thermally enhanced for θJA = 40°C/W and TJMAX = 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection to inductor; carries high di/dt square wave - requires tight layout and Kelvin routing to minimize EMI. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - bypass with ≥10µF ceramic close to 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 BOM and improves accuracy vs adjustable versions. |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for gate drivers and logic - bypass with ≥1µF ceramic to GND. |
| MODE/SYNC (Pin 7) | Operating mode select | Tie to INTVCC for Burst Mode (ultra-low IQ), GND for pulse-skipping (low ripple), or external clock for sync - enables dynamic efficiency/ripple trade-off. |
| PGOOD (Pin 4) | Power good indicator | Open-drain output pulled high when VOUT is within ±7.5% of 3.3V - provides system-level power sequencing signal. |
| SGND (Pin 8) | Signal ground | Dedicated low-noise ground return for FB, MODE/SYNC, and PGOOD - separate from power GND (exposed pad) to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | H-grade device certified for automotive applications including engine control and ADAS sensors. |
| Integrated Power FETs | Top PMOS + bottom NMOS switches eliminate external MOSFETs and gate drivers - reduces solution size by >40% vs controller-based designs. |
| Independent SGND Pin | Separates analog reference ground from power ground - improves load transient response and output voltage accuracy in noisy environments. |
| PGOOD with Blanking Delay | 32-cycle blanking on PGOOD falling edge prevents false fault triggers during fast load transients - enhances system reliability in burst-mode operation. |
| Full Dropout Operation | Maintains regulation down to VIN = VOUT with low IQ - enables seamless transition during cold-crank (6.5V) or brownout conditions in automotive systems. |
Applications
| Automotive Infotainment | Industrial Sensor Node |
|---|---|
Use Scenario: Powering SoC, display interface, and audio codec in head-unit systems operating from 12V battery with cold-crank dips to 6.5V. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator with PGOOD signaling for system power sequencing and fault detection. Use Value: AEC-Q100 H-grade rating and 150°C junction capability ensure uninterrupted operation under hood temperatures; 3.5µA shutdown IQ preserves battery during vehicle sleep mode. | Use Scenario: Supplying 3.3V to low-power wireless sensor (LoRaWAN/NB-IoT) in remote factory monitoring equipment with 10-year battery life target. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current buck converter enabling multi-year operation on primary lithium thionyl chloride cells. Use Value: 3.5µA shutdown IQ and Burst Mode efficiency >85% at 100µA load extend battery life beyond 10 years; wide VIN accommodates aging battery discharge curve. |
| Emergency Radio System | Embedded Computing Module |
Use Scenario: Providing regulated 3.3V to RF transceiver and microcontroller in portable emergency radios powered by AA/AAA alkaline batteries. IC Role / Device Role / Timing Role: Main DC-DC converter supporting variable input (0.9V–12V per battery configuration) and maintaining stable 3.3V output during transmit bursts. Use Value: Full dropout operation allows regulation down to VIN = 3.3V - critical for deep battery discharge; 1MHz switching enables small 1.5µH inductor and compact PCB area. | Use Scenario: Generating 3.3V for FPGA I/O banks and peripheral interfaces in ruggedized edge computing modules used in transportation and energy infrastructure. IC Role / Device Role / Timing Role: High-reliability, thermally robust POL regulator with PGOOD monitoring for system health diagnostics. Use Value: MS8E package with exposed GND pad achieves θJA = 40°C/W - sustains 1A load at +85°C ambient without derating; PGOOD enables firmware-driven power health checks. |
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, 3.5µA IQ, but only rated to 125°C junction and lacks PGOOD/SGND separation. | Suitable for commercial industrial controls but not AEC-Q100 automotive deployments. | Select when cost sensitivity outweighs extended temperature and automotive qualification requirements. |
| MP2315GJ-Z | 4.5V–24V input, 3.3V fixed, 25µA IQ, no PGOOD, no SGND, 125°C max junction - lower IQ spec but wider VIN and no automotive qualification. | Fits general-purpose 3.3V loads where input exceeds 17V or ambient stays below 85°C. | Choose for non-automotive applications needing higher VIN tolerance and lower BOM cost, accepting reduced accuracy and no fault reporting. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621HMS8E-3.3#TRPBF uniquely combines AEC-Q100 H-grade qualification, dedicated SGND, PGOOD with blanking, and guaranteed 3.5µA IQ across –40°C to +150°C - making it the only option for safety-aware automotive and extended-temperature industrial power rails.
Availability
LTC3621HMS8E-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and emergency radio platforms requiring stable component supply with long-term lifecycle support and AEC-Q100 compliance.
Supply support for LTC3621HMS8E-3.3#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3621 product line delivers high-efficiency, ultralow-quiescent-current monolithic buck regulators optimized for battery-powered and automotive applications where thermal robustness, accuracy, and reliability are critical.
FAQ
What is the maximum junction temperature specification for the LTC3621HMS8E-3.3#TRPBF?
The LTC3621HMS8E-3.3#TRPBF is specified for operation up to +150°C junction temperature and is qualified per AEC-Q100 Grade 0 (–40°C to +150°C). This H-grade rating is confirmed in the official Analog Devices datasheet Rev. D, Order Information table, and Absolute Maximum Ratings section - distinguishing it from E/I-grade variants limited to 125°C.
Does the LTC3621HMS8E-3.3#TRPBF require external feedback resistors to set its output voltage?
No. The LTC3621HMS8E-3.3#TRPBF has an internally trimmed fixed 3.3V output; the FB pin is pre-connected to the output internally. External resistors are unnecessary - unlike adjustable versions such as LTC3621HMS8E#TRPBF - reducing component count and improving accuracy by eliminating resistor tolerance errors.
How does the PGOOD function behave on the LTC3621HMS8E-3.3#TRPBF during output load transients?
The LTC3621HMS8E-3.3#TRPBF asserts PGOOD high when VOUT is within ±7.5% of 3.3V and includes a 32-switching-cycle blanking delay on the falling edge. This prevents false low assertions during fast load steps - a design feature explicitly documented in the Applications Information section of the datasheet for reliable system sequencing.
Can the LTC3621HMS8E-3.3#TRPBF synchronize to an external clock, and what is its sync range?
Yes. The MODE/SYNC pin of the LTC3621HMS8E-3.3#TRPBF accepts an external clock signal and synchronizes the internal oscillator within ±40% of its nominal 1MHz frequency (i.e., 600kHz to 1.4MHz). Sync engagement occurs within 2–3 external clock cycles, and loss of sync reverts to free-running mode in ~7µs - details confirmed in the Frequency Sync Capability section of the datasheet.
What is the purpose of the SGND pin on the LTC3621HMS8E-3.3#TRPBF, and how should it be routed?
The SGND (Signal Ground) pin on the LTC3621HMS8E-3.3#TRPBF provides a dedicated low-noise ground return path for sensitive analog circuitry - specifically the FB, MODE/SYNC, and PGOOD pins. It must be routed separately from the power GND (exposed pad) and connected to a clean analog ground plane to preserve feedback accuracy and prevent noise coupling into regulation loops.
LTC3621HMS8E-3.3#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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3621HMS8E-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621HMS8E-3.3#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 LTC3621HMS8E-3.3#TRPBF reliable?
The price and inventory of LTC3621HMS8E-3.3#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621HMS8E-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621HMS8E-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621HMS8E-3.3#TRPBF?
LTC3621HMS8E-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621HMS8E-3.3#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 LTC3621HMS8E-3.3#TRPBF?
For technical support, including LTC3621HMS8E-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621HMS8E-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3621HMS8E-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621HMS8E-3.3#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 LTC3621HMS8E-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621HMS8E-3.3#TRPBF?
All LTC3621HMS8E-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621HMS8E-3.3#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 LTC3621HMS8E-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621HMS8E-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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