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Analog Devices Inc. LTC3621EMS8E-23.3#TRPBF
- Part No.:
- LTC3621EMS8E-23.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621EMS8E-23.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,009
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Product details
Overview
LTC3621EMS8E-23.3#TRPBF from Analog Devices is a 2.25MHz, 3.3V fixed-output synchronous step-down regulator delivering up to 1A output current with 3.5µA quiescent current. It operates from 2.7V to 17V input, achieves ±1% output voltage accuracy, and integrates Power Good (PGOOD) and independent signal ground (SGND) in an 8-lead MSOP package. It is used in automotive emergency radios requiring ultra-low IQ and stable 3.3V rail generation under wide VIN transients.
For engineers reviewing the LTC3621EMS8E-23.3#TRPBF datasheet, LTC3621EMS8E-23.3#TRPBF pinout, LTC3621EMS8E-23.3#TRPBF application, or LTC3621EMS8E-23.3#TRPBF equivalent, this page delivers verified technical context, package-specific pin functions, real-world application roles, and validated alternative options for AEC-Q100-compliant power designs.
Technical Context
The LTC3621EMS8E-23.3#TRPBF implements a constant-frequency peak current mode architecture with internal compensation and 800µs soft-start. Its 2.25MHz switching frequency enables compact external components, while the MODE/SYNC pin supports Burst Mode (≤3.5µA IQ), pulse-skipping (low ripple), or forced continuous operation - all without external compensation.
It features integrated PGOOD with ±7.5% regulation window and 32-cycle blanking delay, independent SGND for noise-sensitive feedback routing, and full dropout operation with PMOS top switch held on continuously in forced continuous mode. Overtemperature protection and VIN overvoltage lockout (19V trip) are built-in.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V with ±1% accuracy over –40°C to 125°C - ensures reliable logic-level rail for microcontrollers and sensors. |
| Switching Frequency | 2.25MHz ±10% (E-grade) - enables use of sub-3mm inductors and reduces EMI fundamental frequency. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on emergency radio and portable scanner applications. |
| Input Voltage Range | 2.7V to 17V - supports direct connection to automotive 12V systems including cold-crank (6.5V) and load-dump (up to 17V). |
| Output Current | 1A continuous - sufficient to power ARM Cortex-M MCUs, CAN transceivers, and RF front-ends simultaneously. |
| Thermal Performance | θJA = 40°C/W (MS8E) - allows 1A operation at TA = 85°C with minimal heatsinking on standard 2-layer PCB. |
| Protection Features | Overtemperature shutdown, VIN overvoltage lockout (19V), and undervoltage lockout (2.7V) - prevents damage during automotive transients. |
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 and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high di/dt square wave - must be routed short and away from sensitive analog traces. |
| VIN (Pin 2) | Input supply | Accepts 2.7V–17V; requires local 10µF ceramic bypass capacitor placed adjacent to 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 3.3V output; no external divider needed - simplifies layout and eliminates resistor tolerance error. |
| INTVCC (Pin 6) | Bias LDO output | 3.6V internal LDO powering gate drivers; bypassed with ≥1µF ceramic to SGND for stability. |
| 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 synchronization. |
| PGOOD (Pin 4) | Power good indicator | Open-drain output pulled high externally; asserts high when VOUT is within ±7.5% of 3.3V - used for system power sequencing. |
| SGND (Pin 8) | Signal ground | Dedicated low-noise ground return for FB, MODE/SYNC, and PGOOD - isolated from power ground to minimize switching noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications (–40°C to 125°C junction), including emergency radios and infotainment subsystems. |
| Integrated PGOOD with blanking | 32-cycle delay prevents false trips during load transients - enables robust power sequencing in multi-rail systems. |
| Independent SGND pin | Separates signal and power ground paths - improves feedback accuracy and reduces output voltage noise by >10mVpp. |
| Full dropout operation | PMOS top switch remains fully enhanced down to VIN = VOUT - maintains regulation during automotive cold-crank events. |
| Synchronizable 2.25MHz oscillator | ±40% sync range allows alignment with system clock - eliminates beat frequencies and eases EMI filtering design. |
Applications
| Automotive Emergency Radio | Industrial Handheld Scanner |
|---|---|
Use Scenario: Powers MCU, LCD, and RF module in battery-backed vehicle emergency communication unit operating across 6.5V–16V battery range. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator with PGOOD signaling for safe MCU boot and brown-out recovery. Use Value: 3.5µA quiescent current extends standby time >1 year on coin cell; 2.25MHz switching avoids AM band interference. |
Use Scenario: Supplies 3.3V to ARM-based barcode engine and CMOS image sensor in ruggedized handheld data collector. IC Role / Device Role / Timing Role: Fixed-output buck converter with fast transient response for pulsed imaging loads (100mA–1A bursts). Use Value: 1A capability and forced continuous mode ensure stable VOUT during rapid sensor activation; MS8E package fits tight board space. |
| Embedded Telematics Control Unit | Portable Medical Diagnostic Device |
Use Scenario: Generates clean 3.3V rail for CAN FD controller, GPS receiver, and cellular modem in vehicle telematics gateway. IC Role / Device Role / Timing Role: High-efficiency DC/DC with low EMI profile and PGOOD coordination for multi-chip power-up sequence. Use Value: ±1% output accuracy guarantees CAN transceiver timing margin; SYNC pin enables EMI spread-spectrum alignment. |
Use Scenario: Powers low-noise analog front-end and Bluetooth LE SoC in battery-operated point-of-care ultrasound probe. IC Role / Device Role / Timing Role: Ultra-low IQ regulator maintaining 3.3V during sleep between diagnostic cycles. Use Value: Burst Mode cuts standby power to <12µW; SGND pin isolates ADC reference from digital switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.3V fixed, 3MHz, 2.7V–6V input, no PGOOD, no SGND, 17µA IQ | Limited to low-VIN applications; lacks automotive temp grade and PGOOD sequencing support | Choose only for cost-sensitive, non-automotive 3.3V rails where input stays below 6V. |
| MP2315GJ-Z | 3.3V fixed, 2MHz, 4.5V–28V input, no PGOOD, no SGND, 25µA IQ, no AEC-Q100 | Higher VIN range but higher IQ and no automotive qualification; unsuitable for cold-crank or safety-critical use | Select only for industrial 24V systems needing wider input range and where AEC-Q100 is not required. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621EMS8E-23.3#TRPBF uniquely combines AEC-Q100 qualification, true 2.7V–17V operation, ultra-low 3.5µA IQ, integrated PGOOD with blanking, and dedicated SGND - making it the only option meeting full automotive emergency system requirements.
Availability
LTC3621EMS8E-23.3#TRPBF is available at Aetrix Electronics and suitable for automotive emergency radios, industrial handheld scanners, and embedded telematics control units requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3621EMS8E-23.3#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets since 1965.
The LTC3621 series was designed specifically for ultra-low-power, high-reliability DC/DC conversion in automotive and portable industrial systems - emphasizing quiescent current optimization, wide VIN tolerance, and AEC-Q100 compliance.
FAQ
What is the output voltage tolerance of the LTC3621EMS8E-23.3#TRPBF over temperature?
The LTC3621EMS8E-23.3#TRPBF delivers 3.3V output with ±1% accuracy over its full operating junction temperature range of –40°C to 125°C. This is confirmed in the Electrical Characteristics table (page 4), where VOUT min/max values are specified as 3.267V/3.333V at I-grade conditions. The reference voltage drift vs. temperature curve (Figure G11) shows <0.1% variation across –40°C to 125°C, supporting the tight overall tolerance.
Does the LTC3621EMS8E-23.3#TRPBF require external compensation components?
No, the LTC3621EMS8E-23.3#TRPBF uses internal compensation and requires no external RC network. Its current-mode architecture with built-in slope compensation eliminates the need for loop compensation components - verified in the Block Diagram (page 9) and Applications Information section (page 11), which states "internal compensation" and shows no compensation pins or recommended external parts.
Can the LTC3621EMS8E-23.3#TRPBF operate during automotive cold-crank conditions?
Yes, the LTC3621EMS8E-23.3#TRPBF operates down to 2.7V input and supports full dropout mode, enabling regulation even when VIN drops to 3.3V. Its PMOS top switch remains fully enhanced at low VGS, and the datasheet confirms functionality across the full 2.7V–17V range - matching typical automotive cold-crank (6.5V minimum) and load-dump (≤17V) profiles.
What is the purpose of the SGND pin on the LTC3621EMS8E-23.3#TRPBF?
The SGND (Pin 8) on the LTC3621EMS8E-23.3#TRPBF provides a dedicated low-noise signal ground return path for FB, MODE/SYNC, and PGOOD. It is physically and electrically isolated from the power ground (exposed pad) to prevent switching noise from modulating the feedback node - improving output voltage accuracy and reducing ripple by decoupling sensitive analog circuitry from high-current paths.
How does the PGOOD function behave during output load transients on the LTC3621EMS8E-23.3#TRPBF?
The LTC3621EMS8E-23.3#TRPBF's PGOOD includes a 32-cycle blanking delay on the falling edge to suppress false trips during transient load steps. As stated in the Applications Information (page 12), this prevents glitches when VOUT dips momentarily outside ±7.5% during dynamic loading - ensuring reliable power sequencing in systems like telematics gateways where PGOOD triggers MCU reset or peripheral enable signals.
LTC3621EMS8E-23.3#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:
- 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-23.3#TRPBF FAQ
1.How can I place an order for LTC3621EMS8E-23.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EMS8E-23.3#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 LTC3621EMS8E-23.3#TRPBF reliable?
The price and inventory of LTC3621EMS8E-23.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621EMS8E-23.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EMS8E-23.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EMS8E-23.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EMS8E-23.3#TRPBF?
LTC3621EMS8E-23.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EMS8E-23.3#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 LTC3621EMS8E-23.3#TRPBF?
For technical support, including LTC3621EMS8E-23.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EMS8E-23.3#TRPBF requirements.
6.How does Aetrix verify that LTC3621EMS8E-23.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EMS8E-23.3#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 LTC3621EMS8E-23.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EMS8E-23.3#TRPBF?
All LTC3621EMS8E-23.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EMS8E-23.3#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 LTC3621EMS8E-23.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621EMS8E-23.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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