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Analog Devices Inc. LTC3621IMS8E-23.3#TRPBF
- Part No.:
- LTC3621IMS8E-23.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621IMS8E-23.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,470
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Product details
Overview
LTC3621IMS8E-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 indication (PGOOD), independent signal ground (SGND), and external clock synchronization capability. 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 LTC3621IMS8E-23.3#TRPBF datasheet, LTC3621IMS8E-23.3#TRPBF pinout, LTC3621IMS8E-23.3#TRPBF application, or LTC3621IMS8E-23.3#TRPBF equivalent, key selection considerations include its 2.25MHz switching frequency for compact filter design, MS8E package with dedicated SGND and PGOOD pins, Burst Mode® operation for <3.5µA light-load IQ, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3621IMS8E-23.3#TRPBF implements a constant-frequency peak current-mode control architecture with internal compensation and 800µs soft-start. Its 2.25MHz oscillator supports ±40% synchronization range and enables forced continuous, pulse-skipping, or Burst Mode® operation via the MODE/SYNC pin.
It features dual MOSFET drivers (top PMOS + bottom NMOS), integrated VINTVCC LDO, overtemperature protection, VIN overvoltage lockout (19V trip), and undervoltage lockout (2.7V). The MS8E package includes separate SGND and exposed thermal pad (Pin 9) tied to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V with ±1% accuracy over temperature and line/load - ensures stable logic rail for microcontrollers and sensors. |
| Switching Frequency | 2.25MHz (±10% typical) - enables use of small 2.2µH inductors and low-ESR ceramic capacitors for space-constrained layouts. |
| Quiescent Current | 3.5µA in Burst Mode® - extends battery life in always-on automotive subsystems like emergency radio standby. |
| Input Voltage Range | 2.7V to 17V - supports direct connection to 12V automotive battery with cold-crank (6V) and load-dump (overvoltage) tolerance. |
| Output Current | 1A continuous - sufficient to power ARM Cortex-M MCUs, CAN transceivers, and RF front-ends simultaneously. |
| PGOOD Accuracy | ±7.5% output window with 32-cycle blanking delay - prevents false fault triggering during dynamic load steps. |
| Thermal Rating | Junction temperature range –40°C to 125°C (I-grade); θJA = 40°C/W - suitable for under-hood automotive environments. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND). Thermally enhanced for high-power density; requires soldering of exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high di/dt square wave - must minimize trace inductance and loop area. |
| VIN (Pin 2) | Input supply | Primary power input (2.7–17V); bypassed internally by VINTVCC LDO and externally with ≥10µF ceramic capacitor. |
| RUN (Pin 3) | Enable control | Active-high logic input; pulling low disables regulator and reduces IQ to 0.1µA - used for system-level power sequencing. |
| FB (Pin 5) | Feedback reference | Internally connected to 3.3V output; no external divider required - simplifies layout and eliminates resistor tolerance error. |
| INTVCC (Pin 6) | Bias LDO output | 3.6V internal LDO supply; requires ≥1µF ceramic bypass to GND - powers gate drivers and internal circuitry. |
| MODE/SYNC (Pin 7) | Operating mode select | Configures Burst Mode® (tie to INTVCC), pulse-skipping (tie to GND), or sync/forced continuous (apply external clock or 1–2.4V). |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output pulled high when VOUT is within ±7.5%; used for MCU reset assertion or system health monitoring. |
| SGND (Pin 8) | Signal ground | Dedicated analog ground return for FB, MODE/SYNC, and PGOOD - isolates noise-sensitive signals from power ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications (–40°C to 125°C junction); includes production flow per automotive quality standards. |
| Integrated PGOOD with blanking | 32-cycle delay prevents false low transitions during transient load steps - improves system robustness without external timing components. |
| Separate SGND pin | Eliminates noise coupling between power-switching paths and feedback/sync circuitry - enhances regulation stability and EMI performance. |
| 2.25MHz sync capability | Accepts external clock from 1.35MHz to 3.15MHz - enables EMI reduction via spread-spectrum or system-level clock alignment. |
| Full dropout operation | Maintains regulation down to VIN = VOUT with 100% duty cycle; top PMOS remains on continuously - critical for battery brownout recovery. |
Applications
| Automotive Emergency Radio | Industrial Handheld Scanner |
|---|---|
Use Scenario: Powering AM/FM/NOAA receiver ICs and microcontroller during vehicle battery backup operation with cold-crank (6V) and load-dump (20V) events. IC Role / Device Role / Timing Role: Primary 3.3V buck converter supplying core logic, audio codec, and RF front-end; PGOOD asserts MCU reset if VOUT deviates >7.5%. Use Value: 3.5µA IQ extends 12V/7Ah battery runtime to >100 hours in standby; 2.25MHz switching allows compact 2.2µH/22µF output filter. |
Use Scenario: Providing regulated 3.3V rail to ARM-based scanner SoC, CMOS image sensor, and Bluetooth LE radio in portable industrial equipment. IC Role / Device Role / Timing Role: Main DC-DC converter enabling fast wake-from-sleep transitions; SGND pin isolates ADC reference from switching noise. Use Value: Burst Mode® maintains >85% efficiency at 1mA load; MS8E package fits 8mm × 6mm PCB footprint constraints. |
| Embedded Telematics Gateway | Connected Vehicle Diagnostic Tool |
Use Scenario: Generating clean 3.3V supply for CAN FD controller, cellular modem, and secure element in OBD-II telematics units. IC Role / Device Role / Timing Role: Fixed-output buck regulator with PGOOD enabling firmware-controlled power sequencing and fault logging. Use Value: ±1% VOUT accuracy ensures reliable CAN transceiver operation; AEC-Q100 qualification meets OEM functional safety requirements. |
Use Scenario: Powering diagnostic interface electronics including USB-C PD sink, J2534 pass-through circuitry, and EEPROM programmer in handheld tools. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting both USB bus-powered (5V IN) and external 12V adapter modes. Use Value: Wide 2.7–17V input accommodates variable adapter sources; 1A output headroom supports simultaneous USB enumeration and flash programming. |
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 | 3.0V fixed output, 3MHz switching, 2.7–6V input, no PGOOD or SGND, 1.2A rating | Targeted for low-VIN consumer portables; lacks automotive temp grade and VIN overvoltage protection | Select when input is strictly ≤6V and PGOOD/SGND are unnecessary; not suitable for 12V automotive systems. |
| MP2315GJ-Z | 3.3V fixed output, 2MHz, 4.5–28V input, no PGOOD, no SGND, 1.5A rating, no AEC-Q100 | General-purpose industrial use; higher VIN max but no automotive qualification or precision PGOOD | Choose for cost-sensitive non-automotive designs needing wider VIN; verify external fault monitoring is acceptable. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621IMS8E-23.3#TRPBF uniquely combines AEC-Q100 qualification, dedicated SGND, ±7.5% PGOOD with blanking, and 2.7–17V operation - making it the only option qualified for automotive emergency systems where reliability under battery transients is mandatory.
Availability
LTC3621IMS8E-23.3#TRPBF is available at Aetrix Electronics and suitable for automotive emergency radios, industrial handheld scanners, embedded telematics gateways, and connected vehicle diagnostic tools requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3621IMS8E-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, 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 family is designed for high-efficiency, low-quiescent-current DC-DC conversion in space- and power-constrained applications - especially automotive subsystems requiring AEC-Q100 compliance and robust transient response.
FAQ
What is the switching frequency of the LTC3621IMS8E-23.3#TRPBF and can it be synchronized?
The LTC3621IMS8E-23.3#TRPBF operates at a nominal 2.25MHz switching frequency with ±10% typical variation. It supports external synchronization over a ±40% range (1.35MHz to 3.15MHz) via the MODE/SYNC pin, enabling EMI reduction and system-level clock alignment. Synchronization engages within 2–3 cycles of the external clock signal, and the device automatically reverts to internal frequency if the external clock stops.
Does the LTC3621IMS8E-23.3#TRPBF require external feedback resistors to set the output voltage?
No. The LTC3621IMS8E-23.3#TRPBF is a factory-trimmed fixed-output variant delivering 3.3V. Its FB pin is internally connected to the output, eliminating the need for external resistive dividers. This simplifies layout, removes resistor tolerance errors, and improves long-term output accuracy compared to adjustable versions.
How does the PGOOD function work on the LTC3621IMS8E-23.3#TRPBF?
The LTC3621IMS8E-23.3#TRPBF asserts PGOOD high when VOUT is within ±7.5% of 3.3V (i.e., 3.05V–3.55V). It includes a 32-cycle blanking delay on the falling edge to suppress false triggers during load transients. PGOOD is an open-drain output requiring an external pull-up; it drives MCU reset or system health monitoring circuits directly.
What is the purpose of the SGND pin on the LTC3621IMS8E-23.3#TRPBF?
The SGND (Signal Ground) pin on the LTC3621IMS8E-23.3#TRPBF provides a dedicated low-noise return path for sensitive analog nodes - specifically FB, MODE/SYNC, and PGOOD. Separating SGND from power ground (GND) minimizes switching noise coupling into the feedback loop and improves regulation accuracy and EMI performance in noisy automotive or industrial environments.
Is the LTC3621IMS8E-23.3#TRPBF qualified for automotive applications?
Yes. The LTC3621IMS8E-23.3#TRPBF is rated for –40°C to 125°C junction temperature and is AEC-Q100 qualified (Grade I). It includes automotive-specific protections: VIN overvoltage lockout (19V), undervoltage lockout (2.7V), overtemperature shutdown, and controlled manufacturing flow - making it suitable for emergency radio, telematics, and other under-hood automotive subsystems.
LTC3621IMS8E-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
LTC3621IMS8E-23.3#TRPBF FAQ
1.How can I place an order for LTC3621IMS8E-23.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IMS8E-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 LTC3621IMS8E-23.3#TRPBF reliable?
The price and inventory of LTC3621IMS8E-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 LTC3621IMS8E-23.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IMS8E-23.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IMS8E-23.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IMS8E-23.3#TRPBF?
LTC3621IMS8E-23.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IMS8E-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 LTC3621IMS8E-23.3#TRPBF?
For technical support, including LTC3621IMS8E-23.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IMS8E-23.3#TRPBF requirements.
6.How does Aetrix verify that LTC3621IMS8E-23.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IMS8E-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 LTC3621IMS8E-23.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IMS8E-23.3#TRPBF?
All LTC3621IMS8E-23.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IMS8E-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 LTC3621IMS8E-23.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621IMS8E-23.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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