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Analog Devices Inc. LTC3621IMS8E-3.3#TRPBF
- Part No.:
- LTC3621IMS8E-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621IMS8E-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,495
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Product details
Overview
LTC3621IMS8E-3.3#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, ±1% output voltage accuracy, and operation across 2.7V–17V input range - used in automotive infotainment power rails and portable handheld scanners requiring low-noise, high-efficiency DC/DC conversion.
For engineers reviewing the LTC3621IMS8E-3.3#TRPBF datasheet, LTC3621IMS8E-3.3#TRPBF pinout, LTC3621IMS8E-3.3#TRPBF application, or LTC3621IMS8E-3.3#TRPBF equivalent, key selection criteria include its MS8E package with independent SGND and PGOOD pins, Burst Mode® vs pulse-skipping trade-offs, dropout behavior at high duty cycle, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC3621IMS8E-3.3#TRPBF implements a constant-frequency peak current mode control architecture with internal compensation, enabling stable regulation across wide VIN and load transients. Its 2.25MHz switching frequency supports compact 2.2µH inductors and ceramic capacitors while maintaining >90% efficiency at 1A with 3.3V output.
It features three selectable operating modes via the MODE/SYNC pin: Burst Mode® (3.5µA IQ, 400mA clamp), pulse-skipping (low VOUT ripple), and forced continuous (no subharmonic noise). The MS8E package integrates dedicated SGND and PGOOD pins, with PGOOD asserting high when VOUT remains within ±7.5% of 3.3V for ≥32 clock cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (0.033V tolerance) - eliminates external feedback divider and ensures precise rail generation for MCU I/O or USB PHY supplies. |
| Switching Frequency | 2.25MHz ±20% - enables use of small 2.2µH inductors and reduces EMI filtering burden in space-constrained industrial and automotive PCBs. |
| Quiescent Current | 3.5µA in Burst Mode® - extends battery life in emergency radios and portable scanners during standby without compromising wake-up response. |
| Input Voltage Range | 2.7V to 17V - supports direct connection to 12V automotive batteries (with transient tolerance) and single-cell Li+ or multi-cell alkaline inputs. |
| Output Current | 1A continuous - sufficient to power ARM Cortex-M7 microcontrollers, CAN transceivers, and display drivers in embedded computing systems. |
| Thermal Performance | θJA = 40°C/W (MS8E) - allows full 1A operation at TA ≤ 85°C with minimal copper area, simplifying thermal design in sealed enclosures. |
| Protection Features | Overtemperature shutdown, VIN overvoltage lockout (19V trip), undervoltage lockout (2.7V), and PGOOD monitoring - ensures robust operation in harsh automotive environments. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8E) with exposed pad (Pin 9 = GND), rated for –40°C to 125°C junction temperature. Thermally enhanced layout requires soldering exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square wave - must be routed with minimal loop area to reduce EMI and MOSFET switching loss. |
| VIN (Pin 2) | Power input | Accepts 2.7V–17V; feeds internal LDO (INTVCC) and power switches - requires local 10µF ceramic bypass close to pin. |
| RUN (Pin 3) | Enable control | Active-high logic input; <0.3V disables regulator, >1.0V enables - pulled high via resistor for always-on operation or driven by MCU GPIO. |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output; pulls high when VOUT is within ±7.5% of 3.3V for ≥32 cycles - used for system power sequencing and fault detection. |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for gate drivers and logic; bypass with ≥1µF ceramic to GND - powers MODE/SYNC and FB circuitry. |
| MODE/SYNC (Pin 7) | Mode selection / clock sync | Configures Burst Mode® (tied to INTVCC), pulse-skipping (GND), or forced continuous (1V–2.4V); accepts external 1.35–3.15MHz sync clock. |
| SGND (Pin 8) | Signal ground | Dedicated low-noise reference for FB, MODE/SYNC, and PGOOD - must be connected to analog ground plane, separate from power GND if possible. |
| GND (Pin 9, Exposed Pad) | Power and thermal ground | Main return path for SW, VIN, and internal FETs; provides thermal conduction - must be soldered to large PCB copper area for θJC = 10°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for battery-powered emergency radios needing multi-week standby. |
| Independent SGND Pin | Isolates sensitive analog feedback paths from noisy power return currents - improves output voltage accuracy and transient response in mixed-signal systems. |
| PGOOD with Blanking Delay | 32-cycle delay prevents false trips during load transients - ensures reliable power sequencing in automotive ECUs where VOUT dips momentarily under motor load switching. |
| AEC-Q100 Qualified | Rated for automotive temperature range (–40°C to 125°C) with controlled manufacturing - meets reliability requirements for infotainment and ADAS subsystems. |
| 2.25MHz Synchronization | ±40% sync range (1.35–3.15MHz) enables EMI reduction by aligning switching to system clocks - avoids interference with CAN FD or Ethernet PHY frequencies. |
Applications
| Automotive Infotainment | Portable Handheld Scanners |
|---|---|
|
Use Scenario: Powering SoC core logic, display interface, and audio codec in vehicle head units with 12V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary 3.3V buck converter supplying processor I/O and peripheral rails with fast load-step response and low conducted noise. Use Value: 2.25MHz operation minimizes filter size; PGOOD enables safe boot sequencing; AEC-Q100 compliance ensures field reliability. |
Use Scenario: Battery-powered barcode scanner requiring long runtime and instant wake-up from deep sleep between scans. IC Role / Device Role / Timing Role: Main system regulator converting single Li+ cell (3.0–4.2V) or dual alkaline (3.0–3.6V) to stable 3.3V for MCU and imager. Use Value: 3.5µA Burst Mode® IQ extends battery life to >100 hours; high efficiency at light loads preserves capacity during idle periods. |
| Industrial Embedded Computing | Emergency Radio Systems |
|
Use Scenario: Powering ARM-based edge controllers in factory automation with wide-input 24VDC rails and thermal constraints. IC Role / Device Role / Timing Role: Compact 3.3V point-of-load regulator supporting FPGA configuration, Ethernet PHY, and sensor interfaces. Use Value: MS8E package with exposed pad delivers 1A with minimal heatsinking; ±1% accuracy ensures reliable digital logic operation. |
Use Scenario: Critical backup communication device powered by AA/AAA batteries, requiring guaranteed operation down to 2.7V input. IC Role / Device Role / Timing Role: Primary DC/DC converter enabling full functionality across entire battery discharge curve, including end-of-life voltage. Use Value: Full dropout operation at 100% duty cycle maintains 3.3V output even as VIN drops to 3.3V; UVLO at 2.7V prevents brownout crashes. |
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, 3.5µA IQ, 2.25MHz, 3A output - higher current but no fixed 3.3V option or PGOOD in 8-pin VSON. | Requires external feedback resistors; lacks dedicated SGND and automotive qualification - better suited for non-automotive 3A applications. | Select when higher output current or adjustable VOUT is needed; avoid when AEC-Q100 or PGOOD sequencing is mandatory. |
| MP2315GJ-Z | 4.5V–28V input, fixed 3.3V output, 25µA IQ, 2MHz, 1.5A output - wider VIN but 7× higher quiescent current and no sync capability. | No Burst Mode®, no PGOOD, no AEC-Q100 rating - suitable for cost-sensitive industrial use but not battery or automotive. | Select for high-VIN industrial apps where low IQ and automotive compliance are not required; verify thermal margin at 1A. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621IMS8E-3.3#TRPBF uniquely combines AEC-Q100 qualification, integrated PGOOD with blanking, independent SGND, and 3.5µA Burst Mode® IQ in an MS8E package - making it the only choice for safety-critical automotive and ultra-low-power portable designs requiring fixed 3.3V.
Availability
LTC3621IMS8E-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, portable handheld scanners, industrial embedded computing, and emergency radio systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3621IMS8E-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC3621IMS8E-3.3#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC regulators designed specifically for space-constrained, low-IQ, and automotive-grade applications demanding reliability under extreme thermal and electrical conditions.
FAQ
What is the maximum output current capability of the LTC3621IMS8E-3.3#TRPBF?
The LTC3621IMS8E-3.3#TRPBF delivers up to 1A of continuous output current at 3.3V with proper PCB thermal design. Its peak current limit is specified as 1.6A (typical) across the –40°C to 125°C junction temperature range, ensuring robust overload handling without foldback or shutdown under transient conditions.
Does the LTC3621IMS8E-3.3#TRPBF require external feedback resistors?
No, the LTC3621IMS8E-3.3#TRPBF is a fixed-output variant with internally trimmed 3.3V regulation - the FB pin is internally connected to the output, eliminating external resistors. This simplifies layout, improves accuracy, and reduces BOM count compared to adjustable versions like the LTC3621IMS8E#TRPBF.
How does the PGOOD function work on the LTC3621IMS8E-3.3#TRPBF?
The LTC3621IMS8E-3.3#TRPBF asserts PGOOD high when VOUT remains within ±7.5% of 3.3V (i.e., 3.05V–3.55V) for at least 32 consecutive switching cycles. It pulls low immediately upon exit from regulation, with a built-in blanking delay to prevent false triggering during load transients - essential for reliable power sequencing in automotive ECUs.
Can the LTC3621IMS8E-3.3#TRPBF synchronize to an external clock?
Yes, the LTC3621IMS8E-3.3#TRPBF supports external clock synchronization via the MODE/SYNC pin across a ±40% range of its nominal 2.25MHz frequency (1.35–3.15MHz). When synchronized, it operates in forced continuous mode and locks to the external clock within 2–3 cycles - useful for EMI reduction in noise-sensitive systems.
What is the thermal resistance of the LTC3621IMS8E-3.3#TRPBF in the MS8E package?
The LTC3621IMS8E-3.3#TRPBF in the MS8E package has θJA = 40°C/W (measured on standard 2-layer JEDEC board) and θJC = 10°C/W. Achieving these values requires soldering the exposed pad (Pin 9) to a minimum 100mm² copper area on the PCB - enabling full 1A operation at ambient temperatures up to 85°C without additional heatsinking.
LTC3621IMS8E-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621IMS8E-3.3#TRPBF FAQ
1.How can I place an order for LTC3621IMS8E-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IMS8E-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 LTC3621IMS8E-3.3#TRPBF reliable?
The price and inventory of LTC3621IMS8E-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 LTC3621IMS8E-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IMS8E-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IMS8E-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IMS8E-3.3#TRPBF?
LTC3621IMS8E-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IMS8E-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 LTC3621IMS8E-3.3#TRPBF?
For technical support, including LTC3621IMS8E-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IMS8E-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3621IMS8E-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IMS8E-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 LTC3621IMS8E-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IMS8E-3.3#TRPBF?
All LTC3621IMS8E-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IMS8E-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 LTC3621IMS8E-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621IMS8E-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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