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Analog Devices Inc. LTC3621IMS8E-2#TRPBF
- Part No.:
- LTC3621IMS8E-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621IMS8E-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,790
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Product details
Overview
LTC3621IMS8E-2#TRPBF from Analog Devices is a 2.25MHz, 17V input, 1A synchronous step-down regulator in thermally enhanced MSOP-8 package with independent SGND and PGOOD output. It delivers adjustable 0.6V–VIN output with ±1% accuracy, 3.5µA quiescent current in shutdown, and operates across –40°C to 125°C. Used in automotive emergency radios and portable industrial scanners where low IQ and high-frequency operation minimize external component size.
For engineers reviewing the LTC3621IMS8E-2#TRPBF datasheet, LTC3621IMS8E-2#TRPBF pinout, LTC3621IMS8E-2#TRPBF application, or LTC3621IMS8E-2#TRPBF equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for power supply design in space-constrained, wide-input-voltage systems.
Technical Context
The LTC3621IMS8E-2#TRPBF implements constant-frequency peak current mode control at a factory-set 2.25MHz switching frequency with ±40% synchronization range. Its internal compensation, 800µs soft-start, and dual-mode operation (Burst Mode for <3.5µA IQ, pulse-skipping for low ripple) enable stable regulation across 2.7V–17V input while maintaining 95% peak efficiency.
It integrates PMOS/NMOS synchronous switches with RDS(ON) of 0.37Ω/0.15Ω, supports full dropout operation, and features overtemperature protection plus VIN overvoltage lockout at 19V. The MS8E package includes dedicated SGND and PGOOD pins-critical for noise-sensitive automotive and industrial feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-range battery and industrial bus inputs without pre-regulation |
| Output Voltage Range | 0.6V to VIN - enables direct generation of sub-1V core supplies or adjustable bias rails |
| Switching Frequency | 2.25MHz fixed - allows use of compact 2.2µH inductors and reduces EMI filter size |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on emergency radio and sensor nodes |
| Output Accuracy | ±1% over temperature - ensures reliable microcontroller core voltage compliance |
| Peak Output Current | 1A continuous - sufficient for powering FPGA I/O banks or multi-core MCU subsystems |
| PGOOD Threshold | ±7.5% window - provides precise power-good signaling for system sequencers and watchdogs |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E), thermally enhanced with exposed pad (Pin 9 = GND). Includes dedicated SGND (Pin 8) and PGOOD (Pin 4) pins for noise-isolated feedback and system monitoring.
| 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 routing |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and high-side switch gate drive |
| RUN (Pin 3) | Enable control | Logic-high (>1.0V) activates regulator; must not float - tie to VIN or microcontroller GPIO |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output pulled low if VOUT deviates >±7.5%; blanked for 32 cycles during transients |
| FB (Pin 5) | Feedback input | Senses resistor divider output; regulates VOUT = 0.6V × (1 + R2/R1) with 0.6V reference |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for gate drivers; bypass with ≥1µF ceramic capacitor 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 sync |
| SGND (Pin 8) | Signal ground | Dedicated low-noise return for FB, MODE/SYNC, and PGOOD - separate from power GND path |
| GND (Pin 9, Exposed Pad) | Power and thermal ground | Mandatory PCB solder connection; primary thermal path and high-current return for SW/VIN |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 3.5µA at light loads - critical for battery-powered emergency radios with long standby periods |
| 2.25MHz fixed switching | Enables <2.2µH inductors and <10µF ceramic output caps - shrinks total solution size by >40% vs 1MHz designs |
| Independent SGND pin | Isolates analog feedback paths from power ground noise - improves load transient response and stability |
| PGOOD with 32-cycle blanking | Prevents false fault triggering during dynamic load steps - essential for reliable sequencing in automotive ECUs |
| AEC-Q100 qualified (I-grade) | Validated for –40°C to 125°C operation - meets automotive environmental stress requirements without derating |
Applications
| Portable Emergency Radio | Automotive Body Control Module |
|---|---|
|
Use Scenario: Powering AM/FM receiver, microcontroller, and LED display from 9–16V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary 3.3V/1A buck converter supplying MCU core and RF front-end; PGOOD enables safe boot sequencing. Use Value: 2.25MHz operation avoids AM band interference; 3.5µA shutdown IQ preserves battery during 30-day standby. |
Use Scenario: Regulating 5V rail for CAN transceivers and door-lock actuators in harsh under-hood environments. IC Role / Device Role / Timing Role: High-reliability 5V supply with AEC-Q100 qualification; SGND separates CAN bus noise from feedback loop. Use Value: ±7.5% PGOOD window ensures robust fault detection; 17V max VIN survives 24V jump-start transients. |
| Industrial Handheld Scanner | Embedded Computing SBC |
|
Use Scenario: Generating 1.2V core voltage for ARM Cortex-A processor and 3.3V I/O rail from single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Dual-output capable via external divider; MODE/SYNC pin selects pulse-skipping for low-noise image sensor supply. Use Value: Adjustable 0.6V–VIN range supports direct Li-ion conversion; 95% efficiency minimizes thermal load in sealed enclosure. |
Use Scenario: Providing stable 1.8V DDR3 memory supply and 5V USB peripheral rail in fanless edge gateway. IC Role / Device Role / Timing Role: Synchronous buck with internal compensation - eliminates external loop components and simplifies layout. Use Value: MS8E thermal performance (θJA = 40°C/W) sustains 1A load at 65°C ambient without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54202DRCT | 2.25MHz, 17V, 2A, but 25µA IQ in shutdown - 7× higher than LTC3621IMS8E-2#TRPBF | Higher current headroom; lacks PGOOD and SGND separation - less suitable for noise-critical automotive sensors | Choose when >1A load margin is required and ultra-low IQ is secondary |
| MP2315GJ-Z | 2.25MHz, 17V, 1A, 20µA IQ - no PGOOD, no SYNC, no SGND, only DFN package | No dedicated signal ground or power-good output - limits use in systems requiring precise sequencing or low-noise analog rails | Choose for cost-sensitive consumer applications where footprint and basic regulation suffice |
Compared with TPS54202DRCT and MP2315GJ-Z, the LTC3621IMS8E-2#TRPBF uniquely combines 3.5µA shutdown IQ, integrated PGOOD with blanking, isolated SGND, and AEC-Q100 qualification - making it the only option meeting stringent requirements for automotive emergency systems and industrial handhelds with battery backup.
Availability
LTC3621IMS8E-2#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, portable emergency radios, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3621IMS8E-2#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.
The LTC3621 family was designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in space-constrained, wide-input-voltage applications - emphasizing thermal robustness, noise isolation, and automotive reliability.
FAQ
What is the maximum input voltage rating for the LTC3621IMS8E-2#TRPBF?
The LTC3621IMS8E-2#TRPBF has an absolute maximum input voltage of 17V. It also includes VIN overvoltage lockout that suspends operation above 19V and resumes at 18.7V, protecting internal MOSFETs during transients. This makes the LTC3621IMS8E-2#TRPBF suitable for 12V automotive systems subject to load-dump conditions.
Does the LTC3621IMS8E-2#TRPBF support adjustable output voltage?
Yes, the LTC3621IMS8E-2#TRPBF supports fully adjustable output from 0.6V to VIN using an external resistor divider on the FB pin, per VOUT = 0.6V × (1 + R2/R1). Unlike fixed-output variants (e.g., LTC3621IMS8E-23.3#TRPBF), the LTC3621IMS8E-2#TRPBF requires no additional components for custom voltage setting.
How does the MODE/SYNC pin configure operating modes on the LTC3621IMS8E-2#TRPBF?
The MODE/SYNC pin on the LTC3621IMS8E-2#TRPBF selects three modes: tie to INTVCC for Burst Mode (3.5µA IQ), ground for pulse-skipping (lowest ripple), or apply external 2.25MHz ±40% clock for forced continuous sync. Each configuration directly alters switching behavior without external logic - a key feature of the LTC3621IMS8E-2#TRPBF.
What is the purpose of the SGND pin on the LTC3621IMS8E-2#TRPBF?
The SGND (Signal Ground) pin on the LTC3621IMS8E-2#TRPBF provides a dedicated low-noise return path for sensitive analog circuitry - including FB, MODE/SYNC, and PGOOD - physically separated from the high-current power GND (exposed pad). This isolation improves regulation accuracy and transient response in noisy environments like automotive ECUs, a defining capability of the LTC3621IMS8E-2#TRPBF.
Is the LTC3621IMS8E-2#TRPBF qualified for automotive applications?
Yes, the LTC3621IMS8E-2#TRPBF is AEC-Q100 qualified for Grade I (–40°C to +125°C), with full characterization across temperature and lifetime testing. Its MS8E package, PGOOD blanking, and 17V input rating meet automotive reliability requirements - confirmed in the official Analog Devices datasheet Rev. D for the LTC3621IMS8E-2#TRPBF.
LTC3621IMS8E-2#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 17V
- 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-2#TRPBF FAQ
1.How can I place an order for LTC3621IMS8E-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IMS8E-2#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-2#TRPBF reliable?
The price and inventory of LTC3621IMS8E-2#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-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IMS8E-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IMS8E-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IMS8E-2#TRPBF?
LTC3621IMS8E-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IMS8E-2#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-2#TRPBF?
For technical support, including LTC3621IMS8E-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IMS8E-2#TRPBF requirements.
6.How does Aetrix verify that LTC3621IMS8E-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IMS8E-2#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-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IMS8E-2#TRPBF?
All LTC3621IMS8E-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IMS8E-2#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-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621IMS8E-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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