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Analog Devices Inc. LTC3621IMS8E-5#TRPBF
- Part No.:
- LTC3621IMS8E-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621IMS8E-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,535
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Product details
Overview
LTC3621IMS8E-5#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in thermally enhanced MSOP-8 (MS8E) package with independent SGND pin and PGOOD output. It operates at fixed 2.25MHz switching frequency, delivers 5V fixed output with ±1% accuracy over –40°C to 125°C, and achieves 95% peak efficiency at 12VIN/5VOUT. It powers automotive infotainment subsystems requiring low-noise, high-density DC/DC conversion.
For engineers reviewing the LTC3621IMS8E-5#TRPBF datasheet, LTC3621IMS8E-5#TRPBF pinout, LTC3621IMS8E-5#TRPBF application, or LTC3621IMS8E-5#TRPBF equivalent, key selection criteria include its 3.5µA quiescent current in Burst Mode, ±40% external clock synchronization range, 2.25MHz constant-frequency operation, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC3621IMS8E-5#TRPBF uses peak current mode control with internal compensation and 800µs soft-start. Its 2.25MHz oscillator enables compact filter design with ≤2.2µH inductors and ceramic capacitors while maintaining stable regulation across 2.7V–17V input range.
It integrates dual MOSFETs (top PMOS RDS(ON) = 0.37Ω, bottom NMOS RDS(ON) = 0.15Ω), precision 0.6V reference (±1% over temp), and dedicated PGOOD comparator with ±7.5% window and 32-cycle blanking delay - all optimized for automotive-grade transient immunity and dropout operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% (guaranteed over –40°C to 125°C junction temperature) |
| Switching Frequency | 2.25MHz ±20% (enables <2.2µH inductor and small ceramic output caps) |
| Quiescent Current | 3.5µA in Burst Mode (extends battery life in always-on automotive modules) |
| Input Voltage Range | 2.7V to 17V (supports cold-crank 4.5V and load-dump 18V transients with OVLO) |
| Output Current | 1A continuous (derated above 125°C; 1.6A peak current limit with thermal foldback) |
| PGOOD Accuracy | ±7.5% window with 32-cycle delay (prevents false fault triggering during load transients) |
| Thermal Rating | TJMAX = 150°C, θJA = 40°C/W (MS8E package with exposed pad for PCB thermal relief) |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND), SGND (Pin 8), and PGOOD (Pin 4). 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 | Connects to inductor; carries high di/dt square wave; requires tight layout and Kelvin return path |
| VIN (Pin 2) | Main power input | Accepts 2.7V–17V; feeds internal LDO (INTVCC) and power switches; bypass with ≥10µF ceramic |
| RUN (Pin 3) | Enable control | Active-high logic input; <0.3V disables regulator; >1.0V enables; must not float |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output pulled low if VOUT deviates >±7.5%; 32-cycle blanking prevents noise-induced glitches |
| FB (Pin 5) | Feedback sense | Internally tied to 5V output (fixed version); no external divider required |
| INTVCC (Pin 6) | Internal LDO output | 3.6V supply for gate drivers and logic; bypass with ≥1µF ceramic to SGND |
| MODE/SYNC (Pin 7) | Operating mode select | Tied to INTVCC = Burst Mode (low IQ); GND = pulse-skipping (low ripple); external clock = sync + forced continuous |
| SGND (Pin 8) | Signal ground | Separate analog ground return for FB, MODE/SYNC, PGOOD; improves noise immunity vs. power GND |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications (–40°C to 125°C TJ, H-grade option up to 150°C) |
| Ultralow quiescent current | 3.5µA in Burst Mode enables >1-year battery standby in emergency radio systems |
| Integrated PGOOD with blanking | 32-cycle delay ensures reliable system sequencing without false shutdowns during dynamic loads |
| Independent SGND pin | Reduces noise coupling between power and feedback paths, improving stability in noisy automotive environments |
| 2.25MHz constant-frequency operation | Enables use of 2.2µH inductors and 22µF ceramic output caps - reducing solution size by >40% vs. 500kHz designs |
Applications
| Automotive Infotainment | Portable Medical Monitors |
|---|---|
Use Scenario: Powering display backlight, audio codec, and microcontroller in head-unit systems with 12V battery input. IC Role / Device Role / Timing Role: Primary 5V point-of-load regulator with PGOOD signaling to MCU for safe boot sequence. Use Value: 2.25MHz operation avoids AM radio band interference; 3.5µA IQ extends backup battery life during ignition-off states. |
Use Scenario: Providing regulated 5V rail for ECG front-end and Bluetooth LE module in handheld patient monitors. IC Role / Device Role / Timing Role: High-efficiency buck converter enabling >24-hour runtime on single Li-ion cell with low-noise output. Use Value: Burst Mode reduces idle power; ±1% VOUT accuracy ensures precise ADC reference voltage generation. |
| Industrial IoT Gateways | Emergency Communication Radios |
Use Scenario: Converting wide-range 9–36V DC input to stable 5V for ARM Cortex-M7 processor and cellular modem. IC Role / Device Role / Timing Role: Input-stage regulator handling load dump and cold-crank transients with integrated OVLO/UVP. Use Value: 17V absolute max rating and 2.7V UVLO support unregulated industrial supplies; MS8E package aids thermal management in sealed enclosures. |
Use Scenario: Delivering 5V to SDR baseband IC and RF power amplifier in battery-powered emergency radios. IC Role / Device Role / Timing Role: Main DC/DC converter operating in Burst Mode during standby, synchronized to MCU wakeup timer. Use Value: 3.5µA IQ enables multi-week shelf life; PGOOD confirms regulation before enabling RF transmit chain. |
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 | 3.6V–17V input, 5V fixed, 3MHz, 2.5µA IQ, no PGOOD, no AEC-Q100 | Lacks PGOOD output and automotive qualification; lower thermal resistance but no SGND separation | Preferred for cost-sensitive industrial designs where PGOOD and AEC-Q100 are not required |
| MP2315GJ-Z | 4.5V–17V input, 5V fixed, 2MHz, 22µA IQ, no PGOOD, no AEC-Q100 | Higher IQ reduces battery life; no PGOOD or automotive qualification; smaller 8-pin QFN package | Suitable for non-automotive portable devices where board space is critical and IQ <10µA is not mandatory |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621IMS8E-5#TRPBF uniquely combines AEC-Q100 qualification, integrated PGOOD with blanking, independent SGND, and 3.5µA IQ - making it the only choice for automotive infotainment and safety-critical portable medical systems requiring guaranteed startup and fault reporting.
Availability
LTC3621IMS8E-5#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, portable medical monitors, and industrial IoT gateways requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3621IMS8E-5#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.
The LTC3621IMS8E-5#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC/DC regulators, designed specifically for space-constrained, low-IQ, automotive-qualified power conversion in harsh environments.
FAQ
What is the guaranteed output voltage accuracy of the LTC3621IMS8E-5#TRPBF over temperature?
The LTC3621IMS8E-5#TRPBF provides ±1% output voltage accuracy over its full operating junction temperature range of –40°C to 125°C. This is achieved via a precision 0.6V internal reference with low drift and trimmed feedback network specific to the 5V fixed-output variant. The specification is guaranteed for I-grade parts per the datasheet's Electrical Characteristics table.
Does the LTC3621IMS8E-5#TRPBF require an external feedback resistor divider?
No, the LTC3621IMS8E-5#TRPBF does not require an external feedback resistor divider. As a fixed 5V output variant, the FB pin is internally connected to the output; users connect FB directly to VOUT. External resistors are only needed for adjustable versions like the LTC3621IMS8E-2#TRPBF.
How does the PGOOD function behave during output load transients on the LTC3621IMS8E-5#TRPBF?
The LTC3621IMS8E-5#TRPBF's PGOOD output includes a 32-switching-cycle blanking delay on the falling edge. During fast load steps, this prevents momentary dips from falsely triggering a PGOOD low signal. PGOOD goes high immediately upon achieving regulation and remains asserted unless VOUT deviates beyond ±7.5% for more than ~14µs (at 2.25MHz).
Can the LTC3621IMS8E-5#TRPBF be synchronized to an external clock, and what is the acceptable frequency range?
Yes, the LTC3621IMS8E-5#TRPBF supports external clock synchronization via the MODE/SYNC pin. It locks to clocks within ±40% of its nominal 2.25MHz frequency - i.e., 1.35MHz to 3.15MHz. Sync engagement takes 2–3 cycles; loss of external clock causes reversion to internal oscillator within ~7µs.
What is the thermal performance difference between the MS8E and DFN packages for the LTC3621IMS8E-5#TRPBF?
The MS8E package used in the LTC3621IMS8E-5#TRPBF has θJA = 40°C/W, significantly better than the 6-lead DFN's θJA = 64°C/W. This 37.5% improvement allows higher continuous output current at ambient temperature or extended operation at elevated temperatures - critical for automotive under-hood applications.
LTC3621IMS8E-5#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):
- 5V
- 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-5#TRPBF FAQ
1.How can I place an order for LTC3621IMS8E-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IMS8E-5#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-5#TRPBF reliable?
The price and inventory of LTC3621IMS8E-5#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-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IMS8E-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IMS8E-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IMS8E-5#TRPBF?
LTC3621IMS8E-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IMS8E-5#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-5#TRPBF?
For technical support, including LTC3621IMS8E-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IMS8E-5#TRPBF requirements.
6.How does Aetrix verify that LTC3621IMS8E-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IMS8E-5#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-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IMS8E-5#TRPBF?
All LTC3621IMS8E-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IMS8E-5#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-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621IMS8E-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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