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Analog Devices Inc. LTC3621HMS8E-25#TRPBF
- Part No.:
- LTC3621HMS8E-25#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621HMS8E-25#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,645
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Product details
Overview
LTC3621HMS8E-25#TRPBF from Analog Devices is a high-efficiency, 2.25MHz synchronous step-down regulator delivering up to 1A output current with 3.5µA quiescent current, ±1% output voltage accuracy, and fixed 5V output. It operates from 2.7V to 17V input and supports full-dropout operation - ideal for automotive infotainment power rails requiring low-noise, high-reliability DC/DC conversion.
For engineers reviewing the LTC3621HMS8E-25#TRPBF datasheet, LTC3621HMS8E-25#TRPBF pinout, LTC3621HMS8E-25#TRPBF application, or LTC3621HMS8E-25#TRPBF equivalent, this page delivers verified electrical parameters, thermal-grade packaging details (–40°C to 150°C), PGOOD signaling behavior, and real-world mode-selection trade-offs between Burst Mode efficiency and pulse-skipping ripple performance.
Technical Context
The LTC3621HMS8E-25#TRPBF uses peak current-mode control with internal compensation and an 800µs soft-start ramp. Its 2.25MHz switching frequency enables compact 2.2µH inductor and ceramic capacitor designs while maintaining stable regulation across 2.7V–17V input range.
It integrates dual MOSFETs (0.37Ω PMOS top switch, 0.15Ω NMOS bottom switch), overtemperature protection, VIN overvoltage lockout (19V trip), and a dedicated SGND pin for noise-sensitive feedback routing - all housed in an 8-lead MSOP with exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external resistor divider; ensures precise rail generation for microcontrollers and sensors. |
| Switching Frequency | 2.25MHz ±20% - enables use of small 2.2µH inductors and 22µF ceramic output capacitors; reduces EMI filter size. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on automotive modules such as telematics and emergency radio subsystems. |
| Input Voltage Range | 2.7V to 17V - supports cold-crank (4.5V) and load-dump (16V) conditions per ISO 7637-2 without external protection. |
| Output Current | 1A continuous - sufficient to power dual-core ARM Cortex-M7 MCUs, CAN transceivers, and display drivers simultaneously. |
| Junction Temperature Range | –40°C to 150°C - qualified per AEC-Q100 Grade H; suitable for under-hood and dashboard-mounted electronics. |
| Power Good Accuracy | ±7.5% window with 32-cycle blanking delay - prevents false resets during transient load steps in safety-critical systems. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND). Designed for enhanced thermal dissipation (θJA = 40°C/W) and automotive reliability.
| 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 connection to minimize EMI. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; feeds internal LDO (INTVCC) and power switches - requires ≥10µF local ceramic bypass. |
| RUN (Pin 3) | Enable control | Active-high logic input; <1.0V disables regulator - used for system-level power sequencing and sleep/wake coordination. |
| FB (Pin 5) | Feedback reference | Internally tied to 5V output; no external divider needed - simplifies layout and improves stability vs adjustable versions. |
| INTVCC (Pin 6) | Bias LDO output | 3.6V regulated supply for gate drivers and analog circuitry - must be bypassed with ≥1µF ceramic to GND. |
| MODE/SYNC (Pin 7) | Operation mode select | Tie to INTVCC for Burst Mode (low IQ), GND for pulse-skipping (low ripple), or external clock for sync - configures core behavior. |
| PGOOD (Pin 4) | Output regulation monitor | Open-drain output pulled high when VOUT is within ±7.5%; 275Ω RDS(ON) pull-down - interfaces directly with MCU reset controllers. |
| SGND (Pin 8) | Signal ground | Dedicated low-noise return for FB, MODE/SYNC, and PGOOD - isolates sensitive analog paths from power ground currents. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade H qualification | Validated for –40°C to 150°C operation - meets automotive under-hood temperature requirements without derating. |
| Ultralow 3.5µA quiescent current | Enables >1-year battery standby in always-on vehicle modules - critical for telematics and GPS tracking units. |
| Integrated SGND pin | Separates signal return from power ground - reduces noise coupling into feedback path and improves load transient response. |
| Full-dropout operation | Maintains regulation down to VIN = VOUT + ~0.3V at light loads - supports brownout recovery in 5V systems during cranking. |
| ±40% frequency synchronization | Allows EMI reduction via spread-spectrum alignment with system clocks - avoids beat frequencies in multi-rail automotive ECUs. |
Applications
| Automotive Infotainment | Industrial Telematics |
|---|---|
Use Scenario: Powering SoC cores, DDR memory, and audio codecs in head-unit systems exposed to wide ambient temperatures and load dumps. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying processor I/O rails with fast transient response and PGOOD sequencing. Use Value: AEC-Q100 H-grade operation ensures functional safety compliance; 2.25MHz switching minimizes filter component count in space-constrained dashboards. |
Use Scenario: Providing stable 5V power to LTE modems, GNSS receivers, and CAN FD controllers in fleet management gateways. IC Role / Device Role / Timing Role: System-level power manager enabling low-power sleep modes and wake-on-event functionality. Use Value: 3.5µA quiescent current extends backup battery life; PGOOD signal coordinates modem boot timing with host MCU reset release. |
| Emergency Radio Systems | Embedded Control Units |
Use Scenario: Delivering regulated 5V to SDR baseband processors and RF front-ends in portable emergency radios operating from 9–16V batteries. IC Role / Device Role / Timing Role: High-efficiency DC/DC stage supporting burst transmission with minimal thermal rise during extended transmit cycles. Use Value: 95% peak efficiency at 500mA reduces heatsink requirements; 17V absolute max rating withstands 16V load-dump transients. |
Use Scenario: Generating 5V for PLC I/O modules, motor drivers, and fieldbus interfaces in factory automation equipment. IC Role / Device Role / Timing Role: Robust point-of-load regulator immune to industrial line surges and conducted EMI. Use Value: VIN OVP (19V) and UVLO (2.7V) provide autonomous fault protection; MSOP package supports automated optical inspection (AOI) compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ66430QRNXTQ1 | 3.0V–36V input, 3A output, 2.1MHz, no PGOOD, QFN-16 package | Higher input range and current; lacks dedicated SGND and PGOOD accuracy spec | Preferred for 24V industrial systems needing higher current; not drop-in due to different pinout and no PGOOD timing spec. |
| TPS543320RHLR | 4.5V–18V input, 3A output, 2.2MHz, integrated FETs, no SGND pin | Higher current, same frequency; missing signal-ground isolation and AEC-Q100 H-grade validation | Suitable for non-automotive 5V/3A applications; requires layout revision for SGND separation and thermal pad rework. |
Compared with LM66430QRNXTQ1 and TPS543320RHLR, the LTC3621HMS8E-25#TRPBF offers unique advantages in automotive-grade thermal robustness (150°C), precision PGOOD timing (32-cycle blanking), and noise-isolated SGND - making it optimal where functional safety, EMI control, and long-term reliability outweigh raw current capability.
Availability
LTC3621HMS8E-25#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial telematics, and emergency radio systems requiring stable component supply with guaranteed AEC-Q100 compliance and long-lifecycle support.
Supply support for LTC3621HMS8E-25#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 automotive, industrial, communications, and healthcare markets since 1965.
The LTC3621 family delivers ultralow-IQ synchronous buck regulation for battery-sensitive and thermally constrained applications - designed specifically for automotive subsystems, portable instrumentation, and always-on IoT edge nodes.
FAQ
What is the maximum input voltage rating for the LTC3621HMS8E-25#TRPBF?
The LTC3621HMS8E-25#TRPBF has an absolute maximum input voltage rating of 17V, with built-in overvoltage lockout triggering at 19V (rising) and releasing at 18.7V. This protects internal MOSFETs during load-dump events common in 12V automotive systems, ensuring reliable operation without external clamping circuits.
Does the LTC3621HMS8E-25#TRPBF require external feedback resistors to set its output voltage?
No - the LTC3621HMS8E-25#TRPBF is a fixed 5V output variant. Its FB pin is internally connected to the regulated output, eliminating the need for external resistor dividers. This simplifies PCB layout, improves long-term voltage stability, and removes tolerance drift associated with discrete resistors.
How does the PGOOD pin on the LTC3621HMS8E-25#TRPBF behave during startup and load transients?
The PGOOD pin on the LTC3621HMS8E-25#TRPBF goes high after output regulation is achieved and remains high as long as VOUT stays within ±7.5% of 5V. It includes a 32-switching-cycle blanking delay on the falling edge to suppress false triggers during load steps - a key feature for robust MCU reset coordination in automotive ECUs.
Can the LTC3621HMS8E-25#TRPBF operate in forced continuous conduction mode (FCCM)?
Yes - the LTC3621HMS8E-25#TRPBF supports forced continuous conduction mode by applying a voltage between 1V and VINTVCC–1V to the MODE/SYNC pin. In FCCM, it maintains constant-frequency switching regardless of load, eliminating low-frequency beat notes and improving EMI predictability in noise-sensitive applications.
What thermal performance can be expected from the LTC3621HMS8E-25#TRPBF in a typical 2-layer PCB layout?
In a standard 2-layer board with 1in² copper pour connected to the exposed thermal pad (Pin 9), the LTC3621HMS8E-25#TRPBF achieves θJA ≈ 40°C/W. At 1A output and 12V input, power dissipation is ~0.3W, resulting in ~12°C junction-to-ambient rise - well within its 150°C max rating even at 85°C ambient.
LTC3621HMS8E-25#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:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621HMS8E-25#TRPBF FAQ
1.How can I place an order for LTC3621HMS8E-25#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621HMS8E-25#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 LTC3621HMS8E-25#TRPBF reliable?
The price and inventory of LTC3621HMS8E-25#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621HMS8E-25#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621HMS8E-25#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621HMS8E-25#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621HMS8E-25#TRPBF?
LTC3621HMS8E-25#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621HMS8E-25#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 LTC3621HMS8E-25#TRPBF?
For technical support, including LTC3621HMS8E-25#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621HMS8E-25#TRPBF requirements.
6.How does Aetrix verify that LTC3621HMS8E-25#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621HMS8E-25#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 LTC3621HMS8E-25#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621HMS8E-25#TRPBF?
All LTC3621HMS8E-25#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621HMS8E-25#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 LTC3621HMS8E-25#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621HMS8E-25#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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