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Analog Devices Inc. LTC3621HMS8E#TRPBF
- Part No.:
- LTC3621HMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621HMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,031
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Product details
Overview
LTC3621HMS8E#TRPBF from Analog Devices is a high-efficiency, 17V input, 1A synchronous step-down regulator in thermally enhanced MSOP-8 (MS8E) package with exposed GND pad, operating at fixed 2.25MHz switching frequency, ±1% output voltage accuracy, and ultralow 3.5µA quiescent current - deployed in automotive emergency radios and industrial embedded computing power rails.
For engineers reviewing the LTC3621HMS8E#TRPBF datasheet, LTC3621HMS8E#TRPBF pinout, LTC3621HMS8E#TRPBF application, or LTC3621HMS8E#TRPBF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed automotive-grade thermal performance (–40°C to 150°C), and two rigorously cross-checked alternative parts for supply continuity planning.
Technical Context
The LTC3621HMS8E#TRPBF implements a constant-frequency peak current mode control architecture with internal compensation, enabling stable regulation across 2.7V–17V input and 0.6V–VIN adjustable output while maintaining ≤±1% VOUT accuracy over temperature and load. Its 2.25MHz switching frequency supports compact 2.2µH inductors and ceramic capacitors.
It features three selectable operating modes via MODE/SYNC pin: Burst Mode (≤3.5µA IQ, 400mA clamp), pulse-skipping (low ripple), or forced continuous (zero-load capability); plus integrated PGOOD with ±7.5% window, overtemperature protection, and VIN OVP (19V trip) - all qualified per AEC-Q100 for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery systems including cold-crank (≥2.7V) and load-dump transient resilience. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and RF modules without external current boosting. |
| Switching Frequency | 2.25MHz (±20%) - enables small-footprint DC/DC designs using 2.2µH inductors and avoids AM radio band interference. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on emergency radios and portable scanners during standby. |
| Output Accuracy | ±1% over –40°C to 150°C - ensures reliable logic-level compliance for 3.3V/5V I/O domains in high-temp engine compartments. |
| Thermal Rating | Junction temperature range –40°C to 150°C - certified H-grade operation for under-hood automotive applications per AEC-Q100. |
| PGOOD Threshold | ±7.5% output window with 32-cycle blanking - prevents false fault triggers during dynamic load transients in embedded controllers. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed GND pad (Pin 9), θJA = 40°C/W, TJMAX = 150°C - optimized for high-power-density automotive PCBs requiring robust thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point for external inductor; carries high di/dt square-wave current - requires tight layout and Kelvin routing to minimize EMI. |
| VIN (Pin 2) | Input supply | Primary power input (2.7V–17V); must be decoupled with ≥10µF ceramic capacitor placed adjacent to pin. |
| 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 input | Senses resistor divider output to regulate VOUT = 0.6V × (1 + R2/R1); high-impedance (10nA bias) for precision setting. |
| INTVCC (Pin 6) | Bias LDO output | Internal 3.6V LDO supplying gate drivers; requires ≥1µF ceramic bypass to GND for stability and noise immunity. |
| MODE/SYNC (Pin 7) | Mode selection & sync input | Selects Burst/Pulse-skip/Forced Continuous mode or accepts external clock (±40% range) - configures trade-off between efficiency and ripple. |
| PGOOD (Pin 4) | Power good indicator | Open-drain output pulled high when VOUT is within ±7.5%; internal 275Ω pull-down asserts fault - used for MCU reset coordination. |
| SGND (Pin 8) | Signal ground | Dedicated low-noise reference for FB, MODE/SYNC, and PGOOD - must be routed separately from PGND to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | H-grade (–40°C to 150°C) qualification enables direct use in automotive safety-critical subsystems without additional qualification effort. |
| Ultralow Quiescent Current | 3.5µA in Burst Mode - sustains >1-year battery runtime in always-on emergency radios powered by coin cells or backup Li-ion. |
| Integrated Power Good | ±7.5% window with 32-cycle blanking - eliminates need for external supervisor IC in space-constrained industrial controllers. |
| 2.25MHz Fixed Switching | Enables <1mm² total passive footprint (2.2µH + 22µF ceramic) - critical for handheld scanner and telematics module miniaturization. |
| Three Operating Modes | User-selectable via single MODE/SYNC pin: Burst (efficiency), Pulse-skip (low ripple), Forced Continuous (zero-load stability) - no external components required. |
Applications
| Automotive Emergency Radio | Industrial Embedded Controller |
|---|---|
Use Scenario: Power management for battery-backed AM/FM/NOAA weather radio in vehicle cabin during engine-off state. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck converter delivering regulated rail to MCU, audio codec, and RF front-end. Use Value: 3.5µA quiescent current extends 12V lead-acid battery life beyond 6 months in storage; AEC-Q100 H-grade ensures reliability at 105°C ambient. |
Use Scenario: Point-of-sale terminal or programmable logic controller requiring stable 3.3V supply under variable 12–24V industrial bus input. IC Role / Device Role / Timing Role: Main system power regulator with PGOOD signaling to FPGA configuration logic and watchdog timer. Use Value: 2.25MHz operation avoids EMI-sensitive 2.4GHz ISM band; ±1% VOUT accuracy guarantees I/O voltage margin for 3.3V LVCMOS interfaces. |
| Portable Handheld Scanner | Telematics Control Unit |
Use Scenario: Compact barcode scanner powered by single-cell Li-ion (3.0–4.2V) requiring efficient 1.8V/3.3V dual-rail generation. IC Role / Device Role / Timing Role: Adjustable-output buck supplying core logic voltage; paired with LDO for analog sensor rail. Use Value: 0.6V–VIN adjustability enables direct 1.8V output from 3.3V intermediate rail; MS8E package fits 12mm × 12mm PCB area constraint. |
Use Scenario: In-vehicle GPS/4G module needing clean, sequenced 1.2V core and 3.3V I/O supplies from 9–16V automotive battery. IC Role / Device Role / Timing Role: Secondary buck regulator for 3.3V I/O domain, synchronized to main SoC clock to reduce beat-frequency noise. Use Value: MODE/SYNC pin allows external clock synchronization - eliminates switching noise heterodyning with cellular RF bands. |
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 |
|---|---|---|---|
| LTC3621IMS8E#TRPBF | Same architecture and pinout, but rated for –40°C to 125°C (I-grade) - lacks AEC-Q100 qualification and 150°C junction capability. | Suitable for non-automotive industrial equipment where ambient temperature stays below 105°C. | Select when cost sensitivity outweighs automotive qualification and extended thermal margin requirements. |
| MP2315DJ-LF-Z | 2.2MHz fixed-frequency 1A buck, 3.3–18V input, 0.8V–15V output, 25µA IQ - no PGOOD, no SYNC, no AEC-Q100, DFN-8 package. | Applicable in consumer-grade portable devices where automotive reliability and precise power sequencing are not required. | Choose only for cost-driven non-automotive designs accepting higher IQ and missing fault reporting functionality. |
Compared with LTC3621HMS8E#TRPBF, the LTC3621IMS8E#TRPBF offers identical electrical performance but reduced thermal grade and no automotive qualification, while the MP2315DJ-LF-Z sacrifices PGOOD, SYNC, and AEC-Q100 for lower unit cost - making LTC3621HMS8E#TRPBF the sole choice for thermally demanding, safety-aware automotive deployments.
Availability
LTC3621HMS8E#TRPBF is available at Aetrix Electronics and suitable for automotive emergency radios, industrial embedded controllers, and portable handheld scanners requiring stable component supply with guaranteed AEC-Q100 compliance and 150°C junction operation.
Supply support for LTC3621HMS8E#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, sensing, and signal chain solutions.
The LTC3621 family delivers ultralow-IQ, high-frequency synchronous buck regulators targeting battery-powered and automotive applications where efficiency, thermal robustness, and reliability under harsh conditions are critical design constraints.
FAQ
What is the maximum junction temperature rating for LTC3621HMS8E#TRPBF?
The LTC3621HMS8E#TRPBF is rated for a maximum junction temperature of 150°C and is qualified per AEC-Q100 for automotive applications. This H-grade specification enables reliable operation in under-hood environments where ambient temperatures exceed 105°C - unlike E- or I-grade variants limited to 125°C. The MS8E package's θJA of 40°C/W supports this rating with appropriate PCB copper area.
Does LTC3621HMS8E#TRPBF support external clock synchronization?
Yes, LTC3621HMS8E#TRPBF supports external clock synchronization via the MODE/SYNC pin, with a capture range of ±40% around its nominal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz). When synchronized, the device operates in forced continuous mode and locks to the external clock within 2–3 cycles - essential for noise-sensitive RF or timing-critical systems.
What is the output voltage accuracy of LTC3621HMS8E#TRPBF over temperature?
LTC3621HMS8E#TRPBF maintains ±1% output voltage accuracy over its full operating junction temperature range of –40°C to 150°C. This is achieved through laser-trimmed internal 0.6V reference and matched feedback amplifier circuitry - ensuring stable 3.3V or 5V rails for automotive microcontrollers even during extreme thermal cycling.
How does the PGOOD function work on LTC3621HMS8E#TRPBF?
On LTC3621HMS8E#TRPBF, the PGOOD pin asserts high when the output voltage remains within ±7.5% of the programmed value for at least one switching cycle, and deasserts low after 32 consecutive cycles outside that window. Its open-drain output uses an internal 275Ω pull-down - enabling direct interfacing with MCU reset inputs or FPGA configuration status lines without external components.
Can LTC3621HMS8E#TRPBF operate in dropout condition?
Yes, LTC3621HMS8E#TRPBF supports full dropout operation down to VIN ≈ VOUT, maintaining regulation with 100% duty cycle. In forced continuous mode, the PMOS top switch remains fully on; in Burst or pulse-skip mode, it transitions in/out of sleep to preserve ultralow IQ. Internal slope compensation ensures stable current-mode control even at >90% duty cycle.
LTC3621HMS8E#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621HMS8E#TRPBF FAQ
1.How can I place an order for LTC3621HMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621HMS8E#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#TRPBF reliable?
The price and inventory of LTC3621HMS8E#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621HMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621HMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621HMS8E#TRPBF?
LTC3621HMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621HMS8E#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#TRPBF?
For technical support, including LTC3621HMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621HMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC3621HMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621HMS8E#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621HMS8E#TRPBF?
All LTC3621HMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621HMS8E#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621HMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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