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Analog Devices Inc. LTC3621HMS8E-2#TRPBF
- Part No.:
- LTC3621HMS8E-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621HMS8E-2#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,914
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Product details
Overview
LTC3621HMS8E-2#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 ±1% output voltage accuracy over 0.6V–VIN range, and achieves ultralow 3.5µA quiescent current in Burst Mode for battery-powered systems such as portable handheld scanners and emergency radios.
For engineers reviewing the LTC3621HMS8E-2#TRPBF datasheet, LTC3621HMS8E-2#TRPBF pinout, LTC3621HMS8E-2#TRPBF application, or LTC3621HMS8E-2#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance up to 150°C junction, and real-world operating modes including pulse-skipping, forced continuous, and Burst Mode® with 400mA clamp.
Technical Context
The LTC3621HMS8E-2#TRPBF uses constant-frequency peak current mode control with internal compensation and 800µs soft-start. Its 2.25MHz oscillator supports ±40% external synchronization via MODE/SYNC pin, enabling EMI-sensitive designs to align switching with system clocks.
It integrates PMOS high-side and NMOS low-side power switches with RDS(ON) of 0.37Ω (top) and 0.15Ω (bottom) at VIN = 5V, and features overtemperature protection, VIN overvoltage lockout (19V), and undervoltage lockout (2.7V). The MS8E package includes dedicated SGND and exposed pad GND for optimal noise isolation and thermal dissipation (θJA = 40°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive supplies without pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables adjustable regulation for diverse core/logic rails including 1.2V, 1.8V, 2.5V, 3.3V, 5V. |
| Switching Frequency | 2.25MHz (±10% typical) - allows compact 2.2µH inductors and reduces EMI fundamental frequency. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on sensor nodes and emergency devices. |
| Output Accuracy | ±1% over temperature - ensures stable microcontroller I/O and ADC reference supply under thermal stress. |
| Junction Temperature | –40°C to +150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Peak Current Limit | 1.30A (H-grade) - provides robust short-circuit protection while maintaining 1A continuous output capability. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND); rated for –40°C to +150°C operation; θJA = 40°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connection point for external inductor; carries high di/dt square wave - requires tight layout and Kelvin grounding. |
| VIN (Pin 2) | Input Supply | Primary power input; must be bypassed with ≥10µF ceramic capacitor close to pin to suppress switching transients. |
| RUN (Pin 3) | Enable Control | Active-high logic input; <0.3V disables regulator, >1.0V enables - prevents floating via pull-down resistor. |
| FB (Pin 5) | Feedback Input | Senses divided output voltage; sets VOUT = 0.6V × (1 + R2/R1); internal 0.6V reference with ±1% tolerance. |
| INTVCC (Pin 6) | Bias LDO Output | 3.6V internal LDO for gate drive; requires ≥1µF ceramic bypass to GND for stability and noise immunity. |
| MODE/SYNC (Pin 7) | Operating Mode Select | Configures Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), forced continuous (1V–VINTVCC–1.2V), or external sync. |
| PGOOD (Pin 4) | Power Good Indicator | Open-drain output pulled high when VOUT is within ±7.5%; includes 32-cycle blanking to reject transient glitches. |
| SGND (Pin 8) | Signal Ground | Dedicated low-noise ground return for FB, MODE/SYNC, and PGOOD - isolated from power GND to minimize coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces quiescent current to 3.5µA while maintaining regulation - critical for multi-year battery life in IoT sensors. |
| Independent SGND Pin | Separates signal and power ground paths to prevent FB voltage error from high-current switching noise. |
| Thermally Enhanced MS8E Package | Exposes die pad (Pin 9) directly to PCB copper - achieves 40°C/W θJA, enabling 1A operation without heatsink. |
| PGOOD with Blanking Delay | 32-cycle delay on falling edge prevents false fault triggers during load transients or startup overshoot. |
| 2.25MHz Fixed Frequency | Enables use of small, low-profile 2.2µH inductors and 22µF ceramic output capacitors - saves board space. |
Applications
| Portable Handheld Scanners | Automotive Infotainment Power Rails |
|---|---|
Use Scenario: Compact barcode scanner powered by single-cell Li-ion (3.0–4.2V) requiring clean 1.8V and 3.3V for image sensor and MCU. IC Role / Device Role / Timing Role: Primary buck converter generating regulated 3.3V rail with PGOOD signaling to enable processor boot sequence. Use Value: 2.25MHz operation avoids AM radio band interference; 3.5µA quiescent current preserves battery during standby scanning intervals. |
Use Scenario: Powering FPGA configuration memory and display interface ICs in head unit with 12V automotive supply. IC Role / Device Role / Timing Role: Point-of-load regulator delivering 1.2V core voltage with tight ±1% accuracy and thermal shutdown at 150°C. Use Value: H-grade 150°C rating ensures reliability under dashboard temperature cycling; SGND pin isolates digital noise from analog video circuitry. |
| Industrial Embedded Controllers | Emergency Radio DC-DC Stage |
Use Scenario: DIN-rail mounted PLC module operating from 24V bus with need for isolated 5V and 3.3V outputs. IC Role / Device Role / Timing Role: Pre-regulator stepping 24V down to 5V before isolated DC-DC stage; synchronized to system clock via MODE/SYNC pin. Use Value: ±40% sync range allows alignment with master 2MHz clock to reduce conducted EMI peaks; 17V max VIN handles 24V transients. |
Use Scenario: Battery-backed emergency radio requiring ultra-low-power 3.3V supply from alkaline or NiMH cells (1.2–1.5V/cell). IC Role / Device Role / Timing Role: High-efficiency buck converter supporting 2.7V minimum input to sustain operation until battery depletion. Use Value: Full dropout operation maintains regulation down to VIN = VOUT; 3.5µA shutdown current minimizes self-discharge during long storage periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 2.5V–6V input, 3MHz fixed frequency, 3.6µA IQ, no PGOOD or SGND pin | Limited to low-VIN apps; lacks automotive temp grade and independent signal ground | Choose for cost-sensitive consumer apps where 6V max VIN suffices and PGOOD is not required. |
| MP2315GJ-Z | 4.5V–28V input, 2MHz, 25µA IQ, no sync or PGOOD, DFN-10 package | Higher IQ degrades battery life; no thermal grade beyond 125°C; no dedicated SGND | Choose for high-input industrial supplies where 25µA IQ is acceptable and layout noise immunity is less critical. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621HMS8E-2#TRPBF uniquely combines 17V input, 2.25MHz operation, 3.5µA IQ, PGOOD, SGND, and 150°C H-grade qualification - making it the only option for thermally demanding, battery-critical, and noise-sensitive automotive or portable applications.
Availability
LTC3621HMS8E-2#TRPBF is available at Aetrix Electronics and suitable for portable handheld scanners, automotive infotainment systems, and emergency radio designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3621HMS8E-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 industrial, automotive, communications, and healthcare markets with precision power, sensing, and timing solutions.
The LTC3621 family is designed for high-efficiency, low-quiescent-current DC-DC conversion in space-constrained and thermally demanding applications - emphasizing ultralow IQ, wide VIN range, and robust thermal performance up to 150°C.
FAQ
What is the maximum junction temperature specification for the LTC3621HMS8E-2#TRPBF?
The LTC3621HMS8E-2#TRPBF is an H-grade device rated for operation from –40°C to +150°C junction temperature. This specification is guaranteed per Analog Devices' automotive qualification process and enables reliable use in under-hood automotive modules and high-ambient industrial enclosures where standard I-grade parts (125°C) would derate prematurely.
Does the LTC3621HMS8E-2#TRPBF support external frequency synchronization?
Yes, the LTC3621HMS8E-2#TRPBF supports external synchronization via its MODE/SYNC pin, with a capture range of ±40% around its nominal 2.25MHz frequency. When an external clock is applied, the device enters forced continuous mode and locks to the external source within 2–3 cycles - a key feature for reducing EMI in noise-sensitive systems like medical or audio equipment.
How does the SGND pin improve noise performance in the LTC3621HMS8E-2#TRPBF?
The SGND pin on the LTC3621HMS8E-2#TRPBF provides a dedicated low-noise ground return path for sensitive analog circuitry - specifically the FB, MODE/SYNC, and PGOOD pins. By separating signal ground from power ground (GND), it prevents high di/dt switching currents from inducing voltage errors in the feedback loop, thereby improving output voltage accuracy and transient response in noisy environments.
What is the purpose of the PGOOD pin on the LTC3621HMS8E-2#TRPBF?
The PGOOD pin on the LTC3621HMS8E-2#TRPBF is an open-drain output that signals when the regulated output voltage is within ±7.5% of its target value. It includes a built-in 32-cycle blanking delay on the falling edge to suppress false triggers during load transients or startup overshoot - ensuring reliable power sequencing in microprocessor-based systems using the LTC3621HMS8E-2#TRPBF.
Can the LTC3621HMS8E-2#TRPBF operate in full dropout mode?
Yes, the LTC3621HMS8E-2#TRPBF supports full dropout operation: when VIN approaches VOUT, its duty cycle increases to near 100%, and internal slope compensation maintains stable current-mode control. In forced continuous mode, the top PMOS switch remains fully on; in Burst Mode, it transitions in/out of sleep to preserve ultralow IQ - extending usable battery life down to the cell's end-of-discharge voltage.
LTC3621HMS8E-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621HMS8E-2#TRPBF FAQ
1.How can I place an order for LTC3621HMS8E-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621HMS8E-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 LTC3621HMS8E-2#TRPBF reliable?
The price and inventory of LTC3621HMS8E-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 LTC3621HMS8E-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621HMS8E-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621HMS8E-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621HMS8E-2#TRPBF?
LTC3621HMS8E-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621HMS8E-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 LTC3621HMS8E-2#TRPBF?
For technical support, including LTC3621HMS8E-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621HMS8E-2#TRPBF requirements.
6.How does Aetrix verify that LTC3621HMS8E-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621HMS8E-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 LTC3621HMS8E-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621HMS8E-2#TRPBF?
All LTC3621HMS8E-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621HMS8E-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 LTC3621HMS8E-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621HMS8E-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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