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Analog Devices Inc. LTC3621EMS8E-5#TRPBF
- Part No.:
- LTC3621EMS8E-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621EMS8E-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,730
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Product details
Overview
LTC3621EMS8E-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 delivers fixed 5V output at 2.25MHz switching frequency, supports input range 2.7V–17V, achieves ±1% output accuracy and 95% peak efficiency, and operates in Burst Mode (3.5µA IQ) or pulse-skipping mode for portable power management in automotive infotainment modules.
For engineers reviewing the LTC3621EMS8E-5#TRPBF datasheet, LTC3621EMS8E-5#TRPBF pinout, LTC3621EMS8E-5#TRPBF application, or LTC3621EMS8E-5#TRPBF equivalent, key selection criteria include its 2.25MHz fixed-frequency operation, integrated PGOOD with ±7.5% window, thermally optimized MS8E package with exposed pad and SGND separation, and support for light-load efficiency optimization via MODE/SYNC pin configuration.
Technical Context
The LTC3621EMS8E-5#TRPBF implements a constant-frequency peak current-mode control architecture with internal compensation and 800µs soft-start. Its 2.25MHz oscillator enables compact filter design using small inductors (e.g., 2.2µH) and ceramic capacitors while maintaining stable regulation across 2.7V–17V input and full dropout operation.
It integrates dual MOSFETs (top PMOS RDS(ON) = 0.37Ω, bottom NMOS RDS(ON) = 0.15Ω), overtemperature protection, VIN overvoltage lockout (19V trip), and VINTVCC LDO (3.6V). The MS8E package provides dedicated SGND pin and PGOOD open-drain output referenced to independent ground path for noise-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external feedback divider, simplifies layout and improves accuracy stability over temperature. |
| Switching Frequency | 2.25MHz ±20% - enables use of sub-3mm inductors and low-ESR ceramic capacitors, reducing solution size by >40% vs 1MHz designs. |
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery-supplied systems including cold-crank (6V) and load-dump (16V) conditions. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on subsystems such as emergency radio wake-up circuits or telematics backup power. |
| Output Current | 1A continuous - sufficient to power microcontrollers, CAN transceivers, and sensor interfaces without external boost stages. |
| Power Good Accuracy | ±7.5% window with 32-cycle blanking - ensures reliable system reset sequencing and prevents false triggers during load transients. |
| Thermal Performance | θJA = 40°C/W, TJMAX = 150°C - allows 1A operation at +85°C ambient with minimal heatsinking in enclosed enclosures. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND), rated for –40°C to 125°C operating junction temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.
| 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 to minimize EMI. |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - requires local 10µF ceramic bypass close to pin. |
| RUN (Pin 3) | Enable Control | Active-high logic input; <0.3V disables regulator, >1.0V enables - supports sequenced power-up and system-level sleep control. |
| FB (Pin 5) | Feedback Reference | Internally tied to 5V output - no external resistor divider needed; connects directly to VOUT for fixed-output operation. |
| INTVCC (Pin 6) | Internal LDO Output | 3.6V regulated supply for gate drivers and analog circuitry - requires ≥1µF ceramic capacitor to GND for stability. |
| MODE/SYNC (Pin 7) | Operating Mode Select | Configures Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous (1V–2.4V); also accepts external clock for synchronization. |
| PGOOD (Pin 4) | Power Good Indicator | Open-drain output pulled high when VOUT is within ±7.5% of 5V - used for processor reset assertion or downstream enable sequencing. |
| SGND (Pin 8) | Signal Ground | Dedicated low-noise reference for FB, MODE/SYNC, and PGOOD - must be routed separately from power ground to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 3.5µA in Burst Mode enables >1-year battery life in always-on automotive sensors and emergency radios. |
| Integrated Power Good | PGOOD with ±7.5% accuracy and 32-cycle blanking ensures robust system reset timing without external comparators. |
| Thermally Enhanced MS8E Package | Exposed pad + SGND pin reduces thermal resistance by 35% vs standard MSOP and isolates noise-sensitive analog signals. |
| 2.25MHz Fixed Switching | Enables use of 2.2µH inductors and 22µF ceramic output caps - cuts total solution volume by 50% vs 1MHz alternatives. |
| Full Dropout Operation | Maintains regulation down to VIN = VOUT with <3.5µA IQ - critical for brownout resilience in 5V rail backup applications. |
Applications
| Automotive Infotainment | Industrial Sensor Node |
|---|---|
Use Scenario: Powering ARM Cortex-M7 MCU, display driver, and audio codec in head unit under 12V battery with load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD sequencing and 2.25MHz EMI control. Use Value: Eliminates need for external PGOOD comparator and reduces BOM count by 3 components versus discrete solutions. |
Use Scenario: Supplying 5V to LoRaWAN node with ultra-low-power MCU and RF transceiver in remote monitoring enclosure. IC Role / Device Role / Timing Role: Always-on 5V supply with Burst Mode enabling 3.5µA shutdown IQ for multi-year battery life. Use Value: Achieves 10-year shelf life on two AA cells due to sub-4µA quiescent current and zero-current shutdown. |
| Emergency Radio System | Embedded Computing Module |
Use Scenario: Providing regulated 5V to SDR baseband processor and USB-C PD controller in portable emergency comms device. IC Role / Device Role / Timing Role: High-efficiency 5V source supporting 1A peak loads during transmit bursts with fast transient response. Use Value: Delivers 95% efficiency at 500mA load, extending talk time by 22% vs legacy 1MHz regulators. |
Use Scenario: Generating 5V for PCIe switch, SATA controller, and DDR memory interface in fanless edge computing module. IC Role / Device Role / Timing Role: Compact 2.25MHz buck with SGND isolation to prevent digital noise from corrupting analog sensor inputs. Use Value: Reduces conducted EMI by 15dB at 100MHz via high-frequency operation and dedicated signal ground routing. |
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 | 3V–17V input, adjustable 0.9V–6V output, 2.25MHz, 3.5µA IQ, but no PGOOD or SGND pin. | Lacks integrated PGOOD and separate signal ground - requires external monitoring circuit and careful layout to meet automotive reset timing. | Select when cost sensitivity outweighs need for PGOOD integration and noise isolation. |
| MP2315GJ-Z | 4.5V–24V input, fixed 5V output, 2MHz, 25µA IQ, no SYNC/MODE pin, no PGOOD, DFN-10 package. | Higher IQ and no power-good signaling - unsuitable for battery-backed or safety-critical sequencing applications. | Select only for non-critical industrial supplies where PGOOD and ultra-low IQ are not required. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621EMS8E-5#TRPBF uniquely combines fixed 5V output, integrated PGOOD with blanking, dedicated SGND, and 3.5µA IQ in a thermally optimized MSOP - making it the only choice for automotive-compliant, noise-sensitive, battery-conscious 5V point-of-load designs.
Availability
LTC3621EMS8E-5#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, emergency radio systems, and embedded computing modules requiring stable component supply with AEC-Q100-aligned reliability.
Supply support for LTC3621EMS8E-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 (now part of Analog Devices, Inc., formerly Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving precision instrumentation, industrial automation, and automotive markets since 1965.
The LTC3621 series was designed specifically for space-constrained, battery-sensitive, and automotive-grade DC/DC conversion - emphasizing ultralow IQ, high-frequency operation, and robust fault protection in thermally demanding environments.
FAQ
What is the output voltage tolerance of the LTC3621EMS8E-5#TRPBF?
The LTC3621EMS8E-5#TRPBF delivers a fixed 5.0V output with guaranteed ±1% accuracy over temperature (–40°C to 125°C) and line/load conditions, as specified in the Electrical Characteristics table. This tight tolerance eliminates calibration overhead in precision 5V rail applications like sensor signal chains and USB-powered peripherals.
Does the LTC3621EMS8E-5#TRPBF require an external feedback resistor divider?
No - the LTC3621EMS8E-5#TRPBF is a fixed 5V output variant; its FB pin is internally connected to the output, so no external resistor divider is needed. This simplifies layout, improves long-term stability, and removes a common source of output error from resistor drift or layout parasitics.
Can the LTC3621EMS8E-5#TRPBF synchronize to an external clock?
Yes - the MODE/SYNC pin of the LTC3621EMS8E-5#TRPBF accepts an external clock signal and synchronizes the internal 2.25MHz oscillator within ±40% capture range (1.35MHz to 3.15MHz). When synchronized, the device operates in forced continuous mode with precise phase alignment for EMI reduction.
What is the purpose of the SGND pin on the LTC3621EMS8E-5#TRPBF?
The SGND (Signal Ground) pin on the LTC3621EMS8E-5#TRPBF provides a dedicated low-noise return path for sensitive analog functions - including FB, MODE/SYNC, and PGOOD - isolated from high-current power ground paths. This separation minimizes noise coupling into regulation and monitoring circuits.
How does the PGOOD function behave during startup and fault conditions?
The PGOOD output of the LTC3621EMS8E-5#TRPBF goes high after output regulation is achieved and remains high as long as VOUT stays within ±7.5% of 5V. It asserts low after 32 switching cycles if VOUT falls outside that window, providing glitch-free sequencing and preventing premature system wake-up during transient events.
LTC3621EMS8E-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
LTC3621EMS8E-5#TRPBF FAQ
1.How can I place an order for LTC3621EMS8E-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EMS8E-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 LTC3621EMS8E-5#TRPBF reliable?
The price and inventory of LTC3621EMS8E-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 LTC3621EMS8E-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EMS8E-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EMS8E-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EMS8E-5#TRPBF?
LTC3621EMS8E-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EMS8E-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 LTC3621EMS8E-5#TRPBF?
For technical support, including LTC3621EMS8E-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EMS8E-5#TRPBF requirements.
6.How does Aetrix verify that LTC3621EMS8E-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EMS8E-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 LTC3621EMS8E-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EMS8E-5#TRPBF?
All LTC3621EMS8E-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EMS8E-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 LTC3621EMS8E-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621EMS8E-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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