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Analog Devices Inc. LTC3621EMS8E-3.3#TRPBF
- Part No.:
- LTC3621EMS8E-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621EMS8E-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,988
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Product details
Overview
LTC3621EMS8E-3.3#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in thermally enhanced MSOP-8 (MS8E) package with fixed 3.3V output, 1MHz switching frequency, ±1% output voltage accuracy, and 3.5µA quiescent current in shutdown. It delivers regulated power to microcontrollers, sensors, and communication ICs in space-constrained industrial and automotive systems.
For engineers reviewing the LTC3621EMS8E-3.3#TRPBF datasheet, LTC3621EMS8E-3.3#TRPBF pinout, LTC3621EMS8E-3.3#TRPBF application, or LTC3621EMS8E-3.3#TRPBF equivalent, key selection criteria include its fixed 3.3V output, PGOOD indicator, SGND separation, 2.7V–17V input range, and Burst Mode/pulse-skipping mode flexibility for low-power design.
Technical Context
The LTC3621EMS8E-3.3#TRPBF uses constant-frequency peak current mode control with internal compensation and an 800µs soft-start ramp. Its architecture supports full dropout operation down to VIN ≈ VOUT while maintaining ultralow IQ of 3.5µA in shutdown and <1.5mA in forced continuous mode at light load.
It integrates dual MOSFETs (top PMOS RDS(ON) = 0.37Ω, bottom NMOS RDS(ON) = 0.15Ω), a 0.6V reference amplifier, overtemperature protection, and VIN overvoltage lockout (19V trip). The MS8E package includes dedicated SGND and PGOOD pins-enabling precise noise isolation and system-level power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial rails, battery-backed systems, and automotive cold-crank conditions. |
| Output Voltage | Fixed 3.3V ±1% - eliminates external feedback resistors; ensures stable logic-level supply for MCU/USB/UART peripherals. |
| Max Output Current | 1A - sufficient for powering ARM Cortex-M cores, CAN transceivers, or multi-sensor nodes without external boost. |
| Quiescent Current | 3.5µA in shutdown - enables >1-year battery life in always-on monitoring devices with wake-on-event capability. |
| Switching Frequency | 1MHz - allows use of compact 2.2µH inductors and ceramic capacitors; reduces EMI filter size vs lower-frequency alternatives. |
| PGOOD Accuracy | ±7.5% window with 32-cycle blanking - provides reliable power-good assertion for FPGA configuration or processor reset sequencing. |
| Thermal Performance | θJA = 40°C/W (MS8E) - supports 1A continuous operation at TA ≤ 85°C with minimal copper area; no heatsink required. |
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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connection to inductor; carries high di/dt square wave - requires tight layout and Kelvin routing to minimize EMI. |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - must be bypassed with ≥10µF ceramic capacitor. |
| RUN (Pin 3) | Enable Control | Active-high logic input; pulls regulator out of shutdown - tie to MCU GPIO or system power rail for controlled startup. |
| FB (Pin 5) | Feedback Reference | Internally connected to 3.3V output; no external divider needed - simplifies layout and improves noise immunity. |
| INTVCC (Pin 6) | Internal LDO Output | 3.6V bias rail for gate drivers and analog circuitry - requires ≥1µF ceramic bypass to GND. |
| MODE/SYNC (Pin 7) | Operating Mode Select | Selects Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous (1V–2.4V); also accepts external clock sync. |
| PGOOD (Pin 4) | Power-Good Indicator | Open-drain output pulled high when VOUT is within ±7.5% of 3.3V - used for system reset or enable sequencing. |
| SGND (Pin 8) | Signal Ground | Dedicated low-noise ground return for FB, MODE/SYNC, and PGOOD - must be routed separately from power GND to avoid coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 3.5µA at light load while maintaining regulation - extends battery runtime in portable scanners and emergency radios. |
| Dedicated SGND Pin | Isolates sensitive analog feedback path from noisy power ground - improves output voltage accuracy and transient response stability. |
| Integrated PGOOD with Blanking | 32-cycle delay prevents false triggers during load transients - enables robust power sequencing in FPGA and DSP applications. |
| Full Dropout Support | Maintains regulation down to VIN = VOUT with low IQ - critical for brownout resilience in automotive infotainment and telematics modules. |
| AEC-Q100 Qualified Options | H-grade variants available up to 150°C junction - suitable for under-hood automotive subsystems requiring extended temperature reliability. |
Applications
| Industrial Sensor Node | Automotive Telematics Module |
|---|---|
Use Scenario: Powering a wireless sensor node with BLE MCU, MEMS accelerometer, and environmental sensors from a single Li-ion cell or 12V vehicle bus. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator delivering clean, sequenced power with PGOOD confirmation before MCU boot. Use Value: 3.5µA shutdown IQ enables >2-year shelf life; 1MHz switching allows miniature 0805 inductors and saves PCB area in compact enclosures. | Use Scenario: Supplying 3.3V to GPS receiver, cellular modem, and CAN controller in a vehicle black box unit. IC Role / Device Role / Timing Role: Main system regulator with cold-crank support (2.7V min VIN), PGOOD-driven reset assertion, and AEC-Q100-compliant thermal margin. Use Value: Full dropout operation maintains 3.3V output during engine cranking dips; SGND separation prevents CAN bus noise from corrupting GPS timing signals. |
| Portable Handheld Scanner | Emergency Radio System |
Use Scenario: Providing regulated 3.3V to image sensor, laser driver, and ARM-based decoder in a battery-powered barcode scanner. IC Role / Device Role / Timing Role: High-efficiency step-down converter enabling burst-mode scanning with rapid wake/sleep cycles. Use Value: 95% peak efficiency at 500mA reduces thermal load on plastic housing; 800µs soft-start prevents inrush-induced brownout during button-press activation. | Use Scenario: Delivering stable 3.3V to SDR baseband processor, audio amplifier, and display in a hand-cranked emergency radio. IC Role / Device Role / Timing Role: Ultra-low-IQ regulator sustaining operation from intermittent mechanical energy harvesting. Use Value: 3.5µA shutdown current preserves stored energy between transmissions; 1MHz operation minimizes passive component size for weight-sensitive field deployment. |
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 | 3.0V–17V input, adjustable output (0.9V–6.05V), 3.5µA IQ, but no PGOOD or SGND pin. | Lacks dedicated power-good signaling and signal/power ground separation - unsuitable for FPGA reset or noise-sensitive analog systems. | Select only if output adjustability is required and PGOOD/SGND are not needed. |
| MAX17503GCU+T | 4.5V–60V input, 3.3V fixed option, 1.5mA IQ, integrated FETs, but larger 16-pin TQFN package. | Higher minimum input voltage excludes battery-powered 2.7V–3.6V use cases; higher IQ reduces battery life in always-on designs. | Prefer for high-voltage industrial inputs (>24V), not for low-VIN or ultra-low-power applications. |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3621EMS8E-3.3#TRPBF uniquely combines 2.7V start-up, 3.5µA shutdown IQ, PGOOD, and SGND in an 8-pin MSOP - making it optimal for compact, battery-sensitive, and noise-critical 3.3V systems where layout simplicity and sequencing integrity are essential.
Availability
LTC3621EMS8E-3.3#TRPBF is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive telematics modules, and portable handheld scanners requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant variants.
Supply support for LTC3621EMS8E-3.3#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 precision instrumentation, industrial automation, and automotive markets.
The LTC3621 series is designed for high-efficiency, low-quiescent-current DC/DC conversion in space- and power-constrained applications - emphasizing ultralow IQ, small solution size, and robust operation across wide input ranges and temperature extremes.
FAQ
What is the maximum output current capability of the LTC3621EMS8E-3.3#TRPBF?
The LTC3621EMS8E-3.3#TRPBF delivers up to 1A of continuous output current under typical thermal conditions (TA ≤ 85°C, 2-layer PCB with 2 cm² copper pour). Peak current limit is 1.6A (E/I-grade), and derating applies above 85°C ambient due to θJA = 40°C/W. The device sustains full 1A output even at VIN = 3.6V (near dropout) in forced continuous mode.
Does the LTC3621EMS8E-3.3#TRPBF require external feedback resistors?
No. The LTC3621EMS8E-3.3#TRPBF is a fixed-output variant with internal feedback network set to 3.3V. Pin FB (Pin 5) is internally connected to the output; no external resistor divider is needed. This simplifies layout, improves noise rejection, and eliminates resistor tolerance errors affecting output accuracy.
How does the PGOOD function work on the LTC3621EMS8E-3.3#TRPBF?
The PGOOD pin (Pin 4) is an open-drain output that pulls high via external pull-up when VOUT is within ±7.5% of 3.3V (i.e., 3.05V–3.55V). It asserts after soft-start completes and de-asserts with a 32-cycle blanking delay upon falling out of regulation - preventing glitches during load transients. The internal pull-down RDS(ON) is 275Ω.
Can the LTC3621EMS8E-3.3#TRPBF synchronize to an external clock?
Yes. When the MODE/SYNC pin (Pin 7) is driven by an external CMOS clock, the LTC3621EMS8E-3.3#TRPBF synchronizes its 1MHz oscillator within ±40% (600kHz–1.4MHz). Sync engagement takes 2–3 external clock cycles; loss of sync signal causes automatic reversion to internal frequency within ~7µs. Forced continuous mode is active during sync.
What is the purpose of the SGND pin on the LTC3621EMS8E-3.3#TRPBF?
The SGND pin (Pin 8) provides a dedicated low-noise ground return for the FB, MODE/SYNC, and PGOOD pins - isolating sensitive analog circuitry from high-current power ground paths. Routing SGND separately from the main GND (exposed pad, Pin 9) minimizes voltage offsets and improves output voltage accuracy, especially under dynamic load conditions.
LTC3621EMS8E-3.3#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):
- 3.3V
- 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-3.3#TRPBF FAQ
1.How can I place an order for LTC3621EMS8E-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EMS8E-3.3#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-3.3#TRPBF reliable?
The price and inventory of LTC3621EMS8E-3.3#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-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EMS8E-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EMS8E-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EMS8E-3.3#TRPBF?
LTC3621EMS8E-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EMS8E-3.3#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-3.3#TRPBF?
For technical support, including LTC3621EMS8E-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EMS8E-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3621EMS8E-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EMS8E-3.3#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-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EMS8E-3.3#TRPBF?
All LTC3621EMS8E-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EMS8E-3.3#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-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621EMS8E-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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