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Analog Devices Inc. LTC3621EMS8E#PBF
- Part No.:
- LTC3621EMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621EMS8E#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,207
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Product details
Overview
LTC3621EMS8E#PBF from Analog Devices is a 17V, 1A synchronous step-down regulator in thermally enhanced MSOP-8 (MS8E) package with independent SGND pin and Power Good output. It operates from 2.7V to 17V input, delivers adjustable 0.6V–VIN output, features 2.25MHz fixed switching frequency (±40% sync range), <3.5µA quiescent current in shutdown, and ±1% output voltage accuracy - deployed in automotive infotainment power rails and portable handheld scanners.
For engineers reviewing the LTC3621EMS8E#PBF datasheet, LTC3621EMS8E#PBF pinout, LTC3621EMS8E#PBF application, or LTC3621EMS8E#PBF equivalent, key selection criteria include its 2.25MHz operation for compact filter design, Burst Mode®/pulse-skipping mode selection via MODE/SYNC pin, PGOOD indicator with ±7.5% window and 32-cycle blanking, and AEC-Q100 qualification for automotive use cases requiring high reliability under thermal stress.
Technical Context
The LTC3621EMS8E#PBF uses constant-frequency peak current-mode control with internal compensation and 800µs soft-start. Its architecture supports full dropout operation with low IQ, maintaining regulation down to VIN ≈ VOUT while sustaining 1.6A peak current limit across duty cycles up to 100%.
It integrates dual MOSFET drivers (0.37Ω top PMOS / 0.15Ω bottom NMOS), an internal 3.6V INTVCC LDO, overtemperature protection, and VIN overvoltage lockout (19V rising, 18.7V falling). The MS8E package includes dedicated SGND pin and exposed pad (Pin 9) for thermal management at 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 battery-supplied systems without external pre-regulation. |
| Output Voltage Range | Adjustable 0.6V to VIN - enables precise rail generation for modern low-voltage logic (e.g., 1.2V, 1.8V, 3.3V) using external resistor divider. |
| Switching Frequency | 2.25MHz fixed (±40% sync range) - allows use of small 1–2.2µH inductors and ceramic capacitors for space-constrained PCB layouts. |
| Quiescent Current | <3.5µA in shutdown - extends battery life in always-on emergency radios and portable scanners during standby. |
| Output Accuracy | ±1% over temperature and line/load - ensures stable core voltage for microcontrollers and FPGAs without post-regulation trimming. |
| Peak Output Current | 1A continuous - sufficient for powering single-core ARM processors, display drivers, or sensor interface ICs. |
| Power Good Threshold | ±7.5% window with 32-cycle blanking - prevents false PGOOD toggling during load transients in automotive ECU power sequencing. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND). Thermally enhanced layout supports 150°C max junction temperature (θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects directly to inductor; carries high di/dt square wave - requires tight loop area and Kelvin routing to minimize EMI. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal circuitry and top FET - must be bypassed with ≥10µF ceramic capacitor near pin. |
| RUN (Pin 3) | Enable control | Active-high logic input; pulls regulator out of shutdown - tie to VIN or microcontroller GPIO for sequenced power-up. |
| FB (Pin 5) | Feedback sense | Monitors resistor divider output; sets VOUT = 0.6V × (1 + R2/R1) - high-impedance (10nA bias) for minimal divider current loss. |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for gate drivers and analog blocks - requires ≥1µF ceramic bypass 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) | Output voltage monitor | Open-drain output pulled high when VOUT within ±7.5%; internal 275Ω pull-down active outside window - used for system reset or sequencing. |
| SGND (Pin 8) | Signal ground reference | Dedicated low-noise ground for FB, MODE/SYNC, and PGOOD - must be routed separately from power ground to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to <3.5µA at light loads while maintaining regulation - critical for battery-powered devices with intermittent activity. |
| Independent SGND pin | Isolates feedback and control signals from noisy power ground - improves load transient response and output voltage accuracy. |
| Power Good (PGOOD) with blanking | 32-cycle delay prevents false triggers during startup or load steps - enables reliable power sequencing in multi-rail systems. |
| 2.25MHz fixed frequency + sync capability | Enables compact magnetics and avoids AM band interference; ±40% sync range allows coordination with system clocks. |
| AEC-Q100 qualified (Grade 1) | Validated for –40°C to +125°C operation with automotive-grade process controls - suitable for engine control, ADAS, and infotainment modules. |
Applications
| Automotive Infotainment Power | Portable Handheld Scanners |
|---|---|
|
Use Scenario: Powering DSP, touchscreen controller, and audio codec in vehicle head units with 12V battery input subject to cold-crank and load-dump transients. IC Role / Device Role / Timing Role: Primary 3.3V/1.8V buck converter providing clean, sequenced, and monitored rails with PGOOD signaling for MCU boot validation. Use Value: 2.25MHz operation minimizes inductor size for tight dashboard space; AEC-Q100 qualification ensures reliability across temperature and vibration profiles. |
Use Scenario: Battery-powered barcode scanner requiring long runtime and instant wake-up from deep sleep between scans. IC Role / Device Role / Timing Role: Main system regulator delivering 3.3V to microcontroller and imager, entering Burst Mode® between scan events to conserve energy. Use Value: <3.5µA shutdown IQ extends shelf life; adjustable VOUT supports future firmware upgrades requiring different core voltages. |
| Industrial Sensor Node | Emergency Radio Power Management |
|
Use Scenario: Remote wireless sensor node powered by Li-ion or 2xAA batteries, transmitting data intermittently over LoRaWAN or NB-IoT. IC Role / Device Role / Timing Role: Efficient step-down regulator supplying 1.2V to ultra-low-power MCU and 3.3V to RF transceiver, with RUN pin controlled by RTC alarm. Use Value: High efficiency (>90%) across 1mA–1A load range reduces heat buildup in sealed enclosures; wide VIN accommodates battery voltage decay. |
Use Scenario: Emergency radio with manual crank charging and supercapacitor backup, needing regulated 3.3V output from variable 2.7V–10V input. IC Role / Device Role / Timing Role: Primary DC-DC converter enabling full functionality across entire input range, including dropout operation near end-of-charge. Use Value: Full dropout capability maintains 3.3V output even as input drops to 3.5V; low IQ preserves stored energy during standby. |
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 | 3.6V–17V input, 3MHz fixed frequency, 1.2A output, no PGOOD or SGND pin, 2.5µA IQ in shutdown | Lacks dedicated signal ground and PGOOD monitoring - less suitable for automotive sequencing or noise-sensitive analog subsystems | Preferred where board space is tighter and PGOOD/SGND not required; lower cost but reduced diagnostic capability |
| MP2315GJ-Z | 4.5V–28V input, 2MHz fixed frequency, 1.5A output, no sync capability, 25µA IQ in shutdown, no AEC-Q100 rating | Higher VIN range suits 24V industrial systems but higher IQ and no automotive qualification limit use in vehicular environments | Appropriate for non-automotive 24V applications where extended input range outweighs IQ and qualification needs |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621EMS8E#PBF uniquely combines AEC-Q100 qualification, dedicated SGND, PGOOD with blanking, and sub-4µA shutdown IQ - making it the only option among the three validated for safety-critical automotive power domains with stringent noise and reliability requirements.
Availability
LTC3621EMS8E#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, portable handheld scanners, and industrial sensor nodes requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3621EMS8E#PBF 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, communications, and automotive markets.
The LTC3621EMS8E#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC-DC regulators designed specifically for space-constrained, battery-sensitive, and automotive-grade applications demanding ultralow quiescent current and robust thermal performance.
FAQ
What is the switching frequency of the LTC3621EMS8E#PBF and can it be synchronized to an external clock?
The LTC3621EMS8E#PBF operates at a fixed 2.25MHz switching frequency. Yes, it supports synchronization to an external clock signal within ±40% of 2.25MHz (i.e., 1.35MHz to 3.15MHz) via the MODE/SYNC pin. When synchronized, the device enters forced continuous mode and locks to the external clock within 2–3 cycles. This capability enables EMI reduction through frequency dithering or system-level clock alignment in multi-rail designs.
Does the LTC3621EMS8E#PBF support adjustable output voltage, and what is the feedback reference voltage?
Yes, the LTC3621EMS8E#PBF supports fully adjustable output voltage from 0.6V to VIN using an external resistor divider connected to the FB pin. Its internal feedback reference voltage is precisely 0.6V (±1% over temperature and line/load), enabling accurate VOUT setting via VOUT = 0.6V × (1 + R2/R1). Fixed-output variants exist, but the LTC3621EMS8E#PBF is the adjustable version in MS8E package.
What is the purpose of the SGND pin on the LTC3621EMS8E#PBF, and how should it be routed?
The SGND (Signal Ground) pin on the LTC3621EMS8E#PBF provides a dedicated low-noise ground reference for sensitive analog circuits - specifically the FB, MODE/SYNC, and PGOOD pins. It must be routed separately from the main power ground (GND on exposed pad) and connected to a quiet ground plane or star point near the FB divider. Improper SGND routing risks degraded load regulation, increased output ripple, or false PGOOD assertions due to ground bounce.
How does the PGOOD function work on the LTC3621EMS8E#PBF, and what is its blanking time?
The PGOOD pin on the LTC3621EMS8E#PBF is an open-drain output that goes high when VOUT is within ±7.5% of the programmed value. It includes a built-in blanking delay of approximately 32 switching cycles (~14.2µs at 2.25MHz) on the falling edge to suppress false low assertions during load transients or startup overshoot. This ensures reliable power sequencing in multi-rail systems without external filtering components.
Is the LTC3621EMS8E#PBF qualified for automotive applications, and what temperature grade does it support?
Yes, the LTC3621EMS8E#PBF is AEC-Q100 qualified for automotive applications (Grade 1), rated for operation from –40°C to +125°C junction temperature. It is manufactured with automotive-grade process controls and undergoes rigorous reliability testing. The "E" suffix denotes the industrial/automotive temperature grade, and the MS8E package's exposed pad enhances thermal performance under sustained high-temperature conditions typical in engine compartments or infotainment enclosures.
LTC3621EMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621EMS8E#PBF FAQ
1.How can I place an order for LTC3621EMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EMS8E#PBF 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#PBF reliable?
The price and inventory of LTC3621EMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621EMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621EMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EMS8E#PBF?
LTC3621EMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EMS8E#PBF 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#PBF?
For technical support, including LTC3621EMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EMS8E#PBF requirements.
6.How does Aetrix verify that LTC3621EMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EMS8E#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621EMS8E#PBF?
All LTC3621EMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EMS8E#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3621EMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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