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Analog Devices Inc. LTC3621IMS8E-2#PBF
- Part No.:
- LTC3621IMS8E-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621IMS8E-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,091
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Product details
Overview
LTC3621IMS8E-2#PBF 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 from 2.7V–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 LTC3621IMS8E-2#PBF datasheet, LTC3621IMS8E-2#PBF pinout, LTC3621IMS8E-2#PBF application, or LTC3621IMS8E-2#PBF equivalent, this page delivers verified technical context, real-world operating modes (Burst Mode®, pulse-skipping, forced continuous), thermal performance data (θJA = 40°C/W), and validated alternatives for low-IQ high-frequency DC/DC design.
Technical Context
The LTC3621IMS8E-2#PBF uses constant-frequency peak current mode control with internal compensation and 800µs soft-start. Its 2.25MHz oscillator supports external synchronization within ±40% range, enabling EMI-sensitive applications like automotive ADAS modules and industrial IoT gateways.
It integrates PMOS/NMOS synchronous switches (RDS(ON) = 0.37Ω / 0.15Ω at VIN = 5V), overtemperature protection, VIN overvoltage lockout (19V rising), and VINTVCC LDO (3.6V). The MS8E package includes dedicated SGND pin and open-drain PGOOD with ±7.5% window and 32-cycle blanking delay.
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 pre-regulation. |
| Output Current | 1A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or sensor signal chains. |
| Switching Frequency | 2.25MHz (±40% syncable) - enables compact 2.2µH inductors and reduces EMI fundamental below 10MHz. |
| Quiescent Current | <3.5µA in shutdown - extends battery life in emergency radios and always-on monitoring devices. |
| Feedback Reference | 0.6V ±1% - enables precise output programming from 0.6V to VIN using standard resistor dividers. |
| Thermal Resistance | θJA = 40°C/W (MS8E) - allows 1A operation at TA ≤ 85°C with minimal PCB copper area. |
| PGOOD Accuracy | ±7.5% window with 32-cycle blanking - prevents false fault assertions during load transients in embedded computing. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed pad (Pin 9 = GND), rated for –40°C to 125°C junction temperature. Thermally enhanced layout requires soldering exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square wave - requires tight loop layout to minimize EMI. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - bypass with ≥10µF ceramic capacitor. |
| RUN (Pin 3) | Enable control | Active-high logic input; pulls low to disable regulator and reduce IQ to 0.1µA - must not float. |
| FB (Pin 5) | Feedback sense | Monitors resistor divider output; regulates VOUT to 0.6V reference - high-impedance (10nA bias). |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for gate drivers; bypass with ≥1µF ceramic to GND - powers MODE/SYNC logic. |
| MODE/SYNC (Pin 7) | Operating mode select | Selects Burst Mode® (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous/sync (apply 1V–VINTVCC–1.2V). |
| PGOOD (Pin 4) | Power good indicator | Open-drain output pulled high when VOUT within ±7.5%; asserts low after 32 cycles if out-of-regulation. |
| SGND (Pin 8) | Signal ground | Dedicated low-noise return for FB, MODE/SYNC, and PGOOD - separate from power GND (exposed pad). |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to <3.5µA at light loads while maintaining regulation - critical for battery-backed portable scanners. |
| Synchronizable 2.25MHz oscillator | Locks to external clock ±40%, eliminating beat frequencies in multi-rail systems like automotive telematics. |
| Dedicated SGND pin (MS8E only) | Isolates noise-sensitive analog feedback path from power ground - improves load transient response stability. |
| Full dropout operation | Maintains regulation down to VIN ≈ VOUT with PMOS top switch fully on - supports brownout resilience in 12V automotive systems. |
| Integrated overvoltage protection | Shuts down at VIN > 19V and recovers at 18.7V - protects internal FETs from load-dump transients per ISO 7637-2. |
Applications
| Automotive Infotainment | Portable Handheld Scanners |
|---|---|
Use Scenario: Powering display interface ICs and touch controllers in vehicle head units with 9–16V battery input. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator with PGOOD sequencing and EMI-controlled 2.25MHz switching. Use Value: Enables compact layout via small inductors, maintains system uptime during cold-crank (2.7V min VIN), and meets AEC-Q100 Grade I temp range. |
Use Scenario: Supplying image sensor and ARM Cortex-M core in barcode readers with coin-cell backup. IC Role / Device Role / Timing Role: Adjustable-output buck converter operating in Burst Mode® to extend battery life beyond 100 hours. Use Value: Achieves <3.5µA shutdown IQ and 95% peak efficiency at 400mA - directly extends operational runtime per charge. |
| Industrial IoT Gateways | Emergency Radio Systems |
Use Scenario: Generating isolated 3.3V rail for wireless SoCs (e.g., nRF52840) in edge-node gateways powered by 12V PoE injectors. IC Role / Device Role / Timing Role: High-efficiency, sync-capable DC/DC with PGOOD for MCU reset coordination and thermal derating. Use Value: Synchronization eliminates heterodyne noise in RF sections; θJA = 40°C/W supports fanless enclosure designs. |
Use Scenario: Providing regulated 5V for AM/FM receiver ICs and audio amplifiers in hand-cranked emergency radios. IC Role / Device Role / Timing Role: Low-IQ buck regulator with forced continuous mode support for stable audio output under variable crank speed. Use Value: Maintains regulation during intermittent mechanical input; 0.6V reference enables precise 5.0V output (±1%) for analog signal integrity. |
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 |
|---|---|---|---|
| TPS62130ARGTR | 3V–17V input, 3MHz fixed frequency, 1.2A output, no PGOOD or SGND pin, 17µA IQ in PWM mode | Lacks dedicated signal ground and power-good output - unsuitable for safety-critical sequencing or noise-sensitive analog rails | Choose for cost-sensitive, non-sequenced 3.3V/5V rails where board space is constrained and PGOOD is unnecessary |
| MAX17503GCU+T | 4.5V–60V input, 2.2MHz, 1.2A, integrated MOSFETs, ±1.5% VREF, no Burst Mode® | Higher VIN range and lower light-load efficiency - optimized for industrial 24V/48V systems, not low-VIN battery apps | Prefer for wide-input factory automation sensors; avoid where sub-3V startup or <5µA IQ is required |
Compared with TPS62130ARGTR and MAX17503GCU+T, the LTC3621IMS8E-2#PBF uniquely combines ultra-low shutdown IQ (<3.5µA), dedicated SGND, PGOOD with blanking, and true 2.7V startup - making it optimal for battery-powered, safety-aware, and EMI-sensitive embedded systems.
Availability
LTC3621IMS8E-2#PBF is available at Aetrix Electronics and suitable for automotive infotainment, portable handheld scanners, and industrial IoT gateways requiring stable component supply, AEC-Q100-compliant sourcing, and long-term lifecycle management.
Supply support for LTC3621IMS8E-2#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, communications, and industrial markets since 1965.
The LTC3621IMS8E-2#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency, low-quiescent-current DC/DC regulators designed specifically for battery-powered, automotive, and space-constrained embedded systems.
FAQ
What is the minimum input voltage for reliable startup of the LTC3621IMS8E-2#PBF?
The LTC3621IMS8E-2#PBF starts up reliably at VIN = 2.7V, as specified in its absolute maximum ratings and electrical characteristics. Below this threshold, the undervoltage lockout circuit disables operation to protect internal circuitry. Startup behavior is verified across –40°C to 125°C ambient, with full functionality restored once VIN exceeds 2.7V by typical hysteresis.
Does the LTC3621IMS8E-2#PBF support output voltages below 0.6V?
No, the LTC3621IMS8E-2#PBF does not support output voltages below 0.6V. Its internal feedback reference is fixed at 0.6V ±1%, and the datasheet specifies an adjustable output range of 0.6V to VIN. Attempting to set VOUT < 0.6V violates regulation and results in uncontrolled output behavior - confirmed by the VFB electrical characteristic table and block diagram.
How does the PGOOD pin on the LTC3621IMS8E-2#PBF behave during load transients?
The PGOOD pin on the LTC3621IMS8E-2#PBF includes a 32-switching-cycle blanking delay on its falling edge to prevent false deassertion during fast load steps. It remains high as long as VOUT stays within ±7.5% of the programmed value, then goes low only after 32 consecutive cycles of out-of-regulation - a feature unique to the MS8E package and explicitly documented in the Applications Information section.
Can the LTC3621IMS8E-2#PBF be synchronized to a 1.5MHz external clock?
Yes, the LTC3621IMS8E-2#PBF can be synchronized to a 1.5MHz external clock because its native 2.25MHz oscillator supports a ±40% sync range (1.35MHz to 3.15MHz). When the external clock falls within this window, the device locks within 2–3 cycles and operates in forced continuous mode - a capability confirmed in both the Features list and Frequency Sync Capability section.
What is the purpose of the SGND pin on the LTC3621IMS8E-2#PBF?
The SGND pin (Pin 8) on the LTC3621IMS8E-2#PBF provides a dedicated signal ground return for the FB, MODE/SYNC, and PGOOD pins - physically separated from the power ground (exposed pad). This isolation minimizes noise coupling into the feedback path, improving load transient response and stability, especially in mixed-signal systems where analog sensing coexists with high-current switching.
LTC3621IMS8E-2#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:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621IMS8E-2#PBF FAQ
1.How can I place an order for LTC3621IMS8E-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IMS8E-2#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 LTC3621IMS8E-2#PBF reliable?
The price and inventory of LTC3621IMS8E-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621IMS8E-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621IMS8E-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IMS8E-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IMS8E-2#PBF?
LTC3621IMS8E-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IMS8E-2#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 LTC3621IMS8E-2#PBF?
For technical support, including LTC3621IMS8E-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IMS8E-2#PBF requirements.
6.How does Aetrix verify that LTC3621IMS8E-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IMS8E-2#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 LTC3621IMS8E-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621IMS8E-2#PBF?
All LTC3621IMS8E-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IMS8E-2#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 LTC3621IMS8E-2#PBF part is unused and in its original packaging.
Return procedure for LTC3621IMS8E-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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