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Analog Devices Inc. LTC3621EMS8E-2#PBF
- Part No.:
- LTC3621EMS8E-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621EMS8E-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:658
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Product details
Overview
LTC3621EMS8E-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 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 emergency radios and portable handheld scanners.
For engineers reviewing the LTC3621EMS8E-2#PBF datasheet, LTC3621EMS8E-2#PBF pinout, LTC3621EMS8E-2#PBF application, or LTC3621EMS8E-2#PBF equivalent, key selection criteria include its 2.25MHz high-frequency operation enabling compact filter design, ultralow IQ for battery longevity, PGOOD monitoring capability, and support for Burst Mode®, pulse-skipping, and forced continuous modes across wide load ranges.
Technical Context
The LTC3621EMS8E-2#PBF implements constant-frequency peak current mode control with internal compensation and 800µs soft-start. Its 2.25MHz oscillator enables use of sub-3mm inductors and ceramic capacitors while maintaining stability across 0.6V–VIN output adjustment.
It integrates dual MOSFETs (top PMOS RDS(ON) = 0.37Ω, bottom NMOS RDS(ON) = 0.15Ω at VIN = 5V), overtemperature protection, VIN overvoltage lockout (19V trip), and undervoltage lockout (2.7V). The MODE/SYNC pin supports external clock synchronization and selectable operating modes without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery systems including 12V nominal rails with cold-crank margin. |
| Output Voltage Range | Adjustable 0.6V to VIN - enables precise regulation for core voltages (e.g., 1.2V, 1.8V, 3.3V) using external resistor divider. |
| Switching Frequency | 2.25MHz (±40% sync range) - allows ultra-compact 2.2µH inductor and low-ESR ceramic capacitor designs, reducing board area by >40% vs 1MHz parts. |
| Quiescent Current | <3.5µA in shutdown - extends battery life in always-on portable devices such as emergency radios and handheld scanners. |
| Output Accuracy | ±1% over temperature and line/load - ensures reliable microcontroller core voltage compliance without post-regulation trimming. |
| Peak Current Limit | 1.6A (E-grade) - provides robust short-circuit protection while sustaining 1A continuous output under thermal derating. |
| PGOOD Threshold | ±7.5% output window with 32-cycle blanking delay - prevents false fault triggering during transient load steps in embedded computing systems. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed pad (Pin 9 = GND), rated for –40°C to 125°C junction temperature, θJA = 40°C/W, θJC = 10°C/W. Exposed pad must be soldered to PCB ground 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 connection to minimize EMI and voltage overshoot. |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - requires local 10µF ceramic bypass placed adjacent to pin. |
| RUN (Pin 3) | Enable Control | Active-high logic input; pulls regulator out of shutdown - must not float; tied to VIN or microcontroller GPIO for power sequencing. |
| FB (Pin 5) | Feedback Input | Senses divided output voltage; sets VOUT = 0.6V × (1 + R2/R1); input bias current ≤10nA enables high-impedance dividers. |
| INTVCC (Pin 6) | Internal LDO Output | 3.6V regulated supply for gate drivers and analog circuitry - requires ≥1µF ceramic bypass to GND for stability. |
| MODE/SYNC (Pin 7) | Operating Mode & Sync Input | Selects Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), forced continuous (1V–VINTVCC–1.2V), or external clock sync (±40% range). |
| PGOOD (Pin 4) | Power Good Indicator | Open-drain output pulled high when VOUT is within ±7.5%; internal 275Ω pull-down activates on fault - used for system power sequencing and fault logging. |
| SGND (Pin 8) | Signal Ground | Separate analog ground return for FB, MODE/SYNC, and PGOOD - routed independently from power GND to minimize noise coupling into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | <3.5µA shutdown IQ enables multi-year battery life in always-on portable instrumentation and emergency communication devices. |
| High-Frequency Operation | 2.25MHz fixed switching frequency reduces required inductor size to ≤2.2µH and enables full ceramic capacitor filtering without ESR-based stability concerns. |
| Three Selectable Operating Modes | Burst Mode (max efficiency at light loads), pulse-skipping (low ripple), and forced continuous (predictable EMI spectrum) - selected via single MODE/SYNC pin voltage. |
| Integrated Power Good Monitoring | Dedicated PGOOD pin with ±7.5% window and 32-cycle blanking ensures reliable system-level power sequencing and avoids false resets during dynamic load transients. |
| Thermally Enhanced MS8E Package | 8-lead MSOP with exposed pad (θJA = 40°C/W) delivers 2× better thermal performance than standard MSOP, supporting 1A continuous output at elevated ambient temperatures. |
Applications
| Automotive Emergency Radio | Portable Handheld Scanner |
|---|---|
|
Use Scenario: Powers baseband processor and RF front-end in battery-operated vehicle emergency radios requiring long shelf life and cold-crank operation down to 6V. IC Role / Device Role: Primary 3.3V/1.2V step-down regulator with PGOOD signaling to MCU for brown-out detection and graceful shutdown. Use Value: 2.25MHz operation minimizes inductor footprint in space-constrained enclosures; <3.5µA IQ preserves battery charge during multi-month standby. |
Use Scenario: Supplies configurable logic and image sensor in handheld barcode scanners powered by single-cell Li-ion (3.0–4.2V) or AA batteries. IC Role / Device Role: Adjustable buck converter delivering 1.8V core and 3.3V I/O rails with seamless transition between Burst Mode (idle) and forced continuous (scan active). Use Value: Independent SGND and PGOOD enable clean digital interface timing; ±1% accuracy ensures reliable ADC reference and memory interface margins. |
| Industrial Embedded Computing | Low-Power IoT Sensor Node |
|
Use Scenario: Provides stable 1.2V core and 3.3V peripheral voltage for ARM Cortex-M based controllers in factory automation gateways operating from 12–24V DC rails. IC Role / Device Role: High-efficiency primary DC/DC with external sync capability to align switching noise away from sensitive analog acquisition windows. Use Value: 2.25MHz sync range allows EMI reduction via clock dithering; thermal MS8E package sustains 1A output at 70°C ambient without heatsink. |
Use Scenario: Powers ultra-low-power microcontroller, BLE radio, and environmental sensors in battery-powered predictive maintenance nodes deployed in remote locations. IC Role / Device Role: Main system regulator operating in Burst Mode during sleep (10µA system current) and forced continuous during transmit bursts (100ms duration). Use Value: 0.6V feedback reference enables precise low-voltage rail generation; integrated soft-start prevents inrush current tripping source protection in energy-harvesting systems. |
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, no SGND separation, 17µA IQ in shutdown | Lacks dedicated PGOOD and signal/power ground isolation - less suitable for noise-sensitive analog systems or strict power sequencing requirements | Choose when board space is critical and PGOOD/SGND separation is unnecessary; verify loop stability with external compensation. |
| MP2315GJ-Z | 4.5V–28V input, 2MHz, 1.5A, no PGOOD, no MODE pin, 25µA IQ, DFN-8 package only | Higher minimum input voltage excludes 3.3V or single-cell Li-ion use; no programmable mode selection limits light-load optimization flexibility | Prefer for higher-VIN industrial supplies where 2.7V start-up and multi-mode operation are not required. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621EMS8E-2#PBF uniquely combines 2.25MHz operation, <3.5µA shutdown IQ, PGOOD monitoring, and isolated SGND in an MSOP package - making it optimal for battery-sensitive, noise-critical, and automotive-qualified designs where reliability and precision outweigh cost sensitivity.
Availability
LTC3621EMS8E-2#PBF is available at Aetrix Electronics and suitable for automotive emergency radios, portable handheld scanners, and industrial embedded computing requiring stable component supply, AEC-Q100-aligned reliability, and long-term production continuity.
Supply support for LTC3621EMS8E-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, industrial automation, communications, and automotive markets since 1965.
The LTC3621 family was designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in space- and power-constrained portable and automotive applications - emphasizing thermal robustness, mode flexibility, and system-level integration (PGOOD, SGND, sync).
FAQ
What is the switching frequency of the LTC3621EMS8E-2#PBF and can it be synchronized to an external clock?
The LTC3621EMS8E-2#PBF operates at a fixed 2.25MHz switching frequency with ±40% synchronization range. Connecting the MODE/SYNC pin to an external clock source within 1.35MHz–3.15MHz locks the LTC3621EMS8E-2#PBF to that frequency and forces continuous conduction mode - useful for EMI reduction in noise-sensitive systems.
Does the LTC3621EMS8E-2#PBF support adjustable output voltage, and what is the feedback reference voltage?
Yes, the LTC3621EMS8E-2#PBF supports fully adjustable output voltage from 0.6V to VIN using an external resistor divider on the FB pin. Its internal feedback reference voltage is precisely 0.6V with ±1% accuracy over temperature and line/load - enabling accurate generation of common rails like 1.2V, 1.8V, and 3.3V.
What are the operating modes supported by the MODE/SYNC pin of the LTC3621EMS8E-2#PBF?
The MODE/SYNC pin of the LTC3621EMS8E-2#PBF selects among four functional states: tie to INTVCC for Burst Mode® (ultralow IQ), tie to GND for pulse-skipping (low ripple), apply 1.0V–VINTVCC–1.2V for forced continuous mode (predictable EMI), or drive with external clock for synchronization - all without external components.
How does the PGOOD function work on the LTC3621EMS8E-2#PBF, and what is its accuracy window?
The PGOOD pin on the LTC3621EMS8E-2#PBF is an open-drain output that goes high when the regulated output is within ±7.5% of the target voltage. It includes a 32-cycle blanking delay to suppress false triggers during load transients - ensuring robust power sequencing in automotive and industrial systems using the LTC3621EMS8E-2#PBF.
What is the thermal performance of the LTC3621EMS8E-2#PBF in its MS8E package?
The LTC3621EMS8E-2#PBF in the thermally enhanced MS8E package has θJA = 40°C/W and θJC = 10°C/W. With the exposed pad properly soldered to PCB ground, it sustains 1A continuous output at up to 70°C ambient temperature without derating - significantly outperforming standard MSOP packages in high-density embedded applications.
LTC3621EMS8E-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
LTC3621EMS8E-2#PBF FAQ
1.How can I place an order for LTC3621EMS8E-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EMS8E-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 LTC3621EMS8E-2#PBF reliable?
The price and inventory of LTC3621EMS8E-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 LTC3621EMS8E-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621EMS8E-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EMS8E-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EMS8E-2#PBF?
LTC3621EMS8E-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EMS8E-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 LTC3621EMS8E-2#PBF?
For technical support, including LTC3621EMS8E-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EMS8E-2#PBF requirements.
6.How does Aetrix verify that LTC3621EMS8E-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EMS8E-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 LTC3621EMS8E-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621EMS8E-2#PBF?
All LTC3621EMS8E-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EMS8E-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 LTC3621EMS8E-2#PBF part is unused and in its original packaging.
Return procedure for LTC3621EMS8E-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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