My Inquiry
My Account
Analog Devices Inc. LTC3621IMS8E-25#PBF
- Part No.:
- LTC3621IMS8E-25#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621IMS8E-25#PBF.pdf
- Description:
- IC REG BUCK 5V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,657
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3621IMS8E-25#PBF from Analog Devices is a 2.25MHz, 17V input, 5V fixed-output synchronous step-down regulator in thermally enhanced MSOP-8 package with Power Good output and independent SGND pin. It delivers up to 1A output current, maintains ±1% output voltage accuracy over temperature, operates down to 2.7V input, and achieves 95% peak efficiency - ideal for space-constrained automotive and industrial power rails.
For engineers reviewing the LTC3621IMS8E-25#PBF datasheet, LTC3621IMS8E-25#PBF pinout, LTC3621IMS8E-25#PBF application, or LTC3621IMS8E-25#PBF equivalent, this page provides verified technical context, real-world operating parameters, validated alternative options, and supply-chain-ready availability details specific to the -25 fixed 5V variant in MS8E package.
Technical Context
The LTC3621IMS8E-25#PBF implements a constant-frequency, peak current-mode control architecture with internal compensation and 800µs soft-start. Its 2.25MHz switching frequency enables compact external components while supporting full dropout operation down to VIN = VOUT.
It integrates both PMOS high-side and NMOS low-side power switches (RDS(ON) = 0.37Ω / 0.15Ω), features ultralow 3.5µA quiescent current in Burst Mode, and supports three operating modes-Burst, pulse-skipping, and forced continuous-via the MODE/SYNC pin, with PGOOD monitoring ±7.5% output regulation window.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% over –40°C to 125°C junction temperature |
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery-supplied systems |
| Switching Frequency | 2.25MHz ±10% - enables use of sub-3mm inductors and reduces EMI filtering burden |
| Max Output Current | 1A continuous - sustained at full load with thermal derating per θJA = 40°C/W |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on portable or emergency radio applications |
| Power Good Accuracy | ±7.5% output window with 32-cycle blanking delay - prevents false fault triggering during transients |
| Thermal Rating | –40°C to 125°C operating junction temperature - qualified for industrial and automotive environments |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed pad (Pin 9 = GND); thermally enhanced layout supports 40°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connection point between internal PMOS/NMOS switches and external inductor - carries high di/dt square wave |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V input; powers internal LDO (INTVCC) and gate drivers |
| RUN (Pin 3) | Enable control | Active-high logic input; must be pulled high to enable regulation - floating not allowed |
| FB (Pin 5) | Feedback reference | Internally tied to 5V output via precision divider; no external resistor required for fixed-VOUT operation |
| PGOOD (Pin 4) | Output regulation monitor | Open-drain output asserting high when VOUT is within ±7.5% of 5V - used for system sequencing and fault detection |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for internal circuitry; requires ≥1µF ceramic bypass to SGND |
| 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 sync clock |
| SGND (Pin 8) | Signal ground reference | Dedicated low-noise ground return for FB, MODE/SYNC, and PGOOD - separate from power GND (exposed pad) |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ operation | 3.5µA quiescent current in Burst Mode enables >1-year battery life in 10µA standby systems |
| Integrated Power Good | PGOOD with ±7.5% window and 32-cycle blanking ensures reliable rail monitoring without external comparators |
| Thermally optimized MS8E | Exposed pad + SGND separation minimizes thermal resistance (θJA = 40°C/W) and improves noise immunity in noisy environments |
| Full dropout capability | Maintains regulation down to VIN = VOUT with active top-FET conduction - critical for brownout resilience |
| Three selectable modes | Burst (efficiency), pulse-skipping (low ripple), forced continuous (EMI control) - all configurable without external components |
Applications
| Automotive Infotainment Power Rail | Industrial Sensor Node DC/DC |
|---|---|
Use Scenario: Powering 5V microcontroller, CAN transceiver, and display interface in vehicle head unit under cold-crank (6V) and load-dump (18V) conditions. IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD sequencing, dropout operation, and AEC-Q100-compliant thermal performance. Use Value: Maintains 5V regulation across 6V–16V input range with <3.5µA sleep current, eliminating need for external supervisor IC. |
Use Scenario: Supplying 5V to low-power wireless sensor node (LoRaWAN/Bluetooth) powered by LiSOCl₂ battery with 10-year shelf life. IC Role / Device Role / Timing Role: Fixed-output step-down converter enabling ultra-low-IQ sleep mode and fast wake-up response. Use Value: Delivers 1A peak current for radio transmission while drawing only 3.5µA in standby - extends battery life beyond 10 years. |
| Portable Medical Handheld | Emergency Radio Power Management |
Use Scenario: Regulating 5V for ARM Cortex-M4 MCU, OLED display, and analog front-end in handheld ultrasound probe. IC Role / Device Role / Timing Role: Compact, low-noise 2.25MHz buck converter with dedicated SGND to isolate sensitive analog signals. Use Value: MS8E package fits 12mm × 12mm PCB area; 2.25MHz switching avoids audible noise and simplifies EMI filter design. |
Use Scenario: Providing stable 5V rail from 9V alkaline or rechargeable NiMH battery in emergency AM/FM radio with USB charging. IC Role / Device Role / Timing Role: High-efficiency, wide-input buck regulator supporting 2.7V start-up and full-load operation down to 3.2V battery. Use Value: Operates continuously from fresh to depleted battery (9V → 3.2V), delivering >90% efficiency at 100mA load - maximizes runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.0V–17V input, adjustable 0.9V–6.0V output; 3.0MHz switching; no PGOOD or SGND separation | Requires external feedback resistors and power-good comparator; less suitable for noise-sensitive analog systems | Choose when adjustable output and higher frequency are prioritized over integrated PGOOD and signal-ground isolation |
| MP2315GJ-Z | 4.5V–28V input, fixed 5V output; 500kHz switching; 25µA IQ; no PGOOD or thermal grade certification | Lacks automotive qualification, PGOOD, and low-IQ burst mode - limited to cost-sensitive consumer applications | Choose for non-automotive, non-battery-critical 5V rails where board space and BOM count are primary constraints |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621IMS8E-25#PBF uniquely combines AEC-Q100 qualification, integrated PGOOD with blanking, dedicated SGND, and 3.5µA IQ - making it the only option qualified for automotive infotainment and long-life battery-powered industrial sensors.
Availability
LTC3621IMS8E-25#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and portable medical devices requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for LTC3621IMS8E-25#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 industrial, automotive, communications, and healthcare markets.
The LTC3621 family is designed for high-efficiency, low-quiescent-current DC/DC conversion in space- and power-constrained applications - especially where wide input range, precise fixed outputs, and automotive reliability are required.
FAQ
What is the output voltage tolerance of the LTC3621IMS8E-25#PBF over temperature?
The LTC3621IMS8E-25#PBF delivers a fixed 5.0V output with ±1% accuracy over its full –40°C to 125°C operating junction temperature range, as specified in the Electrical Characteristics table under VOUT for LTC3621-5/LTC3621-25 variants. This tight tolerance eliminates need for post-regulation trimming in precision 5V rail applications.
Does the LTC3621IMS8E-25#PBF require external feedback resistors?
No, the LTC3621IMS8E-25#PBF does not require external feedback resistors. As a fixed 5V output variant, its internal resistor divider connects the FB pin directly to the output, satisfying the VOUT = 0.6V × (1 + R2/R1) equation with factory-trimmed ratios - simplifying layout and reducing BOM count.
How does the PGOOD function behave during load transients on the LTC3621IMS8E-25#PBF?
The LTC3621IMS8E-25#PBF asserts PGOOD high only when VOUT remains within ±7.5% of 5V for at least 32 switching cycles. During load transients, the 32-cycle blanking delay prevents false low assertions, ensuring PGOOD remains valid for system sequencing and fault reporting without spurious glitches.
Can the LTC3621IMS8E-25#PBF operate with input voltage below 2.7V?
No, the LTC3621IMS8E-25#PBF has a hard undervoltage lockout threshold of 2.7V (typical) on VIN. Below this, the device shuts down completely and draws only 0.1µA. It will not regulate or sustain output when VIN drops below 2.7V - consistent with Absolute Maximum Ratings and Electrical Characteristics specifications.
What is the thermal performance difference between the MS8E and DFN packages for the LTC3621IMS8E-25#PBF?
The LTC3621IMS8E-25#PBF in MS8E package has θJA = 40°C/W, significantly lower than the DFN variant's θJA = 64°C/W. This 37.5% improvement enables higher continuous output current at ambient temperatures up to 85°C without heatsinking - critical for enclosed automotive and industrial enclosures.
LTC3621IMS8E-25#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:
- 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:
- 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-25#PBF FAQ
1.How can I place an order for LTC3621IMS8E-25#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IMS8E-25#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-25#PBF reliable?
The price and inventory of LTC3621IMS8E-25#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-25#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621IMS8E-25#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IMS8E-25#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IMS8E-25#PBF?
LTC3621IMS8E-25#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IMS8E-25#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-25#PBF?
For technical support, including LTC3621IMS8E-25#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IMS8E-25#PBF requirements.
6.How does Aetrix verify that LTC3621IMS8E-25#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IMS8E-25#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-25#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621IMS8E-25#PBF?
All LTC3621IMS8E-25#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IMS8E-25#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-25#PBF part is unused and in its original packaging.
Return procedure for LTC3621IMS8E-25#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3621IMS8E-25#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
