My Inquiry
My Account
Analog Devices Inc. LTC3621IMS8E-23.3#PBF
- Part No.:
- LTC3621IMS8E-23.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621IMS8E-23.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,988
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3621IMS8E-23.3#PBF from Analog Devices is a 2.25MHz, 3.3V fixed-output synchronous step-down regulator delivering up to 1A output current with 3.5µA quiescent current and ±1% output voltage accuracy. It operates from 2.7V to 17V input, supports Burst Mode™, pulse-skipping, and forced continuous operation, and integrates power-good indication and thermal protection - ideal for space-constrained industrial and automotive power rails.
For engineers reviewing the LTC3621IMS8E-23.3#PBF datasheet, LTC3621IMS8E-23.3#PBF pinout, LTC3621IMS8E-23.3#PBF application, or LTC3621IMS8E-23.3#PBF equivalent, key selection considerations include its MS8E package with SGND and PGOOD pins, 2.25MHz switching frequency with ±40% sync range, ultralow IQ in shutdown, and fixed 3.3V output with no external feedback divider required.
Technical Context
The LTC3621IMS8E-23.3#PBF implements a constant-frequency peak current-mode control architecture with internal compensation and 800µs soft-start. Its 2.25MHz oscillator enables compact filter design using small inductors (e.g., 2.2µH) and ceramic capacitors while maintaining stable regulation across 2.7V–17V input and full-load-to-zero-load transitions.
It features three selectable operating modes via the MODE/SYNC pin: Burst Mode™ (for <3.5µA IQ at light load), pulse-skipping (for low VOUT ripple), and forced continuous mode (for EMI-sensitive applications). The MS8E package includes dedicated SGND and PGOOD pins, enabling precise signal referencing and reliable system power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (no external resistor divider needed - simplifies BOM and layout) |
| Switching Frequency | 2.25MHz ±10% (enables use of sub-3mm inductors and reduces EMI fundamental frequency) |
| Quiescent Current | 3.5µA in Burst Mode™ (extends battery life in always-on portable or emergency radio systems) |
| Input Voltage Range | 2.7V to 17V (supports wide-input industrial rails and automotive cold-crank conditions) |
| Output Current | 1A continuous (sufficient for powering microcontrollers, sensors, and RF modules) |
| PGOOD Accuracy | ±7.5% window with 32-cycle blanking delay (prevents false fault triggers during load transients) |
| Thermal Protection | Overtemperature shutdown at TJ ≥ 150°C (protects against sustained overload in sealed enclosures) |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed pad (Pin 9 = GND); thermally enhanced for 40°C/W θJA; requires soldered exposed pad for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt switching waveform - requires tight loop layout and Kelvin connection |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - bypass with ≥10µF ceramic near pin |
| RUN (Pin 3) | Enable control | Active-high logic input; <0.3V disables regulator, >1.0V enables - must not float |
| FB (Pin 5) | Feedback reference | Internally tied to 3.3V output; no external resistors required for fixed-output version |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for gate drivers; bypass with ≥1µF ceramic to SGND |
| MODE/SYNC (Pin 7) | Mode selection & clock sync | Tie to INTVCC for Burst Mode™, GND for pulse-skipping, or external 2.25MHz ±40% clock for forced continuous sync |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output pulled high when VOUT is within ±7.5% of 3.3V; 32-cycle blanking prevents transient glitches |
| SGND (Pin 8) | Signal ground | Dedicated low-noise reference 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 systems |
| Fixed 3.3V Output | Eliminates external feedback resistors, saving board space and reducing component count and tolerance drift |
| 2.25MHz Switching | Enables use of 2.2µH inductors and 22µF ceramic output caps - cuts solution size by >40% vs 1MHz designs |
| PGOOD with Blanking | 32-cycle delay on PGOOD deassertion prevents false faults during dynamic load steps or input transients |
| MS8E Package with SGND | Dedicated signal ground pin isolates noise-sensitive analog circuitry from power return paths |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
|
Use Scenario: Powering ultra-low-power MCU, I²C temperature/humidity sensor, and BLE radio in a sealed outdoor enclosure. IC Role / Device Role: Primary 3.3V rail generator with zero external components beyond inductor and caps. Use Value: 3.5µA quiescent current extends 2×AA battery life to >5 years; 2.25MHz operation avoids audible noise and meets CISPR-25 Class 5 EMI limits. |
Use Scenario: Supplying 3.3V to CAN transceiver, LIN interface, and door-lock MCU in 12V vehicle electrical system. IC Role / Device Role: Input-rail tolerant buck converter handling cold-crank (6.5V) and load-dump (18V) transients. Use Value: 2.7V–17V input range and VIN OVP (19V trip) ensure robust operation; AEC-Q100 qualified I-grade version available. |
| Portable Handheld Scanner | Emergency Radio System |
|
Use Scenario: Power management for barcode scanner with laser diode driver, CMOS imager, and ARM Cortex-M4. IC Role / Device Role: High-efficiency 3.3V source supporting burst-mode imaging and sleep states. Use Value: 95% peak efficiency at 500mA and <3.5µA shutdown current maximize runtime between charges. |
Use Scenario: Critical 3.3V rail for SDR receiver, audio amplifier, and flash memory in battery-powered emergency comms unit. IC Role / Device Role: Always-on regulator with guaranteed startup down to 2.7V and zero-current shutdown. Use Value: Full dropout operation preserves output during battery sag; PGOOD enables safe firmware reset on undervoltage. |
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 VOUT, 2.25MHz, 3.6µA IQ, no PGOOD or SGND pin | Lacks dedicated signal ground and power-good output - requires external monitoring circuitry | Choose when adjustable output and lower cost outweigh need for integrated PGOOD/SGND |
| MP2315GJ-Z | 4.5V–28V input, 3.3V fixed, 2MHz, 22µA IQ, no sync or mode selection | Higher IQ and no Burst Mode™ - unsuitable for multi-year battery operation | Choose only for higher VIN applications where 28V rating is mandatory and IQ is secondary |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621IMS8E-23.3#PBF uniquely combines fixed 3.3V output, 3.5µA IQ, PGOOD with blanking, SGND separation, and 2.25MHz sync capability - making it optimal for precision, low-power, and automotive-qualified designs requiring minimal external components.
Availability
LTC3621IMS8E-23.3#PBF is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, and portable handheld scanners requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant variants.
Supply support for LTC3621IMS8E-23.3#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 series was designed specifically for ultra-low-power, wide-input-voltage DC/DC conversion in space- and energy-constrained applications - emphasizing quiescent current optimization, integrated protection, and compact MSOP/DFN packaging.
FAQ
What is the output voltage tolerance of the LTC3621IMS8E-23.3#PBF?
The LTC3621IMS8E-23.3#PBF delivers a fixed 3.3V output with ±1% initial accuracy over temperature and line/load conditions. This is specified as 3.267V to 3.333V at TJ = –40°C to 125°C per the Electrical Characteristics table, eliminating need for external trimming or calibration in most applications.
Does the LTC3621IMS8E-23.3#PBF require external feedback resistors?
No. The LTC3621IMS8E-23.3#PBF is the fixed 3.3V variant - its FB pin is internally connected to the regulated output, so no external resistor divider is required. This reduces BOM count, PCB area, and potential errors from resistor tolerance or layout parasitics.
How does the PGOOD function work on the LTC3621IMS8E-23.3#PBF?
The PGOOD pin on the LTC3621IMS8E-23.3#PBF is an open-drain output that goes high when VOUT is within ±7.5% of 3.3V (i.e., 3.05V–3.55V). It includes a 32-switching-cycle blanking delay on the falling edge to suppress false triggers during load transients or input dips.
Can the LTC3621IMS8E-23.3#PBF synchronize to an external clock?
Yes. The MODE/SYNC pin of the LTC3621IMS8E-23.3#PBF accepts an external clock signal within ±40% of its nominal 2.25MHz frequency (i.e., 1.35MHz–3.15MHz). When synchronized, the device operates in forced continuous mode and locks to the external frequency within 2–3 cycles.
What thermal performance can be expected from the LTC3621IMS8E-23.3#PBF in MS8E package?
The LTC3621IMS8E-23.3#PBF in MS8E package has θJA = 40°C/W and θJC = 10°C/W. With proper PCB copper pour under the exposed pad, it sustains 1A continuous output at ambient temperatures up to 85°C without derating - verified by thermal characterization in the datasheet Rev. D.
LTC3621IMS8E-23.3#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):
- 3.3V
- 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-23.3#PBF FAQ
1.How can I place an order for LTC3621IMS8E-23.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IMS8E-23.3#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-23.3#PBF reliable?
The price and inventory of LTC3621IMS8E-23.3#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-23.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621IMS8E-23.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IMS8E-23.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IMS8E-23.3#PBF?
LTC3621IMS8E-23.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IMS8E-23.3#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-23.3#PBF?
For technical support, including LTC3621IMS8E-23.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IMS8E-23.3#PBF requirements.
6.How does Aetrix verify that LTC3621IMS8E-23.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IMS8E-23.3#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-23.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621IMS8E-23.3#PBF?
All LTC3621IMS8E-23.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IMS8E-23.3#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-23.3#PBF part is unused and in its original packaging.
Return procedure for LTC3621IMS8E-23.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3621IMS8E-23.3#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…
