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Analog Devices Inc. LTC3621HMS8E-23.3#PBF
- Part No.:
- LTC3621HMS8E-23.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621HMS8E-23.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,819
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Product details
Overview
LTC3621HMS8E-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 over –40°C to 150°C junction temperature. It operates from 2.7V to 17V input, supports Burst Mode™, pulse-skipping, and forced continuous operation, and integrates Power Good (PGOOD) and independent signal ground (SGND) in an 8-lead MSOP package - used in automotive emergency radios and industrial embedded power rails.
For engineers reviewing the LTC3621HMS8E-23.3#PBF datasheet, LTC3621HMS8E-23.3#PBF pinout, LTC3621HMS8E-23.3#PBF application, or LTC3621HMS8E-23.3#PBF equivalent, this page delivers verified specifications, thermal-grade packaging details, PGOOD timing behavior, mode-select logic thresholds, and real-world efficiency vs. load curves at 2.25MHz for rapid power architecture validation.
Technical Context
The LTC3621HMS8E-23.3#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 ±40% sync range allows alignment to system clocks without jitter accumulation.
It features three selectable operating modes via MODE/SYNC pin: Burst Mode™ (MODE/SYNC = INTVCC) for ultralow IQ, pulse-skipping (MODE/SYNC = GND) for minimal VOUT ripple, and forced continuous mode (1V ≤ MODE/SYNC ≤ VINTVCC–1.2V) for predictable EMI and zero-load stability - all maintaining ±1% output regulation across 2.7V–17V VIN and full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V with ±1% accuracy (3.267V–3.333V) - eliminates external feedback divider and ensures stable MCU core rail under load transients. |
| Switching Frequency | 2.25MHz (±20% over temp) - enables use of sub-3mm inductors and reduces output capacitor size for space-constrained automotive modules. |
| Quiescent Current | 3.5µA in Burst Mode™ - extends battery life in always-on emergency radio standby states without compromising wake-up response. |
| Max Output Current | 1A continuous - supports dual-core microcontrollers and CAN transceivers in AEC-Q100-compliant systems. |
| Operating Temp Range | –40°C to +150°C junction - qualified for under-hood automotive applications where ambient exceeds 125°C. |
| Input Voltage Range | 2.7V to 17V - accommodates cold-crank (6.5V) and load-dump (18V) conditions per ISO 16750-2 when paired with external TVS. |
| PGOOD Accuracy | ±7.5% window with 32-cycle blanking delay - prevents false fault assertions during dynamic load steps in industrial PLC I/O modules. |
Pinout & Package
Package: 8-lead plastic MSOP (MS8E) with exposed pad (Pin 9 = GND), rated for 150°C junction temperature and θJA = 40°C/W. Requires soldered thermal pad for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square wave - requires tight layout with low-inductance path to minimize EMI and voltage overshoot. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - must be bypassed with ≥10µF ceramic capacitor near pin. |
| RUN (Pin 3) | Enable control | Active-high logic input; <0.3V disables regulator, >1.0V enables - pulled high via resistor for default-on operation in automotive ECUs. |
| FB (Pin 5) | Feedback reference | Internally tied to 3.3V output; no external divider needed - simplifies layout and improves noise immunity for fixed-output configuration. |
| INTVCC (Pin 6) | Bias LDO output | 3.6V regulated supply for internal circuitry - requires ≥1µF ceramic bypass to GND for stable gate drive and error amplifier operation. |
| MODE/SYNC (Pin 7) | Mode selection & clock sync | Configures Burst Mode™ (to INTVCC), pulse-skipping (to GND), or forced continuous (1V–2.4V); accepts external 1.35–3.15MHz sync clock. |
| PGOOD (Pin 4) | Power-good indicator | Open-drain output pulled high externally; asserts high after regulation achieved, blanks for 32 cycles during transients - used for processor reset sequencing. |
| SGND (Pin 8) | Signal ground | Separate analog ground return for FB, MODE/SYNC, and PGOOD - isolates noise-sensitive control signals from power ground currents. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualification | H-grade (–40°C to +150°C) with automotive reliability testing - meets stress test requirements for engine control and ADAS power supplies. |
| Integrated PGOOD with blanking | 32-cycle delay prevents false triggers during load steps - enables robust power sequencing in multi-rail systems without external timers. |
| Three-mode operation | Burst Mode™ (3.5µA IQ), pulse-skipping (low ripple), forced continuous (EMI-controlled) - selectable per system-level trade-off without hardware change. |
| Full dropout capability | Maintains regulation down to VIN = VOUT with PMOS top switch fully on - sustains operation during battery brownout in telematics modules. |
| Internal soft-start | 800µs monotonic ramp - prevents inrush current and output overshoot during cold start in portable handheld scanners. |
Applications
| Automotive Emergency Radio | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers microcontroller, RF front-end, and audio codec in battery-backed vehicle emergency communication system requiring >10-year shelf life. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator with ultra-low IQ and PGOOD sequencing for safe boot and watchdog reset coordination. Use Value: 3.5µA quiescent current extends 12V lead-acid battery standby life beyond 5 years; 150°C rating survives under-dash mounting. |
Use Scenario: Supplies isolated digital I/O banks in DIN-rail mounted programmable logic controller operating in factory environments with wide ambient swings. IC Role / Device Role / Timing Role: Local point-of-load regulator delivering clean 3.3V to FPGA configuration memory and level-shifting buffers. Use Value: 2.25MHz switching avoids AM radio band interference; PGOOD blanking prevents spurious fault latching during solenoid actuation. |
| Portable Handheld Scanner | Embedded Telematics Gateway |
Use Scenario: Powers ARM Cortex-M7 SoC and CMOS image sensor in battery-operated barcode scanner with frequent sleep/wake cycles. IC Role / Device Role / Timing Role: High-efficiency step-down converter enabling Burst Mode™ operation during idle and forced continuous during scan bursts. Use Value: Seamless mode transition maintains 3.3V rail stability across 100µA–1A load range; MSOP package fits <10mm² PCB area budget. |
Use Scenario: Generates 3.3V rail for LTE modem, GNSS receiver, and CAN FD controller in automotive telematics unit exposed to engine bay thermal cycling. IC Role / Device Role / Timing Role: Automotive-grade buck regulator with integrated PGOOD for modem power-up handshake and thermal derating management. Use Value: –40°C to +150°C operation ensures functionality during hot-soak tests; 17V max VIN withstands ISO 7637-2 pulse 5a load dump events. |
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 | 3.0V–17V input, 3.3V fixed, 1.2A, 2.25MHz, 17µA IQ (not burst), no PGOOD, 6-pin WSON | Lacks PGOOD and thermal grade - unsuitable for automotive safety-critical sequencing or high-temp environments | Select only for cost-sensitive industrial controls where PGOOD and extended temperature are not required. |
| MP2315GJ-Z | 4.5V–28V input, 3.3V fixed, 1.5A, 2.2MHz, 22µA IQ, no PGOOD, no sync, 8-pin QFN | Higher VIN range but no PGOOD, no sync, and only rated to 125°C - cannot replace in AEC-Q100 or precise sequencing designs | Use only in non-automotive 24V systems where thermal margin and power-good signaling are secondary. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621HMS8E-23.3#PBF uniquely combines automotive temperature grade, integrated PGOOD with blanking, external clock sync, and 3.5µA Burst Mode™ IQ - making it irreplaceable in safety-aware, thermally demanding, or tightly sequenced power architectures.
Availability
LTC3621HMS8E-23.3#PBF is available at Aetrix Electronics and suitable for automotive emergency radios, industrial PLC I/O modules, portable handheld scanners, and embedded telematics gateways requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3621HMS8E-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 precision instrumentation, industrial automation, and automotive markets since 1965.
The LTC3621 family is designed for high-efficiency, low-quiescent-current DC/DC conversion in space- and power-constrained applications - specifically targeting automotive infotainment, industrial edge nodes, and portable medical devices requiring AEC-Q100 compliance and extended temperature operation.
FAQ
What is the maximum input voltage rating for LTC3621HMS8E-23.3#PBF?
The LTC3621HMS8E-23.3#PBF has an absolute maximum input voltage of 17V, with built-in VIN overvoltage lockout triggering at 19V (rising) and releasing at 18.7V. This protects internal MOSFETs during load-dump transients common in 12V automotive systems. Operation remains within specification up to 17V continuous input, and the device resumes normal regulation after overvoltage recovery with internal soft-start.
Does LTC3621HMS8E-23.3#PBF require an external feedback resistor network?
No, LTC3621HMS8E-23.3#PBF does not require an external feedback resistor network. As a fixed 3.3V output variant, the FB pin is internally connected to the regulated output. External resistors are unnecessary - simplifying layout, reducing component count, and improving noise immunity compared to adjustable versions like LTC3621HMS8E-2#PBF.
How does the PGOOD function behave during load transients on LTC3621HMS8E-23.3#PBF?
The PGOOD output on LTC3621HMS8E-23.3#PBF includes a 32-cycle blanking delay on the falling edge to prevent false deassertion during fast load steps. It asserts high within one switching cycle after output regulation is achieved and remains high until VOUT falls outside the ±7.5% window for more than 32 consecutive cycles - ensuring reliable power sequencing in FPGA or microcontroller boot sequences.
Can LTC3621HMS8E-23.3#PBF synchronize to an external clock?
Yes, LTC3621HMS8E-23.3#PBF can synchronize to an external clock applied to the MODE/SYNC pin. The sync range is ±40% of its nominal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz). Once locked, it operates in forced continuous mode at the external frequency with immediate phase alignment - critical for EMI reduction in synchronized multi-rail power systems.
What thermal performance can be expected from LTC3621HMS8E-23.3#PBF in a typical 2-layer PCB layout?
In a standard 2-layer PCB with 1oz copper and the exposed pad (Pin 9) fully soldered to a 2cm² thermal pad, LTC3621HMS8E-23.3#PBF achieves θJA ≈ 40°C/W. At 1A load and 12V input, power dissipation is ~0.3W, resulting in ~12°C rise above ambient - well within its 150°C max junction limit. For sustained 150°C ambient, derating to ~700mA is recommended per thermal simulation data.
LTC3621HMS8E-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621HMS8E-23.3#PBF FAQ
1.How can I place an order for LTC3621HMS8E-23.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621HMS8E-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 LTC3621HMS8E-23.3#PBF reliable?
The price and inventory of LTC3621HMS8E-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 LTC3621HMS8E-23.3#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621HMS8E-23.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621HMS8E-23.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621HMS8E-23.3#PBF?
LTC3621HMS8E-23.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621HMS8E-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 LTC3621HMS8E-23.3#PBF?
For technical support, including LTC3621HMS8E-23.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621HMS8E-23.3#PBF requirements.
6.How does Aetrix verify that LTC3621HMS8E-23.3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621HMS8E-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 LTC3621HMS8E-23.3#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621HMS8E-23.3#PBF?
All LTC3621HMS8E-23.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621HMS8E-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 LTC3621HMS8E-23.3#PBF part is unused and in its original packaging.
Return procedure for LTC3621HMS8E-23.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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