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Analog Devices Inc. LTC3621HMS8E-5#PBF
- Part No.:
- LTC3621HMS8E-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621HMS8E-5#PBF.pdf
- Description:
- IC REG BUCK 5V 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,628
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Product details
Overview
LTC3621HMS8E-5#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 delivers fixed 5V output at up to 1A, operates from 2.7V–17V input, achieves ±1% output voltage accuracy, and maintains 95% peak efficiency at 2.25MHz switching frequency. It serves as primary power supply for automotive infotainment modules requiring high reliability under wide temperature and transient load conditions.
For engineers reviewing the LTC3621HMS8E-5#PBF datasheet, LTC3621HMS8E-5#PBF pinout, LTC3621HMS8E-5#PBF application, or LTC3621HMS8E-5#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance at 150°C junction, real-world efficiency vs. load curves, and two rigorously cross-checked alternative parts for fixed 5V, 2.25MHz buck conversion in AEC-Q100-compliant designs.
Technical Context
The LTC3621HMS8E-5#PBF implements constant-frequency peak current mode control with internal compensation and 800µs soft-start. Its 2.25MHz switching frequency (±40% sync range) enables compact filter design using small 2.2µH inductors and ceramic capacitors.
It supports three operating modes via MODE/SYNC pin: pulse-skipping (low ripple), Burst Mode® (3.5µA IQ), and forced continuous (stable EMI). The MS8E package integrates dedicated SGND and exposed-pad GND for optimal noise isolation and thermal dissipation-critical for automotive applications where junction temperatures reach 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external feedback divider, reduces BOM count and layout sensitivity. |
| Switching Frequency | 2.25MHz (H-grade) - enables use of sub-3mm inductors and 10µF–22µF ceramic output capacitors. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery runtime in always-on automotive subsystems (e.g., telematics wake-up circuits). |
| Input Voltage Range | 2.7V to 17V - supports cold-crank (4.5V) and load-dump (18V) transients per ISO 7637-2 when paired with external protection. |
| Output Current | 1A continuous - sufficient for powering dual-core microcontrollers, CAN transceivers, and display drivers simultaneously. |
| Junction Temperature | –40°C to +150°C - qualified per AEC-Q100 Grade H, enabling placement near engine control units without derating. |
| Power Good Accuracy | ±7.5% window with 32-cycle blanking - prevents false resets during fast load transients in ADAS camera modules. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND). Thermally enhanced for θJA = 40°C/W and θJC = 10°C/W - requires soldered exposed pad to PCB ground plane for rated performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects directly to inductor; carries high di/dt square wave - must be routed short and wide 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 to GND. |
| RUN (Pin 3) | Enable control | Active-high logic input; <1.0V disables regulator, >1.0V enables - pulled low via resistor for controlled startup sequencing. |
| FB (Pin 5) | Feedback reference | Internally tied to 5V output; no external divider needed - simplifies layout and improves regulation stability. |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for gate drivers and logic - bypass with ≥1µF ceramic capacitor to SGND. |
| MODE/SYNC (Pin 7) | Mode selection & sync input | Ground = pulse-skipping; INTVCC = Burst Mode; 1V–2.4V = forced continuous; external clock = sync - configures trade-off between ripple and light-load efficiency. |
| PGOOD (Pin 4) | Output voltage monitor | Open-drain output pulled high when VOUT within ±7.5% of 5V - used for system power sequencing and fault detection. |
| SGND (Pin 8) | Signal ground reference | Dedicated low-noise ground for FB, MODE/SYNC, and PGOOD - must be isolated from power ground until single-point connection. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 3.5µA at light loads - critical for automotive modules drawing <100µA in sleep mode. |
| Integrated PGOOD with blanking | 32-cycle delay prevents false low assertions during dynamic load steps - ensures reliable reset signaling in safety-critical ECUs. |
| Thermally enhanced MS8E package | Exposes die pad as GND (Pin 9) and adds SGND (Pin 8) - separates noisy power return from sensitive analog references. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation - meets automotive under-hood temperature requirements without derating. |
| 2.25MHz ±40% sync capability | Enables EMI reduction by aligning switching frequency with system clock - avoids beat frequencies in radar and infotainment bands. |
Applications
| Automotive Infotainment Head Unit | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers ARM Cortex-A53 SoC, HDMI transmitter, and audio codec in vehicle head unit with 12V battery input. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering 1A continuous, synchronized to system clock to suppress conducted EMI. Use Value: 2.25MHz operation allows use of 2.2µH shielded inductor and 22µF X7R ceramic output cap - reduces solution size by 40% vs. 500kHz alternatives. |
Use Scenario: Supplies 5V to isolated RS-485 transceivers and microcontroller in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator with PGOOD monitoring for brown-out detection and safe shutdown. Use Value: ±1% output accuracy and ±7.5% PGOOD window ensure stable communication link even during 10% line sag on 24V industrial bus. |
| Emergency Vehicle Radio System | ADAS Camera Power Supply |
Use Scenario: Provides clean 5V rail to SDR-based radio front-end in police/fire/emergency response vehicles operating across wide temperature and vibration profiles. IC Role / Device Role / Timing Role: High-reliability buck regulator with Burst Mode® for standby operation and forced continuous for transmit bursts. Use Value: 3.5µA quiescent current extends battery backup runtime to >72 hours; 150°C junction rating survives under-hood mounting near exhaust routing. |
Use Scenario: Powers image sensor and ISP in forward-facing camera module requiring low-noise, ripple-free 5V supply. IC Role / Device Role / Timing Role: Low-ripple pulse-skipping mode regulator with dedicated SGND and PGOOD for fail-safe diagnostics. Use Value: Pulse-skipping mode reduces output voltage ripple to <15mVpp, preventing image artifacts in 12MP sensor streams. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output, high-frequency buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3V–17V input, 5V fixed, 3MHz, 95% efficiency, but only rated to 85°C ambient (no AEC-Q100 grade) | Lacks automotive qualification and PGOOD blanking - suitable for commercial industrial use only | Select only for non-automotive cost-sensitive designs where junction temperature stays below 125°C |
| MAX20004AATP+T | 3.5V–36V input, 5V fixed, 2.2MHz, AEC-Q100 Grade 1 (–40°C to +125°C), integrated soft-start | Wider VIN range but higher 15µA IQ in shutdown - less efficient in ultra-low-power wake-up scenarios | Prefer when input may exceed 17V (e.g., 24V truck systems); avoid if 3.5µA IQ is mandatory for battery longevity |
Compared with TPS62130ARGTR and MAX20004AATP+T, the LTC3621HMS8E-5#PBF uniquely combines AEC-Q100 Grade H (150°C), 3.5µA Burst Mode IQ, and dedicated SGND/PGOOD in an MSOP-8 package - making it the only choice for space-constrained, high-temperature automotive subsystems demanding both ultra-low standby power and robust fault reporting.
Availability
LTC3621HMS8E-5#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and emergency vehicle radio platforms requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3621HMS8E-5#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, Inc. 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 delivers ultralow-IQ, high-frequency synchronous buck regulation for battery-powered and automotive applications where efficiency, thermal resilience, and functional safety are critical - with the LTC3621HMS8E-5#PBF specifically engineered for AEC-Q100-compliant 5V power rails.
FAQ
What is the maximum junction temperature specification for the LTC3621HMS8E-5#PBF?
The LTC3621HMS8E-5#PBF is specified for operation from –40°C to +150°C junction temperature and is AEC-Q100 Grade H qualified. This allows direct mounting in high-temperature zones such as near engine control units or under-hood telematics modules without thermal derating. Its MS8E package features an exposed thermal pad (Pin 9) that must be soldered to PCB ground to achieve θJA = 40°C/W.
Does the LTC3621HMS8E-5#PBF require an external feedback resistor network?
No, the LTC3621HMS8E-5#PBF is a fixed 5V output variant - its FB pin is internally connected to the regulated output, eliminating the need for external resistors. This reduces component count, layout complexity, and potential drift errors associated with external dividers. The ±1% output accuracy is maintained over temperature and line/load conditions without user calibration.
How does the PGOOD function behave during output load transients on the LTC3621HMS8E-5#PBF?
The LTC3621HMS8E-5#PBF asserts PGOOD high only when VOUT remains within ±7.5% of 5V for at least 32 consecutive switching cycles. During fast load steps, the 32-cycle blanking delay prevents false low assertions, ensuring reliable power sequencing in safety-critical systems like ADAS cameras. PGOOD is open-drain and requires an external pull-up resistor to a valid logic voltage.
Can the LTC3621HMS8E-5#PBF synchronize to an external clock, and what is the acceptable frequency range?
Yes, the LTC3621HMS8E-5#PBF supports synchronization via its MODE/SYNC pin. When driven by an external clock, it locks to frequencies from 1.35MHz to 3.15MHz - a ±40% window around its nominal 2.25MHz oscillator. Sync engagement occurs within 2–3 external clock cycles, and loss of sync signal causes reversion to internal frequency within ~7µs.
What are the key differences between the MS8E and DFN packages for the LTC3621 family?
The LTC3621HMS8E-5#PBF uses the MS8E package, which adds Pin 4 (PGOOD) and Pin 8 (SGND) - absent in the 6-lead DFN variants. The MS8E's separate SGND pin isolates analog reference paths from power return noise, while its larger exposed pad and lower θJA (40°C/W vs. 64°C/W for DFN) enable higher power density in thermally constrained automotive layouts.
LTC3621HMS8E-5#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621HMS8E-5#PBF FAQ
1.How can I place an order for LTC3621HMS8E-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621HMS8E-5#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-5#PBF reliable?
The price and inventory of LTC3621HMS8E-5#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-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621HMS8E-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621HMS8E-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621HMS8E-5#PBF?
LTC3621HMS8E-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621HMS8E-5#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-5#PBF?
For technical support, including LTC3621HMS8E-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621HMS8E-5#PBF requirements.
6.How does Aetrix verify that LTC3621HMS8E-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621HMS8E-5#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-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621HMS8E-5#PBF?
All LTC3621HMS8E-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621HMS8E-5#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-5#PBF part is unused and in its original packaging.
Return procedure for LTC3621HMS8E-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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