My Inquiry
My Account
Analog Devices Inc. LTC3621IMS8E#PBF
- Part No.:
- LTC3621IMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621IMS8E#PBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,114
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3621IMS8E#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 operates from 2.7V–17V input, delivers adjustable 0.6V–VIN output, features 2.25MHz fixed switching frequency, <3.5µA quiescent current in shutdown, and ±1% output voltage accuracy - deployed in automotive infotainment power rails and portable handheld scanners.
For engineers reviewing the LTC3621IMS8E#PBF datasheet, LTC3621IMS8E#PBF pinout, LTC3621IMS8E#PBF application, or LTC3621IMS8E#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (Burst/Pulse-Skipping/Forced Continuous), real-world efficiency curves at 2.25MHz, and direct alternative part comparisons for automotive-grade DC/DC design.
Technical Context
The LTC3621IMS8E#PBF implements a constant-frequency peak current mode control architecture with internal compensation and 800µs soft-start. Its 2.25MHz oscillator supports ±40% external synchronization via MODE/SYNC pin, enabling EMI-sensitive applications like automotive ADAS sensors.
It integrates dual MOSFETs (top PMOS, bottom NMOS), overtemperature protection, VIN overvoltage lockout (19V trip), and VINTVCC LDO (3.6V). The MS8E package includes dedicated SGND pin for noise-sensitive feedback routing and open-drain PGOOD with ±7.5% window and 32-cycle blanking delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery systems including cold-crank (6V) and load-dump (16V) conditions. |
| Output Voltage Range | 0.6V to VIN - enables precise core voltage regulation for low-voltage MCUs (e.g., 1.2V, 1.8V) without external dividers for fixed options. |
| Switching Frequency | 2.25MHz (±10% typical) - allows use of compact 2.2µH inductors and reduces EMI fundamental below 30MHz CISPR limits. |
| Quiescent Current | <3.5µA in shutdown - extends battery life in always-on emergency radio and telematics modules during sleep states. |
| Output Accuracy | ±1% over –40°C to 125°C - ensures reliable ADC reference supply and sensor biasing across full automotive temperature range. |
| Peak Current Limit | 1.60A (I-grade) - sustains 1A continuous output with margin for transient loads in embedded computing power domains. |
| PGOOD Threshold | ±7.5% of VOUT - provides robust power sequencing signal for FPGA or DSP startup in industrial controllers. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND); rated for –40°C to 125°C junction temperature; θJA = 40°C/W.
| 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 with minimal loop area to reduce EMI. |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers; bypassed with ≥10µF ceramic capacitor near pin. |
| RUN (Pin 3) | Enable Control Input | Active-high logic input; must not float; pulls regulator into shutdown when grounded - used for system-level power gating. |
| FB (Pin 5) | Feedback Reference Input | Senses resistor divider output; regulates VOUT to 0.6V reference; accuracy directly determines output voltage tolerance. |
| MODE/SYNC (Pin 7) | Operating Mode & Clock Sync | Selects Burst Mode (tie to INTVCC), Pulse-Skipping (tie to GND), Forced Continuous (1V–2.4V), or external clock sync (±40%). |
| INTVCC (Pin 6) | Internal LDO Output | 3.6V regulated supply for internal circuitry; bypassed with ≥1µF ceramic cap to SGND - critical for stable gate drive. |
| PGOOD (Pin 4) | Power Good Indicator | Open-drain output pulled high externally; asserts after regulation achieved; deasserts within 32 cycles if VOUT drifts >±7.5%. |
| SGND (Pin 8) | Signal Ground Reference | Dedicated ground for FB, MODE/SYNC, and PGOOD - isolated from power ground to prevent noise coupling into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to <3.5µA at light loads while maintaining regulation - extends runtime in battery-powered portable scanners. |
| 2.25MHz Fixed Switching | Enables use of sub-3mm footprint inductors and avoids AM band interference - ideal for space-constrained automotive head units. |
| Independent SGND Pin | Separates analog feedback ground from power ground plane - improves PSRR and prevents switching noise from corrupting FB voltage. |
| PGOOD with Blanking Delay | 32-cycle delay prevents false trips during load transients - ensures reliable power sequencing in multi-rail FPGA systems. |
| AEC-Q100 Qualified | Rated for automotive applications (I-grade: –40°C to 125°C) - meets reliability requirements for infotainment and body electronics. |
Applications
| Automotive Infotainment Power | Portable Handheld Scanners |
|---|---|
Use Scenario: Powering SoC cores and DDR memory in vehicle navigation systems requiring clean, low-noise 1.2V/1.8V rails. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated output with PGOOD signaling for safe SoC boot sequence. Use Value: 2.25MHz operation minimizes inductor size and avoids AM radio band; ±1% accuracy ensures stable processor voltage under thermal stress. |
Use Scenario: Battery-powered barcode scanner with intermittent active periods and long standby intervals. IC Role / Device Role / Timing Role: Main system regulator managing deep-sleep (Burst Mode) and active (Forced Continuous) states. Use Value: <3.5µA shutdown IQ extends lithium primary cell life beyond 2 years; PGOOD confirms rail readiness before scan trigger. |
| Industrial Embedded Controllers | Emergency Radio Systems |
Use Scenario: DIN-rail mounted PLC I/O module needing isolated 3.3V logic supply from 24V bus. IC Role / Device Role / Timing Role: Non-isolated buck stage providing tightly regulated 3.3V for microcontroller and CAN transceiver. Use Value: Wide 2.7V–17V input accommodates brownout and surge events; AEC-Q100 qualification adds field reliability assurance. |
Use Scenario: Emergency responder radio with backup LiFePO₄ battery (nominal 3.2V) and solar charging input up to 17V. IC Role / Device Role / Timing Role: Adaptive buck regulator maintaining 5V USB output across variable input sources. Use Value: Full dropout operation at low VIN preserves runtime during battery depletion; zero-current shutdown prevents battery drain. |
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, 3MHz switching, no PGOOD or SGND pin, 2.5µA IQ in shutdown | Lacks dedicated signal ground and power-good output - unsuitable for noise-sensitive or sequenced systems | Prefer LTC3621IMS8E#PBF where PGOOD timing control and analog ground separation are required. |
| MP2315GJ-Z | 4.5V–28V input, 2MHz switching, no MODE/SYNC flexibility, 25µA IQ in shutdown | Higher minimum input voltage excludes 3.3V battery operation; higher IQ reduces standby time | Choose LTC3621IMS8E#PBF for sub-4.5V input support and ultra-low IQ in portable designs. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621IMS8E#PBF uniquely combines AEC-Q100 qualification, independent SGND, PGOOD with programmable blanking, and <3.5µA shutdown IQ - making it the only option meeting full automotive sequencing and battery longevity requirements.
Availability
LTC3621IMS8E#PBF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, portable handheld scanners, and industrial embedded controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3621IMS8E#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 LTC3621IMS8E#PBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC regulators designed specifically for automotive, portable, and space-constrained embedded applications demanding ultralow IQ and robust thermal performance.
FAQ
What is the maximum input voltage rating for the LTC3621IMS8E#PBF?
The LTC3621IMS8E#PBF has an absolute maximum input voltage rating of 17V. It also includes VIN overvoltage lockout that suspends operation above 19V (rising threshold) with 300mV hysteresis, protecting internal MOSFETs during load-dump transients common in automotive 12V systems. This ensures safe operation even with momentary spikes.
Does the LTC3621IMS8E#PBF support external frequency synchronization?
Yes, the LTC3621IMS8E#PBF supports external clock synchronization via the MODE/SYNC pin. It locks to an external clock within ±40% of its nominal 2.25MHz frequency, entering forced continuous mode upon sync engagement. This capability is used in automotive systems to avoid EMI peaks overlapping with critical receiver bands.
How does the PGOOD function work on the LTC3621IMS8E#PBF?
The LTC3621IMS8E#PBF's PGOOD pin is an open-drain output that goes high when VOUT is within ±7.5% of the target value. It includes a 32-cycle blanking delay on the falling edge to suppress false triggers during load transients. External pull-up is required, and the internal 275Ω pull-down activates when regulation is lost - enabling precise power sequencing in multi-rail systems.
What is the purpose of the SGND pin on the LTC3621IMS8E#PBF?
The SGND (Signal Ground) pin on the LTC3621IMS8E#PBF provides a dedicated return path for sensitive analog nodes - FB, MODE/SYNC, and PGOOD - isolating them from noisy power ground currents. This separation improves feedback accuracy, reduces ripple-induced regulation error, and enhances overall PSRR, especially critical in automotive and industrial noise environments.
Can the LTC3621IMS8E#PBF operate in dropout mode, and how is it handled?
Yes, the LTC3621IMS8E#PBF supports full dropout operation down to VIN ≈ VOUT. In forced continuous mode, the top PMOS switch remains fully on; in Burst or pulse-skipping modes, it transitions in/out of sleep to maintain regulation while minimizing IQ. Internal slope compensation maintains stability up to 100% duty cycle - essential for battery-powered systems nearing end-of-discharge.
LTC3621IMS8E#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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC3621IMS8E#PBF FAQ
1.How can I place an order for LTC3621IMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IMS8E#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#PBF reliable?
The price and inventory of LTC3621IMS8E#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3621IMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IMS8E#PBF?
LTC3621IMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IMS8E#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#PBF?
For technical support, including LTC3621IMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IMS8E#PBF requirements.
6.How does Aetrix verify that LTC3621IMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IMS8E#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3621IMS8E#PBF?
All LTC3621IMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IMS8E#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#PBF part is unused and in its original packaging.
Return procedure for LTC3621IMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3621IMS8E#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…
