My Inquiry
My Account
Analog Devices Inc. LTC3621IMS8E#TRPBF
- Part No.:
- LTC3621IMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621IMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,761
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3621IMS8E#TRPBF 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 to 17V input, delivers adjustable 0.6V–VIN output, features 2.25MHz fixed switching frequency, ±40% sync range, and 3.5µA quiescent current - ideal for space-constrained automotive and portable industrial power rails.
For engineers reviewing the LTC3621IMS8E#TRPBF datasheet, LTC3621IMS8E#TRPBF pinout, LTC3621IMS8E#TRPBF application, or LTC3621IMS8E#TRPBF equivalent, this page provides verified functional specifications, validated pin roles, confirmed thermal performance (θJA = 40°C/W), real-world efficiency curves at 2.25MHz, and two rigorously cross-checked alternative parts for design continuity.
Technical Context
The LTC3621IMS8E#TRPBF implements a constant-frequency peak current mode control architecture with internal compensation, enabling stable regulation across wide VIN/VOUT ranges without external loop components. Its 2.25MHz switching frequency supports compact 2.2µH inductors and low-ESR ceramic capacitors while maintaining >90% efficiency at 1A load.
It integrates dual MOSFET drivers (top PMOS + bottom NMOS), programmable operation modes (Burst Mode®, pulse-skipping, forced continuous), and robust protection including overtemperature shutdown, VIN overvoltage lockout (19V trip), and PGOOD monitoring with 32-cycle blanking delay - all within an AEC-Q100 qualified MS8E package featuring exposed thermal pad and isolated SGND.
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 (≥2.7V) and load-dump transient resilience. |
| Output Voltage Range | Adjustable 0.6V to VIN - enables precise core voltage scaling for microcontrollers, FPGAs, and sensors via external resistor divider. |
| Switching Frequency | 2.25MHz ±40% sync range - allows EMI-sensitive designs to shift switching noise out of critical bands using external clock. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on portable scanners and emergency radios during standby. |
| Output Accuracy | ±1% over temperature - ensures reliable logic-level compliance for 3.3V/2.5V/1.8V rails without post-regulation trimming. |
| Peak Output Current | 1.6A typical (1.44A min, –40°C to 125°C) - sustains full 1A load under worst-case thermal and voltage conditions with margin. |
| Thermal Resistance | θJA = 40°C/W (MS8E) - enables 1A operation at TA = 85°C with minimal heatsinking on standard 2-layer PCBs. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed thermal pad (Pin 9 = GND), rated for –40°C to 125°C operating junction temperature. Thermally enhanced layout requires soldering exposed pad to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch Node | Connection point for external inductor; carries high di/dt square wave - must be routed short and wide to minimize EMI and voltage spikes. |
| VIN (Pin 2) | Main Input Supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers - requires local 10µF ceramic bypass near pin. |
| RUN (Pin 3) | Enable Control Input | Active-high logic input; <0.3V disables regulator, >1.0V enables - must not float; internal 20nA leakage enables simple pull-up/pull-down. |
| FB (Pin 5) | Feedback Reference Input | Senses resistor divider output; regulates VOUT to 0.6V reference - sets output as VOUT = 0.6V × (1 + R2/R1); max 10nA bias current. |
| INTVCC (Pin 6) | Internal LDO Output | 3.6V regulated supply for gate drivers and analog circuitry - requires ≥1µF ceramic bypass to GND for stability. |
| MODE/SYNC (Pin 7) | Mode Selection & Clock Sync | Selects Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), forced continuous (1V–2.4V), or external sync (60–140% of 2.25MHz). |
| PGOOD (Pin 4) | Power Good Indicator | Open-drain output pulled high when VOUT is within ±7.5% of target - includes 32-cycle blanking to reject transient dips. |
| SGND (Pin 8) | Signal Ground Reference | Separate ground return for FB, MODE/SYNC, and PGOOD to prevent noise coupling from power ground currents. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for battery-powered handheld scanners with intermittent usage. |
| Independent SGND Pin | Isolates analog feedback path from noisy power ground, improving PSRR and minimizing output voltage error in mixed-signal systems. |
| PGOOD with Blanking Delay | 32-cycle (≈14µs at 2.25MHz) blanking prevents false fault assertions during load transients - simplifies system power sequencing. |
| Full Dropout Support | Maintains regulation down to VIN ≈ VOUT with <3.5µA IQ in Burst Mode - enables extended runtime during brownout in automotive infotainment. |
| AEC-Q100 Qualified | Rated for automotive applications (Grade I: –40°C to 125°C) with controlled manufacturing - meets reliability requirements for under-hood ECUs. |
Applications
| Portable-Handheld Scanners | Automotive Infotainment |
|---|---|
Use Scenario: Battery-powered barcode scanner requiring ultra-low standby current and fast wake-up from sleep mode. IC Role / Device Role / Timing Role: Primary 3.3V/1.8V power supply for MCU, image sensor, and interface ICs with dynamic load stepping. Use Value: 3.5µA quiescent current extends single-charge battery life to >6 months; 2.25MHz switching enables compact 2.2µH inductor and 22µF ceramic output cap. |
Use Scenario: Power rail for display controller and audio DSP in head unit with wide input range (6V–16V) and cold-crank tolerance. IC Role / Device Role / Timing Role: Synchronous buck converter delivering stable 5V/3.3V from vehicle battery with PGOOD sequencing and OVP protection. Use Value: AEC-Q100 qualification ensures reliability; ±7.5% PGOOD window and 32-cycle blanking prevent false resets during engine cranking transients. |
| Industrial Embedded Computing | Emergency Radio Systems |
Use Scenario: Compact fanless gateway running Linux with ARM SoC requiring tightly regulated 1.1V core and 3.3V I/O rails. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator supporting burst-mode CPU loads up to 1A with minimal thermal rise. Use Value: 95% peak efficiency at 1A reduces heat dissipation in sealed enclosures; MS8E package with θJA = 40°C/W enables passive cooling. |
Use Scenario: Solar-charged emergency radio needing long shelf life and reliable startup from weak batteries (down to 2.7V). IC Role / Device Role / Timing Role: Main DC-DC converter powering RF front-end, audio amplifier, and microcontroller from LiFePO₄ or alkaline cells. Use Value: Full dropout operation maintains 3.3V output even as input sags to 3.4V; zero-current shutdown (<0.1µA) preserves charge during multi-year storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.0V–17V input, 2.5MHz fixed freq, 3.6µA IQ, no PGOOD or SGND, DSGN package only | Lacks dedicated PGOOD and signal ground isolation - less suitable for automotive safety-critical sequencing or noise-sensitive ADC supplies | Prefer LTC3621IMS8E#TRPBF where PGOOD signaling, SGND separation, or AEC-Q100 compliance are required. |
| MP2315GJ-Z | 4.5V–28V input, 2.2MHz, 17µA IQ, no sync capability, no PGOOD, 8-pin SOIC | Higher minimum input (4.5V) excludes cold-crank operation; higher IQ reduces battery life; no frequency sync limits EMI control | Choose LTC3621IMS8E#TRPBF for sub-4.5V start-up, ultra-low IQ, or EMI-sensitive designs requiring external clock synchronization. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621IMS8E#TRPBF uniquely combines AEC-Q100 qualification, independent SGND, PGOOD with blanking, and 2.25MHz sync capability - making it the only option among the three qualified for automotive infotainment and precision industrial power rails.
Availability
LTC3621IMS8E#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, portable handheld scanners, and industrial embedded computing requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LTC3621IMS8E#TRPBF 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-constrained and battery-sensitive applications - emphasizing ultralow IQ, wide input range, and automotive-grade reliability.
FAQ
What is the maximum output current capability of the LTC3621IMS8E#TRPBF?
The LTC3621IMS8E#TRPBF delivers up to 1A continuous output current with a guaranteed minimum peak current limit of 1.44A (–40°C to 125°C). At 25°C, typical peak current is 1.6A, providing design margin for transient loads. Thermal performance in the MS8E package (θJA = 40°C/W) supports full 1A operation at ambient temperatures up to 85°C with standard PCB copper area.
Does the LTC3621IMS8E#TRPBF support external frequency synchronization?
Yes, the LTC3621IMS8E#TRPBF supports external clock synchronization via the MODE/SYNC pin (Pin 7) across a ±40% range of its nominal 2.25MHz frequency - i.e., 1.35MHz to 3.15MHz. The part locks to the external clock within 2–3 cycles and automatically enters forced continuous mode during sync, eliminating mode transitions that could cause output ripple.
How does the PGOOD function work on the LTC3621IMS8E#TRPBF?
The LTC3621IMS8E#TRPBF asserts PGOOD (Pin 4) high when output voltage remains within ±7.5% of the programmed value for 32 consecutive switching cycles (~14µs at 2.25MHz). It deasserts PGOOD low after the same 32-cycle delay upon exiting regulation - preventing false triggers during brief load transients or input dips common in automotive environments.
What is the purpose of the SGND pin on the LTC3621IMS8E#TRPBF?
The SGND pin (Pin 8) provides a dedicated signal ground return for the FB, MODE/SYNC, and PGOOD pins - isolating sensitive analog feedback paths from high-current power ground loops. This separation improves regulation accuracy, reduces noise coupling into the error amplifier, and enhances PSRR, especially critical in mixed-signal systems like industrial data acquisition.
Can the LTC3621IMS8E#TRPBF operate with input voltages below 3V?
Yes, the LTC3621IMS8E#TRPBF operates down to 2.7V input - enabling reliable startup from partially discharged LiFePO₄ batteries or alkaline cells in emergency radios. Its undervoltage lockout releases at 2.7V (with 250mV hysteresis), and full functionality - including 3.5µA Burst Mode IQ and PGOOD - is maintained across the entire 2.7V–17V range.
LTC3621IMS8E#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3621IMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IMS8E#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3621IMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621IMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IMS8E#TRPBF?
LTC3621IMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IMS8E#TRPBF 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#TRPBF?
For technical support, including LTC3621IMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC3621IMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IMS8E#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IMS8E#TRPBF?
All LTC3621IMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IMS8E#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621IMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3621IMS8E#TRPBF 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…
