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Analog Devices Inc. LTC3621EMS8E#TRPBF
- Part No.:
- LTC3621EMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3621EMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,205
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Product details
Overview
LTC3621EMS8E#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in thermally enhanced MSOP-8 (MS8E) package with independent SGND and PGOOD output. It operates from 2.7V to 17V input, delivers adjustable 0.6V–VIN output, features 2.25MHz fixed switching frequency, ±1% output voltage accuracy, and ultralow 3.5µA quiescent current in shutdown - ideal for battery-powered industrial sensors and automotive infotainment power rails.
For engineers reviewing the LTC3621EMS8E#TRPBF datasheet, LTC3621EMS8E#TRPBF pinout, LTC3621EMS8E#TRPBF application, or LTC3621EMS8E#TRPBF equivalent, key selection criteria include its 2.25MHz operation enabling compact 2.2µH inductors, Burst Mode® efficiency at light loads, PGOOD monitoring capability, and AEC-Q100 qualification for automotive use cases requiring high reliability under thermal stress.
Technical Context
The LTC3621EMS8E#TRPBF 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 the MODE/SYNC pin, enabling EMI reduction in noise-sensitive systems.
It integrates dual MOSFETs (top PMOS RDS(ON) = 0.37Ω, bottom NMOS RDS(ON) = 0.15Ω at VIN = 5V), overtemperature protection, VIN overvoltage lockout (19V trip), and undervoltage lockout (2.7V). The MS8E package includes dedicated SGND and exposed pad GND for optimal thermal and signal integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery rails including 12V nominal systems with cold-crank tolerance. |
| Output Voltage Range | 0.6V to VIN - enables precise regulation down to core logic voltages (e.g., 0.9V, 1.2V, 1.8V) using external resistor divider. |
| Switching Frequency | 2.25MHz (±10% typical) - allows use of sub-3mm × 3mm inductors and reduces output capacitor size vs lower-frequency alternatives. |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on sensor nodes and emergency radio standby modes. |
| Output Accuracy | ±1% over temperature and line/load - ensures stable MCU core voltage without post-regulation trimming. |
| Peak Current Limit | 1.6A (E-grade) - provides robust short-circuit protection while sustaining 1A continuous output with margin. |
| PGOOD Threshold | ±7.5% of VOUT - enables reliable power sequencing and fault detection in multi-rail systems. |
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 to inductor; carries high di/dt square wave - requires tight layout and low-inductance routing. |
| VIN (Pin 2) | Main input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers; bypass with ≥10µF ceramic close to pin. |
| RUN (Pin 3) | Enable control | Active-high logic input; <0.3V disables regulator; >1.0V enables - supports system-level power sequencing. |
| FB (Pin 5) | Feedback reference | Senses divided output voltage; internal 0.6V reference sets VOUT = 0.6V × (1 + R2/R1). |
| INTVCC (Pin 6) | Internal LDO output | 3.6V regulated supply for internal circuitry; must be bypassed with ≥1µF ceramic to GND. |
| MODE/SYNC (Pin 7) | Operating mode select | Tied to INTVCC = Burst Mode®; GND = pulse-skipping; 1V–VINTVCC–1.2V = forced continuous; external clock sync enabled. |
| PGOOD (Pin 4) | Power good indicator | Open-drain output pulled high when VOUT is within ±7.5%; 32-cycle blanking prevents transient false trips. |
| SGND (Pin 8) | Signal ground | Dedicated low-noise ground return for FB, MODE/SYNC, and PGOOD - separate from power GND (exposed pad) to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 3.5µA at light loads while maintaining regulation - critical for >1-year battery life in IoT edge sensors. |
| 2.25MHz fixed-frequency switching | Enables use of tiny 2.2µH shielded inductors and low-ESR ceramic capacitors - cuts solution size by >40% vs 500kHz regulators. |
| Independent SGND pin | Isolates sensitive analog feedback path from noisy power ground - improves load/line transient response and output voltage stability. |
| PGOOD with 32-cycle blanking | Prevents false power-fail assertions during dynamic load steps or input transients - ensures reliable system reset and sequencing. |
| AEC-Q100 qualified (Grade 1) | Validated for automotive applications including infotainment, ADAS camera modules, and body control units operating at –40°C to +125°C. |
Applications
| Portable-Handheld Scanners | Automotive Infotainment |
|---|---|
Use Scenario: Powering CMOS image sensor and ARM Cortex-M4 microcontroller in handheld barcode scanners with single-cell Li-ion (3.0–4.2V) input. IC Role / Device Role / Timing Role: Primary buck converter delivering 1.2V core and 3.3V I/O rails with fast transient response to burst-mode imaging loads. Use Value: 3.5µA shutdown IQ extends battery runtime beyond 12 months in sleep mode; 2.25MHz operation minimizes PCB area for compact handheld form factor. |
Use Scenario: Supplying 1.8V DDR memory and 3.3V USB PHY in automotive head unit with 9–16V battery input and load dump transients. IC Role / Device Role / Timing Role: Secondary point-of-load regulator after main 5V DC/DC, providing clean, sequenced, and monitored low-voltage rails. Use Value: PGOOD output enables safe power-up sequencing; AEC-Q100 qualification ensures reliability across temperature cycling and vibration profiles. |
| Industrial Sensor Nodes | Emergency Radio Systems |
Use Scenario: Regulating 3.3V for LoRaWAN transceiver and ultra-low-power MCU in battery-operated wireless temperature/humidity sensors deployed in remote locations. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with programmable light-load mode to maximize energy harvesting or coin-cell lifetime. Use Value: Burst Mode® achieves >85% efficiency at 100µA load; ±1% output accuracy maintains RF front-end performance across temperature. |
Use Scenario: Providing stable 5V rail for audio amplifier and microcontroller in hand-crank or solar-charged emergency radios with variable input (4–12V). IC Role / Device Role / Timing Role: Main power converter supporting dropout operation down to VIN = VOUT + 0.3V while maintaining regulation. Use Value: Full-dropout capability extends usable battery range; 17V absolute max rating withstands cranking spikes up to 16V. |
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 | 3.6V–17V input, 3MHz switching, 1.2A output, no PGOOD or SGND separation, 17µA IQ in LP mode | Lacks dedicated PGOOD and isolated SGND; less suitable for automotive safety-critical sequencing or noise-sensitive analog supplies | Preferred for cost-sensitive consumer applications where board space is constrained but PGOOD and ground isolation are not required. |
| MAX17504ATJ+T | 4.5V–60V input, 2.2MHz, 1A, integrated FETs, ±1.5% VOUT accuracy, no Burst Mode®, 25µA IQ | Higher input voltage range but higher minimum input (4.5V); no ultralow-IQ mode - unsuitable for sub-3V battery operation | Selected when input exceeds 17V (e.g., 24V industrial bus) and 3.5µA shutdown IQ is not mandatory. |
Compared with TPS62130ARGTR and MAX17504ATJ+T, the LTC3621EMS8E#TRPBF uniquely combines AEC-Q100 qualification, dedicated SGND, PGOOD with blanking, and 3.5µA shutdown IQ - making it the only option among the three qualified for automotive infotainment and battery-constrained industrial sensing.
Availability
LTC3621EMS8E#TRPBF is available at Aetrix Electronics and suitable for portable-handheld scanners, automotive infotainment systems, and industrial sensor nodes requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3621EMS8E#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 precision instrumentation, industrial automation, and automotive markets.
The LTC3621EMS8E#TRPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency DC/DC regulators, designed specifically for space-constrained, battery-sensitive, and automotive-grade applications demanding ultralow quiescent current and robust thermal performance.
FAQ
What is the maximum input voltage rating for the LTC3621EMS8E#TRPBF?
The LTC3621EMS8E#TRPBF has an absolute maximum input voltage rating of 17V. Exceeding this value risks permanent damage. Its VIN overvoltage lockout activates at 19V (rising) with 300mV hysteresis, suspending switching until VIN drops below 18.7V - protecting internal MOSFETs during load-dump transients common in automotive 12V systems.
Does the LTC3621EMS8E#TRPBF support external frequency synchronization?
Yes, the LTC3621EMS8E#TRPBF supports external synchronization via the MODE/SYNC pin. It locks to an external clock within ±40% of its nominal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz), entering forced continuous mode upon sync engagement - useful for reducing beat frequencies and EMI in multi-converter systems.
How does the PGOOD function work on the LTC3621EMS8E#TRPBF?
The LTC3621EMS8E#TRPBF's PGOOD pin is an open-drain output that goes high when VOUT is within ±7.5% of its target value. It includes a 32-switching-cycle blanking delay on the falling edge to prevent false trips during load transients. An external pull-up resistor is required to set the logic-high level.
What is the purpose of the SGND pin on the LTC3621EMS8E#TRPBF?
The SGND (Signal Ground) pin on the LTC3621EMS8E#TRPBF provides a dedicated low-noise ground return path for the FB, MODE/SYNC, and PGOOD pins - electrically isolated from the high-current power ground (exposed pad). This separation minimizes noise coupling into the feedback loop, improving output voltage accuracy and transient response.
Can the LTC3621EMS8E#TRPBF operate in dropout mode, and what happens to efficiency?
Yes, the LTC3621EMS8E#TRPBF supports full dropout operation down to VIN = VOUT + 0.3V. In forced continuous mode, the top PMOS remains fully on; in Burst Mode®, it cycles between active regulation and sleep to maintain ultralow 3.5µA quiescent current - extending usable battery life even near end-of-discharge.
LTC3621EMS8E#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
LTC3621EMS8E#TRPBF FAQ
1.How can I place an order for LTC3621EMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EMS8E#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 LTC3621EMS8E#TRPBF reliable?
The price and inventory of LTC3621EMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621EMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EMS8E#TRPBF?
LTC3621EMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EMS8E#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 LTC3621EMS8E#TRPBF?
For technical support, including LTC3621EMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EMS8E#TRPBF requirements.
6.How does Aetrix verify that LTC3621EMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EMS8E#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 LTC3621EMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EMS8E#TRPBF?
All LTC3621EMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EMS8E#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 LTC3621EMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621EMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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