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Analog Devices Inc. LTC3621EDCB#TRPBF
- Part No.:
- LTC3621EDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621EDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,160
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Product details
Overview
LTC3621EDCB#TRPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in a 6-lead DFN (2mm × 3mm) package, featuring 2.25MHz fixed switching frequency, 0.6V to VIN adjustable output, and ultralow 3.5µA quiescent current in shutdown. It delivers high efficiency (>95%) across wide load and input ranges and supports Burst Mode®, pulse-skipping, and forced continuous operation for portable scanners and automotive emergency radios.
For engineers reviewing the LTC3621EDCB#TRPBF datasheet, LTC3621EDCB#TRPBF pinout, LTC3621EDCB#TRPBF application, or LTC3621EDCB#TRPBF equivalent, key selection factors include its 2.25MHz operation enabling compact magnetics, ±1% output voltage accuracy over temperature, AEC-Q100 qualification for automotive use, and MODE/SYNC pin flexibility for ripple-efficiency trade-offs in battery-powered systems.
Technical Context
The LTC3621EDCB#TRPBF implements a constant-frequency peak current mode control architecture with internal compensation and 800µs soft-start. Its 2.25MHz oscillator supports ±40% synchronization range to external clocks, enabling EMI reduction in noise-sensitive environments.
It integrates PMOS top and NMOS bottom power switches with RDS(ON) of 0.37Ω and 0.15Ω respectively, operates from 2.7V to 17V input, regulates down to 0.6V output, and features overtemperature protection, VIN overvoltage lockout (19V), and undervoltage lockout (2.7V).
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 transients. |
| Output Voltage Range | 0.6V to VIN - enables direct regulation from 3.3V/5V rails or low-voltage logic supplies without external LDO post-regulation. |
| Switching Frequency | 2.25MHz (±10% typ.) - allows use of sub-3mm inductors and reduces output capacitor size for space-constrained portable designs. |
| Quiescent Current | 3.5µA in shutdown - extends battery life in always-on emergency radio and handheld scanner standby modes. |
| Output Accuracy | ±1% over –40°C to 125°C - ensures stable microcontroller core voltage under thermal stress in automotive engine compartments. |
| Peak Current Limit | 1.6A (E-grade) - provides robust short-circuit protection while sustaining 1A continuous output at full temperature range. |
| Feedback Reference | 0.6V ±1% - enables precise resistor-divider programming with minimal error contribution to overall VOUT tolerance. |
Pinout & Package
Package: 6-lead DFN (2mm × 3mm), exposed pad (Pin 7) soldered to PCB ground for thermal and electrical performance. Operating junction temperature range: –40°C to 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects directly to inductor; carries high di/dt square wave - requires tight layout and Kelvin connection to minimize EMI and voltage spikes. |
| VIN (Pin 2) | 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; pulls low to disable regulator and reduce system standby current to <100nA. |
| FB (Pin 4) | Feedback sense | Monitors resistor divider output; regulates VOUT to 0.6V reference - high-impedance (10nA bias) for minimal divider current loss. |
| MODE/SYNC (Pin 6) | Operation mode select | Configures Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous (1V–VINTVCC–1.2V); also accepts external clock for EMI control. |
| GND (Exposed Pad) | Power & signal ground | Thermal and electrical return path - must be soldered to large PCB copper area for θJA = 64°C/W and reliable overtemperature protection. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 3.5µA at light loads while maintaining regulation - critical for multi-year battery life in emergency radios. |
| 2.25MHz fixed-frequency switching | Enables use of 2.2µH inductors ≤3mm footprint and 22µF ceramic output capacitors - shrinks total solution size by >40% vs 500kHz alternatives. |
| AEC-Q100 qualified (Grade E) | Validated for automotive applications including infotainment and telematics modules operating at –40°C to 125°C junction temperature. |
| Internal soft-start (800µs) | Prevents inrush current during power-up - eliminates need for external soft-start circuitry in embedded computing power rails. |
| Synchronizable ±40% frequency range | Allows alignment to system clock or adjacent switchers to avoid beat frequencies - simplifies EMI filter design in multi-rail industrial controllers. |
Applications
| Portable Handheld Scanners | Automotive Emergency Radios |
|---|---|
Use Scenario: Battery-powered barcode scanners requiring ultra-low standby current and fast wake-up response. IC Role / Device Role / Timing Role: Primary DC/DC converter supplying 3.3V to MCU and imaging sensor from single Li-ion cell (3.0–4.2V) or 9V alkaline pack. Use Value: 3.5µA shutdown current extends shelf life beyond 5 years; 2.25MHz operation minimizes inductor height for ergonomic handheld form factor. |
Use Scenario: Vehicle-mounted emergency communication radios needing reliable operation during cold cranking (5.5V min) and load dump (up to 17V). IC Role / Device Role / Timing Role: Main 5V/1A power rail for RF transceiver and audio codec in AEC-Q100-compliant module. Use Value: Wide 2.7V–17V input range handles automotive transients without external protection; ±1% VOUT accuracy maintains RF stability across temperature. |
| Industrial Embedded Computing | Low-Power IoT Edge Sensors |
Use Scenario: Fanless industrial PCs and HMIs powered from 12V DC bus with strict thermal limits. IC Role / Device Role / Timing Role: Efficient 1.2V/1A core supply for ARM Cortex-A processor with dynamic voltage scaling support. Use Value: 95% peak efficiency at 1A reduces heat dissipation in sealed enclosures; internal compensation eliminates tuning effort. |
Use Scenario: Wireless sensor nodes harvesting energy from solar or vibration sources with intermittent 2–5V input. IC Role / Device Role / Timing Role: Step-down regulator delivering regulated 3.3V to BLE SoC and analog front-end from variable harvester output. Use Value: Full dropout operation at 100% duty cycle sustains output down to 3.3V input; 0.6V feedback reference enables efficient low-VIN regulation. |
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, 2.5MHz, 3.6µA IQ, but only 0.8V min VOUT and no AEC-Q100 rating. | Not suitable for automotive under-hood use; lacks PGOOD and sync capability. | Select when cost sensitivity outweighs automotive qualification and precise low-VOUT programming. |
| MP2315GJ-Z | 4.5V–28V input, 2MHz, 25µA IQ, 1.2A rating, but ±2% VOUT accuracy and no sync or Burst Mode. | Higher IQ reduces battery runtime; wider VIN suits 24V industrial systems but overshoots portable needs. | Choose for higher input voltage margin where 25µA IQ is acceptable and EMI synchronization is unnecessary. |
Compared with TPS62130ARGTR and MP2315GJ-Z, the LTC3621EDCB#TRPBF offers superior low-IQ performance (3.5µA), tighter output accuracy (±1%), AEC-Q100 compliance, and flexible MODE/SYNC control - making it optimal for space- and battery-constrained automotive and portable applications demanding precision and reliability.
Availability
LTC3621EDCB#TRPBF is available at Aetrix Electronics and suitable for portable handheld scanners, automotive emergency radios, and industrial embedded computing requiring stable component supply, long-lifecycle availability, and AEC-Q100-compliant sourcing.
Supply support for LTC3621EDCB#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 series is part of Analog Devices' Power by Linear™ portfolio, designed specifically for high-efficiency, low-quiescent-current DC/DC conversion in battery-powered and thermally constrained applications.
FAQ
What is the maximum output current capability of the LTC3621EDCB#TRPBF?
The LTC3621EDCB#TRPBF is rated for 1A continuous output current across its full operating temperature range (–40°C to 125°C). Its peak current limit is specified at 1.6A for the E-grade version, providing headroom for transient loads and short-circuit protection while maintaining stable regulation under sustained 1A conditions.
Does the LTC3621EDCB#TRPBF support external frequency synchronization?
Yes, the LTC3621EDCB#TRPBF supports external clock synchronization via the MODE/SYNC pin, with a capture range of ±40% around its nominal 2.25MHz frequency. When an external clock is applied, the device enters forced continuous mode and locks to the external frequency within 2–3 cycles - enabling EMI reduction in dense multi-switcher systems.
What package type and thermal characteristics does the LTC3621EDCB#TRPBF use?
The LTC3621EDCB#TRPBF uses a 6-lead DFN package (2mm × 3mm) with an exposed thermal pad (Pin 7) that must be soldered to PCB ground. Its thermal resistance is θJA = 64°C/W and θJC = 9.6°C/W, enabling reliable operation up to 125°C junction temperature with appropriate board-level copper area.
How does the MODE/SYNC pin configure operating modes on the LTC3621EDCB#TRPBF?
The MODE/SYNC pin configures three distinct modes: tie to INTVCC for Burst Mode® (ultralow IQ), tie to GND for pulse-skipping (lowest ripple), or apply 1V–VINTVCC–1.2V for forced continuous mode (best transient response). It also accepts external clock signals for synchronization - all without external components.
Is the LTC3621EDCB#TRPBF qualified for automotive applications?
Yes, the LTC3621EDCB#TRPBF is AEC-Q100 qualified (Grade E, –40°C to 125°C) and specified for automotive applications including emergency radios and infotainment systems. Its 17V absolute maximum input rating, VIN overvoltage lockout (19V), and robust thermal protection meet stringent automotive reliability requirements.
LTC3621EDCB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN 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:
- 6-DFN (2x3)
LTC3621EDCB#TRPBF FAQ
1.How can I place an order for LTC3621EDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EDCB#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 LTC3621EDCB#TRPBF reliable?
The price and inventory of LTC3621EDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621EDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EDCB#TRPBF?
LTC3621EDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EDCB#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 LTC3621EDCB#TRPBF?
For technical support, including LTC3621EDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EDCB#TRPBF requirements.
6.How does Aetrix verify that LTC3621EDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EDCB#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 LTC3621EDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EDCB#TRPBF?
All LTC3621EDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EDCB#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 LTC3621EDCB#TRPBF part is unused and in its original packaging.
Return procedure for LTC3621EDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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