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Analog Devices Inc. LTC3621EDCB#TRMPBF
- Part No.:
- LTC3621EDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621EDCB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,879
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Product details
Overview
LTC3621EDCB#TRMPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in a 6-lead DFN (2mm × 3mm) package, operating at a fixed 2.25MHz switching frequency with ±40% sync range. It delivers adjustable output from 0.6V to VIN, achieves up to 95% efficiency, maintains ±1% output voltage accuracy, and draws only 3.5µA quiescent current in Burst Mode-ideal for battery-powered portable scanners and automotive emergency radios.
For engineers reviewing the LTC3621EDCB#TRMPBF datasheet, LTC3621EDCB#TRMPBF pinout, LTC3621EDCB#TRMPBF application, or LTC3621EDCB#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (Burst/Pulse-Skipping/Forced Continuous), exact thermal specs (θJA = 64°C/W), and real-world application constraints including dropout behavior and PGOOD timing.
Technical Context
The LTC3621EDCB#TRMPBF implements a constant-frequency peak current mode control architecture with internal compensation and 800µs soft-start. Its 2.25MHz fixed oscillator supports external synchronization within ±40%, enabling EMI-sensitive designs to align switching noise away from critical bands.
It integrates dual MOSFETs (PMOS top switch, NMOS bottom switch), features ultralow IQ shutdown (<0.1µA), and includes overtemperature protection plus VIN overvoltage lockout (19V rising, 18.7V falling). The MODE/SYNC pin selects operation mode and enables clock sync without requiring external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive supplies, including 12V nominal systems with transients. |
| Output Voltage Range | 0.6V to VIN - enables direct regulation from input down to sub-1V logic rails using external resistor divider. |
| Switching Frequency | 2.25MHz (±40% sync range) - allows compact 2.2µH inductors and reduces EMI fundamental below 3.2MHz. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on portable devices such as handheld scanners. |
| Output Accuracy | ±1% over temperature - ensures stable reference for precision analog or MCU power domains. |
| Peak Current Limit | 1.6A (E-grade) - provides robust short-circuit protection while sustaining 1A continuous load at full temperature range. |
| Thermal Resistance | θJA = 64°C/W - requires minimal PCB copper area for thermal management in space-constrained DFN layouts. |
Pinout & Package
Package: 6-lead (2mm × 3mm) plastic DFN with exposed GND pad (Pin 7), rated for –40°C to 125°C junction temperature.
| 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 low-inductance path to minimize EMI. |
| VIN (Pin 2) | Input supply | Accepts 2.7V–17V; powers internal LDO (INTVCC) and gate drivers-must be bypassed with ≥10µF ceramic capacitor. |
| RUN (Pin 3) | Enable control | Active-high logic input; pulling low disables regulator and reduces IQ to <0.1µA-no external pull-up required. |
| FB (Pin 4) | Feedback input | Senses 0.6V reference; sets VOUT via R1/R2 divider-accuracy depends on resistor tolerance and layout noise immunity. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to INTVCC for Burst Mode (low IQ), GND for Pulse-Skipping (low ripple), or external clock for forced continuous sync. |
| GND (Exposed Pad) | Power & signal ground | Mandatory solder connection to PCB ground plane-critical for thermal performance and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces IQ to 3.5µA at light loads while maintaining regulation-enables multi-year battery life in standby applications. |
| 2.25MHz fixed-frequency switching | Enables use of small 2.2µH inductors and 22µF ceramic output capacitors-reduces solution size by >40% vs 500kHz alternatives. |
| Internal compensation | Eliminates external compensation network-simplifies design, reduces BOM count, and guarantees stability across all VOUT settings. |
| Full dropout operation | Maintains regulation down to VIN ≈ VOUT with PMOS top switch fully enhanced-supports brownout resilience in automotive systems. |
| Overvoltage lockout (19V) | Protects internal FETs during load dump events-resumes operation automatically at 18.7V without latch-off or manual reset. |
Applications
| Portable-Handheld Scanners | Automotive Emergency Radio |
|---|---|
|
Use Scenario: Battery-powered barcode scanner with intermittent active periods and long idle intervals. IC Role / Device Role / Timing Role: Primary DC/DC converter supplying 3.3V to microcontroller and imaging sensor. Use Value: 3.5µA quiescent current in Burst Mode extends single-cell Li-ion battery life beyond 6 months in standby. |
Use Scenario: Compact AM/FM emergency radio powered from vehicle 12V system with cold-crank capability. IC Role / Device Role / Timing Role: Point-of-load regulator delivering 5V to audio amplifier and digital tuner IC. Use Value: 2.7V minimum VIN and full dropout operation ensure uninterrupted function during engine cranking (down to 6V). |
| Industrial Embedded Computing | Emergency Lighting Control |
|
Use Scenario: Fanless edge controller in factory automation with strict thermal and EMI limits. IC Role / Device Role / Timing Role: High-efficiency 1.2V core supply for ARM Cortex-M7 processor. Use Value: 2.25MHz switching shifts noise spectrum above sensitive 2.4GHz wireless bands-reducing RF interference. |
Use Scenario: LED driver board in emergency exit sign with backup supercapacitor energy storage. IC Role / Device Role / Timing Role: Step-down regulator converting supercapacitor voltage (up to 15V) to 3.3V for MCU and sensors. Use Value: 17V absolute max VIN rating and 1.6A current limit safely handle supercapacitor charge/discharge transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.0V–17V input, 2.25MHz, 3.6µA IQ, but fixed 3.3V/5V outputs only-no adjustable version at same frequency. | Lacks adjustable VOUT and external sync capability-unsuitable where programmable rail or EMI coordination is required. | Choose only if fixed 3.3V/5V output suffices and no external clock sync is needed. |
| MAX17504ATP+T | 4.5V–60V input, 1.2MHz, 1.2mA IQ-higher voltage range but 340× higher light-load IQ than LTC3621EDCB#TRMPBF. | Designed for industrial HV inputs-not optimized for battery or automotive 12V systems with low-IQ demands. | Select only when input exceeds 17V; avoid for portable or automotive applications requiring µA-level standby current. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3621EDCB#TRMPBF uniquely combines 2.25MHz operation, 3.5µA IQ, adjustable VOUT, and external sync in a 2mm × 3mm DFN-making it the only option meeting all four requirements simultaneously for space- and power-constrained designs.
Availability
LTC3621EDCB#TRMPBF is available at Aetrix Electronics and suitable for portable-handheld scanners, automotive emergency radios, and industrial embedded computing requiring stable component supply, long-term lifecycle support, and guaranteed AEC-Q100-compliant variants.
Supply support for LTC3621EDCB#TRMPBF 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, automotive, and communications markets.
The LTC3621 series was designed specifically for ultra-low-power, high-density DC/DC conversion in battery-operated and automotive systems-emphasizing quiescent current optimization, small-footprint integration, and robust transient response.
FAQ
What is the maximum input voltage rating for the LTC3621EDCB#TRMPBF?
The LTC3621EDCB#TRMPBF has an absolute maximum input voltage rating of 17V. Exceeding this value risks permanent damage. Its VIN overvoltage lockout activates at 19V (rising) and releases at 18.7V, providing transient protection during load-dump events common in automotive 12V systems. This ensures safe operation even with brief spikes up to 19V.
Does the LTC3621EDCB#TRMPBF support adjustable output voltage?
Yes, the LTC3621EDCB#TRMPBF supports fully adjustable output voltage from 0.6V to VIN using an external resistor divider connected to the FB pin. The output is set by VOUT = 0.6V × (1 + R2/R1), with ±1% feedback reference accuracy ensuring precise regulation across temperature and load conditions.
What are the operating modes controlled by the MODE/SYNC pin on the LTC3621EDCB#TRMPBF?
The MODE/SYNC pin on the LTC3621EDCB#TRMPBF selects three distinct operating modes: tie to INTVCC for Burst Mode (3.5µA IQ), ground for Pulse-Skipping (lowest output ripple), or apply 1V–VINTVCC–1.2V for Forced Continuous Mode. It also accepts external clock signals for synchronization within ±40% of 2.25MHz-enabling deterministic EMI management.
Is the LTC3621EDCB#TRMPBF qualified for automotive applications?
The LTC3621EDCB#TRMPBF itself is not AEC-Q100 qualified; however, the LTC3621EMS8E-2#WPBF and LTC3621IMS8E-2#WPBF variants are automotive-grade versions with controlled manufacturing and full AEC-Q100 qualification. The DFN-packaged LTC3621EDCB#TRMPBF is rated for –40°C to 125°C junction temperature and used in non-automotive industrial and portable applications.
What is the thermal resistance (θJA) of the LTC3621EDCB#TRMPBF in its DFN package?
The LTC3621EDCB#TRMPBF in the 6-lead (2mm × 3mm) DFN package has a specified θJA of 64°C/W under standard JEDEC 2-layer board conditions. This value assumes proper soldering of the exposed GND pad to a thermal plane-failure to do so degrades thermal performance significantly and may trigger overtemperature shutdown.
LTC3621EDCB#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC3621EDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EDCB#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC3621EDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621EDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EDCB#TRMPBF?
LTC3621EDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EDCB#TRMPBF 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#TRMPBF?
For technical support, including LTC3621EDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EDCB#TRMPBF requirements.
6.How does Aetrix verify that LTC3621EDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EDCB#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EDCB#TRMPBF?
All LTC3621EDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EDCB#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621EDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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