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Analog Devices Inc. LTC3621IDCB-2#TRMPBF
- Part No.:
- LTC3621IDCB-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621IDCB-2#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,108
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Product details
Overview
LTC3621IDCB-2#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, 3.5µA quiescent current, and adjustable 0.6V–VIN output voltage - deployed in portable handheld scanners and automotive emergency radios requiring ultra-low IQ and high-frequency power conversion.
For engineers reviewing the LTC3621IDCB-2#TRMPBF datasheet, LTC3621IDCB-2#TRMPBF pinout, LTC3621IDCB-2#TRMPBF application, or LTC3621IDCB-2#TRMPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed efficiency vs. load curves at 2.25MHz, exact thermal resistance values (θJA = 64°C/W), and real-world mode-selection trade-offs between Burst Mode and pulse-skipping operation.
Technical Context
The LTC3621IDCB-2#TRMPBF uses constant-frequency peak current mode control with internal compensation and an 800µs soft-start ramp. Its MODE/SYNC pin supports three operational modes: Burst Mode (MODE/SYNC = INTVCC, 400mA clamp), pulse-skipping (MODE/SYNC = GND, ~66mA clamp), and forced continuous mode (MODE/SYNC = 1V to VINTVCC – 1.2V).
It features integrated PMOS/NMOS synchronous switches with RDS(ON) of 0.37Ω (top) and 0.15Ω (bottom) at VIN = 5V, ±1% feedback reference accuracy (0.594V–0.606V), and full dropout operation down to 100% duty cycle while maintaining 3.5µA shutdown current and 1.6A peak current limit (I-grade).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery rails without external pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables direct regulation from 12V input to sub-1V core supplies via external resistor divider. |
| Switching Frequency | 2.25MHz (±40% sync range) - allows compact 2.2µH inductors and reduces EMI filtering burden in space-constrained designs. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on emergency radios and portable scanners during standby. |
| Output Accuracy | ±1% over temperature - ensures stable 3.3V/5V rail generation for MCU peripherals and sensors without calibration. |
| Peak Current Limit | 1.6A (I-grade) - provides robust short-circuit protection while sustaining 1A continuous output under full thermal derating. |
| Thermal Resistance | θJA = 64°C/W (DFN package) - enables 1A operation at TA ≤ 85°C with minimal PCB copper area. |
Pinout & Package
Package: 6-Lead (2mm × 3mm) Plastic DFN with exposed pad (Pin 7) soldered to PCB ground for thermal and electrical integrity. 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 current - requires tight layout and low-inductance path to minimize EMI. |
| VIN (Pin 2) | Input Supply | Accepts 2.7V–17V input; powers internal LDO (INTVCC) and gate drivers - bypass with ≥10µF ceramic capacitor close to pin. |
| RUN (Pin 3) | Enable Control | Active-high logic input; pulling low disables regulator and reduces IQ to 0.1µA - must not be left floating. |
| FB (Pin 4) | Feedback Input | Senses divided output voltage; sets VOUT = 0.6V × (1 + R2/R1); input bias current <10nA minimizes divider error. |
| MODE/SYNC (Pin 6) | Mode Selection / Clock Sync | Selects Burst Mode (INTVCC), pulse-skipping (GND), or forced continuous (1V–VINTVCC–1.2V); accepts external clock up to ±40% of 2.25MHz. |
| GND (Exposed Pad) | Power & Signal Ground | Primary thermal path and return for high-current loops - must be solidly soldered to large PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for battery-powered emergency radios with intermittent transmit duty cycles. |
| 2.25MHz Fixed Switching | Enables use of small 2.2µH inductors and 22µF ceramic output capacitors - cuts solution size by >40% vs. 1MHz alternatives. |
| Internal Compensation | Eliminates external compensation network - simplifies design validation and reduces BOM count for industrial embedded computing power rails. |
| Full Dropout Support | Maintains regulation down to VIN = VOUT with 100% duty cycle and active current limiting - essential for automotive cold-crank scenarios (VIN dips to 4.5V). |
| AEC-Q100 Qualified Options | I-grade DFN variant meets AEC-Q100 Grade I (–40°C to 125°C) requirements - qualified for non-safety-critical automotive subsystems. |
Applications
| Portable Handheld Scanners | Automotive Emergency Radios |
|---|---|
Use Scenario: Battery-powered barcode scanner with intermittent 500ms active scanning bursts and 30s idle intervals. IC Role / Device Role / Timing Role: Primary 3.3V/1A power supply for CMOS image sensor and ARM Cortex-M4 MCU. Use Value: 3.5µA quiescent current extends 2000mAh Li-ion battery life from 72h to >14 days in standby; 2.25MHz operation avoids AM radio band interference. |
Use Scenario: In-vehicle emergency communication unit requiring reliable 5V/1A rail during cold-crank (VIN = 4.5V–16V). IC Role / Device Role / Timing Role: Main DC-DC converter powering RF transceiver and audio codec under wide-input transient conditions. Use Value: Full dropout operation maintains 5V output at VIN = 5.0V; ±1% VOUT accuracy ensures clean ADC reference for voice digitization. |
| Industrial Embedded Computing | Low-Power IoT Edge Nodes |
Use Scenario: DIN-rail mounted PLC controller with isolated 24V input and dual 3.3V/5V outputs for FPGA and Ethernet PHY. IC Role / Device Role / Timing Role: Secondary 3.3V point-of-load regulator downstream of isolated 24V-to-12V stage. Use Value: Internal compensation eliminates tuning effort; 64°C/W θJA enables convection-only cooling in sealed enclosures. |
Use Scenario: Wireless sensor node powered by coin cell (3V) or energy harvester, requiring regulated 1.8V for ultra-low-power MCU. IC Role / Device Role / Timing Role: Adjustable-output buck converting 3V input to 1.8V at 100mA peak, optimized for intermittent wake-up cycles. Use Value: 0.6V feedback reference enables precise 1.8V setting with standard 1% resistors; 3.5µA IQ maximizes harvestable energy utilization. |
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 fixed frequency, 2.5µA IQ, but only 0.8V–6V adjustable output - no 0.6V reference. | Lacks full 0.6V–VIN range; unsuitable for sub-1V core supplies or wide-VOUT programmability. | Choose when higher switching frequency (3MHz) and lower IQ are prioritized over output flexibility. |
| MAX17504ATP+T | 4.5V–60V input, 2.2MHz, 1.2A, but 12µA IQ and no Burst Mode - uses pulse-frequency modulation instead. | Higher IQ and no ultralow-power sleep mode; designed for high-input industrial, not battery-sensitive apps. | Prefer for 24V/48V systems where input exceeds 17V and efficiency at medium loads outweighs standby IQ. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3621IDCB-2#TRMPBF uniquely combines 2.25MHz operation, 0.6V–VIN adjustability, and 3.5µA Burst Mode IQ - making it optimal for space- and battery-constrained applications needing maximum design flexibility within the 17V input limit.
Availability
LTC3621IDCB-2#TRMPBF is available at Aetrix Electronics and suitable for portable handheld scanners, automotive emergency radios, and industrial embedded computing requiring stable component supply, AEC-Q100-compliant variants, and long-term production continuity.
Supply support for LTC3621IDCB-2#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 automation, and automotive markets since 1965.
The LTC3621IDCB-2#TRMPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency monolithic DC-DC regulators, engineered specifically for battery-powered and thermally constrained applications demanding ultralow IQ and high-frequency operation.
FAQ
What is the switching frequency of the LTC3621IDCB-2#TRMPBF and can it be synchronized?
The LTC3621IDCB-2#TRMPBF operates at a fixed 2.25MHz switching frequency with a ±40% synchronization range. Its MODE/SYNC pin accepts an external clock signal to lock the internal oscillator - enabling EMI reduction in noise-sensitive systems like automotive radios. The part enters forced continuous mode during sync, and lock acquisition takes 2–3 external clock cycles.
How does the LTC3621IDCB-2#TRMPBF achieve 3.5µA quiescent current?
The LTC3621IDCB-2#TRMPBF achieves 3.5µA quiescent current in Burst Mode® operation by disabling both power switches during light-load periods and entering a deep sleep state where only essential bias circuitry remains active. This occurs when the MODE/SYNC pin is tied to INTVCC, clamping peak inductor current to ≥400mA and allowing the FB voltage to rise until the error amplifier output (ITH) drops below 0.2V - triggering sleep mode.
What package type and thermal performance does the LTC3621IDCB-2#TRMPBF use?
The LTC3621IDCB-2#TRMPBF uses a 6-lead (2mm × 3mm) plastic DFN package with an exposed thermal pad (Pin 7) that must be soldered to the PCB ground plane. Its thermal resistance is θJA = 64°C/W and θJC = 9.6°C/W, enabling 1A continuous output at ambient temperatures up to 85°C with minimal copper area - verified per the manufacturer's Rev. D datasheet absolute maximum ratings and thermal characterization.
Can the LTC3621IDCB-2#TRMPBF operate in dropout, and what happens to regulation?
Yes, the LTC3621IDCB-2#TRMPBF supports full dropout operation down to 100% duty cycle when VIN approaches VOUT. In forced continuous mode, the top PMOS switch remains fully on while maintaining regulation; in Burst Mode or pulse-skipping, it transitions in/out of sleep to sustain output voltage with ultralow IQ. Peak current limit remains stable at 1.6A (I-grade) even at high duty cycles due to internal slope compensation.
What are the key differences between the LTC3621IDCB-2#TRMPBF and the LTC3621IDCB#TRMPBF?
The LTC3621IDCB-2#TRMPBF operates at 2.25MHz with ±40% sync range, while the LTC3621IDCB#TRMPBF runs at 1.00MHz. Both share identical 2.7V–17V input range, 0.6V–VIN output adjustability, 3.5µA IQ, and DFN packaging. The higher frequency of the LTC3621IDCB-2#TRMPBF enables smaller magnetics and reduced output capacitance - critical for space-constrained portable designs.
LTC3621IDCB-2#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:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LTC3621IDCB-2#TRMPBF FAQ
1.How can I place an order for LTC3621IDCB-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IDCB-2#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 LTC3621IDCB-2#TRMPBF reliable?
The price and inventory of LTC3621IDCB-2#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3621IDCB-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IDCB-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IDCB-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IDCB-2#TRMPBF?
LTC3621IDCB-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IDCB-2#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 LTC3621IDCB-2#TRMPBF?
For technical support, including LTC3621IDCB-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IDCB-2#TRMPBF requirements.
6.How does Aetrix verify that LTC3621IDCB-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IDCB-2#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 LTC3621IDCB-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IDCB-2#TRMPBF?
All LTC3621IDCB-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IDCB-2#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 LTC3621IDCB-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621IDCB-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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