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Analog Devices Inc. LTC3621EDCB-2#TRMPBF
- Part No.:
- LTC3621EDCB-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621EDCB-2#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,122
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Product details
Overview
LTC3621EDCB-2#TRMPBF from Analog Devices is a 17V, 1A synchronous step-down regulator with 2.25MHz fixed switching frequency, 0.6V to VIN adjustable output, and ultralow 3.5µA quiescent current in shutdown. It operates from 2.7V to 17V input, delivers ±1% output voltage accuracy, and supports Burst Mode®, pulse-skipping, and forced continuous operation-ideal for battery-powered portable scanners and automotive emergency radios requiring high light-load efficiency.
For engineers reviewing the LTC3621EDCB-2#TRMPBF datasheet, LTC3621EDCB-2#TRMPBF pinout, LTC3621EDCB-2#TRMPBF application, or LTC3621EDCB-2#TRMPBF equivalent, key selection criteria include its 2.25MHz operation enabling compact 2.2µH inductors, DFN (2mm × 3mm) thermal performance, MODE/SYNC pin configurability for ripple-efficiency trade-offs, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3621EDCB-2#TRMPBF implements a constant-frequency peak current mode control architecture with internal compensation and 800µs soft-start. Its 2.25MHz oscillator enables fast transient response and small external components while maintaining stable regulation across 2.7V–17V input and 0.6V–VIN output ranges.
It features three selectable operating modes via the MODE/SYNC pin: Burst Mode® (≤3.5µA IQ, 400mA clamp), pulse-skipping (low VOUT ripple), and forced continuous (no subharmonic oscillation). Synchronization to an external clock is supported within ±40% of 2.25MHz, and overtemperature protection activates above 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive supplies without pre-regulation |
| Output Voltage Range | 0.6V to VIN - enables direct 1.8V, 2.5V, 3.3V, or 5V generation from common rails |
| Switching Frequency | 2.25MHz (±10%) - allows use of sub-3mm inductors and reduces EMI fundamental frequency |
| Quiescent Current | 3.5µA in shutdown, ≤1.5mA in Burst Mode - extends battery life in always-on portable systems |
| Output Accuracy | ±1% over temperature and line/load - ensures stable MCU core or sensor supply without calibration |
| Max Output Current | 1A continuous - sufficient for FPGA I/O banks, microcontroller subsystems, or RF front-end biasing |
| Thermal Package | 6-lead DFN (2mm × 3mm) with exposed GND pad - achieves θJA = 64°C/W for high-power density layouts |
Pinout & Package
Package: 6-lead (2mm × 3mm) plastic DFN with exposed thermal pad (Pin 7 = GND), rated for –40°C to 125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt square wave - requires tight layout and low-inductance path to minimize EMI |
| VIN (Pin 2) | Main power input | Accepts 2.7V–17V; feeds internal LDO (INTVCC) and power switches - requires ≥10µF local ceramic bypass |
| RUN (Pin 3) | Enable control | Active-high logic input; pulls regulator out of shutdown - must not float; 20nA leakage enables simple resistor-divider enable |
| FB (Pin 4) | Feedback sense | Monitors resistive divider output; regulates VOUT to 0.6V reference - sets output via R1/R2 per VOUT = 0.6V × (1 + R2/R1) |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Configures Burst Mode® (tie to INTVCC), pulse-skipping (tie to GND), or forced continuous/sync (apply 1V–VINTVCC–1.2V) |
| GND (Exposed Pad) | Power & signal ground | Thermal and electrical return path - must be soldered to large PCB copper area for thermal dissipation and noise control |
Key Features
| Feature | Design Value |
|---|---|
| 2.25MHz fixed-frequency operation | Enables <3mm inductor size and shifts EMI spectrum above sensitive AM radio bands (0.53–1.71MHz) |
| Burst Mode® with 3.5µA IQ | Extends runtime in battery-backed systems by >10× vs continuous mode at µA-level loads |
| Internal soft-start (800µs) | Prevents inrush current and output overshoot during power-up - no external capacitor required |
| ±40% frequency synchronization | Allows EMI reduction via spread-spectrum clock alignment or multi-rail phase interleaving |
| AEC-Q100 qualified (Grade E) | Validated for automotive ambient temperatures (–40°C to +125°C) and vibration/thermal cycling stress |
Applications
| Portable Handheld Scanners | Automotive Emergency Radios |
|---|---|
Use Scenario: Battery-powered barcode scanner with OLED display and CMOS imager requiring regulated 3.3V and 1.8V rails. IC Role / Device Role / Timing Role: Primary DC/DC converter generating 3.3V from single-cell Li-ion (2.7V–4.2V) with dynamic load steps up to 800mA. Use Value: 3.5µA quiescent current preserves standby time; 2.25MHz operation minimizes solution footprint for handheld ergonomics. | Use Scenario: In-vehicle emergency communication radio needing reliable 5V supply from 9V–16V automotive battery under cold-crank (6.5V) and load-dump (30V) transients. IC Role / Device Role / Timing Role: Main 5V buck regulator with VIN OVP (19V trip) and thermal shutdown protecting downstream audio codec and MCU. Use Value: 17V absolute max rating and integrated OVP prevent damage during load dump; AEC-Q100 qualification ensures field reliability. |
| Industrial Embedded Computing | Low-Power IoT Sensor Nodes |
Use Scenario: DIN-rail mounted PLC module with ARM Cortex-M7 processor, Ethernet PHY, and isolated RS-485 interface. IC Role / Device Role / Timing Role: Secondary 1.2V core supply derived from 5V intermediate rail, delivering 1A with <1% load regulation. Use Value: ±1% output accuracy maintains CPU stability across temperature; current-mode control ensures <10µs load transient recovery. | Use Scenario: Wireless environmental sensor node powered by coin cell (CR2032) with BLE SoC, temperature/humidity sensor, and flash memory. IC Role / Device Role / Timing Role: Ultra-low-IQ step-down regulator generating 1.8V from 2.7V–3.0V battery, active only during 10ms measurement bursts. Use Value: 3.5µA shutdown IQ extends 10-year battery life; Burst Mode® eliminates switching losses during 99.9% sleep time. |
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 fixed 3.0V/3.3V/5.0V outputs only - no adjustable version | Not suitable for designs requiring programmable VOUT below 3.0V or >5.0V | Select when fixed-output simplicity outweighs adjustability need and 3.3V/5V matches system rails |
| MAX17504ATP+T | 4.5V–60V input, 2.2MHz, 1.2A, but 12µA IQ and no Burst Mode - higher light-load power loss | Targeted at high-VIN industrial power supplies, not battery or automotive low-VIN use cases | Choose only if input exceeds 17V or if higher voltage tolerance is mandatory; avoid for sub-17V battery systems |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3621EDCB-2#TRMPBF uniquely combines 2.7V–17V input range, 2.25MHz operation, fully adjustable output, and 3.5µA IQ - making it optimal for space-constrained, battery-sensitive applications where flexibility and efficiency are co-prioritized.
Availability
LTC3621EDCB-2#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 AEC-Q100-compliant performance.
Supply support for LTC3621EDCB-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, communications, and automotive markets.
The LTC3621 product line delivers high-efficiency, ultralow-IQ synchronous buck regulators optimized for battery-powered and automotive applications demanding compact size, wide input range, and robust thermal performance.
FAQ
What is the switching frequency of the LTC3621EDCB-2#TRMPBF and how is it set?
The LTC3621EDCB-2#TRMPBF has a factory-set fixed switching frequency of 2.25MHz, confirmed in the Electrical Characteristics table (fOSC = 2.25MHz for E/I-grade). This frequency is not user-adjustable via external components but can be synchronized to an external clock within ±40% (1.35MHz–3.15MHz) using the MODE/SYNC pin. The 2.25MHz value enables small inductor and capacitor footprints while maintaining high efficiency across load conditions.
Does the LTC3621EDCB-2#TRMPBF support adjustable output voltage, and what is the minimum achievable VOUT?
Yes, the LTC3621EDCB-2#TRMPBF supports fully adjustable output voltage from 0.6V to VIN using an external resistor divider on the FB pin. The minimum regulated output is 0.6V - the internal reference voltage - which is guaranteed over temperature and line/load per the Electrical Characteristics table (VFB = 0.594V to 0.606V). This allows generation of 0.8V, 1.2V, or 1.8V rails for modern low-voltage processors and sensors.
What are the operating modes controlled by the MODE/SYNC pin on the LTC3621EDCB-2#TRMPBF?
The MODE/SYNC pin on the LTC3621EDCB-2#TRMPBF selects among three distinct operating modes: Burst Mode® (tie to INTVCC for ≤3.5µA IQ), pulse-skipping (tie to GND for lowest output ripple), and forced continuous mode (apply 1.0V–VINTVCC–1.2V for fixed-frequency operation at all loads). These modes are explicitly defined in the Pin Functions and Operation sections of the datasheet, enabling precise optimization of efficiency versus noise for each application.
Is the LTC3621EDCB-2#TRMPBF qualified for automotive applications, and what grade does it carry?
Yes, the LTC3621EDCB-2#TRMPBF is AEC-Q100 qualified for automotive applications. As indicated in the Order Information table, the "E" grade (LTC3621E) specifies an operating junction temperature range of –40°C to +125°C and is explicitly listed under Automotive Products with #WPBF suffix variants. While the standard LTC3621EDCB-2#TRMPBF uses the same die and package, its qualification status derives from the E-grade process and test flow validated for automotive reliability requirements.
What is the thermal resistance and maximum junction temperature of the LTC3621EDCB-2#TRMPBF in its DFN package?
The LTC3621EDCB-2#TRMPBF in the 6-lead DFN (2mm × 3mm) package has θJA = 64°C/W and θJC = 9.6°C/W, with a maximum junction temperature (TJMAX) of 125°C. These values are specified in the Absolute Maximum Ratings section and confirmed in the DFN Package description. Proper soldering of the exposed GND pad to a thermal plane is mandatory to achieve these ratings and sustain 1A continuous output under worst-case ambient conditions.
LTC3621EDCB-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)
LTC3621EDCB-2#TRMPBF FAQ
1.How can I place an order for LTC3621EDCB-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EDCB-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 LTC3621EDCB-2#TRMPBF reliable?
The price and inventory of LTC3621EDCB-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 LTC3621EDCB-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EDCB-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EDCB-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EDCB-2#TRMPBF?
LTC3621EDCB-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EDCB-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 LTC3621EDCB-2#TRMPBF?
For technical support, including LTC3621EDCB-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EDCB-2#TRMPBF requirements.
6.How does Aetrix verify that LTC3621EDCB-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EDCB-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 LTC3621EDCB-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EDCB-2#TRMPBF?
All LTC3621EDCB-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EDCB-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 LTC3621EDCB-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621EDCB-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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