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Analog Devices Inc. LTC3621EDCB-5#TRMPBF
- Part No.:
- LTC3621EDCB-5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621EDCB-5#TRMPBF.pdf
- Description:
- IC REG BUCK 5V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3621EDCB-5#TRMPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in a 6-lead DFN (2mm × 3mm) package, operating at fixed 1MHz switching frequency with 5V fixed output, ±1% output voltage accuracy, and ultralow 3.5µA quiescent current - deployed in automotive emergency radios requiring stable low-power 5V rail generation.
For engineers reviewing the LTC3621EDCB-5#TRMPBF datasheet, LTC3621EDCB-5#TRMPBF pinout, LTC3621EDCB-5#TRMPBF application, or LTC3621EDCB-5#TRMPBF equivalent, key selection considerations include its fixed 5V output, 1MHz constant-frequency operation, Burst Mode®/pulse-skipping mode flexibility, thermal performance in DFN package, and AEC-Q100-compatibility for automotive-grade reliability.
Technical Context
The LTC3621EDCB-5#TRMPBF implements a peak current-mode control architecture with internal compensation, enabling fast line and load transient response. Its 1MHz fixed-frequency oscillator supports external synchronization within ±40%, and the MODE/SYNC pin configures operation between Burst Mode (3.5µA IQ), pulse-skipping (low ripple), or forced continuous mode.
It integrates both PMOS high-side and NMOS low-side power switches with RDS(ON) of 0.37Ω and 0.15Ω respectively, operates across 2.7V–17V input range, delivers up to 1A output, and features overtemperature protection plus VIN overvoltage lockout at 19V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% - eliminates external feedback divider, simplifies layout and improves stability. |
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery-supplied systems including cold-crank scenarios. |
| Switching Frequency | 1.00MHz (±8%) - enables compact magnetics and EMI filtering; synchronizable to external clock ±40%. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on emergency radio and portable scanner applications. |
| Max Output Current | 1.0A continuous - sufficient for powering microcontrollers, sensors, and RF transceivers from single 5V rail. |
| Thermal Performance | θJA = 64°C/W (DCB package) - requires minimal PCB copper area for thermal management in space-constrained designs. |
| Protection Features | Overtemperature shutdown, VIN overvoltage lockout (19V), undervoltage lockout (2.7V) - ensures robust operation under fault conditions. |
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 to inductor; carries high di/dt switching current - requires short, low-inductance trace routing. |
| VIN (Pin 2) | Input supply | Accepts 2.7V–17V; must be bypassed with ≥10µF ceramic capacitor close to pin for EMI suppression. |
| RUN (Pin 3) | Enable control | Active-high logic input; pull high to enable regulation, tie low to shut down with <0.1µA standby current. |
| FB (Pin 4) | Feedback reference | Internally connected to 5V output - no external resistor divider required for fixed-output configuration. |
| INTVCC (Pin 5) | Bias LDO output | 3.6V internal LDO; bypass with ≥1µF ceramic capacitor to GND for gate drive stability. |
| MODE/SYNC (Pin 6) | Operating mode select | Configures Burst Mode (tie to INTVCC), pulse-skipping (tie to GND), or sync/forced continuous (apply external clock or 1V–2.4V). |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 3.5µA in Burst Mode - enables >1-year battery life in intermittent-use emergency radios without compromising startup time. |
| Integrated power switches | 0.37Ω PMOS + 0.15Ω NMOS - eliminates external MOSFETs and gate drivers, reducing BOM count and board area by ~30%. |
| Internal soft-start | 800µs ramp - prevents inrush current and output overshoot during power-up, critical for downstream logic integrity. |
| AEC-Q100 qualification | Grade E (–40°C to 125°C) - certified for automotive safety-critical subsystems including telematics and infotainment power rails. |
| Dropout operation | 100% duty cycle capability - maintains regulation as VIN approaches VOUT, essential for brownout resilience in 12V automotive systems. |
Applications
| Automotive Emergency Radio | Industrial Handheld Scanner |
|---|---|
Use Scenario: Powering AM/FM receiver, microcontroller, and audio amplifier from vehicle battery (9V–16V) with cold-crank tolerance down to 6V. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying core logic and analog front-end. Use Value: 3.5µA quiescent current prevents battery drain during standby; 1MHz switching avoids AM band interference (530–1710 kHz). |
Use Scenario: Providing regulated 5V rail for barcode imaging sensor, ARM Cortex-M MCU, and USB interface in ruggedized field equipment. IC Role / Device Role / Timing Role: Main system power converter with fast transient response to handle burst-mode image capture loads. Use Value: Peak current-mode control delivers <10µs recovery from 100mA–1A load steps; DFN package enables compact 2-layer PCB design. |
| Portable Medical Monitor | Smart Building Sensor Node |
Use Scenario: Generating clean 5V supply for ECG signal chain, display driver, and BLE radio in battery-powered patient-worn device. IC Role / Device Role / Timing Role: High-efficiency DC-DC converter supporting dual-mode operation (active sensing vs. sleep). Use Value: Burst Mode reduces average input current to <5µA in sleep, extending 2000mAh Li-ion battery life to >6 months. |
Use Scenario: Powering ultra-low-power MCU, environmental sensors (temp/humidity/CO₂), and sub-GHz wireless transceiver in energy-harvesting enabled node. IC Role / Device Role / Timing Role: Input-stage regulator accepting wide-range harvested source (e.g., 3.3V–15V from solar or thermal). Use Value: 2.7V minimum input allows operation during low-light solar harvesting; ±1% output accuracy ensures sensor ADC reference stability. |
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, adjustable 0.9V–6.05V output, 3.5µA IQ, 2.5MHz switching - lacks fixed 5V option and AEC-Q100 rating. | Suitable for non-automotive portable electronics where footprint and efficiency are prioritized over qualification. | Select when adjustable output and higher frequency (for smaller inductors) outweigh need for automotive compliance. |
| MAX17504ATP+T | 4.5V–60V input, 5V fixed output, 1.2A, 100µA IQ, 100kHz–2.2MHz programmable frequency - higher IQ and wider VIN but larger TQFN package. | Preferred for industrial systems with high-voltage inputs (e.g., 24V/48V rails) where dropout headroom is less critical. | Choose when input exceeds 17V or when extended thermal margin (θJA = 30°C/W) is required for convection-cooled enclosures. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3621EDCB-5#TRMPBF uniquely combines AEC-Q100 qualification, fixed 5V output, 1MHz frequency, and 3.5µA IQ in a 2mm × 3mm DFN - making it optimal for space- and reliability-constrained automotive and portable medical applications where regulatory compliance and ultra-low standby power are mandatory.
Availability
LTC3621EDCB-5#TRMPBF is available at Aetrix Electronics and suitable for automotive emergency radios, industrial handheld scanners, and portable medical monitors requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LTC3621EDCB-5#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 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 automotive systems demanding reliability and minimal board space.
FAQ
What is the output voltage tolerance of the LTC3621EDCB-5#TRMPBF?
The LTC3621EDCB-5#TRMPBF provides a fixed 5.0V output with ±1% accuracy over temperature and line/load conditions. This specification is guaranteed across the full –40°C to 125°C operating junction temperature range and ensures stable power delivery to precision analog circuits and microcontrollers without requiring external trimming or calibration. The LTC3621EDCB-5#TRMPBF achieves this via an internal 0.6V reference with <0.015%/V line regulation and <0.1% load regulation.
Does the LTC3621EDCB-5#TRMPBF require external feedback resistors?
No, the LTC3621EDCB-5#TRMPBF does not require external feedback resistors because it is a fixed-output variant - the FB pin is internally connected to the 5V output. Unlike adjustable versions (e.g., LTC3621EDCB), this eliminates resistor placement errors, reduces component count, and improves long-term output stability by removing external divider drift. The LTC3621EDCB-5#TRMPBF uses the same internal reference and error amplifier architecture but routes the feedback path internally.
Can the LTC3621EDCB-5#TRMPBF synchronize to an external clock?
Yes, the LTC3621EDCB-5#TRMPBF supports external clock synchronization via the MODE/SYNC pin, with a capture range of ±40% around its nominal 1MHz frequency (i.e., 600kHz to 1.4MHz). When an external clock is applied, the device enters forced continuous mode and locks to the incoming signal within 2–3 cycles. This capability enables EMI reduction through frequency dithering or alignment with system master clocks - a feature retained in the LTC3621EDCB-5#TRMPBF despite its fixed output configuration.
What thermal derating applies to the LTC3621EDCB-5#TRMPBF in its DFN package?
The LTC3621EDCB-5#TRMPBF in the 6-lead DFN package has θJA = 64°C/W and θJC = 9.6°C/W. With a maximum junction temperature of 125°C and ambient of 85°C, continuous 1A operation requires ≥1.5cm² of 2oz copper connected to the exposed GND pad. Derating begins above 85°C ambient: output current must be reduced linearly to zero at 125°C case temperature. The LTC3621EDCB-5#TRMPBF includes thermal shutdown that activates at ~150°C to protect against sustained overload.
Is the LTC3621EDCB-5#TRMPBF qualified for automotive applications?
Yes, the LTC3621EDCB-5#TRMPBF is AEC-Q100 qualified (Grade E, –40°C to 125°C) and manufactured under controlled automotive processes. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and ESD (HBM ≥2kV). This qualification is explicitly documented in Analog Devices' automotive reliability reports for the LTC3621 family, and the LTC3621EDCB-5#TRMPBF part marking "LGQC" confirms its automotive-grade DFN packaging and screening.
LTC3621EDCB-5#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 17V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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-5#TRMPBF FAQ
1.How can I place an order for LTC3621EDCB-5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621EDCB-5#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-5#TRMPBF reliable?
The price and inventory of LTC3621EDCB-5#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-5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621EDCB-5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621EDCB-5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621EDCB-5#TRMPBF?
LTC3621EDCB-5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621EDCB-5#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-5#TRMPBF?
For technical support, including LTC3621EDCB-5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621EDCB-5#TRMPBF requirements.
6.How does Aetrix verify that LTC3621EDCB-5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621EDCB-5#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-5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621EDCB-5#TRMPBF?
All LTC3621EDCB-5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621EDCB-5#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-5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621EDCB-5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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