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Analog Devices Inc. LTC3621IDCB#TRMPBF
- Part No.:
- LTC3621IDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3621IDCB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,553
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Product details
Overview
LTC3621IDCB#TRMPBF from Analog Devices is a 17V, 1A synchronous step-down regulator in a 6-lead (2mm × 3mm) DFN 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 space-constrained, battery-powered industrial sensors and automotive infotainment power rails.
For engineers reviewing the LTC3621IDCB#TRMPBF datasheet, LTC3621IDCB#TRMPBF pinout, LTC3621IDCB#TRMPBF application, or LTC3621IDCB#TRMPBF equivalent, key selection criteria include its 2.25MHz operation enabling compact magnetics, ultralow IQ for extended standby life, MODE/SYNC-configurable light-load behavior (Burst/Pulse-Skipping/Forced Continuous), internal compensation, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC3621IDCB#TRMPBF implements a constant-frequency peak current mode control architecture with internal slope compensation, enabling stable operation up to 100% duty cycle during dropout. Its error amplifier compares FB voltage against a 0.6V reference, dynamically adjusting ITH to regulate output across input voltages from 2.7V to 17V.
It integrates dual MOSFETs (top PMOS RDS(ON) = 0.37Ω, bottom NMOS RDS(ON) = 0.15Ω at VIN = 5V), features programmable soft-start (0.8ms), overtemperature protection, and VIN overvoltage lockout (19V rising, 18.7V falling) with automatic recovery and re-soft-start.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 17V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables direct regulation from 3.3V/5V rails down to core logic voltages via external resistor divider. |
| Switching Frequency | 2.25MHz (±40% sync range) - allows use of sub-3mm inductors and reduces EMI fundamental frequency. |
| Quiescent Current | 3.5µA in Burst Mode - extends battery life in always-on monitoring nodes with intermittent wake-up cycles. |
| Output Accuracy | ±1% over temperature and line/load - ensures reliable microcontroller core voltage compliance without margin overhead. |
| Peak Current Limit | 1.6A (I-grade) - provides robust short-circuit protection while sustaining 1A continuous output under thermal limits. |
| Thermal Performance | θJA = 64°C/W (DFN), TJMAX = 125°C - enables 1A operation in compact PCB layouts with minimal copper area. |
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 | Connection point for external inductor; carries high di/dt square wave - requires tight layout and low-inductance path to minimize EMI. |
| VIN (Pin 2) | Main 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 input | Active-high logic input; pulls regulator out of shutdown - must not float; 20nA leakage enables simple pull-up resistor control. |
| FB (Pin 4) | Feedback input | Senses divided output voltage; referenced to 0.6V internal bandgap - sets VOUT = 0.6V × (1 + R2/R1) for adjustable versions. |
| INTVCC (Pin 5) | Internal LDO output | 3.6V regulated supply for gate drivers and analog circuitry - requires ≥1µF ceramic bypass to GND for stability. |
| MODE/SYNC (Pin 6) | Operating mode select / clock sync | Configures Burst Mode (tie to INTVCC), Pulse-Skipping (tie to GND), Forced Continuous (1V–2.4V), or external clock sync (±40% range). |
| GND (Exposed Pad) | Power and 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 |
|---|---|
| Burst Mode® operation | Reduces IQ to 3.5µA at light loads while maintaining regulation - critical for >1-year battery life in IoT sensor nodes. |
| 2.25MHz fixed-frequency switching | Enables use of 2.2µH inductors <3mm height - shrinks solution size by >40% vs 500kHz alternatives. |
| Internal compensation | Eliminates external compensation network - simplifies design, reduces BOM count, and improves production yield. |
| AEC-Q100 qualified (I-grade) | Validated for automotive applications including infotainment, ADAS camera modules, and body control units. |
| Full dropout operation | Maintains regulation with VIN as low as VOUT + 0.3V - supports brownout resilience in 12V automotive systems during cranking. |
Applications
| Portable-Handheld Scanners | Automotive Applications |
|---|---|
|
Use Scenario: Battery-powered barcode scanners requiring ultra-low standby power 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-cell Li-ion (2.7V–4.2V). Use Value: 3.5µA quiescent current extends battery life to >6 months in sleep mode; 2.25MHz operation minimizes inductor footprint for ergonomic handheld form factor. |
Use Scenario: Powering infotainment display controllers in vehicles with wide input transients (cold crank, load dump). IC Role / Device Role / Timing Role: Point-of-load regulator delivering 1.2V/1A to ARM-based SoC cores with AEC-Q100 reliability assurance. Use Value: 17V absolute max rating and VIN OVP (19V) protect against automotive transients; ±1% accuracy ensures SoC stability across temperature. |
| Industrial and Embedded Computing | Emergency Radio |
|
Use Scenario: Remote edge-node gateway with isolated RS-485, LoRaWAN radio, and Cortex-M4 MCU operating on 12V field bus. IC Role / Device Role / Timing Role: Dual-output power stage (via two LTC3621IDCB#TRMPBF) generating 3.3V for MCU and 5V for interface ICs. Use Value: Adjustable VOUT and internal soft-start prevent inrush-induced bus droop; 2.7V min input supports degraded 12V rail operation. |
Use Scenario: Hand-cranked emergency radio requiring immediate power-up from low-voltage mechanical generator (3–6V output). IC Role / Device Role / Timing Role: Step-down regulator converting variable generator output to stable 3.3V for digital decoder and audio amplifier. Use Value: Full dropout capability enables regulation down to VIN = VOUT + 0.3V; zero-current shutdown (<0.1µA) preserves stored energy between cranks. |
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 | 3V–17V input, 3MHz fixed freq, 3.6µA IQ, but only 0.8V–6V adjustable VOUT; no SYNC capability; non-AEC-Q100. | Best for cost-sensitive consumer portables where AEC-Q100 and full VIN-to-VOUT adjustability are unnecessary. | Select when board space is tighter (2.5mm × 2.5mm QFN) and automotive qualification is not required. |
| MAX17504ATP+T | 4.5V–60V input, 2.2MHz, 1.2mA IQ (no Burst Mode), ±2% VOUT accuracy, integrated FETs rated for 2.5A. | Suitable for higher-input industrial power supplies (24V/48V rails), but lacks ultralow IQ for battery backup. | Choose for wide-input industrial HMIs where input exceeds 17V and efficiency at medium loads outweighs standby IQ. |
Compared with TPS62130ARGTR and MAX17504ATP+T, the LTC3621IDCB#TRMPBF uniquely combines AEC-Q100 qualification, 3.5µA IQ, full 0.6V–VIN adjustability, and 2.25MHz operation in a thermally enhanced 2mm × 3mm DFN - making it optimal for automotive and long-life battery systems where size, efficiency, and reliability are co-constrained.
Availability
LTC3621IDCB#TRMPBF is available at Aetrix Electronics and suitable for portable-handheld scanners, automotive infotainment subsystems, and industrial embedded computing requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3621IDCB#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 was designed specifically for space- and power-constrained applications demanding ultralow quiescent current, high-frequency operation, and automotive-grade reliability - targeting battery-powered instrumentation and vehicle subsystems.
FAQ
What is the maximum output current capability of the LTC3621IDCB#TRMPBF?
The LTC3621IDCB#TRMPBF is rated for up to 1A continuous output current under typical thermal conditions (θJA = 64°C/W, TA ≤ 85°C). Its peak current limit is specified at 1.6A for I-grade devices, providing headroom for transient loads. Actual deliverable current depends on ambient temperature, PCB copper area, and input/output voltage differential - derating is required above 85°C ambient or with insufficient thermal relief.
Does the LTC3621IDCB#TRMPBF support external synchronization of its switching frequency?
Yes, the LTC3621IDCB#TRMPBF supports external clock synchronization via its MODE/SYNC pin. It accepts an external clock signal within ±40% of its nominal 2.25MHz frequency (i.e., 1.35MHz to 3.15MHz), automatically locking to the external source within 2–3 cycles. When synchronized, the device operates in forced continuous mode, eliminating frequency jitter and easing EMI filtering design.
How does the MODE/SYNC pin configure operating modes on the LTC3621IDCB#TRMPBF?
The MODE/SYNC pin on the LTC3621IDCB#TRMPBF selects among three operational modes: tie to INTVCC for Burst Mode (3.5µA IQ, 400mA clamp), tie to GND for Pulse-Skipping Mode (lowest VOUT ripple), or bias between 1V and VINTVCC–1.2V for Forced Continuous Mode (fixed 2.25MHz, best transient response). It also serves as the SYNC input when driven by an external clock.
Is the LTC3621IDCB#TRMPBF qualified for automotive applications?
Yes, the LTC3621IDCB#TRMPBF is AEC-Q100 qualified for automotive applications (Grade I: –40°C to +125°C junction temperature). It includes built-in protections critical for automotive environments: VIN overvoltage lockout (19V rising), undervoltage lockout (2.7V), overtemperature shutdown, and robust ESD tolerance - meeting requirements for infotainment, telematics, and body electronics.
What is the feedback reference voltage and accuracy of the LTC3621IDCB#TRMPBF?
The LTC3621IDCB#TRMPBF uses a precision 0.6V internal reference voltage at the FB pin, with total output voltage accuracy of ±1% over temperature, line, and load conditions. This reference enables precise VOUT programming using standard resistor dividers (VOUT = 0.6V × [1 + R2/R1]), supporting designs requiring tight regulation for sensitive analog or digital loads.
LTC3621IDCB#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)
LTC3621IDCB#TRMPBF FAQ
1.How can I place an order for LTC3621IDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3621IDCB#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#TRMPBF reliable?
The price and inventory of LTC3621IDCB#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3621IDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3621IDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3621IDCB#TRMPBF?
LTC3621IDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3621IDCB#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#TRMPBF?
For technical support, including LTC3621IDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3621IDCB#TRMPBF requirements.
6.How does Aetrix verify that LTC3621IDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3621IDCB#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3621IDCB#TRMPBF?
All LTC3621IDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3621IDCB#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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3621IDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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