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Product Detailed Parameters
- Description：IC REG BUCK 0.8V 500MA 20QFN
- Series：-
- Mfr：Allegro MicroSystems
- Package：Tape & Reel (TR),Cut Tape (CT)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Fixed
- Number of Outputs：1
- Voltage - Input (Min)：3.5V
- Voltage - Input (Max)：36V
- Voltage - Output (Min/Fixed)：0.8V
- Voltage - Output (Max)：-
- Current - Output：500mA
- Frequency - Switching：250kHz ~ 2.4MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount, Wettable Flank
- Package / Case：20-WFQFN Exposed Pad
- Supplier Device Package：20-QFN (4x4)
- Grade：Automotive
- Qualification：AEC-Q100
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Overview
The ARG81800KESJSR-1 is a synchronous buck regulator from Allegro MicroSystems, designed for automotive applications with AEC-Q100 qualification. It features a wide input voltage range of 3.5V to 36V and delivers up to 1A output current. The device supports programmable switching frequencies between 250kHz and 2.4MHz, enabling optimization for efficiency and component size. It includes ultra-low quiescent current capabilities for light-load operation and offers external compensation for flexible design. Key protections include overvoltage, thermal shutdown, and undervoltage lockout.
Feature Summary
- Ultra-low quiescent current enables minimal power consumption during light-load or standby conditions.
- Programmable switching frequency allows balancing of efficiency, physical component size, and electromagnetic compatibility performance.
- External compensation provides flexibility to adjust the regulator for diverse system requirements across various operating frequencies.
- Integrated protection circuits ensure reliability through overvoltage, thermal shutdown, and undervoltage lockout mechanisms.
Applications
- Automotive electronic systems requiring qualified power regulation
- Battery-powered devices needing extended battery life through low standby current
- Embedded systems utilizing wide input voltage ranges
- Applications requiring precise output voltage adjustment via external feedback
Procurement Notes
Verify the specific suffix -1 against official datasheets to confirm pinout and functional variations. Ensure the package type matches the 20-WFQFN specification with exposed pad. Confirm AEC-Q100 compliance if automotive grade is required. Check for any recent product change notices regarding packaging or material composition updates before finalizing orders.
Selection Notes
Select this component when a wide input voltage range and high efficiency are critical. The adjustable output voltage suits designs requiring specific rail voltages not available in fixed regulators. Consider the external compensation requirement for layout complexity. Evaluate the thermal performance within the 20-QFN package for the expected load current and ambient temperature conditions.
Part Context
This part belongs to the ARG818 series of synchronous buck regulators. It shares architectural similarities with other members like the ARG81801 but differs in output current capacity and specific feature sets. The series targets automotive and industrial markets, emphasizing robustness and efficiency under varying load and input conditions.
Replacement Considerations
Direct substitutes may include other parts from the ARG818 family with compatible pinouts and electrical characteristics. Verify that alternative components meet the same AEC-Q100 automotive qualification standards. Ensure replacement packages match the 20-WFQFN form factor for board compatibility.
