Products Overview
ARG81800 Ultra-Low Iq, Wide Input, 2.4MHz, 1A Synchronous Buck Regulator
Allegro MicroSystems
ARG81800 includes all the control and protection circuitry to produce a PWM regulator with ±1.5% output voltage accuracy.
It has ultra-low quiescent current to enable keepalive supply operation with minimal current draw from the supply during very light load regulation.
The ARG81800 is available in either a 500 mA or 1 A version, so the physical size of the power components can be optimized for lower current systems, which reduces PCB area and saves cost.
PWM switching frequency can be programmed over a wide range to balance efficiency, component sizing, and EMC performance. If VIN decays and the duty cycle reaches its maximum, the ARG81800 will automatically fold back its PWM frequency to extend the duty cycle and maintain VOUT.
The ARG81800 employs Low Power (LP) mode to maintain the output voltage at no load or very light load conditions while drawing only microamps from VIN. The device includes a PWM/AUTO control pin so the system can dynamically force either PWM or AUTO mode by setting this pin high or low, respectively.
If the SYNCIN pin is driven by an external clock, the ARG81800 will be forced into PWM mode and synchronize to the incoming clock. EMI/EMC is reduced by the ARG81800's frequency dithering to the SYNCIN clock. A CLKOUT pin is provided so downstream regulators can be easily interleaved and dithered via their synchronization inputs.
| Part Number | Output Type | Number of Outputs / Synchronous Rectifier |
Voltage - Inpu | Voltage - Output | Current - Output | Frequency - Switching | Operating Temperature | Mounting Type | Package / Case | Supplier Device Package |
|---|---|---|---|---|---|---|---|---|---|---|
| ARG81800KESJSR | Adjustable | 1 / Yes | 3.5V~36V | 0.8V~36V | 1A | 250kHz ~ 2.4MHz | -40°C~150°C (TJ) | Surface Mount, Wettable Flank | 20-WFQFN Exposed Pad | 20-QFN (4x4) |
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Datasheet Download on Jun, 2019
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Everstar currently serves global semiconductor brands, including Allegro, AOS, Vincotech, and SHARP photocoupler, to offer products with complementary features. The products we carried integrate magnetic sensor chips, motor driver chips, power components, power modules, etc., to offer an extensive hardware infrastructure system design solution. The product applications focus on cloud server power suppliers, server cooling fan motor drivers, automotive power supply systems, LED lights, industrial motors, etc., targeted to broadly cover our customers' needs.
