S-8521A50MC-AYJT2U

Voltage - Supply (Vcc/Vdd):	2.5 V ~ 10 V
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	100%
Frequency - Switching:	180kHz
Series:	--
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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PMIC - Voltage Regulators - DC DC Switching Controllers

The S-8521A50MC-AYJT2U is a synchronous step down DC/DC switching controller from Sanken Electric Co Ltd. It is a highly efficient and compact power supply Integrated Circuit (IC) that offers a wide operating temperature range and long MTBF. This device is ideal for automotive applications, such as those found in powertrain and battery supply systems, where extended life and reliability are essential.The S-8521A50MC-AYJT2U enables the design of a wide variety of DC/DC switching converters, with input voltages ranging from 4.5V up to 55V, output ripple current up to 100mA and an adjustable voltage range from 0.6V to 0.8V. This allows for low output ripple voltages and a low stand-by current, making it suitable for applications where energy savings are important.The S-8521A50MC-AYJT2U works in pulse width modulation (PWM) mode to control the output voltage. The output voltage is determined by the open loop of the equation VOUT = (VREF-VREFL)/(VREFH-VREF +VREFL)). The VREF pins are used to set the output voltage, and the VREFL pin is used to recalibrate the output voltage. The S-8521A50MC-AYJT2U operates with a constant frequency, with a duty cycle control loop and two frequency bands to ensure stability. In pulse frequency modulation (PFM) mode, the duty cycle is adjusted by a single fixed- frequency clock and outputs up to four PWMs on the output pins with inputs connected to the feedback and supply pins. The output voltage is tracked with the feedback voltage based on a voltage divider network. External MOSFETs are driven by the PWM outputs to control the switching of the power stage and regulate the output voltage. A typical application includes a fixed frequency oscillator, a voltage detector, an ON/OFF (VREF) signal, a power stage and a synchronous rectifier. In a buck topology, the output current is driven through a low side MOSFET and the input voltage is regulated by a synchronous rectifier. The S-8521A50MC-AYJT2U incorporates many features to allow for improved efficiency and reliability. It includes a slew rate control for improved transient response, temperature compensation for improved accuracy, and protection features such as a hiccup mode for over current protection and a resistor for over-voltage protection. In summary, the S-8521A50MC-AYJT2U is a synchronous step down DC/DC switching controller from Sanken Electric Co Ltd that is suitable for automotive applications, such as powertrain and battery supply systems, where life and reliability are crucial factors. It provides an adjustable voltage range, temperature compensation, slew rate control, and protection features such as a hiccup mode and over-voltage protection resistor.

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