S-8356Q40MC-OYZT2U

Voltage - Supply (Vcc/Vdd):	0.9 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):	85%
Frequency - Switching:	600kHz
Series:	--
Output Phases:	1
Number of Outputs:	1
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The S-8356Q40MC-OYZT2U is a DC-DC switching controller developed by Shindengen Electric Mfg. Co., Ltd., a world-leading supplier of power management ICs (PMIC). The controller offers a maximum output current of 12A and a secondary side regulated output voltage of 0.6V to key interface circuits such as microcontrollers, LCDs, A/D converters and storage chips.The S-8356Q40MC-OYZT2U can be employed for a wide range of applications, most commonly in laptop and notebook computers, music players and other mobile applications such as cell phones, PDAs and digital cameras.

Application Field

The primary application fields for the S-8356Q40MC-OYZT2U are in power supply and power conversion systems. This device can be employed to generate the various required supply voltages within a complete power supply system, including generated BUCK and BOOST voltages on the primary side, and regulated output voltages on the secondary side. The device is also able to detect any voltage fault and immediately shut down the supply.The device is also used in various DC-DC conversion systems where the output voltage needs to be regulated. Examples of such systems include power converters for PLC systems, high speed laser systems and moisture measuring systems used in the agricultural industry.

Design Features

The S-8356Q40MC-OYZT2U features a low input voltage range (2.7V – 50V) and a high switching frequency (90 ~ 600KHz). The device is able to generate a secondary side output voltage from 0.6V to 14V to serve a wide range of applications. The output current of the device is limited to 12A.The device also includes several additional features such as varying switched frequency compensation, cycle-by-cycle current limiting, input over-voltage protection, input under-voltage lock-out safety features and over-temperature protection.

Working Principle

The S-8356Q40MC-OYZT2U is a DC-DC converter consisting of two switching transistors – an N-channel high-side transistor and a P-channel low-side transistor – and a control IC for controlling these two transistors. The control circuit senses the voltages on the primary and secondary sides and drives the two transistors accordingly.The two switching transistors are alternately enabled and disabled at a certain frequency in order to generate an output voltage on the secondary side. The regulated output voltage is generated by sensing the feedback voltage and compare it with a reference voltage. If the feedback voltage is lower than the reference voltage, the switching frequency is increased; if the feedback voltage is higher than the reference voltage. The switching frequency is decreased accordingly.The synchronization input can be used to synchronize the driving of the two transistors with the frequency of an external clock. This feature ensures that the output voltage waveforms occur at the same points on the external clock, thus providing more accurate output waveforms.

Conclusion

The S-8356Q40MC-OYZT2U DC-DC switching controller from Shindengen Electric Mfg. Co., Ltd. is an ideal choice for applications requiring a high output current and a regulated output voltage of 0.6V to 14V. The device features a wide input voltage range, high switching frequency and several design features for improved system performance and protection. The device is typically used in power supply and conversion systems and is suitable for a wide range of applications including laptop and notebook computers, music players and cellular devices.

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