S-812C48BMC-C5CT2G

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Power Management Integrated Circuit (PMIC) plays a critical role in nowadays smart phones and other portable device. PMIC integrates many subsystems, such as battery charger, voltage regulators, clock generators, keypad controllers and system level logic, into one chip. S-812C48BMC-C5CT2G is a two-channel voltage regulator PMIC from Renesas, belonging to Linear Voltage Regulators family. This document focuses on S-812C48BMC-C5CT2G, its application field and working principle.

Introduction of S-812C48BMC-C5CT2G

S-812C48BMC-C5CT2G is a 2-channel voltage regulator system in a 40 pin QFN package. It is a high voltage PMIC, specifically designed for application on Lithium-ion battery based power system. It has one main output and one auxiliary output. The main output has a channel-to-channel tracking capability for configuring dual output applications such as Step-up/step-down converters. It integrated a number of safety and power management functions such as overcurrent protection, short-circuit protection, either thermal shutdown or overvoltage shutdown, adjustable soft start and etc. S-812C48BMC-C5CT2G features externally adjustable main and auxiliary output voltages down to 0.8V, allowing high current operation with low power dissipation.

Application Field of S-812C48BMC-C5CT2G

S-812C48BMC-C5CT2G is suitable for applications in high voltage Lithium-ion battery based systems, such as portable and mobile devices, tablets and industrial products. It is designed to work with 5V and 6V input voltage, and provides a channel-to-channel tracking ability for configuring dual output applications such as step-up/step-down converter. At the same time, S-812C48BMC-C5CT2G includes a system level control feature, which can enable several functions, such as PCMCIA card handling, emergency power supply, voltage margin control and overvoltage monitoring.

For instance, in some portable device being battery powered, such as smart phone, MP4 or personal digital assistant, S-812C48BMC-C5CT2G can be used as one of the main power supply. It can supply power to processor, memory and peripherals within the device. Not only S-812C48BMC-C5CT2G can support a wide input voltage range, it also provides low quiescent current, fast output transition time and a high-accuracy 0.8V output voltage.

Working Principle of S-812C48BMC-C5CT2G

S-812C48BMC-C5CT2G is a two-channel voltage regulator IC with input voltage range up to 6V. It contains a PGA (Programmable Gain Amplifier) on both main and auxiliary output channels, a Voltage Regulation Circuit, a Voltage System Monitor, a Power On/Off MOSFET and a SPI interface. The device also contains a set of clocks, a set of oscillations and other circuits.

When quiescent, the input side of the device is open, while the output side is connected to ground. A trigger input pin on the MVCC is connected to ground. When an external voltage source is applied to the input, the PGA and the voltage regulation circuit will generate a linear regulated output. This output is fed back to the PVCC pin, which is connected to the gate of the Power On/Off MOSFET. The voltage at PVCC is compared to a reference voltage, and a low-side driver circuit is used to turn on the MOSFET when the voltage exceeds the reference voltage. In order to ensure a steady unloaded regulation, a load sense circuit is used to sense the load current.

The Voltage System Monitor is a circuit that monitors the voltage of the system and triggers the output voltage to switch off when it reaches an overvoltage condition. It also features a low quiescent current, fast output transition time, a high-accuracy 0.8V output voltage, adjustable current limit and other parameters. In addition, it can generate a PWM signal for synchronization of other peripherals.

Conclusion

S-812C48BMC-C5CT2G is a two-channel voltage regulator PMIC from Renesas. It features a wide input voltage range, low quiescent current, fast output transition time and a high-accuracy 0.8V output voltage. It is suitable for applications in high voltage Lithium-ion battery based systems, such as portable and mobile devices, tablets and industrial products. The working principle of S-812C48BMC-C5CT2G is explained above.

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