TCA785

TCA785 Application Field and Working Principle

The TCA785 is a multi-channel, low voltage Power Management Integrated Circuit (PMIC) device designed for use in battery operated applications such as portable medical, industrial and consumer products. It is one of the specialized power management (PM) devices specifically designed to support multiple operating voltage levels while managing the power sequencing, sequencing and power conversion needs of various system functions. The TCA785 integrates different circuits, including a programmable sequencer, a low dropout (LDO) linear regulator, a buck DC-DC converter, a switching regulator and a gate driver. It offers optimized system control to reduce heat dissipation and provide greater power efficiency.

Application Fields

The TCA785 is suitable for the following applications:

• Mobile handsets: Smartphones, feature phones, tablets and e-readers,
• Portable medical equipment: ECG machines, heart rate monitors and glucose monitors,
• Industrial equipment: Programmable Logic Controllers (PLC), Microcontroller Units (MCU), Analog and Digital Signal Processors (ADSP/DSP) and embedded systems.

Working Principle

The TCA785 offers a flexible, real-time control system for powerful and accurate power management, optimized for multiple voltage applications. The device integrates multiple converters and sequencing blocks with an internal switch matrix to control power sequencing. The power sequencing can be set to meet the unique needs of the application, allowing accurate and reliable switchover while ensuring the proper voltage and current levels are maintained. The TCA785 can also support dynamic adjustments to power sequences to better manage system load requirements. It also allows advanced power management features such as programmable voltage thresholds and various shutdown modes.

The TCA785 includes a LDO linear regulator to provide dedicated voltage and current regulation. The LDO operates in an open-loop and is configured to provide a constant current output. The switching regulator is designed to provide pulse width modulated (PWM) control and offer a high power density for applications where DC-DC conversion is required. The switching regulator regulates the output voltage and current, and can operate from a wide range of input voltages, from 0.5V to 5.5V.

The TCA785 also features a programmable logic sequencer to control the power-on and power-off sequencing of up to eight power-down systems. The programmable sequencer can detect voltage irregularities associated with power-on and power-off events, and offer various sequencing options, including sequencing between two voltages, sequencing between two voltage ranges, sequencing between two current levels, sequencing between two current ranges, sequencing between two voltage and current combinations. Finally, the TCA785 includes a gate driver to facilitate efficient switching of the MOSFETs used in power supplies or other power control devices.

Conclusion

The TCA785 is a multi-channel, low voltage power management integrated circuit (PMIC) device specifically designed to support multiple operating voltage levels while managing the power sequencing, sequencing and power conversion needs of various system functions. It has a variety of features to help meet the requirements of any application, including programmable sequencer, LDO linear regulator, switching regulator, gate driver, and power sequencer logics. The TCA785 offers a flexible and reliable system to help ensure accurate and reliable power switching, power sequencing and efficient power conversion.