TPS65217 Single-Chip PMIC for Battery-Powered Systems
Created: Sep 06, 2016
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In battery-powered systems, it is important that battery-charging circuits are reliable and accurate to ensure the performance. This reference design makes use of TPS65217 single-chip power management IC that is designed for battery-operated systems. This IC provides linear battery charger for single-cell Li-ion and Li-Polymer batteries. It has dual-input power path, which means it, can be supplied by any combination of USB port, 5V AC adaptor or Li-Ion battery. Also, it has three step-down converters, four LDOs, and a high-efficiency boost converter to power two strings of up to 10 LEDs each.
This reference design is a fully assembled platform for evaluating the performance of TPS65217 IC. This is powered by a DC power supply that is capable of delivering up to 5V and 3A. Three high-efficiency 2.25-MHz step-down converters can provide the core voltage, memory, and I/O voltage for a system. The default output voltages for each converter can be adjusted through the I2C interface. All three converters feature dynamic voltage positioning to reduce the voltage undershoots and overshoots. Typically, the converters work at a fixed-frequency Pulse Width Modulation (PWM) at moderate to heavy load currents. At light load currents, the converters automatically enter power save mode and operate in Pulse Frequency Modulation (PFM). The two LDOs (LDO1 and LDO2) support system-standby mode. By default only LDO1 is always ON but any rail can be configured to remain up in SLEEP state especially the DC-DC converters can remain up in a low-power PFM mode to support system suspend mode. The TPS65217 offers configurable power-up and power-down sequencing and several housekeeping functions such as power-good output, pushbutton monitor, and hardware reset function and temperature sensor to protect the battery. Two power-good logic signals are provided; the main power-good, which monitors DCDC1, DCDC2, DCDC3, LS1/LDO3, and LS2/LDO4; if the load switches are configured as LDOs. The main power-good signal can be configured to monitor LDO1 and LDO2. This signal is high in ACTIVE state, but low in SLEEP, RESET, and OFF state. The LDO_power-good monitors LDO1, and LDO2; the signal is high in ACTIVE and SLEEP state, but low in RESET or OFF state. The signals are both pulled low when all the monitored rails are pulled low or when one or more of the monitored rails are enabled and have encountered a fault, typically output short or overcurrent condition.
This device is designed to support portable and 5V non-portable applications. This is a single-chip solution to battery-powered systems such as AM335x ARM Cortex-A8 microprocessors, portable navigation systems, tablet computing, and 5V industrial equipment.