For a wide range of mobile products, such as smartphones, tablets, handheld medical devices, industrial PDAs, barcode readers and portable instruments, the TC7734FTG PMIC uses a 130-nm analogue semiconductor process with very low on-resistance (power path FET's on-resistance is typically 220mΩ) and low gate charge characteristics, and integrates multiple power management blocks within a single device.
TC7734FTG integrates power path, switching charger, four buck converters, three low-dropout (LDO) regulators and two LED backlight drivers. The charger block detects various USB port conditions and restricts the input current to 100 mA, 500 mA, 1A or 1.5A. All charger functions operate automatically without the need for any external control signals and it automatically changes the system power source between the battery and USB connection as needed.
The IC also features an external thermistor that detects the battery’s temperature, helping to prevent overheating while the mobile device is charging. Various thresholds and settings of the charger functions can be programmed by the on-board I²C interface. Individual settings of various output voltage levels, power sequences and many other functions can be programmed via I²C. User-programmable eFuse register settings enable the device to meet the needs of a wide variety of platforms.
In a 9 x 9 mm QFN64 package, the TC7734FTG supports input voltage ranging from 3.4V to 5.5V. The IC integrates various error detect functions, including thermal detect, over current limitation and LED open/short detection.