RT9757A Datasheet | Richtek

Description The RT9757A is a high efficiency and high charge current charger. The efficiency is up to 98.2% when VBAT = 4V, IBAT = 2A and the maximum charge current is up to 8A in DIV2 mode. The efficiency is up to 99.1% when VBAT = 4V, IBAT = 1A and the maximum charger current is up to 5A in bypass mode. The device integrates smart cap divider topology, direct charging mode, external overvoltage protection control, an input reverse blocking NFET and 2-way regulation, a dualphase charge pump core, 14-way protection, 9-way system alarm, 8-Channel high speed analog-to-digital converter, USB BC 1.2 detection and UFCS protocol. The high speed analog-to-digital converter provides input and output voltage, current and temperature information for the host. The host can monitor the information by I2C serial interface. The remended junction temperature range is - 40C to 125C, and the ambient temperature range is - 40C to 85C. Applications - Smart Phones - Tablet Features - Integrates Cap Divider Mode (DIV2 Mode) and Direct Charging Mode (Bypass Mode) - Supports BC1.2 and UFCS Protocol - External OVPMOS Control and Regulation - High Absolute Maximum Rating of 37V - Fast Reaction Time 100ns and Fast Turn Off Time 100ns - VBAT Voltage Regulation (VBAT REG) - IBAT Current Regulation (IBAT REG) - Dual-Phase Charge Pump Core - 8A Output Current Capability - Efficiency Up to 98.2% when VBAT = 4V, IBAT = 2A (DIV2 Mode) - Efficiency Up to 99.1% when VBAT = 4V, IBAT = 1A (Bypass Mode) - 100k Hz to 1000k Hz Variable Switching Frequency Stay Out of Audio Band - Spread Spectrum Technology for EMI Reduction Simplified Application Circuit CBST1 CFLY1 CVAC D+ D- CVBUS I2C Host VAC OVPGATE VBUS BST1 CFH1...