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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 dual-phase 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 recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.
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) ► 100kHz to 1000kHz Variable Switching Frequency Stay Out of Audio Band ► Spread Spectrum Technology for EMI Reduction
8-Channel 12-bit ADC ► High Speed Data Rate for 128 Times Average Per Channel ► VBUS, IBUS, VOUT, VBAT, IBAT, TDIE, DP, DM 8-Channel for Voltage/Current/Temperature Measurement
Input Reverse Blocking NFET ► Block the Reverse Current
3-Error Charge Pump Switch Protection ► VBUS Voltage Too High Error Protection before Switch (VBUS_HIGH_ERR) ► VBUS Voltage Too Low Error Protection before Switch (VBUS_LOW_ERR) ► CFLY Short Error Protection Before Switch (CFLY_DIAG)
11-Way System Protection ► VAC Overvoltage Protection (VAC_OVP) ► VBUS Overvoltage Protection (VBUS_OVP) ► IBUS Overcurrent Protection (IBUS_OCP) ► Higher IBUS Overcurrent Protection (IBUS_OCP_H) ► IBUS Undercurrent Protection (IBUS_UCP) ► VOUT Overvoltage Protection (VOUT_OVP) ► VBAT Overvoltage Protection (VBAT_OVP) ► IBAT Overcurrent Protection (IBAT_OCP) ► Dropout Overvoltage Protection (VDR_OVP) ► TS Over-Temperature Protection (TS_OTP) ► Junction Over-Temperature Protection (TDIE_OTP)
9-Way System Alarm ► VBUS Overvoltage Alarm (VBUS_OVP_ALM) ► IBUS Overcurrent Alarm (IBUS_OCP_ALM) ► IBUS Undercurrent Alarm (IBUS_UCP-ALM) ► VBAT Overvoltage Alarm (VBAT_OVP_ALM) ► IBAT Overcurrent Alarm (IBAT_OCP_ALM) ► IBAT Undercurrent Alarm (IBAT_UCP-ALM) ► TDIE Over-Temperature Alarm (TDIE_OTP_ALM) ► DP Overvoltage Alarm (DP_OV_ALM) ► DM Overvoltage Alarm (DM_OV_ALM)
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