High Voltage Smart Cap Divider and Direct Charge Charger

RT9758

The RT9758 is a high efficiency and high charge current charger for high voltage application. The efficiency is up to 98.1% when V_OUT = 10V, I_OUT = 2A, switching frequency = 500kHz, dual phase with VBUS input in cap divider mode. The RT9758 maximum charge current is up to 5A. The device integrates cap divider topology (DIV2 mode), direct charge topology (Bypass mode), an input reverse blocking NFET, a dual-phase charge pump core, the EN pin control and 9-way protection. In present mode (EN = H), the host can still order the command 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.

應用

Smart Phones
Tablet
PC

主要規格

	RT9758
Status	Active
Vin (min) (V)	4
Vin (max) (V)	21
Battery Charge Voltage (max) (V)	10.5
Battery Charge Current (max) (A)	5
Status Indicator	No
Charger Type	Switching
Input Source	AC Adapter;USB
Features	Adjustable Frequency;Adjustable Soft-Start;Built-in Bootstrap Switch;Cycle-by-Cycle Current Limit;Enable Input;I2C;OCP;OVP;Stable with Ceramic Capacitor;UVP
Package Type	WL-CSP2.74x2.84-36(BSC)
Built-in Power MOSFETs	Yes

關鍵特性

Integrated Bidirectional Bypass Mode and Cap Divider Mode (DIV2 Mode)
Input Reverse Blocking NFET between WRX_IN Pin and VBUS Pin
► Block the Reverse Current
Dual-Phase Charge Pump Core
► 5A Output Current Capability
► Efficiency Up to 98.1% when V_OUT = 10V, I_OUT = 2A, Switching Frequency = 500kHz and Dual Phase with VBUS Input in DIV2 Mode
► 300kHz to 1.5MHz Variable Switching Frequency Stay Out of Audio Band
► Spread Spectrum Technology for EMI Reduction
► Adjustable Single-Phase or Dual-Phase for DIV2 Mode
► Programmable Pre-Charge Current and Pre-Charge Timing for Charge Soft-Start
► Support Converter Soft-Start with 200mA Loading
Support Synchronize Function for Parallel Application
Operation Mode Transfer Automatically between Bypass Mode and DIV2 Mode (AT_Function)
I²C is Available when Device in Present Mode
3-Error Charge Pump Switch Protection
► VBUS Voltage Too Low Error Protection before Switch (VBUS_LOW_ERR)
► CFLY Short Error Protection Before Switch (CFLY_DIAG)
► Converter Over-Current Protection (CON_OCP)
6-Way System Protection
► VBUS Over-Voltage Protection (VBUS_OVP)
► IBUS Over-Current Protection (IBUS_OCP)
► VOUT Over-Voltage Protection (VOUT_OVP)
► WRX Reverse Over-Current Protection (WRX_IRE_OCP)
► VOUT Short Error Protection Before Charge (VOUT_ERR)
► Junction Over-Temperature Protection (TDIE_OTP)