1 General Description
The RT9758D is a high efficiency switching capacitor
converter for input >7.4V application. The efficiency is
up to 98.1% when VOUT = 10V, IOUT = 2A, switching
frequency = 500kHz, dual phase with VBUS input in cap
divider mode. The device integrates two phase
switching capacitor topology (DIV2 mode), bypass
mode, an input reverse blocking MOS and 9-way
protections. The default operation mode of the device is
DIV2 mode. User can use I2C to select the device
operating in bypass mode or reverse DIV2 mode or
reverse bypass mode. The maximum output current is
6A with DIV2 mode or 5A with bypass mode. In present
mode (̅EN̅̅̅ = H), the host can still issue commands by
the I
2C serial interface.
The recommended junction temperature range is −40C
to 125C, and the ambient temperature range is −40C
to 85C.

2 Applications
⚫ Smart Phones
⚫ Tablet
⚫ PC

5 Features
⚫ 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
⚫ 6A Output Current Ability with DIV2 Mode and
5A with Bypass Mode
⚫ Efficiency Up to 98.1% when VOUT = 10V, IOUT
= 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 PreCharge Timing for Charge Soft-Start
⚫ Support Converter Soft-Start with 500mA
Loading
⚫ Support Synchronize Function for Parallel
Application
⚫ Operation Mode Transfer Automatically between
Bypass Mode and DIV2 Mode (AT_Function)
⚫ I
2C 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 Overcurrent Protection (CON_OCP)
⚫ 6-Way System Protection
⚫ VBUS Overvoltage Protection (VBUS_OVP)
⚫ IBUS Overcurrent Protection (IBUS_OCP)
⚫ VOUT Overvoltage Protection (VOUT_OVP)
⚫ WRX Reverse Overcurrent Protection
(WRX_IRE_OCP)
⚫ VOUT Short Error Protection Before Charge
(VOUT_ERR)
⚫ Junction Over-Temperature Protection
(TDIE_OTP)