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 (?EN??? = 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)