RT9481 datasheet(4/41 Pages) RICHTEK

4 / 41 page

RT9481

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS9481-00 June 2015

Function Blocks Diagram

MOS

Analog Base

2.7A SWCHG

3A Boost Controller

VMID

USBOUT

VDD28V

INT

BOOT

VDDA

PGND

ISENSN

ISENSP

VBUS

SDA

SCL

LDSW

Attach

/Detach

DCP

Control

VHMID

LDO 2.8V

Central Logic

Control

ADC

IUSBOUT

IBAT

VBUS

VBAT

VDDA

Adapter

Detection

D+

D-

AGND

USBOUT

Operation

The RT9481 is a high integrated IC for Li-Ion battery

power bank. It includes a Switch charger 2.7A, a

synchronous Boost 5V.

Charge Current

Base on thermal regulation function, the charging

current can support up to 2.7A.

VBUS Over Voltage Protection

If the input voltage (VBUS) is higher than the

threshold voltage VOVP, the internal OVP signal will

go high and the charger will stop charging until VIN is

below VOVP

 hysteresis.

VMID Over Voltage Protection

If the internal voltage (VMID) is higher than the

threshold voltage VOVP, the internal OVP signal will

go high and the charger will stop charging until VMID

is below VOVP  hysteresis.

VMID Under Voltage Protection

If the internal voltage (VMID) is lower than the

threshold voltage VUVP, the internal VMID_UVP

signal will go high and the system will disable LDSW

function in order to protect system from short-to-

ground current damages.

USBOUT SCP

The USBOUT short circuit protection (SCP) function

will prevent system from burning out by monitoring

the voltage drop between LDSW. If the USBOUT is

short to ground, the inrush current will make the VDS

voltage too large to damage chip. The SCP function

also reports this condition to protect chip in time.

Boost OCP

The converter senses the current signal when the

high-side P-MOSFET turns on. As a result, The OCP

is cycle by-cycle current limitation. If the OCP occurs,

the converter holds off the next on pulse until

inductor current drops below the OCP limit.

OTP

The converter has an over-temperature protection.

When the junction temperature is higher than the

thermal shutdown rising threshold, the system will be

latched and the output voltage will no longer be

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