RT9758 datasheet(44/61 Pages) RICHTEK

44 / 61 page

RT9758

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS9758-03

May 2023

Table 8. Rule of VBUS_LOW_ERR before Start Charging Process in 4 Operation Modes

Operation Mode

VBUS_LOW_ERR

STAT

OPERATION_MODE_SELECTION

bit

REVERSE_MODE_EN

bit

Bypass

Reverse Bypass

DIV2

Reverse DIV2

⚫

WRX Reverse Over-Current Protection

(WRX_IRE_OCP)

The WRX_IRE_OCP function monitors reverse input

current from VBUS to WRX_IN via Q0. And it only

active while Q0 is turned on. If Q0_CONTROL bit set

10 or 11, the Q0 will turn on and WRX_IRE_OCP will

start detecting reverse input current. If the reverse

input current is larger than WRX_IRE_OCP threshold

in tWRX_IRE_OCP_DEG time, the device will only reset

Q0_CONTROL bit to 00 in order to disable Q0

immediately. Users can adjust the WRX_IRE_OCP

threshold via register setting.

⚫

IBUS Over-Current Protection (IBUS_OCP)

The

device

integrates

bidirectional

IBUS_OCP

function to detect input current in 4 operation modes.

In reverse DIV2 mode and reverse bypass mode, if

IBUS current from VOUT to VBUS is larger than

IBUS_OCP threshold in tIBUS_OCP_DEG time, the

device will stop charging and reset CHG_EN bit and

REVERSE_MODE_EN bit to 0.

In DIV2 mode, if IBUS current from VBUS to VOUT

is larger than IBUS_OCP threshold in tIBUS_OCP_DEG

time, the device will stop charging and reset

CHG_EN bit to 0.

In bypass mode, if IBUS current from VBUS to VOUT

is larger than IBUS_OCP threshold in tIBUS_OCP_DEG

time, the device will stop charging and still keep

CHG_EN bit to 1. Users can adjust the IBUS_OCP

threshold via register setting.

⚫

Converter Over-Current Protection (CON_OCP)

The device integrates CON_OCP function to prevent

huge abnormal converter operating current in 4

operation modes. In reverse DIV2 mode and reverse

bypass mode, If the converter operating current is

larger than CON_OCP threshold, the device will stop

charging and reset CHG_EN bit and REVERSE_

MODE_EN bit to 0.

In DIV2 mode, If the converter operating current is

larger than CON_OCP threshold, the device will stop

charging and reset CHG_EN bit to 0.

In bypass mode, If the converter operating current is

larger than CON_OCP threshold, the device will stop

charging and still keep CHG_EN bit to 1.

⚫

Device Thermal Shutdown (TDIE_OTP)

The device integrates TDIE_OTP to prevent system

charging in over-temperature condition. The TDIE_

OTP function monitors die temperature. When the

device in standby mode or bypass mode or DIV2

mode, If the die temperature is higher than TDIE_

OTP threshold in tTDIE_DEG time, the device will stop

charging and reset CHG_EN bit to 0.

When the device in reverse bypass mode or reverse

DIV2 mode, If the die temperature is higher than

TDIE_OTP threshold, the device will stop charging

and reset CHG_EN bit and REVERSE_MODE_EN

bit both to 0.

After TDIE_OTP is triggered, the TDIE_OTP_EXIT_

FLAG will turn to high when die temperature lower

than TDIE_OTP release threshold. For safety, the

device should only enable charge again after

TDIE_OTP_STAT is set to 0 and TDIE_OTP_EXIT_

FLAG is set to 1.

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