RT9758 datasheet(41/61 Pages) RICHTEK

41 / 61 page

RT9758

is a registered trademark of Richtek Technology Corporation.

DS9758-03

May 2023

www.richtek.com

Protection Feature

The RT9758 integrates 9 protections to protect device charging in unexpected condition. These protections are

established in bypass mode, reverse bypass mode, DIV2 mode and reverse DIV2 mode. The Table 2 shows the

related configuration of 4 operation modes. For example, only just let EN pin pull to high or floating, the RT9758 will

operate in present mode for low quiescent current application. If let EN pin pull to GND and set CHG_EN bit to 0, the

RT9758 will entry standby mode. And if EN pin pull to GND and set CHG_EN bit to 1, the operation mode is decided

by OPERATION_MODE_SELECTION bit and REVERSE_MODE_EN bit setting.

About protections that is established in RT9758, the Table 3, Table 4, Table 5 and Table 6 shows the protect function

activation list in each mode. In Table 3

, “Stop charge” means the device will stop charge but the CHG_EN bit still

keep 1, so the device will soft-start again immediately if VBUS_LOW_ERR status is meet the rule and VBUS is exist.

Table 2. Configuration of 4 Operation Modes

Mode

EN Pin

CHG_EN

bit

OPERATION_MODE_SELECTION

bit

REVERSE_MODE_EN

bit

Present

H/Floating

Standby

Bypass

Reverse Bypass

DIV2 mode

Reverse DIV2

Table 3. Protection Function Activation List in Bypass Mode

Protection Function

Protection Method

VOUT_OVP

(Note 6)

1. Stop charge until fault release over 21m/100msec deglitch time (default)

2. Reset CHG_EN = 0

VBUS_OVP

(Note 6)

1. Stop charge until fault release over 21m/100msec deglitch time (default)

2. Reset CHG_EN = 0

IBUS_OCP

Stop charge

WRX_IRE_OCP

Set Q0_CONTROL = 00 (Note 7)

VOUT_ERR

Hiccup (Note 8)

TDIE_OTP

Reset CHG_EN = 0

CFLY_DIAG

Not active

CON_OCP

Stop charge

VBUS_LOW_ERR

Can't do soft-start until VBUS_LOW_ERR = 0 (Note 9)

Protection Method depends on AUTO_RECOVERY_EN bit and IN_VALID_RECOVERY_DEGLITCH bit.

The WRX_IRE_OCP only active while Q0 is turned on.

Hiccup off time depends on VOUT_ERR_OFF_TIME bit.

VBUS_LOW_ERR only active before converter soft-start.

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