RT9758 datasheet(45/61 Pages) RICHTEK

45 / 61 page

RT9758

is a registered trademark of Richtek Technology Corporation.

DS9758-03

May 2023

www.richtek.com

⚫

Flying Capacitor Diagnose (CFLY_DIAG)

The device integrates CFLY_DIAG function to

diagnose the health of flying capacitors before

charging. The CFLY_DIAG function only active in

soft-start process of DIV2 mode and reverse DIV2

mode. After CHG_EN is enabled, the device starts

soft-start process with corresponding soft-start time

(tSS_DIV2 or tSS_REVERSE_DIV2) in DIV2 or reverse

DIV2 mode. In soft-start process, the CFLY_DIAG

function will diagnose the CFL pin level in each phase.

If the CFL level is higher than CFLY_DIAG detect

level (VCFLY_DIAG), the device will stop soft-start

process and reset CHG_EN bit to 0. The CFLY_DIAG

function will stop activating after the device charge

successfully. In normal charging case, If the flying

capacitor is short while charging, the device can be

protected by other protections (e.g., IBUS_OCP,

VBUS_OVP, VOUT_OVP or CON_OCP).

⚫

Output Pin Error Detection (VOUT_ERR)

The device integrates VOUT_ERR function to

prevent output pin abnormal short before charging.

The VOUT_ERR function only active in soft-start

process of bypass mode and DIV2 mode. After

CHG_EN is enabled, the device starts soft-start

process

with

corresponding

soft-start

time

(tSS_BYPASS, tSS_DIV2) in bypass or DIV2 mode. In

soft-start process of DIV2 mode, the VOUT_ERR

function will detect the VOUT pin level. If the VOUT

level can’t over than VOUT_ERR detect level

(VOUT_ERR), the device will stop soft-start process

and reset CHG_EN bit to 0.

In soft-start process of bypass mode, If VOUT_ERR

function is triggered, the device will stop soft-start

process and still keep CHG_EN bit to 1. And the

device will re-start again if start-up conditions are met.

At bypass mode case, the device operates like

Hiccup mode if VOUT pin short abnormally. The

VOUT_ERR function will stop activating after the

device charge successfully.

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