RT9758 datasheet(39/61 Pages) RICHTEK

39 / 61 page

RT9758

is a registered trademark of Richtek Technology Corporation.

DS9758-03

May 2023

www.richtek.com

VBAT > 2V ?

VBAT > 3V ?

Yes

VBAT >

3.45V ?

Yes

Adapter plug in or

Wireless Power in

Yes

Input current

≤ I_TERM ?

VBAT

≥ CV ?

Yes

Terms :

CAL_V :

Voltage of input which is calculated according to requested

Input current, VBAT and resistance of the charging path.

I_TERM :

If Input current level is smaller than this value, terminate this

charging algorithm.

Yes

Switching charger in

trickle charge mode

Switching charger in

pre-charge mode

Switching charger in

fast-cahrge mode

Boot to kernel

Start other charging

algorithms

1. Set protections of RT9758 for DIV2 mode

2. Measure initial input current by switching charger

3. Disable switching charger

4. Set protections of RT9759

Calculate the resistance of the charging path

Increase input current according to VBAT

’s level and

set adapter/wireless power to CAL_V

1. Disable RT9759

2. Disable RT9758

3. Set RT9758 protection for BYPASS mode

Wait for 10 seconds or

RT9759 VBAT_ALM

interrupt triggered

Yes

Adapter supports PD PPS

charging (20V Prog) or Wireless

Power supports HV charging ?

Reach desired

charging level?

1. Set input voltage/current limit to desired value

2. Enable RT9758

3. Set input voltage to CAL_V

4. Enable RT9759 to start charging

5. Keep monitoring VBAT

Decrease input current and

set adapter/wireless power to CAL_V

Figure 6. System Control Flow Chart

RT9758 데이터시트(PDF) 39 Page - Richtek Technology Corporation

RT9758 데이터시트(HTML) 39 Page - Richtek Technology Corporation

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