RT9758 datasheet(53/61 Pages) RICHTEK

53 / 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

Input current

≤ I_TERM ?

VBAT

≥ CV

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

Yes

Adapter plug in or

Wireless Power in

Adapter supports PD PPS

charging (20V Prog) or Wireless

Power supports HV charging?

1. Set input voltage/current limit to desired value

2.Enable RT9758_M

3. Set input voltage to CAL_V

4. Enable RT9759_M to start charging

5. Keep monitoring VBAT

Reach desired

charging level?

Yes

Input power allows both

of RT9758 to charge?

1. Set protection of RT9758 and RT9759 to parallel application

2. Disable RT9758_M and RT9759_M

3. Enable RT9758_S

4. Enable RT9758_M

5. Enable RT9759_S

6. Enable RT9759_M

Decrease input current and

set adapter/wireless power to CAL_V

RT9758_S is

enabled?

1. Disable RT9759_S

2. Disable RT9758_S

3. Disable RT9759_M

4. Disable RT9758_M

5. Set RT9758 protection for BYPASS mode

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.

Wait for 10 seconds or

RT9759 VBAT_ALM

interrupt triggered

Figure 14. System Control Flow Chart with Parallel Charge System

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