RT9758 datasheet(48/61 Pages) RICHTEK

48 / 61 page

RT9758

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS9758-03

May 2023

Table 9. Pre-charge Time in 4 Operation Modes

Operation Mode

Pre-charge Time

Pre-charged Capacitor

Bypass

VOUT_ERR_ON_TIME

COUT

Reverse Bypass

DIV2

CFLY_DIAG_TIME +

VOUT_ERR_ON_TIME

CFLY and COUT

Reverse DIV2

CFLY_DIAG_TIME

CFLY

Operation Mode Diagram

The RT9758 includes 4 operation modes, user can control device enter each mode by related register bits. The

Figure 10 shows the setting step between each mode. User needs to follow the recommend step to control device.

For example, the device can be transferred between bypass mode and DIV2 mode by two operation ways. The first

way is using AT_FUNCTION, and the second way is controlling by register setting. If user controls device by register,

the recommend operation flow as below: The first step is to order CHG_EN bit to 0 to make device into standby mode.

The second step is to set OPERATION_MODE_SELECTION bit and REVERSE_MODE_EN bit, then the last step

is to set CHG_EN bit to 1 for start charging. Based on above description, the OPERATION_MODE_SELECTION bit

and REVERSE_MODE_EN bit only can be changed while the device stays in standby mode or present mode.

Standby Mode

Bypass Mode

Reverse Bypass Mode

DIV2 Mode

Reverse DIV2 Mode

Present Mode

EN Pin=H/Floating

1. CHG_EN bit set to 0

2. EN Pin=L

1. EN Pin=L

2. Operation_Mode_Selection bit set to 0

3. Reverse_Mode_EN bit set to 0

4. CHG_EN bit set to 1

1. AT_Function_EN bit set to 1

2. Enable VOUT_PD

3. Increase VBUS

1. EN Pin=L

2. Operation_Mode_Selection bit set to 1

3. Reverse_Mode_EN bit set to 0

4. CHG_EN bit set to 1

1. AT_Function_EN bit set to 1

2. Decrease VBUS

CHG_EN bit set to 0

1. EN Pin=L

2. Operation_Mode_Selection bit set to 0

3. Reverse_Mode_EN bit set to 1

4. CHG_EN bit set to 1

1. EN Pin=L

2. Operation_Mode_Selection bit set to 1

3. Reverse_Mode_EN bit set to 1

4. CHG_EN bit set to 1

CHG_EN bit set to 0

Figure 10. Operation Mode Diagram

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