BQ25708 datasheet(77/94 Pages) TI2

77 / 94 page

REGN

plt

off

- V

, I

(10)

The conduction loss of the bottom-side MOSFET is calculated with the following equation when it operates in

synchronous continuous conduction mode:

Pbottom = (1 - D) x ICHG 2 x RDS(on)

(11)

When charger operates in non-synchronous mode, the bottom-side MOSFET is off. As a result all the

freewheeling current goes through the body-diode of the bottom-side MOSFET. The body diode power loss

depends on its forward voltage drop (VF), non-synchronous mode charging current (INONSYNC), and duty cycle

(D).

PD = VF x INONSYNC x (1 - D)

(12)

The maximum charging current in non-synchronous mode can be up to 0.25 A for a 10-mΩ charging current

sensing resistor or 0.5 A if battery voltage is below 2.5 V. The minimum duty cycle happens at lowest battery

voltage. Choose the bottom-side MOSFET with either an internal Schottky or body diode capable of carrying the

maximum non-synchronous mode charging current.

10.2.3 Application Curves

CH1: VBUS

CH2: VDDA

CH3: CHRG_OK

CH4: VSYS

2-cell without battery

Figure 10-3. Power Up from 20 V

CH1: VBUS

CH2: VDDA

CH3: CHRG_OK

CH4: VSYS

2-cell without battery

Figure 10-4. Power Up from 5 V

CH1: VBUS

CH2: SW1

CH3: SW2

CH4: IL

3-cell VBAT = 10 V

Figure 10-5. Power Off from 12 V

CH1: VBUS

CH2: SW1

CH3: SW2

CH4: VSYS with 9Vos

VBUS 5 V to 20 V

Figure 10-6. System Regulation

www.ti.com

BQ25713, BQ25713B

SLUSD83C – JUNE 2018 – REVISED MAY 2023

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