BQ25713 datasheet(32/111 Pages) TI2

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monitoring, a resistor divider from CSA output to GND can be used and accuracy over temperature can still be

achieved.

• VIADPT = 20 or 40 × (VACP – VACN) during forward mode, or 20 or 40 × (VACN – VACP) during reverse OTG

mode.

• VIBAT = 8 or 16 × (VSRP – VSRN) during forward charging mode.

• VIBAT = 8 or 16 × (VSRN – VSRP) during forward supplement mode, reverse OTG mode and battery only

discharge scenario.

A maximum 100-pF capacitor is recommended to connect on the output for decoupling high-frequency noise. An

additional RC filter is optional. Note that RC filtering has additional response delay. The CSA output voltage is

clamped at 3.3 V.

8.3.16.2 High-Accuracy Power Sense Amplifier (PSYS)

The charger monitors total system power. During forward mode, the input adapter powers the system. During

reverse OTG mode and battery only discharge scenario, the battery powers the system and VBUS output. The

ratio of PSYS pin output current and total system power, KPSYS, can be programmed in PSYS_RATIO register

bit with default 1 μA/W. The input and charge sense resistors (RAC and RSR) are selected in RSNS_RAC bit and

RSNS_RSR bit. By default, PSYS_CONFIG=00b and PSYS voltage can be calculated with Equation 1, where

IIN>0 when the charger is in forward charging and IIN<0 when charger is in OTG operation; where IBAT<0 when

the battery is in charging and IBAT>0 when battery is discharging.

VPSYS =RPSYS·KPSYS(VACP·IIN+VSYS·IBAT)

(1)

RAC and RSR values are not limited to symmetrical both 5 mΩ or both 10 mΩ. For defined current sense resistors

(10 mΩ/5 mΩ), PSYS function is still valid when RAC=5 mΩ(RSNS_RAC=1b) and RSR=10 mΩ(RSNS_RAC=0b),

vice versa. As long as RSNS_RAC and RSNS_RSR bit status are consistent with practical resistors used in the

system.

Charger can block IBAT contribution to above equation by setting PSYS_CONFIG =01b in forward mode and

block IBUS contribution to above equation by setting PSYS_OTG_IDCHG=1b in OTG mode.

To minimize the quiescent current, the PSYS function is disabled by default PSYS_CONFIG = 11b.

Table 8-6. PSYS Configuration Table

CASE #

PSYS_CONFIG BITS

PSYS_OTG_IDCHG

BITS

FORWARD MODE PSYS

CONFIGURATION

OTG

MODE PSYS

CONFIGURATION

00b

PSYS = PBUS+PBAT

PSYS = PBUS + PBAT

00b

PSYS = PBUS+PBAT

PSYS =PBAT

01b

PSYS = PBUS

PSYS = 0

11b

PSYS = 0 (Disabled)

5 (Reserved)

10b

PSYS = 0 (Reserved)

8.3.17 Input Source Dynamic Power Management

The charger supports Dynamic Power Management (DPM). Normally, the input power source provides power for

the system load and/or charging the battery. When the input current exceeds the input current setting (IIN_DPM),

or the input voltage falls below the input voltage setting (VINDPM), the charger decreases the charge current to

provide priority to the system load. As the system current rises, the available charge current drops accordingly

towards zero. If the system load keeps increasing after the charge current drops down to zero, the system

voltage starts to drop. As the system voltage drops below the battery voltage, the battery will discharge to

supplement the heavy system load.

BQ25730

SLUSE65A – FEBRUARY 2021 – REVISED JANUARY 2024

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