BQ25708 datasheet(27/94 Pages) TI2

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resistors (RAC and RSR) are selected in REG0x31[3:2]. PSYS voltage can be calculated with Equation 1, where

IIN>0 IBAT<0 when the charger is in forward charging with an adapter connected, and IBAT>0 when the battery is

in discharging mode.

PSYS

ACP

BAT

)

(1)

For proper PSYS functionality, RAC and RSR values are limited to 10 mΩ and 20 mΩ.

To minimize the quiescent current, the PSYS function is disabled by default. It can be enabled by setting

REG0x31[4] = 1.

9.3.7 Input Source Dynamic Power Manage

Refer to Section 9.6.6.

9.3.8 Two-Level Adapter Current Limit (Peak Power Mode)

Usually adapter can supply current higher than DC rating for a few milliseconds to tens of milliseconds. The

charger employs two-level input current limit, or peak power mode, to fully utilize the overloading capability and

minimize battery discharge during CPU turbo mode. Peak power mode is enabled in REG0x33[5:4]. The DC

current limit, or ILIM1, is the same as adapter DC current, set in REG0x0F/0E(). The overloading current, or ILIM2,

is set in REG0x37[7:3], as a percentage of ILIM1.

When the charger detects input current surge and battery discharge due to load transient (both the adapter and

battery support the system together), or when the charger detects the system voltage starts to drop due to load

transient (only the adapter supports the system), the charger will first apply ILIM2 for TOVLD in REG0x33[7:6], and

then ILIM1 for up to TMAX – TOVLD time. TMAX is programmed in REG0x33[1:0]. After TMAX, if the load is still high,

another peak power cycle starts. Charging is disabled during TMAX,; once TMAX, expires, charging continues. If

TOVLD is programmed to be equal to TMAX, then peak power mode is always on.

TOVLD

TMAX

TOVLD

IBUS

ILIM1

ILIM2

ICRIT

ISYS

IBAT

Ba ery Discharge

PROCHOT

ICRIT_DEG

PROCHOT_WIDTH

Figure 9-1. Two-Level Adapter Current Limit Timing Diagram

9.3.9 Processor Hot Indication

When CPU is running turbo mode, the system peak power may exceed available power from adapter and

battery together. The adapter current and battery discharge peak current, or system voltage drop is an indication

that system power is too high. The charger processor hot function monitors these events, and PROCHOT pulse

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BQ25713, BQ25713B

SLUSD83C – JUNE 2018 – REVISED MAY 2023

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