RT9470 datasheet(39/50 Pages) RICHTEK

39 / 50 page

RT9470/D

is a registered trademark of Richtek Technology Corporation.

DS9470/D-02

October 2023

www.richtek.com

Normal

Cold

Hot

VOTG_CV

Voltage

Temperature

Enable Boost

Disable Boost

Figure 7. Thermal Protect During Boost Mode

⚫

Charging Safety Timer

The device has safety timer to prevent abnormal

charging time due to poor battery condition. The

device can be set CHG_SAFE_TMR bits to change

timer for fast charge cycle. When the safety timer

expires, the device stops charging, the IC_STAT =

1000 for charge fault, ST_CHG_TOUT = 1, and an

INT is asserted to the host. The safety timer can be

disable by setting CHG_SAFE_TMR_EN = 0.

Table 6. Charging Safety Timer

VBAT

Safety Timer

< VPRE_CHG

2 Hours

> VPRE_CHG

5 Hours, 10 Hours (Default),

15 Hours, 20 Hours

When the charger in AICR, MIVR, JEITA cool, JEITA

warm or thermal regulation, the safety timer’s

counter clock rate will be half.

For example, if charger in AICR status, and timer

setting is 10 hours, the actual safety timer will expire

in 20 hours. The extended charge timer setting can

be disabled by setting CHG_SAFE_TMR_2XT = 0.

The safety timer will be reset by :

Toggle CE pin

CHG_EN disable/enable

CHG_SAFE_TMR disable/enable

REG_RST is set.

⚫

MediaTek Pump Express+ (MTK, PE+)

The device can provide an input current pulse to

communicate with an MTK-PE+ high voltage adapter.

When PE_EN bit is enabled, the device can increase

or decrease adapter output voltage by setting

PE10_INC to the desired value. After enabling PE

function, the device will generate a VBUS current

pattern for the MTK-PE+ adapter to automatically

identify whether to increase or decrease output

voltage. Once the PE pattern is finished, PE_EN bit

will clear to 0, and an INT is asserted to the host to

indicate PE_DONE.

⚫

Adaptive Input Current Control (AICC)

The AICC function provides an adaptive AICR

setting to prevent input voltage drops. When the

input power source is over-current and the VBUS

drops to the MIVR level, set AICC_EN bit to 1, the

device will automatically decrease AICR level step

by step until exit MIVR event. Once AICC is finished,

AICC_EN bit will clear to 0, and an INT is asserted to

the host to indicate AICC_DONE.

VBUS

MIVR

Target

AICR

Adaptive AICR

by AICC

AICC_EN

50mA

Power Source

Current Limit

IBUS

Figure 8. AICC Enable

Status Outputs

⚫

Power

Good

Indicator

(PG

and

ST_CHG_RDY Bit)

The PG pin goes low to indicate a good power

source when :

VBUS above VBUS_MIN_RISE, and IBADSRC is

applied.

VBUS above VBAT (not in sleep mode)

VBUS below VAC_OVP threshold setting

HZ = 0 (not in HZ mode)

The charger thermal is under THREG threshold

setting

Completed VBUS Source Type Detection

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