RT9470 datasheet(41/50 Pages) RICHTEK

41 / 50 page

RT9470/D

is a registered trademark of Richtek Technology Corporation.

DS9470/D-02

October 2023

www.richtek.com

Name

STAT

IRQ

MASK

SYS_MIN

SYS_SHORT

OTP

VAC_OV

WDT

OTG_CC

OTG_LBP

OTG_FAULT

Protections

⚫

VBUS Over-Voltage Protection in Buck Mode

VBUS

voltage

over

VAC_OVP

setting

(programmable by VAC_OVP bits), the device stops

switching immediately and an INT pulse is asserted

to the host. When VBUS overvoltage, the status

ST_VAC_OV = 1 and the IC_STAT = 1000 for

charge fault. The device resume to normal operation

when VBUS voltage drops below the VAC_OVP

threshold.

⚫

VBUS Over-Voltage Protection in Boost Mode

When boost mode, VAC_OVP setting is locked at

6.5V even if VAC_OVP threshold is set at 10.5V or

14V. When the output voltage (VBUS) exceeds

VAC_OVP threshold, the device stops switching

immediately, clear OTG_EN bit to 0 and exit boost

mode. The fault (OTG_FAULT) is set to high and an

INT pulse is asserted to the host to indicate in boost

mode. When the output voltage falling VAC_OVP_HYS

below VAC_OVP threshold, the OTG_EN bit can be

set to 1 by the host.

⚫

IBUS Overload Protection in Boost Mode

The device monitors boost output voltage and

current to provide VBUS short circuit protection. The

device also builds in constant current regulation to

allow OTG to adaptive to various types of load. If

short circuit is detected on VBUS, the boost will

hiccup 7 times. If boost retries are not successful,

OTG_EN bit will set to 0 to disable boost mode and

INT pulse is asserted to the host to indicate

OTG_FAULT.

⚫

VBUS Soft-Start

When the boost function is enabled, the device

soft-starts on VBUS to avoid inrush current.

⚫

VSYS Over-Voltage Protection

SYSOVP threshold is set at 5.2V. Once VSYS is

above

SYSOVP

level,

buck

stops

switching

immediately and an INT pulse is asserted to host to

indicate CHG_SYSOV fault. The device provides

30mA current sink on VSYS to bring down the VSYS

voltage.

⚫

VSYS Over-Current Protection

When the system is shorted or overloaded (IBAT >

IOCP_BATFET), the device latches off BATFET (forces

enter shipping mode) and an INT pulse is asserted to

host to indicate SYS_SHORT fault. Exit shipping

mode can reset the latch-off condition and turn on

BATFET.

⚫

Battery Over-Voltage Protection

The BAT_OVP threshold is 4% above the VBAT_REG

setting. When battery exceeds overvoltage threshold,

the device disables charging immediately and an INT

is asserted to the host to indicate CHG_BATOV.

⚫

Battery Over-Discharge Protection

When battery is discharged below VBAT_DPL_FALL,

the BATFET turns off to protect battery over

discharged. When VBUS is plugged in, the BAFET

turns on to charge battery.

RT9470 Datasheet(PDF) 41 Page - Richtek Technology Corporation

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