R

RT5133

Copyright © 2021 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS5133-02

February

2021

www.richtek.com

15

Application Information

The RT5133 is a highly-integrated power management IC, which includes 8 LDOs, 3 GPO for portable camera

module. There are 2 ways to power on/off for each regulator.

1. It can be set at the registers 0x1A for power on and 0x1B for power off. When the HWEN pin toggles from low to

high, it will force all 8 LDO regulators power on. The HWEN pin toggles from high to low, it will force all 8 LDO

regulators to power off. The device also provides delay time selection by EN_TD bit. Because LDO7/8 PVIN is

from external Buck, the external Buck needs to be powered on first before LDO7/8 operates.

2. Individual on/off control by LDOx_EN bit.

VDDA

VOUT1

VOUT6

HWEN

BASE on ready time

~ 4ms

Ext. Buck_EN

Ext. Buck

VOUT7/8

VREF

EN_TD =

0 ~ 10ms

(±20%)

EN_TD =

0 ~ 10ms

(±20%)

Figure 1. Power ON/OFF Control

Over-Temperature Protection

The RT5133 also features over-temperature protection (OTP), and has three sensors of OTP0, OTP1 and OTP2.

They can be enabled in the registers (0x0A[7:5]).

The OTP can be triggered to shut down the device if the junction temperature exceeds TOTP, 150°C typically. The

channels which will be turned off can be selected by register (0x0A[4]).

If the junction temperature drops to TOTP_RECOVER, 110°C typically, the device can be reactivated.

VDDA

The VDDA power is from the VSYS directly and the operating input voltage range is from 2.8V to 5V. It is also a

power input for an internal analog base circuit and it needs to connect a 1

F ceramic capacitor between VDDA and

ground.

The device provides a VDDA Under-Voltage Protection (UVP) once the input voltage drop below 2.6V typically, the

UVP function is started and all channels will be turned off after 1ms.