RT5133WSC datasheet(17/41 Pages) RICHTEK

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RT5133

is a registered trademark of Richtek Technology Corporation.

DS5133-02

February

2021

www.richtek.com

Low Dropout Regulator and Application Reference

Table 1. LDO Types and Brief Specifications

LDO

Name

Input Power

Domain

Controller Power

Domain

Output Voltage (V)

Imax (mA)

Application

LDO1

VSYS

1.8/2.5/2.7/2.8/2.9/3/3.1/3.2

300mA

VIO18

LDO2

VSYS

1.8/2.5/2.7/2.8/2.9/3/3.1/3.2

300mA

VAF

LDO3

VSYS

1.7/1.8/1.9/2.5/2.7/2.8/2.9/3

300mA

AVDD

LDO4

VSYS

1.7/1.8/1.9/2.5/2.7/2.8/2.9/3

300mA

AVDD

LDO5

VSYS

1.7/1.8/1.9/2.5/2.7/2.8/2.9/3

300mA

AVDD

LDO6

VSYS

1.7/1.8/1.9/2.5/2.7/2.8/2.9/3

300mA

AVDD

LDO7

External Buck

VSYS

0.9/0.95/1/1.05/1.1/1.15/1.2

600mA

DVDD

LDO8

External Buck

VSYS

0.9/0.95/1/1.05/1.1/1.15/1.2

1000mA

DVDD

LDO7/8

VSYS

1.8

10mA

Ext. EN

Over-Current Protection

All of LDOs have protection behavior when over-current

protection of the channel is triggered. When LDO

triggered OCP that channel will shut down after 5ms de-

bouncing time. The channel also provides fold-back

feature when over-current protection is triggered and it

can be disabled by LDOx_OCFB_EN bit.

Iout

Vout

Ioc

IOCFB

IRQB

OCFB_TD

5ms

[ OCFB Operation ]

Figure 4. OCFB Operation Diagrams

Output Discharge

Set LDOx_NDIS_EN bit to select output discharge

function, “0” : Disable. “1” : Enable.

Channel

Discharge Resistance (Typ. Value)

LDO1 to 6



LDO7 to 8



GPO Pin

The device provides 3 GPO pin to control external

device. The pin can be used as an enable input for any

of regulators or sequence group, and the usage is

defined by register. Because VOUT1_VIO18 is also a

pull-up voltage for GPO, the VOUT1 needs to power on

first before GPO operates.

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