RT9458WSC datasheet(3/27 Pages) RICHTEK

3 / 27 page

DS9458-02

February 2017

www.richtek.com

RT9458

is a registered trademark of Richtek Technology Corporation.

Functional Block Diagram

Operation

The RT9458 is a switch mode charger with USB-OTG

support for single cell Li-Ion battery in portable applications.

Base Circuits

Base circuits provide the internal power, VDD and reference

voltage and bias current.

Current Sense

Current sense circuit regulates the output current up to

1.5A to battery

Protection Circuits

The protection block includes the OVP, UVLO, OTP, Timer

and other circuits. It turns off the charging when the charger

IC or input power is in abnormal level.

Loop Controller and PWM and Driver

The multi-loop controller controls the PWM signal during

the charging process. The PWM circuit controls the power

stage through the driver. It makes sure that the battery is

well-charged with suitable current, voltage and die-

temperature.

I2C Interface

The I2C interface is used to program the charging

parameters, ex : output current and output voltage.

State Machine

The State Machine controls the operation of the switching

charger and outputs the interrupt via the IRQ pin if there is

any fault be triggered.

Base

VDD, Ibias,

VREF, OSC

Protection

OVP, UVLO,

OTP, Timer

PGND

AGND

VIN

SCL

Gate

Driver 1

BOOT

Gate

Driver 2

VMID

SDA

State

Machine

IRQ

OTG

BATS

Current

Sense

Loop

Control

ISNSIN

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