RT9458 datasheet, PDF - EEWORLD Datasheet

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RT9458: DescriptionSwitch-Mode Single Cell Li-Ion Battery Charger with USB-OTG, Active, 4.3V, 6V, 4.44V, 1.55A, AC Adapter;USB, Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP; CategoryPower/power management SingleCellLi-Ion; File Size250KB，27 Pages; ManufacturerRichtek Technology Corporation; Websitehttps://www.richtek.com/

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RT9458 Overview

Switch-Mode Single Cell Li-Ion Battery Charger with USB-OTG, Active, 4.3V, 6V, 4.44V, 1.55A, AC Adapter;USB, Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP

RT9458 Parametric

Parameter Name	Attribute value
Status	Active
Vin (min)(V)	4.3
Vin (max)(V)	6
Battery Charge Voltage (max)(V)	4.44
Battery Charge Current (max)(A)	1.55
Input Source	AC Adapter;USB
Features	Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP
Package Type	WL-CSP2.1x1.87-20(BSC)
Datasheet	https://datasheet5.oss-cn-shanghai.aliyuncs.com/datasheets/richtek/DS9458-03.pdf

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RT9458

Switch-Mode Single Cell Li-Ion Battery Charger

with USB-OTG

General Description

The RT9458 is a switch-mode single cell Li-Ion/Li-Polymer

battery charger for portable applications. It integrates a

synchronous PWM controller, power MOSFETs, input

current sensing, high accuracy voltage regulation and

charge termination circuits. The RT9458 also features USB

On-The-Go (OTG).

The RT9458 optimizes the charging task by using a control

algorithm to vary the charge rate via different modes,

including pre-charge mode, fast charge mode, and constant

voltage mode. The key charge parameters can be

programmed via the I

C interface. The RT9458 resumes

the charge cycle whenever the battery voltage falls below

an internal threshold and automatically enters sleep mode

when the input power supply is removed.

Other features include under-voltage protection, over-

voltage protection, thermal regulation and reverse leakage

protection.

The RT9458 is available in the small WL-CSP-20B

2.1x1.87 (BSC) package.

Features



Support Quick Start for Charger

High Accuracy Voltage/Current Regulation

Input Current Regulation : 100mA/500mA/700mA/

Minimum Input Voltage Regulation : 4.1V to 4.7V

Per 0.1V Step

Charge Voltage Regulation Accuracy :

1% (0 to

85°C)

Charge Current Regulation Accuracy :

Built-In Input Current Sensing and Limiting

Integrated Power MOSFETS for up to 1.55A Charge

Rate

Integrated Sensing Resistors for Charging Current

Sensing

Synchronous 1.5MHz Fixed Frequency PWM

Controller with up to 95% Duty Cycle

Reverse Leakage Protection to Prevent Battery

Drainage

Thermal Regulation and Protection

Over-Temperature Protection

Input Over-Voltage Protection

IRQ Output for Communication with I

Automatic Charging

RoHS Compliant and Halogen Free



Marking Information

4E : Product Code



4EW

W : Date Code

Applications



Cellular Telephones

Personal Information Appliances

MP3 Players

Portable Instruments

Simplified Application Circuit

To Adaptor/USB

VIN

VMID

RT9458

ISNSIN

OTG

SCL

SDA

IRQ

BATS

GND

Battery

is a registered trademark of Richtek Technology Corporation.

DS9458-03

December 2017

www.richtek.com

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