Datasheet > RT5021

RT5021

更新时间： 2024-01-24 11:27:01

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
67页	1288K
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RT5021 技术参数

Status：	Active	Vin (min) (V)：	4.4
Vin (max) (V)：	6	Number of Channels：	9
Number of Buck Converters：	3	Number of Boost Converters：	1
Number of Negative Outputs：	0	Number of LED Drivers：	1
Number of LDO Regulators：	3	Features：	Internal Compensation;OCP;OVP;Power Good;UVP
Package Type：	WQFN5x5-40	Datasheet：	https://datasheet5.oss-cn-shanghai.aliyuncs.com/datasheets/richtek/DS5021-01.pdf

RT5021 数据手册

RT5021

6 + 3 Channels DC/DC PMU with Li-ion Battery Charger

for CMOS DSC/DV

General Description

Charging tasks are optimized by using a control algorithm

to vary the charge rate, including pre-charge mode, fast

charge mode and constant voltage mode. The charge

current can also be programmed via the I²C control

interface. The battery regulation voltage and current can

be adjusted by JEITAstandard temperature control or other

schemes set via the I²C interface. The internal thermal

feedback circuitry regulates the die temperature to optimize

the charge rate for all ambient temperatures. The charging

task will always be terminated in constant voltage mode

when the charging current reduces to the termination

current of 10% x I_{CHG_FAST}. The charger includes under

voltage and over voltage protection for the supply input

voltage, VIN. The charger includes USB charger detection

circuitry via D+ and D- pins of USB interface to detect

USB standard downstream ports (SDP), USB charging

downstream port (CDP), dedicated charger port (DCP),

or Apple/Sony charger ports. RT5021 uses some

indicators to show charger states : two open drain ports

CHGand CHG2, and an interrupt (INT) to immediately notify

the state change.

The RT5021 is a complete power supply solution for digital

still cameras and other hand held devices. The RT5021 is

composed of a multi-channelDC/DC power converter unit,

a single-cell linear Li-ion battery charger, a charger type

detector, and an I²C control interface.

The power converter unit includes one synchronous step-

up converter (CH1), one synchronous step-up/down

converter (CH2), three synchronous step-down converters

(CH3/4/5), two LDOs with input power as low as 1.5V

(CH6/8), one WLED driver in synchronous high-voltage

step-up mode or low-voltage current regulator mode (CH7),

and a keep-alive LDO (CH9) for RTC application. All

converters are internally frequency compensated and

integrate power MOSFETs. The power converter unit

provides complete protection functions : over current,

thermal shutdown, over voltage, and under voltage

protection. RT5021 has a WAKEUP impulse generation

circuitry to monitor VIN or BAT installation event. To fulfill

most of applications, RT5021 has six preset power on/off

sequences.

The battery charger includes Auto Power Path

Management (APPM).No external MOSFETs are required.

The charger can enter sleep mode when power is removed.

RT5021 has I²C interface to control rich functions of Power

Converter Unit and Charger Unit. The RT5021 is available

in the WQFN-40L 5x5 package.

Simplified Application Circuit

BAT

Charger for Battery

PVD1

VO2

LX3

Adapter/USB

VIN

Step-Up for Motor

Step-Up/Down for I/O

Step-Down for Core

Step-Down for Memory

Step-Down

RT5021

SYS

System Power

LX4

SCL

SDA

LX5

I C Control

VO6

PVD7

VO8

VRTC

LDO

Step-Up for LED Backlight

LDO

GND

LDO for RTC

is a registered trademark of Richtek Technology Corporation.

DS5021-01 April 2013

www.richtek.com

12 3 4 5 6 7...67

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