Datasheet > RT5021

RT5021

更新时间： 2024-01-26 05:57:34

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

Operation

CH8 : Generic LDO

The RT5021 is an integrated power solution for digital still

cameras and other small handheld devices. It includes

sixDC/DC converters, a WLEDdriver, a RTC LDO, and a

fully integrated single-cell Li-ion battery charger.

CH8 is a generic low voltage LDO for multiple purpose

power.

CH9 : Keep Alive LDO and RTC

CH9 is a LDO providing a 3.05V output for real time clock.

CH1 : Step-Up DC/DC Converter

CH1 is a step-up converter for motor driver power. The

converter operates at PFM or PWM current mode which

can be set by I²C interface.

Charger Unit

A Li-ion battery charger with automatic power path

management is designed to operate in below modes.

CH2 : Step-Up/Down DC/DC Converter

Pre-Charge Mode

CH2 is a step-up/down converter for I/O power. The

converter operates at PFM or PWM current mode which

can be set by I²C interface.

When the output voltage is lower than 2.8V, the charging

current will be reduced to a ratio of fast-charge current

set by A8.ISETA [3:0] to protect the battery life-time.

CH3 : Step-Down DC/DC Converter

Fast-Charge Mode

CH3 is a step-down converter for core power. The converter

operates at PFM or PWM current mode which can be set

by I²C interface.

When the output voltage is higher than 3V, the charging

current will be equal to the fast-charge current set by

A8.ISETA [3:0].

CH4 : Step-Down DC/DC Converter

Constant Voltage Mode

CH4 is a step-down converter for memory power. The

converter operates at PFM or PWM current mode which

can be set by I²C interface.

When the output voltage is near 4.2V and the charging

current falls below the termination current for a deglitch

time of 25ms, the charger will be turned off and CHG will

go to high.

CH5 : Step-Down DC/DC Converter

CH5 is a step-down converter. The converter operates at

PFM/PWM current mode.

Re-Charge Mode

When the chip is in charge termination mode, the charging

current gradually goes down to zero. Once the battery

voltage drops to below 4.1V for 100ms, the charger will

resume charging operation.

CH6 : Generic LDO

CH6 is a generic low voltage LDO for multiple purpose

power.

CH7 : WLED Driver

CH7 is a WLED driver that can operate in either current

source mode or synchronous step-up mode which is

determined by I²C interface control signal.

is a registered trademark of Richtek Technology Corporation.

DS5021-01 April 2013

www.richtek.com

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