RT5021 datasheet(39/67 Pages) RICHTEK

39 / 67 page

RT5021

DS5021-01 April 2013

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Suspend Mode

When USUS = 1, the charger will enter Suspend Mode. In Suspend Mode, CHG pin is high impedance and

IUSUS(MAX) < 300

μA.

Charging Current Decision

The charge current can be set according to the I2C register A8.ISETA [3:0] setting :

RT5021 allows user to set the battery charge current level and the list as below. The default

value is 0.5A.

Code

BAT Charge

Current

Code

BAT Charge

Current

Code

BAT Charge

Current

Code

BAT Charge

Current

0000

0.1A

0001

0.2A

0010

0.3A

0011

0.4A

0100

0.5A

0101

0.6A

0110

0.7A

0111

0.8A

1000

0.9A

1001

1010

1.1A

1011

1.2A

ISETA [3:0]

1100

1.2A

1101

1.2A

1110

1.2A

1111

1.2A

Fault-Time

Icharge

Example :

If the sensing battery temperature is hot or cold, the charge current will reduce to half charge current. So, the fault-time

will increase to be double.

JEITA Battery Temperature Standard

CV regulation voltage will be changed in the following battery temperature ranges : 0

°C to 10°C and 45°C to 60°C.

This function can be disabled by A9.VSETH and A9.VSETC.

CC regulation current will be changed in the following battery temperature ranges : 0

°C to 10°C and 45°C to 60°C.

This function can be disabled by A9.ISETH and A9.ISETC.

Fault-Time

During the fast charge phase, several events may increase the charging time.

For example, the system load current may have activated the APPM loop which reduces the available charging current

or the device has entered thermal regulation because the IC junction temperature has exceeded TREG.

However, once the duration exceeds the fault-time, the CHG output pin will flash at approximately 4Hz to indicate a fault

condition and the charge current will be reduced to about 1mA.

There are four methods to release the Fault-time :

Re-plug power

Toggle EN

Enter/exit suspend mode

Remove Battery

OVP

The fault-time is inverse proportional to the charger current.

RT5021 数据表(PDF) 39 Page - Richtek Technology Corporation

RT5021 数据表(HTML) 39 Page - Richtek Technology Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

数据表下载

链接网址

RT5021 数据表(PDF) 39 Page - Richtek Technology Corporation

RT5021 数据表(HTML) 39 Page - Richtek Technology Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

数据表 下载

链接网址

数据表下载