RT5028C datasheet(21/41 Pages) RICHTEK

21 / 41 page

DS5028C-03

September 2016

www.richtek.com

RT5028C

is a registered trademark of Richtek Technology Corporation.

EEPROM (MTP) Control Flow

The RT5028C embeds 32 bytes MTP memory, and it allows

users to save some I

2C register bank data to MTP. When

the I

2C register 0x3A Bit[0]/Bit[1] is wrote to

“1”, the

MTP Page1/Page2 will execute erase process firstly.

Because the erase process will be done in every writing

time, the MTP data will be missed. So it would be best

for users to read data from MTP to I2C first before

executing writing process.

Thermal Considerations

For continuous operation, do not exceed absolute

maximum junction temperature. The maximum power

dissipation depends on the thermal resistance of the IC

package, PCB layout, rate of surrounding airflow, and

difference between junction and ambient temperature. The

maximum power dissipation can be calculated by the

following formula :

PD(MAX) = (TJ(MAX)

− TA) / θJA

where TJ(MAX) is the maximum junction temperature, TA is

the ambient temperature, and

θJAis the junction to ambient

thermal resistance.

For recommended operating condition specifications, the

maximum junction temperature is 125

°C. The junction to

ambient thermal resistance,

θJA, is layout dependent. For

WQFN-56L 7x7 package, the thermal resistance,

θJA, is

°C/W on a standard JEDEC 51-7 four-layer thermal test

board. The maximum power dissipation at TA = 25

°C can

be calculated by the following formula :

PD(MAX) = (125

°C − 25°C) / (27°C/W) = 3.7W for

WQFN-56L 7x7 package

The maximum power dissipation depends on the operating

ambient temperature for fixed TJ(MAX) and thermal

resistance,

θJA. The derating curve in Figure 1 allows the

designer to see the effect of rising ambient temperature

on the maximum power dissipation.

Figure 1. Derating Curve of Maximum Power Dissipation

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

100

125

Ambient Temperature (°C)

Four-Layer PCB

Set I

2C Register 0x3A Bit[4] =1

PMU will read MTP data to

relative I

2C register bank.

Set I

2C Register 0x3A Bit[0]

PMU will erase the MTP page1

data

PMU will move relative I

Reading MTP process

Writing MTP process

Page 1 writing follow :

Set I

2C Register 0x3A Bit[5] =1

PMU will read MTP data to

relative I

2C register bank.

Set I

2C Register 0x3A Bit[1]

PMU will erase the MTP page2

data

PMU will move relative I

Reading MTP process

Writing MTP process

Page 2 writing follow :

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