ACT5880 datasheet(85/87 Pages) ACTIVE-SEMI

85 / 87 page

ACT5880

Rev 2, 03-Sep-13

- 85 -

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The package thermal dissipation is not designed to

handle the total heating generated by run every

circuit at its maximum rating, which is an over-killed

situation for true applications. The sum of nominal

LDO maximum current is 2.18A and the total

DC/DC input equivalent current is 0.95A to 1.06A

for battery voltage 3.6V to 4.2V, which are 2.4W to

3.3W

power

dissipation

respectively

the

ACT5880. Those numbers are greater than the

maximum power dissipation for the ACT5880 in FC

FBGA package, what is around 2W at 25°C.

Typical Operation Condition

The worst case thermal budget analysis against the

typical application is necessary. A sample case is

simultaneous video capture and transmission

operation condition. Table 12 is a reference for

thermal budget analysis with experience data.

Users should use their own data to replace those in

this table for their designs.

Table 12:

The Thermal Condition Analysis.

Thermal Budget Allocation during Charging

Reference to the total current in Table 12, what is

over the possible maximum charge current of the

ACT5880. This implies that in worst case there is

no current from adaptor is allocated for charge.

Eventually, the die temperature regulation to charge

current would allocate the thermal budget to other

circuits, to the circuit desired for system operation

firstly.

THERMAL ANALYSIS

CHANNEL

VOLTAGE

(V)

CURRENT

(mA)

BUDGE

LOAD BLOCK

OUT1

DC/DC

1.2

Out:600

In:190

0.07

COREs

OUT2

DC/DC

1.8

Out:350

In:165

0.07

Memory

OUT3

DC/DC

Out:300

In:390

0.13

4.3’’ Backlight

and OTG

OUT4

2.85

150

0.2

RF TxRx

OUT5

2.85

150

0.2

RF digital

OUT6

2.85

0.07

TCXO

OUT7

200

0.24

I/O, ROMs

OUT8

2.5

150

0.26

I/O, Memory

OUT9

1.2

0.15

PLL

OUT10

3.3

0.04

CODEC

OUT11

1.8

0.06

SIM

OUT12

1.8

150

0.36

Camera digital

OUT13

2.8

0.11

Camera analog

3 OD drivers

LED

1800

1.96

Total

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