NXP Semiconductors
PCA9624
8-bit Fm+ I 2 C-bus 100 mA 40 V LED driver
1. Find P tot (device total power dissipation)
– output current (60 mA ? 1 port); output power (60 mA ? 1 ? 0.5 V) = 30 mW
– output current (50 mA ? 6 ports); output power (50 mA ? 6 ? 0.5 V) = 150 mW
– output current (40 mA ? 1 port); output power (40 mA ? 1 ? 0.5 V) = 20 mW
Output total power = 200 mW
– chip core power consumption = 10 mA ? 5.5 V = 55 mW
– SCL power dissipation = 25 mA ? 0.4 V = 10 mW
– SDA power dissipation = 25 mA ? 0.4 V = 10 mW
P tot (device total power dissipation) = 275 mW
2. Find T j (junction temperature):
T j = T case + R th(j-a) ? P tot = 94.6 ? C + 30 ? C/W ? 275 mW = 102.85 ? C
11. Limiting values
Table 13. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
V DD
V I/O
V drv(LED)
I O(LEDn)
Parameter
supply voltage
voltage on an input/output pin
LED driver voltage
output current on pin LEDn
Conditions
Min
? 0.5
V SS ? 0.5
V SS ? 0.5
-
Max
+6.0
5.5
40
100
Unit
V
V
V
mA
I OL(tot)
total LOW-level output current
LED driver outputs;
[1]
800
-
mA
V OL = 0.5 V
I SS
P tot
P/ch
T j
T stg
T amb
ground supply current
total power dissipation
power dissipation per channel
junction temperature
storage temperature
ambient temperature
per V SS pin
T amb = 25 ? C
T amb = 85 ? C
T amb = 25 ? C
T amb = 85 ? C
operating
[2]
-
-
-
-
-
-
? 65
? 40
800
1.8
0.72
100
45
+125
+150
+85
mA
W
W
mW
mW
? C
? C
? C
[1]
[2]
Each bit must be limited to a maximum of 100 mA and the total package limited to 800 mA due to internal
busing limits. The pull-up (current limiting) resistor must be of sufficient size (W) and value ( ? ) to guarantee
that the 100 mA limit is not exceeded on any output.
Refer to Section 10.1 for calculation.
PCA9624
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 6 September 2012
? NXP B.V. 2012. All rights reserved.
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