33984 Datasheet, PDF (30/38 Pages) Freescale Semiconductor, Inc – Dual Intelligent High-current Self-protected Silicon High Side Switch (4.0 mOhm)

TYPICAL APPLICATIONS
OUTPUT CURRENT MONITORING
Figure 12 shows the CSR0 tolerance in function to 3
previous listed contributors in comparison to the minimum
and maximum specified values.
Current Recopy at Vbat=9V/16V from -40°C to
125°C
24000
23000
22000
21000
Max(Data_16V) at 6 sigmas
10%
20000
Min(Data_16V) at 6 sigmas
19000
Spec_max
Max(Data_9V) at 6 sigmas
Average (Data)
Min(Data_9V) at 6 sigmas
18000
17000
Spec_min
16000
10
15
20
25
Output current (A)
Figure 12. CSR0 Ratio Deviation in Function All
Contributors
Lower VPWR Voltage causes more error. 9.0 V
corresponding to the worst case. Figure 13 shows the CSR0
tolerance without battery variation effect.
Current Recopy at Vbat=9V from -40°C to 125°C
24000
23000
22000
21000
20000
19000
18000
17000
16000
10
15
20
25
Output current (A)
Figure 13. CSR0 Ratio Deviation in Function
Manufacturing and Temperature
The main contributor is the manufacturing deviation, as
described in Figure 14. At 15 A of output current, the
tolerance will be about 8.5% versus 10% when all
contributors are considered.
Current Recopy at Vbat=9V at 25°C
24000
23000
22000
21000
20000
8.5%
Spec_max
Max(Data) at 6 sigmas
Average (Data)
19000
18000
17000
Min(Data) at 6 sigmas
Spec_min
16000
10
15
20
25
Output current (A)
Figure 14. CSR0 Ratio Deviation in Function
Manufacturing
PART CALIBRATION
With a calibration strategy, the part to part contribution can
be removed.
An experiment was done on low output current values
(below 5.0 A). The relative CSR0 deviation based on only
one calibration point per output (5.0 A, VPWR=16 V at 25°C)
has been performed on 3 production lots. Those parts have
tested at initial and after High Temperature Operating Life
test in order to take into account the ageing of devices.
Table 19 summaries test results covering 99.74% of parts.
Table 19. CSR0 Precision for Several Output Current
Values with One Calibration Point at 5.0 A
CSR0 ratio
Min
Max
0.5 A
1.0 A
2.5 A
5.0 A
-25%
-12%
-8.0%
-5.0%
25%
12%
8.0%
5.0%
33984
30
Analog Integrated Circuit Device Data
Freescale Semiconductor