ELECTRICAL PERFORMANCE CURVES
ELECTRICAL PERFORMANCE CURVES
300
300
3.00
Switcher I
LIM
(A)
2.80
2.60
2.40
2.20
2.00
-50
-50
0
50
0
50
Temperature (擄C)
Temperature (擄C)
Temperature (C擄)
100
100
f
OSC
(kHz)
f
OSC
(kHz)
Fosc (kHz)
Fosc (kHz)
295
295
290
290
285
285
280
280
-50
0
50
100
Temperature (擄C)
Figure 8. Switcher I
Lim
vs. Temperature
Figure 5. f
OSC
vs. Temperature
f
OSC
(kHz)
Oscillator frequency (kHz)
450
400
300
250
200
150
100
7
12
Rf (kOhm
Rf (k
鈩?
)
17
22
350
0.83
0.82
0.81
0.80
0.79
0.78
0.77
-50
0
50
100
V
REF
(V)
Vref (V)
Temperature
(擄C)
Te m pe rature
(C擄)
Figure 6. f
OSC
vs. Rf
Figure 9. V
REF
vs. Temperature
1
00
90
80
70
60
50
40
30
20
1
0
0
0
0,5
Vin=3.3V,
Vin=3.3V,
Vin=5.0V,
Vin=5.0V,
Vout=1.2V
Vout=1.8V
Vout=1.2V
Vout=1.8V
1
1
,5
25
23
21
19
17
15
13
11
9
7
5
0
100
200
300
RT (k
鈩?
with CT =
=
nF
RT (kOhm) with CT
33
33nF
Figure 10. Timer (ms) vs. RT
Switcher Efficiency [%]
Load Current [A]
Figure 7. Switcher Efficiency vs. Load Current
34701
Timer (ms)
14
Analog Integrated Circuit Device Data
Freescale Semiconductor