ELECTRICAL CHARACTERISTICS
Table 3. Electrical Characteristics (continued)
Characteristics noted under conditions VIN = 12 V, VOUT = 42 V, ILED = 50 mA, PWM = VDC1, M/~S = VDC1,
PIN & NIN = VDC1, -40°C ≤ TA ≤ 105°C, PGND = 0 V, unless otherwise noted.
Characteristic
OVER-VOLTAGE PROTECTION
Symbol
Min
Typ
Max
Unit
Over-voltage Clamp - OVP Register Table:
OVP = Fh
OVP = Eh
OVP = Dh
OVP = Ch
OVP = Bh
OVP = Ah
OVP = 9h
OVP = 8h
OVP = 7h
OVP = 6h
OVP = 5h
OVP = 4h
OVP = 3h
OVP = 2h
OVPFH
OVPEH
OVPDH
OVPCH
OVPBH
OVPAH
OVP9H
OVP8H
OVP7H
OVP6H
OVP5H
OVP4H
OVP3H
OVP2H
OVPHW
60.5
56.5
53
62.5
58
54
51
47
43
39
36
32
28
24
20
16
12
6.5
64.5
60
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
56
49
52.5
48.5
44.5
40.5
37.5
33.5
30
45
41
38
34
30.5
26
23
25
19
21
15
17
11
13
Over-voltage threshold,
6.15
6.85
Set by Hardware, Voltage at A0/SEN
A0/SEN Sink Current
I
-
100
-
μA
SINK_OVP
BOOST
Switching Frequency (BST [1:0]=0)
Switching Frequency (BST [1:0]=1)
Switching Frequency (BST [1:0]=2)
Switching Frequency (BST [1:0]=3)
Minimum Duty Cycle
fSW0
fSW1
fSW2
fSW3
DMIN
DMAX
tSS
0.14
0.15
0.30
0.60
1.2
10
0.17
MHz
MHz
MHz
MHz
%
0.27
0.33
0.54
0.66
1.08
1.32
-
80
-
15
-
Maximum Duty Cycle
85
%
Soft Start Period
6.5
15
-
ms
Boost Switch Rise Time(9)
Boost Switch Fall Time(9)
tTR
-
-
ns
tF
-
25
-
ns
Notes
10. Guaranteed by design
34844
Analog Integrated Circuit Device Data
Freescale Semiconductor
9
FREESCALE [ Freescale ]
