SM8121A
V
DD
=
3.6V, V
SS
= 0V unless otherwise noted
1200
100
1000
900
Switching frequency (f
osc
) [kHz]
Maximum duty (Duty) [%]
1000
800
600
400
200
0
−50 −25
Soft-start time (T
SS
) [µs]
90
80
70
60
50
40
30
20
10
0
−50 −25
800
700
600
500
400
300
200
100
0
−50 −25
0
25
50
75
100
0
25
50
75
100
0
25
50
75
100
Operating temperature (T
opr
) [°C]
Operating temperature (T
opr
) [°C]
Operating temperature (T
opr
) [°C]
T
opr
vs. f
OSC
10
2.5
T
opr
vs. Duty
3500
Standby current (I
STB
) [pA]
3000
2500
2000
1500
1000
500
0
T
opr
vs. T
SS
CE pin input current (I
CE
) [µA]
9
8
7
6
5
4
3
2
1
0
−50 −25
0
25
50
75
100
CE pin input voltage (V
TH
) [V]
2.0
1.5
1.0
0.5
0.0
−50 −25
0
25
50
75
100
Operating temperature (T
opr
) [°C]
−50 −25
0
25
50
75
100
Operating temperature (T
opr
) [°C]
Operating temperature (T
opr
) [°C]
T
opr
vs. I
CE
(V
CE
=
V
DD
)
500
800
700
600
500
400
300
200
100
0
0
25
50
75
100
T
opr
vs. V
TH
T
opr
vs. I
STB
(V
CE
=
0V)
500
450
400
350
300
250
200
150
100
50
0
−50
−50 −25
400
300
200
100
0
−50 −25
−50 −25
0
25
50
75
100
FB pin input current (I
FB
) [pA]
Quiescent current (I
DD
) [µA]
Quiescent current (I
DD
) [µA]
0
25
50
75
100
Operating temperature (T
opr
) [°C]
Operating temperature (T
opr
) [°C]
Operating temperature (T
opr
) [°C]
T
opr
vs. I
DD
(V
FB
=
1.0V)
0.520
0.515
FB voltage (V
FB
) [V]
0.510
0.505
0.500
0.495
0.490
0.485
0.480
−50 −25
0
25
50
75
100
SW-Tr ON resister (R
ON
) [Ω]
T
opr
vs. I
DD
(V
FB
=
0V)
5
SW-Tr leak current (I
LEAK
) [pA]
−50 −25
4
3
2
1
0
0
25
50
75
100
Operating temperature (T
opr
) [°C]
T
opr
vs. I
FB
(V
FB
=
0.5V)
2000
1750
1500
1250
1000
750
500
250
0
−50 −25
0
25
50
75
100
Operating temperature (T
opr
) [°C]
Operating temperature (T
opr
) [°C]
T
opr
vs. V
FB
T
opr
vs. R
ON
T
opr
vs. I
LEAK
NIPPON PRECISION CIRCUITS INC.—6
NPC [ NIPPON PRECISION CIRCUITS INC ]
