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Part Name
Description
L5970D(2003) View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
L5970D
(Rev.:2003)
UP TO 1A STEP DOWN SWITCHING REGULATOR
STMicroelectronics
L5970D Datasheet PDF : 10 Pages
1
2
3
4
5
6
7
8
9
10
L5970D
Figure 10. Demoboard schematic
VREF
3.3V
6
1
VIN = 4.4V to 25V
VCC
8
L5970D
SYNC. 2
C1
10
µ
F
25V
CERAMIC
COMP
C4
22nF
4
3
INH.
C3
220pF
R3
4.7K
5
7
GND
OUT
L1 33
µ
H
VOUT=3.3V
D1
STPS2L25U
R1
FB
5.6K
C2
100
µ
F
10V
R2
3.3K
D03IN1437
Part list demoboard
Reference
C1
C2
C3
C4
R1
R2
R3
D1
L1
Part Number
POSCAP 10TPB100M
C1206C221J5GAC
C1206C223K5RAC
STPS2L25U
DO3316P-333
Figure 11. Efficiency vs. Output Current
Description
10
µ
F, 25V
100
µ
F, 10V
220pF, 5%, 50V
22nF, 10%, 50V
5.6K, 1%, 0.1W 0603
3.3K, 1%, 0.1W 0603
4.7K, 1%, 0.1W 0603
2A, 25V
33
µ
H, 2A
Manufacturer
TOKIN
Sanyo
KEMET
KEMET
Neohm
Neohm
Neohm
STMicroelectronics
COILCRAFT
Figure 12. Efficiency vs. Output Current
94
92
90
Vo=3.3V
88
86
84
Vo=2.5V
82
80
78
Vo=1.8V
76
74
Vcc=5V
72
70
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Io (A)
92
90
Vo=5V
88
86
Vo=3.3V
84
82
80
78
Vo=2.5V
76
74
Vcc=12V
72
70
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Io (A)
6/10
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