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L4978 Datasheet(PDF) 5 Page - STMicroelectronics

Part # L4978
Description  2A STEP DOWN SWITCHING REGULATOR
PDF  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4978 Datasheet(HTML) 5 Page - STMicroelectronics

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D98IN834A
5
2
8
4
1
L4978
C1
220
µF
63V
C8
330
µF
VO=3.3V/2A
Vi=8V to 55V
R1
20K
C2
2.7nF
R2
9.1K
C4
22nF
3
7
L1
126
µH
(77120)
6
D1
GI
SB560
C5
100nF
C7
220nF
C6
100nF
R3
R4
C1=220
µF/63V EKE
C2=2.7nF
C5=100nF
C6=100nF
C7=220nF/63V
C8=330
µF/35V CG Sanyo
L1=126
µH KoolMu 77120 - 55 Turns - 0.5mm
R1=20K
R2=9.1K
D1=GI SB560
VO(V)
R3(K
Ω)
R4(K
Ω)
3.3
5.1
12
15
18
24
0
2.7
12
16
20
30
4.7
4.7
4.7
4.7
4.7
L4978
Figure 1. Test and evaluation board circuit.
Figure 2. PCB and component layout of the figure 1.
L4978
5/12



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