Datasheet

4.5V to 24V
Input
V
IN
GND
SHUTDOWN
C
IN
33 PF
C
BYP
1 PF
R
T
21 k:
GND
FB
PGATE
ISEN
ADJ
VCC
C
VCC
0.47 PF
C
ADJ
1000 pF
R
ADJ
2.05 k:
R
SEN
0.01:
L1 6.8 PH
Q1
D1
V
OUT
C
OUT
GND
C1
3300 pF
C2
0.1 PF
R3
48.7 k:
1.0V
68 PF
R
FB1
10 k:
R
FB2
1.1 k:
RT
VIN
LM25085A
LM25085A
SNVS601B –JANUARY 2009–REVISED MARCH 2013 www.ti.com
Final Design Example Circuit
The final circuit is shown in Figure 28, and its performance is presented in Figure 29 through Figure 32. The
measured efficiencies shown in Figure 29 are typical for a buck converter producing a low output voltage (1V).
Figure 28. Example Circuit
Figure 29. Efficiency vs. Load Current and V
IN
(Circuit of Figure 28)
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