Datasheet

LM27x7
HG
BOOT
ISEN
LG
PGND
FB
Vcc
SD
PWGD
FREQ
SS
SGND
EAO
PGND
+
+
Vin = 5V
Vo = 1.2V@10A
3 x 5600 uF
10V, 3.1A
18 m:
1.5 uH
15 A, 4 m:
Rfb2
Rfb1
Cc1
Cc2 Rc1
Rcs
Css
Rfadj
Rin
Cin
D1
Cboot
Q1
Q2
1.2 uH
8.2 A, 6.9 m:
0.1u
1.5k
10
2.2u
88.7k
12n
270p
4.7p
229k
4.99k
4.99k
Co1-3
Lin
L1
2 x 5600uF
10V, 2.35A
Cin1,2
2x1uF
10V
Cinx1, 2
LM27x7
HG
BOOT
ISEN
LG
PGND
FB
Vcc
SD
PWGD
FREQ
SS
SGND
EAO
PGND
+
+
+5V
Vin = 12V
Vo = 3.3V@10A
2 x 10 uF
25V, 3.3A
4 x 100 uF
10V, 55 m:
2.7 uH
14.4 A, 4.5 m:
Rfb2
Rfb1
Cc1
Cc2 Rc1
Rcs
Css
Rfadj
Rin
Cin
D1
Cboot
Q1
Q2
1uF
25V
1.2 uH
8.2 A, 6.9 m:
Rc2 Cc3
0.1u
1.8k
10
2.2u
88.7k
12n
270p
6.8p
143.3k
8.45k 470p
11k
49.9k
Cin1,2
Cinx
Co1-4
Lin
L1
LM2727, LM2737
SNVS205D –AUGUST 2002–REVISED MARCH 2013 www.ti.com
Example Circuits
Figure 25. 5V-16V to 3.3V, 10A, 300kHz
This circuit and the one featured on the front page have been designed to deliver high current and high efficiency
in a small package, both in area and in height The tallest component in this circuit is the inductor L1, which is
6mm tall. The compensation has been designed to tolerate input voltages from 5 to 16V.
Figure 26. 5V to 1.2V, 10A, 300kHz
This circuit design, detailed in the Design Considerations section, uses inexpensive aluminum capacitors and off-
the-shelf inductors. It can deliver 10A at better than 85% efficiency. Large bulk capacitance on input and output
ensure stable operation.
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Product Folder Links: LM2727 LM2737