LTC1504A
W
BLOCK DIAGRAM
TO INTERNAL BLOCKS
V
CC
SHDN
Q1
SAW
–
PWM
SW
COMP
SS
+
Q2
12µA
I
FB
LIM
–
+
+
–
I
MAX
FB
(ADJ ONLY)
12µA
20.4k
12.6k
SENSE
(–3.3V ONLY)
V
REF
+
–
1.265V
1504A • BD
Figure 3. Block Diagram
TEST CIRCUITS
NC
L
47µH
EXT
LTC1504A
I
SHDN
SW
MAX
V
OUT
V
CC
V
CC
A
B
FB/SENSE
+
–
C
100µF
IN
LTC1504A
1µF
COMP
GND
SS
FB/SENSE
COMP
+
C
220µF
OUT
+
V
REF
0.1µF
7.5k
0.01µF
220pF
A: TEST V , I
OL OL
C : AVX TPSE107M016R0125
IN
1504A • TC02
B: TEST V , I
OH OH
C : SANYO 16CV220GX
OUT
L : COILCRAFT D03316-473
EXT
1504A • TC01
Figure 1
Figure 2
U
W U U
APPLICATIONS INFORMATION
OVERVIEW
count. The internal switches are set up as a synchronous
buck converter with a P-channel device (Q1) from the
input supply to the switching node and an N-channel
device (Q2) as the synchronous rectifier device from the
switching node to ground. An external inductor, input and
The LTC1504A is a complete synchronous switching
regulator controller (see Block Diagram). It includes two
on-chip 1.3Ω power MOSFETs, eliminating the need for
external power devices and minimizing external parts
5
Linear [ Linear ]
