MPQ28261 – 21V, 3A, 500kHz SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL APPLICATIONS
U1
U1
U1
R5
20
VIN
1
6
IN
BST
SW
VIN
C1B
C1A
L1
L1
L1
C3
SW
MPQ28261
1.0V/3A
1.2V/3A
3.3V/3A
VCC
2,3,4,5
SW
VOUT
C2C
11
VCC
VCC
VOUT
GND
C2A
C2A
C2A
C2B
C2B
C2B
C6
C4
R6
R4
15pF
0
100k
GND
EN
FB
FB
FB
EN
EN
EN
FB
8
7
9
EN
PG
FB
SS
C5
NS
R8
24k
R1
10k
R7
51
R3
20k
R9
100k
10
R2
15k
C7
PG
SS
47nF
PG
SS
Figure 7: VOUT = 1V
R5
20
VIN
1
6
IN
BST
VIN
C1B
C4
C1A
C3
SW
MPQ28261
VCC
2,3,4,5
SW
VOUT
C2C
11
VCC
SW
VCC
VOUT
GND
C6
15pF
R6
0
R4
100k
GND
EN
FB
8
7
9
EN
PG
FB
SS
C5
NS
R8
24k
R1
10k
R7
51
R3
20k
R9
100k
10
R2
10k
C7
PG
SS
47nF
PG
SS
Figure 8: VOUT = 1.2V
R5
20
VIN
1
6
IN
BST
VIN
C1B
C4
C1A
C3
SW
MPQ28261
VCC
2,3,4,5
SW
VOUT
C2C
11
VCC
SW
VCC
VOUT
GND
C6
15pF
R6
0
R4
100k
GND
EN
FB
8
7
9
EN
PG
FB
SS
C5
NS
R8
24k
R1
10k
R7
51
R3
20k
R9
10
100k
R2
2.2k
C7
47nF
PG
SS
PG
SS
Figure 9: VOUT = 3.3V
MPQ28261 Rev. 1.12
10/10/2013
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17
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