MPQ8632 HIGH EFFICIENCY 18V SYNCHRONOUS STEP-DOWN CONVERTER FAMILY FOR 4A TO 20A
R3
VIN
BST
IN
0
C3
C1A
C1B
C1C C1D
R7
0.1uF
L1
R5
2.2uH, TOKO FDA1254-2R2M
10uF 10uF
0.1uF 0.1uF
715K
SW
VOUT
100K
FREQ
C4
C2A
C2B
R4
C2C C2D
C2E
R1
47uF 47uF 47uF
0.1uF 0.1uF
330K
330pF
R9
20.5K
EN
MPQ8632
100
FB
SS
VCC
R2
C5
R6
1uF
20K
100K
C6
33nF
PG
AGND
PGND
Figure 25 — Typical Application Circuit with Low ESR Ceramic Capacitor
MPQ8632-10, VIN=12V, VOUT=1.2V, IOUT=10A, FSW=300kHz
Figure 26 — Efficiency Curve
MPQ8632-10, VOUT=1.2V, IOUT=0.01A-10A, FSW=300kHz
R3
VIN
BST
IN
0
C3
C1A
C1B
C1C C1D
R7
0.1uF
L1
R5
1uH, TOKO FDU1250C-1R0M
10uF 10uF
0.1uF 0.1uF
432K
SW
VOUT
100K
FREQ
C4
C2A
C2B
R4
C2C C2D
C2E
R1
47uF 47uF 47uF
0.1uF 0.1uF
220K
330pF
R9
10K
EN
MPQ8632
100
FB
SS
VCC
R2
C5
R6
1uF
10K
100K
C6
33nF
PG
AGND
PGND
Figure 27 — Typical Application Circuit with Low ESR Ceramic Capacitor
MPQ8632-10, VIN=12V, VOUT=1.2V, IOUT=10A, FSW=500kHz
MPQ8632 Rev.1.24
8/28/2013
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33
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