ISL6227
V
VCC (5V)
IN
Cdc
4.7µF
D1
BAT54W
BAT54W
VCC
VIN
D2
Rbt2
GND
DDR
Cin1
10
Cbt2
0.15µF
Cbt1
0.15µF
Rbt1
BOOT1
BOOT2
F
µ
Cin2
10µ F
0 Ω
0 Ω
UGATE1
PHASE1
UGATE2
PHASE2
Lo1
4.7µ
Lo2
V2 (1.8V)
V1 (2.5V)
Q1
H
Q2
4.7µ
H
Rs2
Rs1
2.0K
Rfb11
17.8k
ISEN1
ISEN2
LGATE2
PGND2
VOUT2
VSEN2
2.0K
Co11
220µF 4.7µ
Co12
Co21
Co22
4.7
LGATE1
PGND1
VOUT1
VSEN1
F
Cfb2
220
µF
µF
Cfb1
0.01µF
0.01µF
FDS6912A
FDS6912A
Rfb21
10k
Rfb22
10k
PG1
PG2
EN2
Rfb12
10k
U1
EN1
SOFT1
SOFT2
OCSET2
OCSET1
Csoft2
0.01µF
Csoft1
0.01
F
µ
Rset2
100k
Rset1
100k
ISL6227
FIGURE 31. TYPICAL APPLICATION CIRCUIT AS DUAL SWITCHER, VOUT1=2.5V, VOUT2=1.8V
Vin
VCC (5V)
Cdc
4.7µF
D1
D2
VDDQ
BAT54W
BAT54W
VIN
VCC
GND
DDR
Cbt2
Cin1
10µF
Cbt1
Rbt1
Rbt2
Cin2
0.15µF
Q2
0.15µF
BOOT1
BOOT2
4.7µF
0 Ω
0Ω
UGATE1
PHASE1
UGATE2
PHASE2
Lo1
4.6µH
Lo2
1.5µH
Co21
VTT (1.25V)
VDDQ (2.5V)
Q1
Rs2
Rs1
2.0K
Rfb1
ISEN1
ISEN2
1.0K
17.8k
Co11
Co22
4.7µF
Co13
LGATE1
PGND1
VOUT1
VSEN1
LGATE2
PGND2
220µF
4.7
F
µ
µ
220
F
Cfb1
0.01µF
FDS6912A
FDS6912A
VSEN2
Vref (VDDQ/2)
PG2_REF
Cref
4.7µF
VDDQ
VOUT2
PG1
Rfb12
10K
Rd1
10K
U1
EN1
EN2
OCSET2_VDDQ/2
SOFT1
VDDQ/2
Cf
0.1µF
Rd2
10K
OCSET1
SOFT2
Csoft1
0.01µF
Csoft2 (N/U)
0.01µF
Rset1
100K
ISL6227
FIGURE 32. TYPICAL APPLICATION AS DDR MEMORY POWER SUPPLY, VDDQ=2.5V, VTT=1.25V
12
INTERSIL [ Intersil ]
