ISL6227 Datasheet, PDF (12/27 Pages) Intersil Corporation – Dual Mobile-Friendly PWM Controller with DDR Option

ISL6227
V_IN
VCC (5V)
V1 (2.5V)
Rfb11
17.8k
Cfb1
0.01µF
Cin1
10 µF
Lo1
4.7µH
Co11 Co12
220 µF 4.7µF
Cdc
4.7µF
D1
BAT54W
VIN VCC
GND
DDR
Cbt1
0.15µF
Rbt1 ^BOOT1
0Ω
UGATE1
BOOT2
UGATE2
PHASE1 PHASE2
Q1
Rs1
2.0k
ISEN1
ISEN2
LGATE1 LGATE2
FDS6912A
PGND1
VOUT1
PGND2
VOUT2
VSEN1
VSEN2
Rfb12
10k
PG1
EN1
PG2
U1 _EN2
Rbt2
0Ω
Rs2
2.0k
D2
BAT54W
Cbt2
0.15µF
Q2
Cin2
10µF
Lo2
4.7µH
V2 (1.8V)
FDS6912A
Co21 Co22
220 µF 4.7µF
Rfb21
10k
Cfb2
0.01µF
Rfb22
10k
SOFT1
SOFT2
Csoft1
0.01 µF
OCSET1 OCSET2
Rset1
100k
ISL6227
Rset2
100k
Csoft2
0.01µF
FIGURE 31. TYPICAL APPLICATION CIRCUIT AS DUAL SWITCHER, VOUT1 = 2.5V, VOUT = 1.8V
Vin
VDDQ (2.5V)
Rfb1
17.8k
Cfb1
0.01µF
Cin1
10µF
Lo1
4.6 µH
Co13 ^Co11
220µF ^4.7µF
Rfb12
10K
VCC (5V)
D1
BAT54W
Cbt1
0.15µF
Cdc
4.7µ F
GND ^VIN
Rbt1
BOOT1
0Ω
UGATE1
VCC
DDR
BOOT2
UGATE2
PHASE1 PHASE2
Q1
Rs1 _ISEN1
ISEN2
2.0k
LGATE1 LGATE2
FDS6912A
PGND1
VOUT1
PGND2
VSEN2
Rbt2
0Ω
Rs2
1.0k
D2
BAT54W VDDQ
Cbt2
0.15µF
Cin2
4.7µF
Lo2
Q2 1.5µH
Co21
220µF
FDS6912A
VTT (1.25V)
Co22
4.7µF
VSEN1 PG2_REF
PG1
EN1
SOFT1
VOUT2
U1 _EN2
OCSET2_VDDQ/2
Vref (VDDQ/2)
Cref
4.7µF
VDDQ
Rd1
10k
VDDQ/2
Csoft1
0.01µF
OCSET1
SOFT2
Rset1
100k
ISL6227
Cf
Rd2
0.1µF
10k
Csoft2 (N/U)
0.01µF
FIGURE 32. TYPICAL APPLICATION AS DDR MEMORY POWER SUPPLY, VDDQ = 2.5V, VTT = 1.25V
12
FN9094.7
May 4, 2009