XRP7708 Exar Corporation, XRP7708 Datasheet - Page 8

• Manufacturer Part Number: XRP7708
• Description: Quad Channel Digital Pwm Step Down Controller
• Manufacturer: Exar Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at T
this datasheet.
© 2010 Exar Corporation
FET: FDS8984; Inductor:744310200 7x7x3mm
FET: Si4944; Inductor: 744314xxx 7x7x5mm
Fig. 8: Simultaneous Start-up Configuration
300kHz - Channels not in use are disabled
300kHz - Channels not in use are disabled
Fig. 4: 12Vin Efficiency: Single Channel
Fig. 6: 12Vin Efficiency: Single Channel
CH1:3.3V CH2:5V CH3:1V CH4:1.8V
J
= T
A
= 25°C, unless otherwise specified - Schematic and BOM from Application Information section of
Q
Q
u
u
a
a
d
d
C
C
h
h
a
a
n
n
8/27
n
n
e
e
1V @ 8A, 5V & 3V3 - FET: FDS8984; Inductor: 744314490
Fig. 5: 12Vin Combined Efficiency, 5V & 3V3 @ 5A, 1V8 &
7x7x5mm 1V8 & 1V - FETs: SiR466 upper, SiR464 lower;
l
l
D
D
FET: FDS8984; Inductor:744310200 7x7x3mm
i
i
g
g
i
i
1MHz - Channels not in use are disabled
Fig. 7: 12Vin Efficiency: Single Channel
t
t
Inductor: 7443551130 13x13x6.5mm
CH1:3.3V CH2:5V CH3:1V CH4:1.8V
a
a
l
l
Fig. 9: Simultaneous Soft-Stop
P
P
W
W
M
M
S
S
t
t
e
e
p
p
D
D
o
o
w
w
n
n
X
X
C
C
R
R
o
o
n
P
n
P
Rev. 1.0.3
t
t
7
7
r
r
o
7
o
7
l
l
0
0
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l
e
e
8
8
r
r