MAX8550 Maxim Integrated Products, MAX8550 Datasheet - Page 24

• Manufacturer Part Number: MAX8550
• Description: (MAX8550 / MAX8551) Integrated DDR Power-Supply Solutions
• Manufacturer: Maxim Integrated Products

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fully enhanced for lowest on-resistance. This minimum
gate-to-source voltage (V
where V
high-side MOSFET, and C
Integrated DDR Power-Supply Solutions for
Desktops, Notebooks, and Graphic Cards
Figure 8. Typical Applications Circuit
24
1.25V / ±1.5A
1.25V / 10mA
POK1
POK2
______________________________________________________________________________________
100kΩ
VTTR
VTT
DD
R2
V
GS MIN
is 5V, Q
(
0.22µF
C10
20kΩ
R3
100kΩ
R5
41.2kΩ
)
10µF
G
C4
60µF
R6
=
3.9nF
C2
C9
C6
1µF
is the total gate charge of the
V
DD
GS(MIN)
R4
187kΩ
BOOST
x
VTTI
VTT
VTTS
PGND2
VTTR
OVP/UVP
POK
SKIP
TON
GND
SS
REF
ILIM
FB
OUT
C
) is determined by:
is the boost-capacitor
BOOST
Q
G
REFIN
MAX8550
PGND1
SHDNA
SHDNB
0.01µF
STBY
AV
C1
V
BST
V
DH
LX
DL
DD
DD
IN
D1
CMOSH-3
R1
10Ω
C7
0.22µF
value where C
Circuit (Figure 8).
The inductor ripple current also affects transient-
response performance, especially at low V
ferentials. Low inductor values allow the inductor
current to slew faster, replenishing charge removed
from the output filter capacitors by a sudden load step.
1µF
C3
ON
Q1
IRF7821
N-CHANNEL
30V, 9mW
2 x 10µF
N-CHANNEL
C5
4.7µF
30V,5mW
TOKO FDA1254-1R0M
C8
IRF7832
1.0µH, 21A,
OFF
Q2
L1
C14
470µF
(OPTIONAL)
BOOST
1.6mΩ
Transient Response (Buck)
is C7 in the Typical Applications
25mW, LOW-ESR POS
C11, C12 (150mF, 4V,
SANYO 4TPE150M
C11
150µF
CAPACITOR (D2E)
5V
BIAS
SUPPLY
V
IN
(4.5V TO 28V)
C12
150µF
IN
- V
C13
1µF
OUT
2.5V / 12A
dif-
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