MAX8632ETI+ Maxim Integrated Products, MAX8632ETI+ Datasheet - Page 24

• Manufacturer Part Number: MAX8632ETI+
• Description: IC PWR SUPPLY DDR 28-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8632ETI+

• Applications: Controller, DDR
• Voltage - Input: 2 ~ 28 V
• Number Of Outputs: 1
• Voltage - Output: 1.8V, 2.5V, 0.7 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Output Voltage: 1.8 V or 2.5 V or 0.7 V to 5.5 V
• Output Current: 15 A
• Input Voltage: 2 V to 28 V
• Supply Current: 25 uA
• Switching Frequency: 600 KHz
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
The output sag is also a function of the maximum duty
factor, which can be calculated from the on-time and
minimum off-time:
Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
Figure 8. Typical Application Circuit
24
1.25V / ±1.5A
1.25V / 10mA
POK1
POK2
______________________________________________________________________________________
100kΩ
VTTR
VTT
R2
0.22µF
C10
47.5kΩ
R3
100kΩ
R5
Transient Response (Buck)
10µF
C4
20µF
3.9nF
C2
C9
C6
1µF
R4
100kΩ
POK2
VTTI
VTT
VTTS
PGND2
VTTR
OVP/UVP
POK1
SKIP
TON
GND
SS
REF
ILIM
FB
OUT
20Ω
R6
REFIN
MAX8632
IN
PGND1
- V
0.1µF
SHDN
AV
STBY
C1
V
BST
TP0
V
DH
LX
DL
DD
DD
OUT
IN
dif-
D1
CMDSH-3
R1
10Ω
C7
0.22µF
where t
Electrical Characteristics) and K is from Table 1.
V
1µF
C3
SAG
ON
Q1
IRF7821
n-CHANNEL
30V, 9mΩ
2 x 10µF
n-CHANNEL
C5
4.7µF
=
30V,5mΩ
TOKO FDA1254-1R0M
C8
IRF7832
1.0µH, 21A,
OFF
OFF(MIN)
Q2
2
C
L
OUT
L1
×
C14
470µF
(OPTIONAL)
∆
1.6mΩ
I
×
LOAD MAX
is the minimum off-time (see the
V
OUT
(




(
)
V
2
IN



25mΩ, LOW-ESR POS
V
-
C11, C12 (150µF, 4V,
SANYO 4TPE150M
OUT
CAPACITOR (D2E)
V
C11
150µF
OUT
V
IN
V
IN
5V
BIAS
SUPPLY
V
×
)
IN
(4.5V TO 28V)
×
C12
150µF
K
K
+
+
t
OFF MIN
C13
1µF
t
OFF MIN
(
2.5V / 12A
(
)



)



