参数资料
型号: MAX8632ETI+T
厂商: Maxim Integrated Products
文件页数: 24/29页
文件大小: 0K
描述: IC PWR SUPPLY DDR 28-TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
应用: 控制器,DDR
输入电压: 2 V ~ 28 V
输出数: 1
输出电压: 1.8V,2.5V,0.7 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-WFQFN 裸露焊盘
供应商设备封装: 28-TQFN-EP(5x5)
包装: 带卷 (TR)
Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
R6
20 ?
C1
0.1 μ F
VTT
1.25V / ± 1.5A
C2
10 μ F
C4
20 μ F
VTTI
VTT
VTTS
REFIN
MAX8632
AV DD
R1
10 ?
C3
1 μ F
5V
PGND2
V DD
BIAS
VTTR
1.25V / 10mA
R2
100k ?
R3
100k ?
C6
1 μ F
VTTR
OVP/UVP
V IN
BST
D1
CMDSH-3
C7
0.22 μ F
C5
4.7 μ F
C8
2 x 10 μ F
C14
470 μ F
(OPTIONAL)
SUPPLY
V IN (4.5V TO 28V)
POK1
POK2
POK1
POK2
LX
Q1
IRF7821
SKIP
DH
n-CHANNEL
30V, 9m ?
C9
3.9nF
TON
GND
L1
TOKO FDA1254-1R0M
1.0 μ H, 21A, 1.6m ?
2.5V / 12A
C10
0.22 μ F
SS
REF
DL
Q2
IRF7832
n-CHANNEL
30V,5m ?
C11
150 μ F
C12
150 μ F
C13
1 μ F
R5
47.5k ?
R4
100k ?
ILIM
PGND1
SHDN
C11, C12 (150 μ F, 4V,
25m ? , LOW-ESR POS
ON
CAPACITOR (D2E)
FB
OUT
STBY
TP0
OFF
SANYO 4TPE150M
Figure 8. Typical Application Circuit
L × ? I LOAD ( MAX ) 2 ? OUT
+ t OFF ( MIN ) ?
? ( V IN - V OUT ) × K ?
? ?
Transient Response (Buck)
The inductor ripple current also affects transient-
response performance, especially at low V IN - V OUT dif-
ferentials. Low inductor values allow the inductor
current to slew faster, replenishing charge removed
from the output filter capacitors by a sudden load step.
V SAG =
2 C OUT × V OUT ? + t OFF ( MIN ) ?
? V × K ?
? V IN ?
V IN
The output sag is also a function of the maximum duty
factor, which can be calculated from the on-time and
minimum off-time:
where t OFF(MIN) is the minimum off-time (see the
Electrical Characteristics ) and K is from Table 1.
24
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