參數(shù)資料
型號： MAX1917
廠商： Maxim Integrated Products, Inc.
英文描述： Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies
中文描述： 跟蹤、可吸入/源出電流、同步buck控制器，用于DDR存儲器及端接電源
文件頁數(shù)： 6/18頁
文件大?。?/td> 336K
代理商： MAX1917
Note 1:
On Time and Off Time specifications are measured from 50% point to 50% point at the DH pin with LX forced to 0V, BST
forced to 5V, and a 250pF capacitor connected from DH to LX. Actual in-circuit times may differ due to MOSFET switching
speeds.
Note 2:
Specifications to -40
°
C are guaranteed by design and are not production tested.
M
Tracking, Sinking and Sourcing, Synchronous Buck
Controller for DDR Memory and Termination Supplies
6
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 12V, V
EN/HSD
= V
DDR
= 2.5V, C
VL
= 4.7μF, C
VTTR
= 1μF, C
REF
= 0.22μF, V
FSEL
= 0, ILIM = VL, PGND = LX = POK = GND,
BST = VL. Specifications are for
T
A
= -40
°
C to +85
°
C
, unless otherwise specified.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
%V
DDR
/2
%V
DDR
/2
V
μA
Upper VTTR Threshold
110
114
Lower VTTR Threshold
86
90
POK Output Low Level
POK Output High Leakage
I
SINK
= 2mA
V
POK
= 5.5V
0.4
5
100
50
0.1
1.0
10.0
EFFICIENCY vs. LOAD CURRENT
AT 1.25V OUTPUT
60
55
M
LOAD CURRENT (A)
E
70
65
80
85
75
90
95
V
IN
= 5V
V
IN
= 2V
V
IN
= 2.5V
CIRCUIT OF FIGURE 3
96
76
0.1
1.0
10.0
EFFICIENCY vs. LOAD CURRENT
AT 0.9V OUTPUT
80
78
M
LOAD CURRENT (A)
E
84
82
88
90
86
92
94
V
IN
= 5V
V
IN
= 2.5V
CIRCUIT OF FIGURE 3
100
0
0.1
1.0
10.0
EFFICIENCY vs. LOAD CURRENT
AT 1.25V OUTPUT
20
10
M
LOAD CURRENT (A)
E
40
30
60
70
50
80
90
V
IN
= 12V
V
IN
= 2.5V
CIRCUIT OF FIGURE 4
V
IN
= 5V
95
0.1
1.0
10.0
EFFICIENCY vs. LOAD CURRENT
AT 0.9V OUTPUT
55
50
M
LOAD CURRENT (A)
E
65
60
75
80
70
85
90
CIRCUIT OF FIGURE 4
V
IN
= 5V
V
IN
= 2.5V
300
350
450
400
550
600
500
650
-8
-4
-2
-6
0
2
4
6
8
FREQUENCY vs. LOAD CURRENT
AT 1.25V OUTPUT
M
LOAD CURRENT (A)
F
V
IN
= 12V
CIRCUIT OF FIGURE 3
V
IN
= 5V
V
IN
= 2.5V
300
450
400
350
600
550
500
650
-8
-2
0
-6
-4
2
4
6
8
FREQUENCY vs. LOAD CURRENT
AT 0.9V OUTPUT
M
LOAD CURRENT (A)
F
CIRCUIT OF FIGURE 3
V
IN
= 5V
V
IN
= 2.5V
Typical Operating Characteristics
(V+ = 12V, V
OUT
= 1.25V, T
A
= +25
°
C, unless otherwise noted.)
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