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MAX1917 数据表(PDF) 6 Page - Maxim Integrated Products

部件名 MAX1917
功能描述  Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies
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制造商  MAXIM [Maxim Integrated Products]
网页  https://www.maximintegrated.com/en.html
标志 MAXIM - Maxim Integrated Products

MAX1917 数据表(HTML) 6 Page - Maxim Integrated Products

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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.
Tracking, Sinking and Sourcing, Synchronous Buck
Controller for DDR Memory and Termination Supplies
6
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 12V, VEN/HSD = VDDR = 2.5V, CVL = 4.7µF, CVTTR = 1µF, CREF = 0.22µF, VFSEL = 0, ILIM = VL, PGND = LX = POK = GND,
BST = VL. Specifications are for TA = -40°C to +85°C, unless otherwise specified.) (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Upper VTTR Threshold
110
114
%VDDR
/2
Lower VTTR Threshold
86
90
%VDDR
/2
POK Output Low Level
ISINK = 2mA
0.4
V
POK Output High Leakage
VPOK = 5.5V
5
µA
100
50
0.1
1.0
10.0
EFFICIENCY vs. LOAD CURRENT
AT 1.25V OUTPUT
60
55
LOAD CURRENT (A)
70
65
80
85
75
90
95
VIN = 5V
VIN = 2V
VIN = 2.5V
CIRCUIT OF FIGURE 3
96
76
0.1
1.0
10.0
EFFICIENCY vs. LOAD CURRENT
AT 0.9V OUTPUT
80
78
LOAD CURRENT (A)
84
82
88
90
86
92
94
VIN = 5V
VIN = 2.5V
CIRCUIT OF FIGURE 3
100
0
0.1
1.0
10.0
EFFICIENCY vs. LOAD CURRENT
AT 1.25V OUTPUT
20
10
LOAD CURRENT (A)
40
30
60
70
50
80
90
VIN = 12V
VIN = 2.5V
CIRCUIT OF FIGURE 4
VIN = 5V
95
0.1
1.0
10.0
EFFICIENCY vs. LOAD CURRENT
AT 0.9V OUTPUT
55
50
LOAD CURRENT (A)
65
60
75
80
70
85
90
CIRCUIT OF FIGURE 4
VIN = 5V
VIN = 2.5V
300
350
450
400
550
600
500
650
-8
-4
-2
-6
02468
FREQUENCY vs. LOAD CURRENT
AT 1.25V OUTPUT
LOAD CURRENT (A)
VIN = 12V
CIRCUIT OF FIGURE 3
VIN = 5V
VIN = 2.5V
300
450
400
350
600
550
500
650
-8
-2
0
-6
-4
2468
FREQUENCY vs. LOAD CURRENT
AT 0.9V OUTPUT
LOAD CURRENT (A)
CIRCUIT OF FIGURE 3
VIN = 5V
VIN = 2.5V
Typical Operating Characteristics
(V+ = 12V, VOUT = 1.25V, TA = +25°C, unless otherwise noted.)


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