Tracking, Sinking and Sourcing, Synchronous Buck
Controller for DDR Memory and Termination Supplies
MAX1917
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
= 0°C to +85°C.
Typical values are at T
A
= +25°C, unless otherwise specified.)
PARAMETER
Logic VL Level
EN/HSD LOGIC
EN/HSD Shutdown Current
Logic High
Logic Low
POWER-OK OUTPUT
Upper VTT Threshold
Lower VTT Threshold
Upper VTTR Threshold
Lower VTTR Threshold
POK Output Low Level
POK Output High Leakage
I
SINK
= 2mA
V
POK
= 5.5V
110
86
110
86
112
88
112
88
114
90
114
90
0.4
5
%V
DDR
/
2
%V
DDR
/
2
%V
DDR
/
2
%V
DDR
/
2
V
µA
Max I
EN/HSD
for V
EN/HSD
= 0.8V
VL = V+ = 4.5V to 5.5V, 100mV hysteresis
VL = V+ = 4.5V to 5.5V
0.5
1.45
0.8
3.0
µA
V
V
FSEL = VL
CONDITIONS
MIN
VL - 0.4
TYP
MAX
UNITS
V
ELECTRICAL CHARACTERISTICS
(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
V+ Input Voltage Range
EN/HSD Input Voltage Range
DDR Input Voltage Range
V+ Supply Current
DDR Supply Current
EN/HSD Supply Current
VL Supply Current
V+ Shutdown Supply Current
DDR Shutdown Supply Current
VL Shutdown Supply Current
VL Undervoltage Lockout
Threshold
VTT
VTT Input Bias Current
VTT Feedback Voltage Range
VTT Feedback Voltage
Accuracy
REFERENCE
Reference Output Voltage
Reference Load Regulation
V+ = VL = 4.5V to 5.5V, I
REF
= 0
V+ = VL = 5V, I
REF
= 0 to 50µA
1.98
2.02
10
V
mV
Overload range, V
DDR
= 1.8V
Overload range, V
DDR
= 3.6V
V
VTT
= 2.5V
-0.15
0
49.5
49.5
0
1.8
50.5
50.5
µA
V
%V
DDR
V
EN/HSD
= 2.5V
VL = V+ = 5.5V
EN/HSD = 0V
EN/HSD = 0V
VL = V+ = 5.5V
Rising edge, hysteresis = 40mV
4.05
VTT = 2.0V
VL = V+
Enabled
CONDITIONS
MIN
5.5
4.5
1.5
0
TYP
MAX
14.0
5.5
15.0
3.6
1.2
250
10
1.2
5
1
5
4.40
UNITS
V
V
V
V
mA
µA
µA
mA
µA
µA
µA
V
4
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
