Datasheet

MAX1809
3A, 1MHz, DDR Memory Termination Supply
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V
IN
= V
CC
= 3.3V, V
EXTREF
= 1.1V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 4)
Note 2: The output voltage will have a DC-regulation level lower than the feedback error comparator threshold by 50% of the ripple.
Note 3: Recommended operating frequency, not production tested.
Note 4: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
CC
= 3.3V, V
EXTREF
= 1.1V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SS Source Current I
SS
4 5 6 µA
SS Sink Current I
SS
V
SS
= 1V 1 50 mA
SHDN Input Current V
SHDN
= 0, V
CC
-1 +1 µA
V
IL
0.8
SHDN Logic Levels
V
IH
2
V
Maximum Output RMS Current I
OUT
(
RMS
)
3.1 A
RMS
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage V
IN
, V
CC
3.0 5.5 V
Feedback Voltage Accuracy
(V
FB
- V
EXTREF
)
V
IN
= V
CC
= 3V to 5.5V, I
LOAD
= 0,
V
EXTREF
= 1.25V
-24 +24 mV
External Reference Voltage
Range
V
EXTREF
V
IN
= V
CC
= 3 V to 5.5V
V
REF
-
0.01V
V
IN
-
1.9V
V
Reference Voltage V
REF
1.067 1.133 V
V
IN
= 4.5V 200
PMOS Switch
On-Resistance
R
PMOS
I
LX
= 0.5A
V
IN
= 3V 250
mΩ
V
IN
= 4.5V 150
NMOS Switch
On-Resistance
R
NMOS
I
LX
= 0.5A
V
IN
= 3V 200
mΩ
Current-Limit Threshold I
LIMIT
V
IN
> V
LX
3.3 4.9 A
FB Input Bias Current I
FB
V
FB
= V
EXTREF
+ 0.1V 300 nA
Off-Time t
OFF
R
TOFF
= 110kΩ 0.85 1.15 µs