Datasheet

MAX1970/MAX1971/MAX1972
Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-
Down Regulator with POR and RSI/PFO
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
CC
= V
EN
= 5V, V
FB1
= V
FB2
= 1.15V, R
POR
= 100kΩ to IN, R
PFO
= 100kΩ to IN, RSI = 0, C
VCC
= 0.1µF, C
REF
= 0.1µF,
FBSEL1 = unconnected, FBSEL2 = unconnected, T
A
= -40°C to +85°C.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
PFO (MAX1970 and MAX1972 Only)
V
CC
rising 4.12
PFO Trip Threshold IN = V
CC
V
CC
falling 3.86
V
PFO Output Current, High PFO = IN -1 1 µA
PFO Output Voltage, Low I
PFO
= 1mA, V
IN
= 4.3V 0.05 V
EN AND RSI (MAX1971 Only)
V
IL
0.4
Logic Input Thresholds IN = 2.6V to 5.5V
V
IH
1.6
V
RSI Input Resistance Internal pullup resistor to IN 5 20 kΩ
V
IL
-1 1
EN Logic Input Current
Logic Input at 0 or
5.5V, V
IN
= 5.5V
V
IH
-1 1
µA
Note 1: See the Output Voltage Selection section.
Note 2: Specifications to T
A
= -40°C are guaranteed by design and not production tested.