Datasheet

MAX1970/MAX1971/MAX1972
Dual, 180° Out-of-Phase, 1.4MHz, 750mA Step-
Down Regulator with POR and RSI/PFO
8 _______________________________________________________________________________________
I
OUT1
V
OUT1
40µs/div
MAX1970TOC09
V
IN
= 5V
V
OUT1
= 3.3V, 100mV/div
I
OUT1
= 300mA TO 600mA
R
C1
= 82kΩ, C
C1
= 680pF
LOAD-TRANSIENT RESPONSE
MAX1970/MAX1972
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
I
OUT2
V
OUT2
40µs/div
MAX1970TOC10
V
IN
= 5V
V
OUT2
= 1.5V, 100mV/div
I
OUT2
= 300mA TO 600mA
R
C2
= 39kΩ, C
C2
= 680pF
LOAD-TRANSIENT RESPONSE
MAX1970/MAX1972
V
LX1
I
L2
V
LX2
I
L1
200ns/div
MAX1970TOC11
V
IN
= 5V
V
OUT1
= 1.8V, V
OUT2
= 2.5V
I
OUT1
= 500mA, I
OUT2
= 500mA
SWITCHING WAVEFORMS
MAX1970/MAX1972
5V/div
200mA/div
5V/div
200mA/div
14
0
0.01 0.1 1 10
MAXIMUM OUTPUT TRANSIENT DURATION
vs. POR COMPARATOR OVERDRIVE
2
MAX1970TOC12
MAXIMUM OUTPUT TRANSIENT DURATION (µs)
POR COMPARATOR OVERDRIVE (%)
6
4
8
10
12