Datasheet

V
IN
= 5V, 100kΩ PULLUP RESISTOR POK TO V
OUT
MAX1974
STARTUP WAVEFORMS
POK
ON
V
OUT
1V/div
10V/div
0
2V/div
0
0
MAX1973/74 toc08
I
IN
0
200mA/div
MAX1973/MAX1974
Smallest 1A, 1.4MHz Step-Down Regulators
_______________________________________________________________________________________ 7
V
IN
= 5V, V
OUT
= 2.5V, I
OUT
= 800mA
MAX1973
HIGH-CURRENT SWITCHING WAVEFORMS
V
LX
V
OUT
I
L
5V/div
20mV/div
0
MAX1973/74 toc09
0
500mA/div
500ns/div
V
IN
= 5V, V
OUT
= 2.5V, I
OUT
= 10mA
MAX1973
LOW-CURRENT SWITCHING WAVEFORMS
V
LX
V
OUT
I
L
5V/div
20mV/div
0
MAX1973/74 toc10
0
500mA/div
500ns/div
V
IN
= 5V, V
OUT
= 2.5V, I
OUT
= 400mA TO 800mA
MAX1973
LOAD TRANSIENT
V
OUT
I
L
20mV/div
0
MAX1973/74 toc11
500mA/div
500ns/div
V
IN
= 5V, V
OUT
= 2.5V, I
OUT
= 600mA TO 800mA
MAX1973
LOAD TRANSIENT
V
OUT
I
L
200mV/div
0
MAX1973/74 toc12
500mA/div
20µs/div
V
IN
= 3.3V TO 5V TO 3.3V, I
OUT
= 800mA
MAX1973
LINE TRANSIENT
V
OUT
V
IN
50mV/div
0
MAX1973/74 toc13
2V/div
200µs/div
Typical Operating Characteristics (continued)
(Circuits of Figure 2, 3, and 4; T
A
= +25°C, unless otherwise noted.)