Datasheet

MAX1954A
Low-Cost, Current-Mode PWM Buck
Controller with Foldback Current Limit
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
LOAD TRANSIENT
MAX1954A toc07
40µs/div
100mV/div
V
OUT
AC-COUPLED
I
OUT
5A/µs
5A
2.5A
NO-LOAD SWITCHING WAVEFORMS
MAX1954A toc08
2µs/div
2A/div
I
L
DH
LX
DL
5V/div
10V/div
5V/div
HEAVY-LOAD SWITCHING WAVEFORMS
I
LOAD
= 5A
MAX1954A toc09
2µs/div
2A/div
I
L
DH
LX
DL
5V/div
10V/div
5V/div
SHORT CIRCUIT AND RECOVERY
MAX1954A toc11
200µs/div
1V/div
V
OUT
V
IN
I
LX
5A/div
2V/div
I
IN
2A/div
POWER-UP/POWER-DOWN WAVEFORMS
MAX1954A toc10
4ms/div
5V/div
V
IN
V
OUT
I
LX
5A/div
2V/div
STARTUP INTO PREBIASED OUTPUT
(OUTPUT PREBIASED AT ~1.7V)
MAX1954A toc12
2ms/div
1V/div
V
OUT
V
IN
DL
5V/div
5V/div
DH
5V/div