Datasheet

MAX1951A
1MHz, 2A, 2.6V to 5.5V Input, PWM DC-DC
Step-Down Regulator with Enable
4 _______________________________________________________________________________________
LOAD REGULATION
MAX1951A toc04
OUTPUT CURRENT (A)
OUTPUT VOLTAGE DEVIATION (%)
1.61.20.80.4
-0.40
-0.30
-0.20
-0.10
0
0.10
0.20
0.30
0.40
0.50
-0.50
02.0
V
OUT
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.5V
LOAD TRANSIENT (50% TRANSIENT)
MAX1951A toc05
V
OUT
(AC-COUPLED)
500mV/div
V
OUT
= 2.5V
I
OUT
1A/div
40Fs/div
LOAD TRANSIENT (90% TRANSIENT)
MAX1951A toc06
V
OUT
(AC-COUPLED)
200mV/div
I
OUT
1A/div
40Fs/div
SOFT-START WAVEFORMS
(V
IN
= 3.3V, V
OUT
= 0.8V)
MAX1951A toc09
V
OUT
500mV/div
EN
2V/div
1ms/div
STARTUP INTO PREBIASED
OUTPUT
MAX1951A toc10
LX
5V/div
V
OUT
2V/div
V
OUT
= 2.5V
V
OUT
= 1.5V
EN
5V/div
1ms/div
SWITCHING WAVEFORMS
(V
IN
= 3.3V, V
OUT
= 1.8V, R
L
= 1I)
MAX1951A toc07
LX
2V/div
V
OUT
(AC-COUPLED)
10mV/div
I
LX
500mA/div
400ns/div
SOFT-START WAVEFORMS
(V
IN
= 3.3V, V
OUT
= 1.8V)
MAX1951A toc08
V
OUT
1V/div
EN
2V/div
1ms/div
Typical Operating Characteristics (continued)
(Typical values are at V
IN
= V
CC
= 5V, V
OUT
= 1.5V, I
OUT
= 1.5A, and T
A
= +25°C, unless otherwise noted. See Figure 2.)