Datasheet

MAX1830/MAX1831
3A, 1MHz, Low-Voltage, Step-Down Regulators with
Synchronous Rectification and Internal Switches
_______________________________________________________________________________________ 5
0.10
-0.25
0.001 0.01 0.1 1 10
NORMALIZED OUTPUT ERROR
vs. OUTPUT CURRENT
MAX1830 toc04
OUTPUT CURRENT (A)
NORMALIZED OUTPUT ERROR (%)
-0.10
-0.05
0
-0.15
-0.20
0.05
V
IN
= 3.3V
V
OUT
= 1.5V
L = 1.5µH
V
IN
= 5.0V
V
OUT
= 1.5V
L = 1.5µH
0
400
200
800
600
1000
1200
0 1.0 1.50.5 2.0 2.5 3.0
SWITCHING FREQUENCY
vs. OUTPUT CURRENT
MAX1830 toc05
OUTPUT CURRENT (A)
FREQUENCY (kHz)
V
IN
= 3.3V,
V
OUT
= 1.5V, L = 1.5µH
V
IN
= 5.0V,
V
OUT
= 1.5V, L = 1.5µH
400µ
s/div
STARTUP AND SHUTDOWN
V
SHDN
5V/div
I
IN
1A/div
V
OUT
1V/div
MAX1830 toc06
V
IN
= 3.3V, V
OUT
= 1.5V,
R
OUT
= 0.5Ω, R
TOFF
= 82kΩ, L = 1.5µH
LOAD-TRANSIENT RESPONSE
V
OUT
50mV/div
AC-COUPL
E
I
OUT
2A/div
MAX1830 toc07
V
IN
= 3.3V, V
OUT
= 1.5V,
R
TOFF
= 82kΩ, L = 1.5µH, I
OUT
= 0.1A TO 3A
10µ
s/div
0
20
µ
s/div
LINE-TRANSIENT RESPONSE
V
IN
2V/div
V
OUT
50mV/div
AC-COUPLE
D
MAX1830 toc08
V
OUT
= 1.8V, I
OUT
= 1A,
R
TOFF
= 75kΩ, L = 1.5µH
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)