Datasheet

MAX1623
_______________________________________________________________________________________ 5
3A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
B
C
A
1ms/div
START-UP AND SHUTDOWN TRANSIENT
MAX1623 TOC08
V
IN
= 5V, V
OUT
= 3.3V, I
LOAD
= 3A,
WAVEFORM AVERAGED
A: V
OUT
, 2V/div
B: I
IN
, 1A/div
C: V
SHDN
, 5V/div
LOAD-TRANSIENT RESPONSE
(FBSEL = REF)
MAX1623 TOC10
I
LOAD
0 to 3A
V
OUT
50mV
AC-COUPLED
f = 300kHz
20µs/div
LINE-TRANSIENT RESPONSE
MAX1623 TOC12
V
IN
= 4.5V
to 5.5V
AC-COUPLED
(1V/div)
V
OUT
= 3.3V
AC-COUPLED
I
OUT
= 1.5A
(20mV/div)
20µs/div
LOAD-TRANSIENT RESPONSE
(FBSEL = REF)
MAX1623 TOC11
I
LOAD
0 to 2A
V
OUT
50mV
AC-COUPLED
f = 300kHz
20µs/div
____________________________ Typical Operating Characteristics (continued)
(Circuit of Figure 2, T
A
= +25°C, unless otherwise noted.)
LINE-TRANSIENT RESPONSE
MAX1623 TOC13
V
IN
= 4.5V
to 5.5V
AC-COUPLED
(1V/div)
V
OUT
= 3.3V
AC-COUPLED
I
OUT
= 100mA
(20mV/div)
20µs/div
B
C
A
1ms/div
START-UP AND SHUTDOWN TRANSIENT
MAX1623 TOC09
V
IN
= 5V, V
OUT
= 3.3V, I
LOAD
= 2A,
WAVEFORM AVERAGED
A: V
OUT
, 2V/div
B: I
IN
, 1A/div
C: V
SHDN
, 5V/div