Rainbow Electronics MAX1775 - Manual (Page 8)

MAX1775
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
8 _______________________________________________________________________________________
5V
3.3V
CORE LINE-TRANSIENT RESPONSE
(3.3V TO 5V)
MAX1775 toc10
100 µs/div
V INC
V CORE
50mV/div
1V/div
1A
0
MAIN LOAD TRANSIENT
(LOAD FROM 100mA to 1A, V IN = 5V)
MAX1775 toc11
200 µs/div
I MAIN
V MAIN
50mV/div
100mA
400mA
MAIN LOAD TRANSIENT (IN DROPOUT
LOAD FROM 50mA TO 500mA)
MAX1775 toc12
200 µs/div
V MAIN
50mV/div
200mA
0
I MAIN
TURN-ON RESPONSE
(CIRCUIT OF FIGURE 4), NO LOAD
MAX1775 toc13
100 µs/div
200mA
0
1V
V CORE
2V
3V
V MAIN
5V
400mA
0mA
I IN
0
SHDNM
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V MAIN = +3.3V, V CORE = +1.8V, T A = +25°C, unless otherwise noted.)