5 V/1 2 V/1 5 V o r Ad ju s t a b le , High-Effic ie nc y,
Low I , Ste p-Up DC-DC Controlle rs
Q
____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(Circuit of Figure 2a, T = +25°C, unless otherwise noted.)
A
MAX770
MAX770
LIGHT-LOAD SWITCHING WAVEFORMS
HEAVY-LOAD SWITCHNG WAVEFORMS
V
OUT
A
0
LIM
A
B
I
I
LIM
I
LIM
2
2
B
C
0
0
C
0–MAX73
20µs/div
20µs/div
V+ = 3V, I = 165mA
V = 2.9V, I = 0.9A
OUT
IN
OUT
A: EXT VOLTAGE, 5V/div
B: INDUCTOR CURRENT, 1A/div
A: EXT VOLTAGE, 5V/div
B: INDUCTOR CURRENT 1A/div
C: V RIPPLE 100mV/div, AC-COUPLED
OUT
C: V RIPPLE 100mV/div, AC-COUPLED
OUT
MAX770
MAX770
LINE-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
A
B
4.5V
2.7V
A
B
0
0
2ms/div
2ms/div
I
= 0.7A
V = 3V
IN
OUT
A: V , 2.7V TO 4.5V, 2V/div
IN
A: LOAD CURRENT 0.5A/div (0A to 1A)
B: V RIPPLE, 100mV/div, AC-COUPLED
OUT
B: V RIPPLE, 100mV/div, AC-COUPLED
OUT
_______________________________________________________________________________________
6
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
