Rainbow Electronics MAX773 - Manual (Page 6)

MAX770–MAX773
5V/12V/15V or Adjustable, High-Efficiency,
Low I
Q , Step-Up DC-DC Controllers
6 _______________________________________________________________________________________
V IN = 2.9V, I OUT = 0.9A
A: EXT VOLTAGE, 5V/div
B: INDUCTOR CURRENT 1A/div
C: V
OUT RIPPLE 100mV/div, AC-COUPLED
MAX770
HEAVY-LOAD SWITCHNG WAVEFORMS
20 µ s/div
V OUT
0 A
I LIM
I LIM
2 B
C
0
V+ = 3V, I
OUT
= 165mA
A: EXT VOLTAGE, 5V/div
B: INDUCTOR CURRENT, 1A/div
C: V
OUT RIPPLE 100mV/div, AC-COUPLED
MAX770
LIGHT-LOAD SWITCHING WAVEFORMS
20 µ s/div
0
B
A
C
ILIM
2
I OUT = 0.7A
A: V IN , 2.7V TO 4.5V, 2V/div
B: V OUT RIPPLE, 100mV/div, AC-COUPLED
MAX770
LINE-TRANSIENT RESPONSE
A
B
4.5V
2.7V
0
2ms/div
V IN = 3V
A: LOAD CURRENT 0.5A/div (0A to 1A)
B: V
OUT
RIPPLE, 100mV/div, AC-COUPLED
MAX770
LOAD-TRANSIENT RESPONSE
2ms/div
A
B
0
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2a, T A = +25°C, unless otherwise noted.)