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