Rainbow Electronics MAX849 - Manual (Page 6)

MAX848/MAX849
1-Cell to 3-Cell, High-Power,
Low-Noise, Step-Up DC-DC Converters
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(T A = +25°C, unless otherwise noted.)
V IN = 1.1V, I OUT = 200mA, V OUT = 3.3V
A = LX VOLTAGE, 2V/div
B = INDUCTOR CURRENT, 0.5A/div
C = V
OUT RIPPLE, 50mV/div, AC COUPLED
HEAVY-LOAD SWITCHING WAVEFORMS
(V OUT = 3.3V)
A
B
C
0A
0V
V OUT
1 µ s/div
MAX848/9 TOC-10
V IN = 1.1V, V OUT = 3.3V
A = LOAD CURRENT, 0mA TO 200mA, 0.2A/div
B = V
OUT RIPPLE, 50mV/div, AC COUPLED
LOAD-TRANSIENT RESPONSE
A
B
0A
200mA
2ms/div
MAX848/9 TOC-12
I OUT = 0mA, V OUT = 3.3V
A = V IN , 1.1V TO 2.1V, 1V/div
B = V OUT RIPPLE, 50mV/div, AC COUPLED
LINE-TRANSIENT RESPONSE
A
B
0V
5ms/div
MAX848/9 TOC-11
A = V ON1 , 2V/div
B = V OUT , 1V/div
C = INPUT CURRENT, 0.2A/div
POWER-ON DELAY
(PFM MODE)
A
B
C
0mA
3.3V
5ms/div
MAX848/9 TOC-13