Rainbow Electronics MAX887 - Manual (Page 5)

MAX887
100% Duty Cycle, Low-Noise,
Step-Down, PWM DC-DC Converter
_______________________________________________________________________________________ 5
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 2, T
A
= +25°C, unless otherwise noted.)
V IN = 5V, V OUT = 3.3V, LOAD = 500mA
A: LX, 5V/div
B: V
OUT , 20mV/div, AC COUPLED
C: INDUCTOR CURRENT, 500mA/div
1 µ s/div
HEAVY-LOAD, PWM-MODE
SWITCHING WAVEFORMS
A
B
C
0mA
MAX887-12
V IN = 5V, V OUT = 3.3V, LOAD = 0mA
A: LX, 5V/div
B: V
OUT
, 20mV/div, AC COUPLED
C: INDUCTOR CURRENT, 500mA/div
1 µ s/div
LIGHT-LOAD, PWM-MODE
SWITCHING WAVEFORMS
A
B
C
MAX887-13
V IN = 5V, V OUT = 3.3V, LOAD = 0mA
A: LX, 5V/div
B: V
OUT , 20mV/div, AC COUPLED
C: INDUCTOR CURRENT, 200mA/div
1 µ s/div
LIGHT-LOAD, PFM-MODE
SWITCHING WAVEFORMS
A
B
C
MAX887-14
V IN = 5V, V OUT = 3.3V, LOAD = 70mA
A: LX, 5V/div
B: V
OUT , 20mV/div, AC COUPLED
C: INDUCTOR CURRENT, 200mA/div
10 µ s/div
MEDIUM-LOAD, PFM-MODE
SWITCHING WAVEFORMS
A
B
C
MAX887-15