Rainbow Electronics MAX8668 - Manual (Page 7)

MAX8667/MAX8668
Typical Operating Characteristics (continued)
(V IN12 = V IN34 = 3.6V, circuit of Figure 4, V OUT1 = 1.2V, V OUT2 = 1.8V, V OUT3 = 2.8V, V OUT4 = 2.8V, T A = +25°C, unless otherwise noted.)
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
_______________________________________________________________________________________ 7
1ms/div
OUT3 NOISE
MAX8667/88 toc25
100 μV/div
V OUT3 = 2.80V
I LOAD = 100 Ω
1ms/div
OUT4 NOISE
MAX8667/88 toc26
100 μV/div
V OUT4 = 3.30V
I
LOAD
= 100 Ω
400ns/div
OUT2 HEAVY-LOAD SWITCHING
WAVEFORMS
V
OUT2
V LX2
I L2
20mV/div
MAX8667/88 toc23
2V/div
500mA/div
500mA LOAD
0
20
10
40
30
60
50
70
0.01 1 0.1 10 100 1000
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8667/88 toc24
FREQUENCY (kHz)
PSRR (dB)
V OUT3 = 2.80V
I LOAD = 100 Ω
C OUT3 = 4.7 μF