Rainbow Electronics MAX8668 - Manual (Page 4)

MAX8667/MAX8668
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
4 _______________________________________________________________________________________
Typical Operating Characteristics
(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.)
OUT1 EFFICIENCY vs. LOAD CURRENT
(V OUT1 = 1.2V)
MAX8667/88 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
10 1
10
20
30
40
50
60
70
80
90
0
0.1 1000 100
ONLY OUT1 ENABLED
OUT2 EFFICIENCY vs. LOAD CURRENT
(V OUT2 = 1.8V)
MAX8667/88 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
1000 100 10 1
10
20
30
40
50
60
70
80
90
0
0.1 10000
ONLY OUT2 ENABLED
0.80
0.90
0.85
1.05
1.00
0.95
1.20
1.15
1.10
1.25
0 200 100 300 400 500 600
OUT1 LOAD REGULATION
MAX8667/88 toc03
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
1.20
1.40
1.30
1.60
1.50
1.80
1.70
1.90
0 400 600 200 800 1000 1200
OUT2 LOAD REGULATION
MAX8667/88 toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
2.5 3.5 3.0 4.0 4.5 5.0 5.5
OUT1 OUTPUT VOLTAGE
vs. INPUT VOLTAGE (600mA LOAD)
MAX8667/88 toc05
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
2.5 3.5 3.0 4.0 4.5 5.0 5.5
OUT2 OUTPUT VOLTAGE
vs. INPUT VOLTAGE (1200mA LOAD)
MAX8667/88 toc06
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
0
1000
500
2000
1500
3000
2500
3500
0 600 900 300 1200 1500 1800
SWITCHING FREQUENCY
vs. LOAD CURRENT
MAX8667/88 toc07
LOAD CURRENT (mA)
SWITCHING FREQUENCY (kHz)
OUT2
OUT1
0
20
40
60
80
100
120
1.5 2.5 2.0 3.0 3.5 4.0 4.5 5.0 5.5
NO-LOAD SUPPLY CURRENT vs. SUPPLY
VOLTAGE ALL REGULATOR ENABLED
MAX8667/88 toc08
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
μ
A)
SUPPLY VOLTAGE
RISING
SUPPLY VOLTAGE
FALLING
0
20
40
60
80
100
120
1.5 2.5 2.0 3.0 3.5 4.0 4.5 5.0 5.5
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE OUT1 AND OUT2 ONLY
MAX8667/88 toc09
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
μ
A)
SUPPLY VOLTAGE
RISING
SUPPLY VOLTAGE
FALLING