Typical operating characteristics (continued) – Rainbow Electronics MAX8562 User Manual
Page 4
MAX8560/MAX8561/MAX8562
4MHz, 500mA Synchronous Step-Down
DC-DC Converters in SOT and TDFN
4
_______________________________________________________________________________________
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 1.2V)
MAX8560 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
1
50
60
70
80
90
100
40
0.1
1000
4.7
µH
2.2
µH
1
µH
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 0.9V)
MAX8560 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
100
10
1
50
60
70
80
90
100
40
0.1
1000
4.7
µH
2.2
µH
1
µH
EFFICIENCY vs. LOAD CURRENT
(LOAD = 7.5
Ω)
MAX8560 toc06
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
2.0
1.5
1.0
50
60
70
80
90
100
40
0.5
2.5
4.7
µH
2.2
µH
1
µH
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8560 toc07
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
5.0
4.5
2.5
3.0
3.5
4.0
40
41
42
43
44
45
46
47
39
2.0
5.5
R1 = R2 = 100k
Ω
SWITCHING FREQUENCY
vs. LOAD CURRENT
MAX8560 toc08
LOAD CURRENT (mA)
FREQUENCY (MHz)
100
200
300
400
1
10
0.1
0
500
4.7
µH
2.2
µH
1
µH
OUTPUT VOLTAGE vs. LOAD CURRENT
(VOLTAGE POSITIONING)
MAX8560 toc09
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
400
300
100
200
1.17
1.18
1.19
1.20
1.21
1.22
1.23
1.24
1.16
0
500
R1 = R2 = 100k
Ω
LIGHT-LOAD SWITCHING WAVEFORMS
MAX8560 toc10
200ns/div
I
L
200mA/div
V
LX
2V/div
V
OUT
20mV/div
0
50mA LOAD
HEAVY-LOAD SWITCHING WAVEFORMS
MAX8560 toc11
200ns/div
I
L
200mA/div
V
LX
2V/div
V
OUT
20mV/div
0
200mA LOAD
Typical Operating Characteristics (continued)
(V
IN
= 3.6V, V
OUT
= 1.2V, L = 1µH (LQH32C-IRO), C
OUT
= 2.2µF, T
A
= +25°C, unless otherwise noted.)