Typical operating characteristics – Rainbow Electronics MAX8640Z User Manual
Page 3
MAX8640Y/MAX8640Z
500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters in SC70
_______________________________________________________________________________________
3
Typical Operating Characteristics
(V
IN
= 3.6V, V
OUT
= 1.5V, MAX8640Z, L = Murata LQH32CN series, T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
1.8V OUTPUT
LOAD CURRENT (mA)
EFFICIENCY (%)
MAX8640Y/Z toc01
0
10
20
30
40
50
60
70
80
90
100
0.1
1
10
100
1000
MAX8640YEXT18
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
μ
A)
MAX8640Y/Z toc02
2.9
3.3
3.7
4.1
4.5
4.9
5
10
15
20
25
30
35
MAX8640ZEXT15
MAX8640YEXT18
SWITCHING FREQUENCY
vs. LOAD CURRENT
LOAD CURRENT (mA)
SWITCHING FREQUENCY (MHz)
MAX8640Y/Z toc03
0
100
200
300
400
500
0.1
1
10
MAX8640ZEXT15
MAX8640YEXT18
OUTPUT VOLTAGE vs. LOAD CURRENT
(VOLTAGE POSITIONING)
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
MAX8640Y/Z toc04
0
100
200
300
400
500
1.30
1.35
1.40
1.45
1.50
1.55
MAX8640ZEXT15
I
LX
V
LX
V
OUT
200mA/div
2V/div
20mV/div
(AC-COUPLED)
10
μs/div
LIGHT-LOAD SWITCHING WAVEFORMS
(I
OUT
= 1mA)
MAX8640Y/Z toc05
I
LX
V
LX
V
OUT
200mA/div
2V/div
0V
0mA
20mV/div
(AC-COUPLED)
200ns/div
MEDIUM-LOAD SWITCHING WAVEFORMS
(I
OUT
= 40mA)
MAX8640Y/Z toc06
I
LX
V
LX
V
OUT
200mA/div
2V/div
0V
0mA
20mV/div
(AC-COUPLED)
200ns/div
HEAVY-LOAD SWITCHING WAVEFORMS
(I
OUT
= 300mA)
MAX8640Y/Z toc07