Typical operating characteristics (continued) – Rainbow Electronics MAX15040 User Manual
Page 5
MAX15040
High-Efficiency, 4A, Step-Down Regulator with
Integrated Switches in 2mm x 2mm Package
_______________________________________________________________________________________
5
EFFICIENCY
vs. OUTPUT CURRENT
MAX15040 toc03
OUTPUT CURRENT (A)
EFFICIENCY (%)
1
50
60
70
80
90
100
40
0.1
10
V
DD
= 3.3V
V
IN
= 2.5V
V
OUT
= 1.8V
V
OUT
= 1.2V
V
OUT
= 1.5V
FREQUENCY
vs. INPUT VOLTAGE
MAX15040 toc04
INPUT VOLTAGE (V)
FREQUENCY (MHz)
3.4
3.2
2.6
2.8
3.0
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
0.80
2.4
3.6
T
A
= -40
°C
T
A
= +25
°C
T
A
= +85
°C
LINE REGULATION
MAX15040 toc05
INPUT VOLTAGE (V)
OUTPUT VOLTAGE ERROR (%)
3.4
3.2
3.0
2.8
2.6
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
2.4
3.6
V
OUT
= 1.8V
V
OUT
= 1.2V
LOAD REGULATION
MAX15040 toc06
LOAD CURRENT (A)
OUTPUT VOLTAGE ERROR (%)
3
2
1
-0.40
-0.30
-0.20
-0.10
0
0.10
-0.50
0
4
V
OUT
= 1.8V
V
OUT
= 1.2V
V
OUT
= 2.5V
V
OUT
= 1.5V
INTERNAL REFERENCE
LOAD-TRANSIENT RESPONSE
MAX15040 toc07
40
µs/div
V
OUT
I
OUT
AC-COUPLED
100mV/div
0
1A/div
SWITCHING WAVEFORMS
MAX15040 toc08
400ns/div
I
LX
V
OUT
V
LX
AC-COUPLED
50mV/div
0
0
2A/div
2V/div
SHUTDOWN WAVEFORM
MAX15040 toc09
10
µs/div
V
EN
V
OUT
2V/div
0
0
1V/div
I
OUT
= 1.8A
SOFT-START WAVEFORM
MAX15040 toc10
400
µs/div
V
EN
V
OUT
2V/div
0
0
1V/div
Typical Operating Characteristics (continued)
(V
IN
= V
DD
= 3.3V, output voltage = 1.8V, I
LOAD
= 4A, and T
A
= +25°C, circuit of Figure 1, unless otherwise noted.)