Typical operating characteristics (continued) – Rainbow Electronics MAX1541 User Manual
Page 11
MAX1540/MAX1541
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
______________________________________________________________________________________
11
1.0V OUTPUT VOLTAGE (OUT1)
vs. LOAD CURRENT
MAX1540 toc04
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
4
3
1
2
0.99
1.00
1.01
1.02
0.98
0
5
SKIP = GND
SKIP = V
CC
OUT2 SWITCHING FREQUENCY
vs. LOAD CURRENT
(V
OUT2
= 2.5V)
MAX1540 toc05
LOAD CURRENT (A)
SWITCHING FREQUENCY (kHz)
4
3
2
1
100
200
300
400
500
600
0
0
5
SKIP = GND
SKIP = V
CC
OUT1 SWITCHING FREQUENCY
vs. LOAD CURRENT
(V
OUT1
= 1.0V)
MAX1540 toc06
LOAD CURRENT (A)
SWITCHING FREQUENCY (kHz)
4
3
2
1
100
200
300
400
500
600
0
0
5
SKIP = GND
SKIP = V
CC
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX1540 toc07
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
24
20
16
12
8
4
250
300
350
400
450
200
0
28
4A LOAD
NO LOAD
2.5V OUTPUT
SKIP = V
CC
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX1540 toc08
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (A)
24
20
12
16
8
4
4.2
4.4
4.6
4.8
5.0
5.2
5.4
5.6
5.8
6.0
4.0
0
28
2.5V OUTPUT
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
(FORCED-PWM OPERATION)
MAX1540 toc09
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
24
20
16
12
8
4
4
8
12
16
20
0
0
28
I
BIAS
I
IN
SKIP = ON1 = ON2 = V
CC
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
(PULSE-SKIPPING OPERATION)
MAX1540 toc10
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
24
20
16
12
8
4
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
0
28
SKIP = GND
ON1 = ON2 = V
CC
I
BIAS
I
IN
2.0V REFERENCE LOAD REGULATION
MAX1540 toc11
REFERENCE LOAD CURRENT (
µA)
REFERENCE VOLTAGE DEVIATION (mV)
100
80
60
40
20
0
-3
-2
-1
0
1
2
3
4
-4
-20
REFERENCE DISTRIBUTION
MAX1540 toc12
REFERENCE VOLTAGE (V)
SAMPLE PERCENTAGE (%)
2.005
2.000
1.995
10
20
30
40
50
0
1.990
2.010
SAMPLE SIZE = 50
Typical Operating Characteristics (continued)
(MAX1541 Circuit of Figure 12, V
IN
= 12V, V
DD
= V
CC
= 5V, SKIP = GND, TON = REF, T
A
= +25°C, unless otherwise noted.)