MAX1540A Datasheet, PDF (11/49 Pages) Maxim Integrated Products – Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator

Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
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.)
1.0V OUTPUT VOLTAGE (OUT1)
vs. LOAD CURRENT
1.02
SKIP = GND
SKIP = V_CC
1.01
OUT2 SWITCHING FREQUENCY
vs. LOAD CURRENT
(V_OUT2 = 2.5V)
600
500
400
OUT1 SWITCHING FREQUENCY
vs. LOAD CURRENT
(V_OUT1 = 1.0V)
600
500
400
1.00
300
300
0.99
0.98
0
1
2
3
4
5
LOAD CURRENT (A)
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
450
2.5V OUTPUT
SKIP = V_CC
400
4A LOAD
350
NO LOAD
300
250
200
0 4 8 12 16 20 24 28
INPUT VOLTAGE (V)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
(PULSE-SKIPPING OPERATION)
1.00
I_BIAS
0.10
0.01
0
I_N
SKIP = GND
ON1 = ON2 = V_CC
4 8 12 16 20 24 28
INPUT VOLTAGE (V)
200
100
0
0
SKIP = GND
SKIP = V_CC
1
2
3
4
5
LOAD CURRENT (A)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
6.0
2.5V OUTPUT
5.8
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
0 4 8 12 16 20 24 28
INPUT VOLTAGE (V)
2.0V REFERENCE LOAD REGULATION
4
3
2
1
0
-1
-2
-3
-4
-20
0 20 40 60 80 100
REFERENCE LOAD CURRENT (μA)
200
100
0
0
SKIP = GND
SKIP = V_CC
1
2
3
4
5
LOAD CURRENT (A)
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
(FORCED-PWM OPERATION)
20
16
I_BIAS
12
I_IN
8
4
SKIP = ON1 = ON2 = V_CC
0
0 4 8 12 16 20 24 28
INPUT VOLTAGE (V)
REFERENCE DISTRIBUTION
50
SAMPLE SIZE = 50
40
30
20
10
0
1.990
1.995 2.000 2.005
REFERENCE VOLTAGE (V)
2.010
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