Dual, 4A/2A, 4MHz, Step-Down DC-DC
Regulator with Dual LDO Controllers
Typical Operating Characteristics (continued)
(V AVIN = V DVDD1 = V DVDD2 = V PVIN1 = V PVIN2 = 5V, V OUT1 = 3.3V, V OUT2 = 1.5V, V PGND_ = 0V, R T = 16.5k ? . T A = +25°C, unless
otherwise noted.)
CHANNEL 1 LOAD STEP RESPONSE
MAX15022 toc15
EN2 = 0V
20 μ s/div
CHANNEL 2 LOAD STEP RESPONSE
MAX15022 toc17
EN1 = 0V
20 μ s/div
180 ° OUT-OF-PHASE OPERATION
MAX15022 toc19
V PVIN1
5V/div
0V
V OUT1
3.3V, AC-COUPLED
100mV/div
I OUT1
2A/div
0A
V PVIN2
5V/div
0V
V OUT2
1.5V, AC-COUPLED
100mV/div
I OUT2
1A/div
0A
14
CHANNEL 1 LOAD STEP RESPONSE
MAX15022 toc16
EN2 = 0V
20 μ s/div
CHANNEL 2 LOAD STEP RESPONSE
MAX15022 toc18
EN1 = 0V
20 μ s/div
CHANNEL 3 AND CHANNEL 4 OUTPUT-
VOLTAGE DEVIATION vs. LOAD CURRENT
V PVIN1
5V/div
0V
V OUT1
3.3V, AC-COUPLED
100mV/div
I OUT1
2A/div
0A
V PVIN2
5V/div
0V
V OUT2
1.5V, AC-COUPLED
100mV/div
I OUT2
1A/div
0A
PVIN1 = PVIN2
5V/div
0V
V LX1
5V/div
0V
12
10
8
CHANNEL 3, V IN = 3.3V,
V OUT3 = 2.5V
NJT403OP PNP
V LX2
5V/div
0V
6
4
CHANNEL 4, V IN = 2.5V,
IOUT1 = 3A
IOUT2 = 1.5A
200ns/div
2
0
0
V OUT4 = 1.5V
NJT403OP PNP
50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
_______________________________________________________________________________________
7
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