MAX1858A Datasheet, PDF (4/22 Pages) Maxim Integrated Products – Dual 180° Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR

Dual 180° Out-of-Phase Buck Controllers with
Sequencing/Prebias Startup and POR
Typical Operating Characteristics
(Circuit of Figure 1, V_IN = 12V, T_A = +25°C, unless otherwise noted.)
100
90
80
70
60
50
40
30
20
10
0
0.1
EFFICIENCY vs. LOAD
OUT2
OUT1
1
10
LOAD (A)
OUTPUT VOLTAGE ACCURACY vs. LOAD
1.0
0.8
0.6
0.4
0.2
OUT2
0
-0.2
OUT1
-0.4
-0.6
-0.8
-1.0
100
0
5
10
15
LOAD (A)
0.5
0
-0.5
-1.0
-1.5
-2.0
0
V_L VOLTAGE ACCURACY
vs. LOAD CURRENT
50
100
150
LOAD CURRENT (mA)
SWITCHING FREQUENCY vs. R_OSC
600
500
LOAD TRANSIENT RESPONSE (OUTPUT 1)
LOAD TRANSIENT RESPONSE (OUTPUT 2)
MAX1858A/75A/76A toc05
MAX1858A/75A/76A toc06
V_OUT2
50mV/div
V_OUT1
50mV/div
AC-COUPLED
AC-COUPLED
400
V_OUT1
50mV/div
V_OUT2
50mV/div
AC-COUPLED
AC-COUPLED
300
10A
10A
200
I_OUT1
I_OUT2
100
0A
0A
0
0 10 20 30 40 50 60
R_OSC (kΩ)
SOFT-START AND SOFT-STOP WAVEFORM
(MAX1858A ONLY)
MAX1858A/75A/76A toc07
10V
EN
0V
10µs/div
V_OUT1
1V/div
I_OUT1 = 300mA
0V
V_OUT2
1V/div
I_OUT2 = 300mA
0V
10µs/div
SOFT-START AND SOFT-STOP WAVEFORM
(MAX1858A ONLY)
MAX1858A/75A/76A toc08
EN PULLED HIGH BEFORE V_OUT1 REACHES 0V.
5V
EN
0V
V_OUT1
1V/div
I_OUT1 = 300mA
0V
V_OUT2
1V/div
I_OUT2 = 300mA
0V
2ms/div
2ms/div
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