MAX15014_07 Datasheet, PDF (7/26 Pages) Maxim Integrated Products – 1A, 4.5V to 40V Input Buck Converters with 50mA Auxiliary LDO Regulators

1A, 4.5V to 40V Input Buck Converters with
50mA Auxiliary LDO Regulators
Typical Operating Characteristics
(V_{IN_SW} = V_{IN_LDO} = V_DRAIN =14V, V_{EN_SYS} = V_{EN_SW} = 2.4V, V_REG = V_DVREG, V_SYNC = V_{SET_LDO} = V_SGND = V_PGND = 0V, C_REG =
1µF, C_{IN_SW} = 0.1µF, C_{IN_LDO} = 0.1µF, C_{LDO_OUT} = 10µF, C_DRAIN = 0.22µF, see Figures 6 and 7, T_A = +25°C, unless otherwise noted.)
SYSTEM SHUTDOWN CURRENT
vs. TEMPERATURE
10
9 ^MAX15016
8
7
6
5
4
3
2
1
0
-50
0
50
100
150
TEMPERATURE (°C)
SWITCHING FREQUENCY
vs. TEMPERATURE
140
139 MAX15016A
138
137
136
135
134
133
132
131
130
-60 -40 -20 0 20 40 60 80 100 120 140 160
TEMPERATURE (°C)
SWITCHING FREQUENCY
vs. TEMPERATURE
530
MAX15015A
520
510
500
490
480
470
460
450
-60 -40 -20 0 20 40 60 80 100 120 140 160
TEMPERATURE (°C)
MAXIMUM DUTY CYCLE
vs. INPUT VOLTAGE (MAX15016A)
100
99
98
97
96
95
94
93
92
91
90
0
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
MAXIMUM DUTY CYCLE
vs. INPUT VOLTAGE (MAX15015A)
100
98
96
94
92
90
88
86
84
82
80
0
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
ERROR AMPLIFIER OPEN-LOOP GAIN
AND PHASE vs. FREQUENCY
110
MAX15014 toc06
100
340
90
300
80
GAIN
70
260
60
50
220
40
180
30
20
PHASE
140
10
100
0
-10
60
0.1 1 10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
OUTPUT CURRENT LIMIT
vs. INPUT VOLTAGE
2.5
T_A = 0°C
2.0 ^{TA = +25°C}
1.5
TURN-ON/-OFF WAVEFORM
MAX15014 toc08
I_LOAD = 1A
TURN-ON/-OFF WAVEFORM
MAX15014 toc09
I_LOAD = 100mA
EN_SW
EN_SW
2V/div
2V/div
0V
0V
1.0
T_A = +85°C
T_A = +135°C
0.5
0V
0
0
10
20
30
40
50
INPUT VOLTAGE (V)
2ms/div
V_OUT
2V/div
0V
2ms/div
V_OUT
2V/div
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