MAX15014_07 Datasheet, PDF (10/26 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 (continued)
(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.)
DROPOUT VOLTAGE vs. LOAD CURRENT
900
V_IN = 5V, I_LOAD = 0 TO 50mA
800 _MAX15015A
T_A = +135°C
700
600
T_A = +85°C
500
T_A = +25°C
400
T_A = -40°C
300
200
100
0
0
10
20
30
40
50
LOAD CURRENT (mA)
POWER-SUPPLY REJECTION RATIO
10
0
I_{LDO_OUT} = 50mA
-10
-20
I_{LDO_OUT} = 10mA
-30
-40
-50
-60
-70
I_{LDO_OUT} = 1mA
-80
0.1k
1k 10k 100k 1M 10M
FREQUENCY (Hz)
TURN-ON/-OFF WAVEFORM
TOGGLING EN_SYS
MAX15014 toc28
I_LOAD = 50mA
EN_SYS
2V/div
0V
V_OUT
2V/div
0V
2ms/div
TURN-ON/-OFF WAVEFORM
TOGGLING EN_SYS
MAX15014 toc29
R_LOAD = 1kΩ
EN_SYS
2V/div
0V
TURN-ON/-OFF WAVEFORM
TOGGLING EN_SYS
MAX15014 toc30
MAX15015B
R_LOAD = 66Ω
EN_SYS
2V/div
0V
V_OUT
2V/div
V_{LDO_OUT}
1V/div
0V
0V
10ms/div
10ms/div
TURN-ON/-OFF WAVEFORM
TOGGLING EN_SYS
MAX15014 toc31
MAX15015B
R_LOAD = 660Ω
0V
EN_SYS
2V/div
V_{LDO_OUT}
1V/div
0V
TURN-ON/-OFF WAVEFORM
INCREASING V_IN
MAX15014 toc32
I_LOAD = 50mA
V_IN
5V/div
0V
V_{LDO_OUT}
2V/div
0V
10ms/div
10ms/div
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