MAX15014_07 Datasheet, PDF (11/26 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.)
LDO TURN-ON/-OFF WAVEFORM
WITH INCREASING V_IN
MAX15014 toc33
I_LOAD = 5mA
V_IN
2V/div
0V
V_{LDO_OU}
2V/div
0V
TURN-ON/-OFF WAVEFORM
INCREASING V_IN
MAX15014 toc34
MAX15015B
R_LOAD = 66Ω
V_IN
5V/div
0V
V_{LDO_OUT}
1V/div
0V
10ms/div
10ms/div
TURN-ON/-OFF WAVEFORM
INCREASING V_IN
MAX15014 toc35
MAX15015B
R_LOAD = 660Ω
V_IN
5V/div
0V
LOAD-TRANSIENT RESPONSE
MAX15014 toc36
V_{LDO_OUT}
AC-COUPLED
100mV/div
V_{LDO_OUT}
1V/div
0V
10ms/div
INPUT-VOLTAGE STEP RESPONSE
MAX15014 toc37
MAX15015B
I_LOAD = 1mA
V_IN
20V/div
0V
V_{LDO_OUT}
AC-COUPLED
100mV/div
I_LOAD
20mA/div
0
100µs/div
RESIDUAL SWITCHING NOISE
ON THE LDO OUTPUT
MAX15014 toc38
DC-DC_LOAD = 1A
V_{LDO_OUT}
10mV/div
1ms/div
400ns/div
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