1A, 4.5V to 40V Input Buck Converters with
50mA Auxiliary LDO Regulators
ELECTRICAL 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, T A = T J = -40°C to +125°C, unless otherwise noted.
Typical values are at T A = +25°C.) (Note 1)
PARAMETER
Output Current
SYMBOL
I OUT
CONDITIONS
V IN = 6V (Note 2)
MIN
65
TYP
MAX
200
UNITS
mA
I LDO_OUT = 100μA
4.90
5
5.06
SET_LDO = SGND,
MAX1501_A
I LDO_OUT = 1mA
6V ≤ V IN_LDO ≤ 40V,
I LDO_OUT = 1mA
1mA ≤ I OUT ≤ 50mA,
V IN_LDO = 14V
4.90
4.85
4.85
5
5
5
5.06
5.15
5.15
Output Voltage
V LDO_OUT
I LDO_OUT = 100μA
3.22
3.3
3.35
V
I LDO_OUT = 1mA
3.22
3.3
3.35
SET_LDO = SGND,
MAX1501_B
6V ≤ V IN_LDO ≤ 40V,
I LDO_OUT = 1mA
3.2
3.3
3.4
1mA ≤ I LDO_OUT ≤
50mA, V IN_LDO =
3.2
3.3
3.4
14V
Adjustable Output Voltage Range
V ADJ
V SET_LDO > 0.25V
1.5
11.0
V
V IN_LDO = 5V,
I OUT = 10mA
0.6
Dropout Voltage
? V DO
MAX1501_A
V IN_LDO = 4.0V,
I OUT = 50mA
I OUT = 10mA
0.82
0.1
V
MAX1501_B
I OUT = 50mA
0.4
Startup Response Time
From EN_SYS high to LDO_OUT rise,
R L = 500 ? , SET_LDO = SGND
400
μs
SET_LDO Reference Voltage
Minimum SET_LDO Threshold
SET_LDO Input Leakage Current
Power-Supply Rejection Ratio
V SET_LDO
I SET_LDO
PSRR
(Note 3)
V SET_LDO = 11V
I OUT = 10mA, f = 100Hz, 500mV P-P ,
V LDO_OUT = 5V
1.220
1.241
185
0.5
78
1.265
100
V
mV
nA
dB
I OUT = 10mA, f = 1MHz, 500mV P-P ,
V LDO_OUT = 5V
24
Short-Circuit Current
I SC
125
185
300
mA
_______________________________________________________________________________________
5
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