LTC3537
3
3537fd
ELECTRICAL CHARACTERISTICS
The l denotes the speci cations which apply over the full operating
temperature range, otherwise speci cations are at T
A
= 25癈. (Note 2) V
INB
= 1.2V, V
OUTB
= 3.3V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
R
NMOS
NMOS Switch On Resistance V
OUTB
= 1.8V
V
OUTB
= 3.3V
V
OUTB
= 5V
0.8
0.4
0.3
?/DIV>
?/DIV>
?/DIV>
R
PMOS
PMOS Switch On Resistance V
OUTB
= 1.8V
V
OUTB
= 3.3V
V
OUTB
= 5V
1
0.6
0.4
?/DIV>
?/DIV>
?/DIV>
I
LIM
NMOS Current Limit
(Note 4)
l
600 750
mA
t
LIMDELAY
Current Limit Delay Time to
Output
(Note 3)
40
ns
Max Duty Cycle
V
FBB
= 1.15V
l 87 92
%
Min Duty Cycle
V
FBB
= 1.3V
l
0
%
f
SW
Switching Frequency
l 2 2.2 2.4 MHz
V
ENBSTH
ENBST Input High Voltage
0.8
V
V
ENBSTL
ENBST Input Low Voltage
0.3
V
I
ENBSTIN
ENBST Input Current
V
ENBST
= 5.5V
1.5
糀
V
MODEH
MODE Input High Voltage
0.8
V
V
MODEL
MODE Input Low Voltage
0.3
V
I
MODEIN
MODE Input Current
V
MODE
= 5.5V
1.5
糀
t
SS
Soft-Start Time
0.5
ms
V
FBLBI
LBI Feedback Voltage
Falling Threshold
530 553 575
mV
LBI Hysteresis Voltage
35
mV
I
LBIIN
LBI Input Current
V
LBI
= 1V
10 50
nA
V
LBOLOW
LBO Voltage Low
I
LBO
= 5mA
200
mV
I
LBOLEAK
LBO Leakage Current
V
LBO
= 5.5V
0.01 1
糀
V
PGDBLOW
PGDB Voltage Low
I
PGDB
= 5mA
200
mV
I
PGDBLEAK
PGDB Leakage Current
V
PGDB
= 5.5V
0.01 1
糀
PGDB Trip Point Voltage V
FBB
Rising
94
% V
OUTB
PGDB Hysteresis
6
%
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
LDO Regulator
V
INL
Input Voltage Range
1.8
5.5
V
V
OLDO
Output Voltage Range
I
LOAD
= 100mA
V
FBL
5
V
I
OUTMAX
Max Output Current
l
100
mA
V
FBL
Feedback Voltage
l
590 600 610
mV
Line Regulation
V
INL
= 1.8V to 5.5V
0.1
%
Load Regulation
I
LOAD
= 10mA to 90mA
0.4
%
V
DROPOUT
Dropout Voltage
I
O
= 50mA
100
mV
The l denotes the speci cations which apply over the full operating temperature range, otherwise speci cations are at T
A
= 25癈. (Note 2)
V
INL
= 3.3V, V
OLDO
= 3V, unless otherwise noted.
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