Datasheet

LTC3537
3
3537fd
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. (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



R
PMOS
PMOS Switch On Resistance V
OUTB
= 1.8V
V
OUTB
= 3.3V
V
OUTB
= 5V
1
0.6
0.4



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 µA
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 µA
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 µA
V
PGDBLOW
PGDB Voltage Low I
PGDB
= 5mA 200 mV
I
PGDBLEAK
PGDB Leakage Current V
PGDB
= 5.5V 0.01 1 µA
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
5V
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 specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T
A
= 25°C. (Note 2)
V
INL
= 3.3V, V
OLDO
= 3V, unless otherwise noted.