Datasheet

LTC3104
3
3104f
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= V
INLDO
= 10V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Step-Down Converter
Input Voltage Range
l
2.5 15 V
Input Undervoltage Lockout Threshold V
IN
Rising
V
IN
Rising, T
J
= 0°C to 85°C (Note 4)
l
2.1
2.1
2.6
2.5
V
V
Input Undervoltage Lockout Hysteresis (Note 4) 0.4 V
Feedback Voltage (Note 5)
l
0.588 0.6 0.612 V
Feedback Voltage Line Regulation V
IN
= 2.5V to 15V (Note 5) 0.02 0.05 %/V
Feedback Input Current (Note 5)
l
1 20 nA
Oscillator Frequency
T
J
= 0°C to 85°C (Note 4)
l
0.93
1.0
1.2
1.2
1.55
1.45
MHz
MHz
Quiescent Current, V
IN
—Active RUN = V
IN
, RUNLDO = V
IN
, MODE = 0V,
FB > 0.612, Nonswitching
600 µA
Quiescent Current, V
IN
—Sleep T
J
= 0°C to 85°C, RUN = MODE = V
IN
, FB > 0.612
RUNLDO = V
IN
(Note 4)
RUNLDO = 0V (Note 4)
2.6
1.8
3.3
2.6
µA
µA
RUN = MODE = V
IN
, FB > 0.612
RUNLDO = V
IN
RUNLDO = 0V
l
l
2.8
1.8
5.5
4.5
µA
µA
Quiescent Current, V
IN
—Shutdown
RUN = 0V, RUNLDO = 0V, T
J
= 0°C to 85°C (Note 4)
RUN = 0V, RUNLDO = 0V
l
1
1
1.7
3.3
µA
µA
N-Channel MOSFET Synchronous Rectifier Leakage
Current
V
IN
= V
SW
=15V, V
RUN
= 0V 0.01 0.3 µA
N-Channel MOSFET Switch Leakage Current V
IN
=15V, V
SW
= 0V, V
RUN
= 0V 0.01 0.3 µA
N-Channel MOSFET Synchronous Rectifier R
DS(ON)
I
SW
= 200mA 0.85 Ω
N-Channel MOSFET Switch R
DS(ON)
I
SW
= –200mA 0.65 Ω
Peak Current Limit
l
0.40 0.50 0.75 A
PGOOD Threshold FB Falling, Percentage Below FB –14 –10 –5 %
PGOOD Hysteresis Percentage of FB 2 %
PGOOD Voltage Low I
PGOOD
= 100µA 0.2 V
PGOOD Leakage Current V
PGOOD
= 5V 0.01 0.3 µA
Maximum Duty Cycle
l
89 92 %
Switch Minimum Off Time (t
OFF(MIN)
) (Note 4) 65 ns
Synchronous Rectifier Minimum On Time (t
ON(MIN)
) (Note 4) 70 ns
RUN Pin Threshold RUN Pin Rising
l
0.76 0.8 0.85 V
RUN Pin Hysteresis 0.06 V
RUN Input Current RUN = 1.2V
l
0.01 0.4 µA
MODE Threshold
l
0.5 0.8 1.2 V
MODE Input Current MODE = 1.2V 0.1 4 µA
Soft-Start Time 0.7 1.4 2.5 ms
LDO Regulator
LDO Input Voltage Range (V
IN(LDO)
)
l
2.5 15 V
LDO Output Voltage Range (V
LDO
) I
LDO
= 1mA
l
0.6 14.5 V
LDO Feedback Voltage
l
0.576 0.6 0.624 V
LDO Feedback Input Current
l
1 20 nA