Datasheet

LT3681
3
3681f
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Schottky Diode Forward Voltage I
DA
= 1A
I
DA
= 2A
0.50
0.56
V
V
Power Schottky Diode Leakage Current V
DC-DA
= 40V 100 μA
Switching Frequency RT = 8.66k
RT = 29.4k
RT = 187k
2.5
1.25
250
2.8
1.4
300
3.1
1.55
350
MHz
MHz
kHz
Minimum Switch Off-Time
●
130 200 nS
Switch Current Limit Duty Cycle = 5% 3.2 3.8 4.4 A
Switch V
CESAT
I
SW
= 2A 360 mV
Boost Schottky Reverse Leakage V
SW
= 10V, V
BIAS
= 0V 0.02 2 µA
Minimum Boost Voltage (Note 4)
●
1.5 2.1 V
BOOST Pin Current I
SW
= 1A 18 35 mA
RUN/SS Pin Current V
RUN/SS
= 2.5V 5 10 μA
RUN/SS Input Voltage High 2.5 V
RUN/SS Input Voltage Low 0.2 V
PG Threshold Offset from Feedback Voltage V
FB
Rising 122 mV
PG Hysteresis 5 mV
PG Leakage V
PG
= 5V 0.1 1 μA
PG Sink Current V
PG
= 3V
●
100 600 μA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3681E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Bias current fl ows into the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 10V, V
RUNS/SS
= 10V V
BOOST
= 15V, V
BIAS
= 3.3V unless otherwise
noted. (Note 2)
ELECTRICAL CHARACTERISTICS