Datasheet

LT3481
3
3481fc
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
●
3 3.6 V
Quiescent Current from V
IN
V
RUN/SS
= 0.2V 0.01 0.5 μA
V
BIAS
= 3V, Not Switching
●
22 60 μA
V
BIAS
= 0, Not Switching 75 120 μA
Quiescent Current from BIAS V
RUN/SS
= 0.2V 0.01 0.5 μA
V
BIAS
= 3V, Not Switching
●
50 120 μA
V
BIAS
= 0, Not Switching 05 μA
Minimum Bias Voltage 2.7 3 V
Feedback Voltage
●
1.25
1.24
1.265
1.265
1.29
1.3
V
V
FB Pin Bias Current (Note 3) V
FB
= 1.25V, V
C
= 0.4V
●
30 100 nA
FB Voltage Line Regulation 4V < V
IN
< 34V 0.002 0.02 %/V
Error Amp g
m
330 μMho
Error Amp Gain 800
V
C
Source Current 65 μA
V
C
Sink Current 85 μA
V
C
Pin to Switch Current Gain 3.5 A/V
V
C
Clamp Voltage 2V
Switching Frequency R
T
= 8.66k
R
T
= 29.4k
R
T
= 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 LT3481E 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. The LT3481I specifi cations are
guaranteed over the –40°C to 125°C temperature range. The LT3481H
specifi cations are guaranteed over the –40°C to 150°C operating
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
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