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ELECTRICAL CHARACTERISTICS
range, otherwise specifi cations are at T
PARAMETER
Quiescent Current from V
IN
Quiescent Current from BD
Minimum Bias Voltage (BD Pin)
Feedback Voltage
FB Pin Bias Current (Note 3)
FB Voltage Line Regulation
Error Amp g
m
Error Amp Gain
V
Source Current
C
V
Sink Current
C
V
Pin to Switch Current Gain
C
V
Clamp Voltage
C
Switching Frequency
Minimum Switch Off-Time
Switch Current Limit
Switch V
CESAT
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
RUN/SS Pin Current
RUN/SS Input Voltage High
RUN/SS Input Voltage Low
PG Threshold Offset from Feedback Voltage
PG Hysteresis
PG Leakage
PG Sink Current
SYNC Low Threshold
SYNC High Threshold
SYNC Pin Bias Current
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 LT3480E 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 LT3480I specifi cations are
guaranteed over the –40°C to 125°C temperature range.
l
The
denotes the specifi cations which apply over the full operating temperature
= 25°C. V
= 10V , V
= 10V , V
A
IN
RUN/SS
CONDITIONS
V
= 0.2V
RUN/SS
V
= 3V, Not Switching
BD
V
= 0, Not Switching
BD
V
= 0.2V
RUN/SS
V
= 3V, Not Switching
BD
V
= 0, Not Switching
BD
V
= 0.8V, V
= 0.4V
FB
C
4V < V
< 36V
IN
R
= 8.66k
T
R
= 29.4k
T
R
= 187k
T
Duty Cycle = 5%
I
= 2A
SW
V
= 10V, V
= 0V
SW
BD
I
= 1A
SW
V
= 2.5V
RUN/SS
V
Rising
FB
V
= 5V
PG
V
= 0.4V
PG
V
= 0V
SYNC
= 15V , V
= 3.3V unless otherwise noted. (Note 2)
BOOST
BD
l
l
l
l
l
l
l
Note 3: Bias current fl ows out of the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 5: Absolute Maximum Voltage at V
nonrepetitive 1 second transients, and 40V for continious operation.
LT3480
MIN
TYP
MAX
UNITS
0.01
0.5
30
100
105
160
0.01
0.5
80
120
1
5
2.7
3
780
790
800
775
790
805
7
30
0.002
0.01
400
μMho
1000
45
45
3.5
2
2.1
2.4
2.7
0.9
1
1.15
160
200
240
60
150
3
3.5
4
500
0.02
2
1.5
2.1
22
35
5
10
2.5
0.2
100
12
0.1
1
100
600
0.5
0.7
0.1
and RUN/SS pins is 60V for
IN
3480fb
μA
μA
μA
μA
μA
μA
V
mV
mV
nA
%/V
μA
μA
A/V
V
MHz
MHz
kHz
nS
A
mV
μA
V
mA
μA
V
V
mV
mV
μA
μA
V
V
μA
3
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