LT3480
3
3480fb
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.
The
l
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
RUN/SS
= 10V, V
BOOST
= 15V, V
BD
= 3.3V unless otherwise noted. (Note 2)
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
IN
and RUN/SS pins is 60V for
nonrepetitive 1 second transients, and 40V for continious operation.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Quiescent Current from V
IN
V
RUN/SS
= 0.2V
V
BD
= 3V, Not Switching
V
BD
= 0, Not Switching
l
0.01
30
105
0.5
100
160
μA
μA
μA
Quiescent Current from BD
V
RUN/SS
= 0.2V
V
BD
= 3V, Not Switching
V
BD
= 0, Not Switching
l
0.01
80
1
0.5
120
5
μA
μA
μA
Minimum Bias Voltage (BD Pin)
2.7
3
V
Feedback Voltage
l
780
775
790
790
800
805
mV
mV
FB Pin Bias Current (Note 3)
V
FB
= 0.8V, V
C
= 0.4V
l
7
30
nA
FB Voltage Line Regulation
4V < V
IN
< 36V
0.002
0.01
%/V
Error Amp g
m
400
μMho
Error Amp Gain
1000
V
C
Source Current
45
μA
V
C
Sink Current
45
μA
V
C
Pin to Switch Current Gain
3.5
A/V
V
C
Clamp Voltage
2
V
Switching Frequency
R
T
= 8.66k
R
T
= 29.4k
R
T
= 187k
2.1
0.9
160
2.4
1
200
2.7
1.15
240
MHz
MHz
kHz
Minimum Switch Off-Time
l
60
150
nS
Switch Current Limit
Duty Cycle = 5%
3
3.5
4
A
Switch V
CESAT
I
SW
= 2A
500
mV
Boost Schottky Reverse Leakage
V
SW
= 10V, V
BD
= 0V
0.02
2
μA
Minimum Boost Voltage (Note 4)
l
1.5
2.1
V
BOOST Pin Current
I
SW
= 1A
22
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
100
mV
PG Hysteresis
12
mV
PG Leakage
V
PG
= 5V
0.1
1
μA
PG Sink Current
V
PG
= 0.4V
l
100
600
μA
SYNC Low Threshold
0.5
V
SYNC High Threshold
0.7
V
SYNC Pin Bias Current
V
SYNC
= 0V
0.1
μA
ELECTRICAL CHARACTERISTICS
