Datasheet

LT3480
3
3480fe
For more information www.linear.com/LT3480
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.
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications 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 2: The LT3480E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3480I specifications are
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
l
3 3.6 V
V
IN
Overvoltage Lockout
l
36 38 40 V
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
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