Datasheet

LT3575
3
3575f
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 LT3575E is guaranteed to meet performance specifi cations
from 0°C to 125°C junction temperature. Specifi cations over the –40°C
to 125°C operating junction temperature range are assured by design
characterization and correlation with statistical process controls. The
LT3575I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3: Current fl ows out of the R
REF
pin.
PARAMETER CONDITIONS MIN TYP MAX UNITS
I
REF
Reference Current Measured at R
FB
Pin with R
REF
= 6.49k 190 μA
Error Amplifi er Voltage Gain V
IN
= 3V 150 V/V
Error Amplifi er Transconductance
ΔI = 10μA, V
IN
= 3V
150 μmhos
Minimum Switching Frequency V
C
= 0.35V 40 kHz
TC Current into R
REF
R
TC
= 20.1k 27.5 μA
BIAS Pin Voltage I
BIAS
= 30mA 2.9 3 3.1 V
ELECTRICAL CHARACTERISTICS
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
= 12V, unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage Quiescent Current
Bias Pin Voltage
T
A
= 25°C, unless otherwise noted.
TEMPERATURE (°C)
–50
4.80
V
OUT
(V)
4.85
4.95
5.00
5.05
5.20
5.15
0
50
75
4.90
5.10
–25
25
100
125
3575 G01
TEMPERATURE (°C)
–50
0
I
Q
(mA)
2
3
4
8
6
7
0
50
75
1
5
–25
25
100
125
3575 G02
V
IN
= 40V WITH BIAS = 20V
V
IN
= 5V WITH BIAS = 5V
TEMPERATURE (°C)
–50
2.0
BIAS VOLTAGE (V)
2.4
2.6
2.8
3.2
0
50
75
2.2
3.0
–25
25
100
125
3575 G03
V
IN
= 40V
V
IN
= 12V