Datasheet

LT3574
3
3574f
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 LT3574E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design
characterization and correlation with statistical process controls. The
LT3574I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3: Current flows out of the R
REF
pin.
electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications 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
3574 G01
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (mA)
4
5
6
25 75
3574 G02
3
2
–25 0
50 100 125
1
0
V
IN
= 40V
BIAS = 20V
V
IN
= 5V
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
3574 G03
V
IN
= 40V
V
IN
= 12V
PARAMETER CONDITIONS MIN TYP MAX UNITS
Error Amplifier Transconductance
DI = 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