LT1946EMS8 Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LT1946EMS8 Datasheet PDF : 12 Pages
| |||
LT1946
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3V, VSHDN = VIN unless otherwise specified. (Note 2)
SYMBOL
SHDN Input Voltage High
SHDN Input Voltage Low
SHDN Pin Bias Current
CONDITIONS
VSHDN = 3V
VSHDN = 0V
MIN TYP MAX UNITS
2.4
V
0.5
V
16
32
µA
0
0.1
µA
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 LT1946E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Current flows out of FB pin.
Note 4: Current limit guaranteed by design and/or correlation to static test.
Current limit is independent of duty cycle and is guaranteed by design.
TYPICAL PERFOR A CE CHARACTERISTICS
Feedback Pin Voltage
1.28
1.27
1.26
1.25
1.24
1.23
1.22
1.21
1.20
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
1946 G01
Switch Saturation Voltage
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
SWITCH CURRENT (A)
1946 G04
Oscillator Frequency
1400
1200
1000
800
TA = –30°C
600
TA = 100°C
TA = 25°C
400
200
0
0 0.2 0.4 0.6 0.8 1.0 1.2
FEEDBACK VOLTAGE (V)
1946 G02
Current Limit
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1946 G03
Quiescent Current
3.8
3.6
3.4
Switching Waveforms
for Figure 1 Circuit
VOUT
20mV/DIV
AC COUPLED
3.2
VSW
3.0
5V/DIV
2.8
0V
2.6
ILI
0.5A/DIV
2.4
AC COUPLED
2.2
0.5µs/DIV
2.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1946 G05
1946 G06
1946fb
3
Share Link: 