LT1940 Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LT1940 Datasheet PDF : 20 Pages
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LT1940/LT1940L
ABSOLUTE AXI U RATI GS
(Note 1)
VIN Voltage
LT1940 .................................................... (–0.3), 25V
LT1940L ................................................... (–0.3), 7V
BOOST Pin Voltage
LT1940 ................................................................ 35V
LT1940L ............................................................. 16V
BOOST Pin Above SW Pin
LT1940 ................................................................ 25V
LT1940L ............................................................. 16V
PG Pin Voltage
LT1940 ................................................................ 25V
LT1940L ............................................................... 7V
SW Voltage ................................................................VIN
RUN/SS, FB Pins ...................................................... 6V
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2) ...–40°C to 85°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
BOOST1 1
SW1 2
VIN 3
VIN 4
VIN 5
VIN 6
SW2 7
BOOST2 8
TOP VIEW
16 FB1
15 VC1
14 PG1
13 RUN/SS1
17
12 RUN/SS2
11 PG2
10 VC2
9 FB2
ORDER PART
NUMBER
LT1940EFE
LT1940LEFE
FE PART
MARKING
FE PACKAGE
16-LEAD PLASTIC TSSOP
EXPOSED PAD (PIN 17) IS GND
MUST BE SOLDERED TO PCB
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
1940EFE
1940LEFE
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VBOOST = 8V unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Operating Voltage
q
3.4
3.6
V
Quiescent Current
Not Switching
3.8
4.8
mA
Shutdown Current
Feedback Voltage
VRUNSS = 0V
0°C to 70°C
–40°C to 85°C
30
45
µA
1.230 1.250 1.270
V
q 1.225 1.250 1.270
V
q 1.215 1.250 1.270
V
FB Pin Bias Current
Reference Line Regulation
Error Amp GM
VFB = 1.25V, VC = 0.4V
LT1940: VIN 5V to 25V
LT1940L: VIN 4V to 7V
q
240 1200
nA
0.005
%/V
0.005
%/V
330
uMhos
Error Amp Voltage Gain
180
VC Source Current
VC Sink Current
VFB = 1V
VFB = 1.5V
42
µA
60
µA
VC Pin to Switch Current Gain
VC Switching Threshold
VC Clamp Voltage
Switching Frequency
VFB = 1.1V
2.4
A/V
0.75
V
1.8
V
1
1.1 1.25
MHz
q 0.95
1.1
1.35
MHz
Switching Phase
150 180 210
Deg
Maximum Duty Cycle
q 78
88
%
Frequency Shift Threshold on FB
fSW = 1MHz
0.5
V
1940fa
2
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