LT1949 Ver la hoja de datos (PDF) - Linear Technology
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LT1949 Datasheet PDF : 8 Pages
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LT1949
ABSOLUTE AXI U RATI GS (Note 1)
VIN, LBO Voltage ..................................................... 12V
SW Voltage ............................................... – 0.4V to 30V
FB Voltage .................................................... VIN + 0.3V
VC Voltage ................................................................ 2V
LBI Voltage ............................................ 0V ≤ VLBI ≤ 1V
SHDN Voltage ........................................................... 6V
Junction Temperature .......................................... 125°C
Operating Temperature Range (Note 2)
LT1949EMS8 .......................................–40°C to 85°C
LT1949ES8/LT1949IS8 .......................–40°C to 85°C
Storage Temperature ........................... – 65°C to 150°C
Lead Temperature (Soldering, 10sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VC 1
FB 2
SHDN 3
GND 4
8 LBO
7 LBI
6 VIN
5 SW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 120°C/W
ORDER PART
NUMBER
LT1949EMS8
MS8 PART MARKING
LTJC
Consult factory for Military grade parts.
TOP VIEW
VC 1
FB 2
SHDN 3
GND 4
8 LBO
7 LBI
6 VIN
5 SW
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 120°C/W
ORDER PART
NUMBER
LT1949ES8
LT1949IS8
S8 PART MARKING
1949E
1949I
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 2V, VSHDN = 2V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
IQ
Quiescent Current
VFB
Feedback Voltage
VSHDN = 0V
q
4.5
7.5
q
25
40
1.22
1.24
1.26
q 1.20
1.24
1.26
IB
FB Pin Bias Current (Note 3)
Input Voltage Range
q
12
80
q 1.7
12
gm
Error Amp Transconductance
AV
Error Amp Voltage Gain
Maximum Duty Cycle
∆I = 5µA
q 70
q 80
140
240
700
85
Switch Current Limit (Note 4)
fOSC
Switching Frequency
Shutdown Pin Current
LBI Threshold Voltage
VIN = 2.5V, Duty Cycle = 30%
VIN = 2.5V, Duty Cycle = 30%
VSHDN = VIN
VSHDN = 0V
1
1.13
1.5
q 0.95
1.5
q 500
600
750
q
0.015
0.1
q
– 2.3
–7
190
200
210
q 180
200
220
LBO Output Low
LBO Leakage Current
LBI Input Bias Current (Note 5)
Low-Battery Detector Gain
ISINK = 10µA
q
VLBI = 250mV, VLBO = 5V
q
VLBI = 150mV
q
1MΩ Pull-Up
0.15
0.25
0.02
0.1
5
60
2000
Switch Leakage Current
VSW = 5V
q
0.01
3
UNITS
mA
µA
V
V
nA
V
µmhos
V/V
%
A
A
kHz
µA
µA
mV
mV
V
µA
nA
V/V
µA
2
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