317B 查看數據表（PDF） - Linear Technology
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317B Datasheet PDF : 16 Pages
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LT1317/LT1317B
ELECTRICAL CHARACTERISTICS
Commercial Grade VIN = 2V, VSHDN = 2V, TA = 25°C unless otherwise noted.
SYMBOL PARAMETER
Shutdown Pin Current
LBI Threshold Voltage
LBO Output Low
LBO Leakage Current
LBI Input Bias Current (Note 4)
Low-Battery Detector Gain
Switch Leakage Current
Switch VCE Sat
Reference Line Regulation
SHDN Input Voltage High
SHDN Input Voltage Low
CONDITIONS
VSHDN = VIN
VSHDN = 0V
ISINK = 10µA
VLBI = 250mV, VLBO = 5V
VLBI = 150mV
1MΩ Load
VSW = 5V
ISW = 500mA
1.8V ≤ VIN ≤ 12V
MIN
q
q
190
q 180
q
q
q
q
q
q
q 1.4
q
TYP
0.015
– 2.3
200
200
0.15
0.02
5
2000
0.01
300
0.08
MAX UNITS
0.06
µA
–6
µA
210
mV
220
mV
0.25
V
0.1
µA
40
nA
V/V
3
µA
350
mV
400
mV
0.15
%/V
6
V
0.4
V
Industrial Grade VIN = 2V, VSHDN = 2V, – 40°C ≤ TA ≤ 85°C unless otherwise noted.
SYMBOL PARAMETER
IQ
Quiescent Current
VFB
Feedback Voltage
IB
FB Pin Bias Current (Note 2)
Input Voltage Range
gm
Error Amp Transconductance
Maximum Duty Cycle
Switch Current Limit (Note 3)
fOSC
Switching Frequency
Shutdown Pin Current
LBI Threshold Voltage
LBO Output Low
LBO Leakage Current
LBI Input Bias Current (Note 4)
Switch Leakage Current
Switch VCE Sat
Reference Line Regulation
SHDN Input Voltage High
SHDN Input Voltage Low
CONDITIONS
MIN
Not Switching, VSHDN = 2V (LT1317) q
VSHDN = 0V (LT1317/LT1317B)
q
VSHDN = 2V, Switching (LT1317B)
q
q 1.20
q
q 1.7
∆I = 5µA
q 70
q 80
VIN = 2.5V, Duty Cycle = 30%
q 550
q 500
VSHDN = VIN
VSHDN = 0V
q
q
q 180
ISINK = 10µA
VLBI = 250mV, VLBO = 5V
VLBI = 150mV
VSW = 5V
ISW = 500mA
1.8V ≤ VIN ≤ 12V
q
q
q
q
q
q
q 1.4
q
TYP
MAX UNITS
160
µA
40
µA
7.5
mA
1.26
V
80
nA
12
V
140
240 µmhos
%
1350
mA
750
kHz
0.1
µA
–7
µA
220
mV
0.25
V
0.1
µA
60
nA
3
µA
400
mV
0.15
%/V
6
V
0.4
V
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Bias current flows into FB pin.
Note 3: Switch current limit guaranteed by design and/or correlation to
static tests. Duty cycle affects current limit due to ramp generator.
Note 4: Bias current flows out of LBI pin.
3
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