LT1308BIS8 データシートの表示（PDF） - Linear Technology
部品番号
コンポーネント説明
メーカー
LT1308BIS8 Datasheet PDF : 20 Pages
| |||
LT1308A/LT1308B
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. Industrial Grade –40°C to 85°C. VIN = 1.2V, VSHDN = VIN, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
fOSC
Switching Frequency
Maximum Duty Cycle
l 500
600
750
kHz
l 82
90
%
Switch Current Limit
Duty Cycle = 30% (Note 4)
2
3
4.5
A
Switch VCESAT
Burst Mode Operation Switch Current Limit
(LT1308A)
ISW = 2A (25°C, – 40°C), VIN = 1.5V
ISW = 2A (85°C), VIN = 1.5V
VIN = 2.5V, Circuit of Figure 1
290 350
mV
330 400
mV
400
mA
Shutdown Pin Current
LBI Threshold Voltage
VSHDN = 1.1V
VSHDN = 6V
VSHDN = 0V
l
2
5
μA
l
20
35
μA
0.01
0.1
μA
196
200
204
mV
l 193
200
207
mV
LBO Output Low
LBO Leakage Current
ISINK = 50μA
VLBI = 250mV, VLBO = 5V
l
0.1
0.25
V
l
0.01
0.1
μA
LBI Input Bias Current (Note 5)
Low-Battery Detector Gain
VLBI = 150mV
33
100
nA
3000
V/V
Switch Leakage Current
VSW = 5V
l
0.01
10
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 LT1308ACS8, LT1308ACF, LT1308BCS8 and LT1308BCF are
designed, characterized and expected to meet the industrial temperature
limits, but are not tested at –40°C and 85°C. I grade devices are
guaranteed over the –40°C to 85°C operating temperature range.
Note 3: Bias current flows into FB pin.
Note 4: Switch current limit guaranteed by design and/or correlation to
static tests. Duty cycle affects current limit due to ramp generator (see
Block Diagram).
Note 5: Bias current flows out of LBI pin.
Note 6: Connect the four GND pins (Pins 4–7) together at the device.
Similarly, connect the three SW pins (Pins 8–10) together and the two VIN
pins (Pins 11, 12) together at the device.
TYPICAL PERFORMANCE CHARACTERISTICS
LT1308B
3.3V Output Efficiency
95
90
VIN = 1.8V
VIN = 2.5V
85
80
75
VIN = 1.2V
70
65
60
55
50
1
10
100
LOAD CURRENT (mA)
1000
1308A/B G01
LT1308A
3.3V Output Efficiency
95
90
85
VIN = 1.8V
VIN = 2.5V
80
75
VIN = 1.2V
70
65
60
55
50
1
10
100
LOAD CURRENT (mA)
1000
1308A/B G02
4
LT1308A
5V Output Efficiency
95
90
VIN = 3.6V
85
VIN = 4.2V
80
75
VIN = 1.5V VIN = 2.5V
70
65
60
55
50
1
10
100
LOAD CURRENT (mA)
1000
1308A/B G03
1308abfb
Share Link: 