參數(shù)資料
型號(hào)： LT1308BCF#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 4.5 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO14
封裝： 4.40 MM, LEAD FREE, PLASTIC, TSSOP-14
文件頁(yè)數(shù)： 15/20頁(yè)
文件大?。?/td> 367K
代理商： LT1308BCF#TRPBF
LT1308A/LT1308B
4
1308abfb
ELECTRICAL CHARACTERISTICS
LT1308B
3.3V Output Efciency
LT1308A
3.3V Output Efciency
LT1308A
5V Output Efciency
The
l denotes the specications which apply over the full operating temperature
range, otherwise specications 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
l
500
600
750
kHz
Maximum Duty Cycle
l
82
90
%
Switch Current Limit
Duty Cycle = 30% (Note 4)
2
3
4.5
A
Switch VCESAT
ISW = 2A (25°C, – 40°C), VIN = 1.5V
ISW = 2A (85°C), VIN = 1.5V
290
330
350
400
mV
Burst Mode Operation Switch Current Limit
(LT1308A)
VIN = 2.5V, Circuit of Figure 1
400
mA
Shutdown Pin Current
VSHDN = 1.1V
VSHDN = 6V
VSHDN = 0V
l
2
20
0.01
5
35
0.1
μA
LBI Threshold Voltage
l
196
193
200
204
207
mV
LBO Output Low
ISINK = 50μA
l
0.1
0.25
V
LBO Leakage Current
VLBI = 250mV, VLBO = 5V
l
0.01
0.1
μA
LBI Input Bias Current (Note 5)
VLBI = 150mV
33
100
nA
Low-Battery Detector Gain
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 ows 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 ows 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
LOAD CURRENT (mA)
95
90
85
80
75
70
65
60
55
50
1
100
1000
1308A/B G01
10
EFFICIENCY
(%)
VIN = 1.8V
VIN = 2.5V
VIN = 1.2V
LOAD CURRENT (mA)
95
90
85
80
75
70
65
60
55
50
1
100
1000
1308A/B G02
10
EFFICIENCY
(%)
VIN = 1.8V
VIN = 2.5V
VIN = 1.2V
LOAD CURRENT (mA)
1
EFFICIENCY
(%)
95
90
85
80
75
70
65
60
55
50
10
100
1000
1308A/B G03
VIN = 4.2V
VIN = 2.5V
VIN = 3.6V
VIN = 1.5V
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