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参数资料
型号： LT1512IN8#TR
厂商： LINEAR TECHNOLOGY CORP
元件分类： 稳压器
英文描述： 2.7 A BATTERY CHARGE CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDIP8
封装： 0.300 INCH, PLASTIC, DIP-8
文件页数： 6/12页
文件大小： 143K
代理商： LT1512IN8#TR
LT1512
3
1512fa
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: Commercial devices are guaranteed over 0°C to 125°C junction
temperature range and 0°C to 70°C ambient temperature range. These
parts are also designed, characterized and expected to operate over the
–20°C to 85°C extended ambient temperature range, but are not tested at
–20°C or 85°C. Devices with full guaranteed electrical specications over
the ambient temperature range –40°C to 85°C are available as industrial
parts with an “I” sufx.
ELECTRICAL CHARACTERISTICS The l denotes the specications which apply over the full operating
temperature range, otherwise specications are at TA = 25°C. VIN = 5V, VC = 0.6V, VFB = VREF, IFB = 0V, VSW and S/S pins open,
unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIREF
IFB Reference Voltage
Measured at IFB Pin
VFB = 0V, VC = 0.8V
l
–107
–110
–100
–93
–90
mV
IFB Input Current
VIFB = VIREF (Note 3)
l
10
25
35
μA
IFB Reference Voltage Line Regulation
2.7V ≤ VIN ≤ 25V, VC = 0.8V
l
0.01
0.05
%/V
gm
Error Amplier Transconductance
ΔIC = ±25μA
l
1100
700
1500
1900
2300
μmho
Error Amplier Source Current
VFB = VREF – 150mV, VC = 1.5V
l
120
200
350
μA
Error Amplier Sink Current
VFB = VREF + 150mV, VC = 1.5V
l
1400
2400
μA
Error Amplier Clamp Voltage
High Clamp, VFB = 1V
Low Clamp, VFB = 1.5V
1.70
0.25
1.95
0.40
2.30
0.52
V
AV
Error Amplier Voltage Gain
500
V/V
VC Pin Threshold
Duty Cycle = 0%
0.8
1
1.25
V
f
Switching Frequency
2.7V ≤ VIN ≤ 25V
0°C ≤ TJ ≤ 125°C
–40°C ≤ TJ < 0°C (LT1512I)
l
450
430
400
500
550
580
kHz
Maximum Switch Duty Cycle
l
85
95
%
Switch Current Limit Blanking Time
130
260
ns
BV
Output Switch Breakdown Voltage
0°C ≤ TJ ≤ 125°C
–40°C ≤ TJ < 20°C (LT1512I)
l
40
35
47
V
VSAT
Output Switch ON Resistance
ISW = 2A
l
0.5
0.8
Ω
ILIM
Switch Current Limit
Duty Cycle = 50%
Duty Cycle = 80% (Note 4)
l
1.5
1.3
1.9
1.7
2.7
2.5
A
ΔIIN
ΔISW
Supply Current Increase During Switch ON Time
15
25
mA/A
Control Voltage to Switch Current Transconductance
2
A/V
Minimum Input Voltage
l
2.4
2.7
V
IQ
Supply Current
2.7V ≤ VIN ≤ 25V
l
4
5.5
mA
Shutdown Supply Current
2.7V ≤ VIN ≤ 25V, VS/S ≤ 0.6V
0°C ≤ TJ ≤ 125°C
–40°C ≤ TJ ≤ 0°C (LT1512I)
l
12
30
50
μA
Shutdown Threshold
2.7V ≤ VIN ≤ 25V
l
0.6
1.3
2
V
Shutdown Delay
l
512
25
μs
S/S Pin Input Current
0V ≤ VS/S ≤ 5V
l
–10
15
μA
Synchronization Frequency Range
l
600
800
kHz
Maximum allowable ambient temperature may be limited by power
dissipation. Parts may not necessarily be operated simultaneously
at maximum power dissipation and maximum ambient temperature.
Temperature rise calculations must be done as shown in the Applications
Information section to ensure that maximum junction temperature does
not exceed 125°C limit. With high power dissipation, maximum ambient
temperature may be less than 70°C.
Note 3: The IFB pin is servoed to its regulating state with VC = 0.8V.
Note 4: For duty cycles (DC) between 50% and 85%, minimum guaranteed
switch current is given by ILIM = 0.667 (2.75 – DC).
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