LT1512C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1512C' PDF : 12 Pages View PDF
LT1512
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, IFB = 0V, VSW and S/S pins open, unless otherwise noted.
SYMBOL
VSAT
ILIM
∆IIN
∆ISW
IQ
PARAMETER
Output Switch ON Resistance
Switch Current Limit
Supply Current Increase During Switch ON Time
Control Voltage to Switch Current
Transconductance
Minimum Input Voltage
Supply Current
Shutdown Supply Current
Shutdown Threshold
Shutdown Delay
S/S Pin Input Current
Synchronization Frequency Range
CONDITIONS
ISW = 2A
Duty Cycle = 50%
Duty Cycle = 80% (Note 1)
2.7V ≤ VIN ≤ 25V
2.7V ≤ VIN ≤ 25V, VS/S ≤ 0.6V
0°C ≤ TJ ≤ 125°C
– 40°C ≤ TJ ≤ 0°C (LT1512I)
2.7V ≤ VIN ≤ 25V
0V ≤ VS/S ≤ 5V
MIN
q
q 1.5
q 1.3
q
q
q
q 0.6
q5
q – 10
q 600
TYP
MAX UNITS
0.5
0.8
Ω
1.9
2.7
A
1.7
2.5
A
15
25
mA/A
2
A/ V
2.4
2.7
V
4
5.5
mA
12
30
µA
50
µA
1.3
2
V
12
25
µs
15
µA
800
kHz
The q denotes specifications which apply over the full operating
temperature range.
Note 1: For duty cycles (DC) between 50% and 85%, minimum
guaranteed switch current is given by ILIM = 0.667 (2.75 – DC).
Note 2: The IFB pin is servoed to its regulating state with VC = 0.8V.
Note 3: 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 specifications over
the ambient temperature range – 40°C to 85°C are available as industrial
parts with an “I” suffix.
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.
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage
vs Switch Current
1.0
150°C
0.9
100°C
25°C
0.8
0.7
0.6
0.5
–55°C
0.4
0.3
0.2
0.1
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
SWITCH CURRENT (A)
1512 G01
Switch Current Limit
vs Duty Cycle
3.0
2.5
25°C AND
2.0
125°C
–55°C
1.5
1.0
0.5
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
1512 G02
Minimum Input Voltage
vs Temperature
3.0
2.8
2.6
2.4
2.2
2.0
1.8
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
1512 G03
3
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