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LT1512I Datasheet

  • LT1512I

  • Linear Technology [SEPIC Constant-Current/ Constant-Voltage...

  • 264.16KB

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LT1512
ELECTRICAL CHARACTERISTICS
V
IN
= 5V, V
C
= 0.6V, V
FB
= V
REF
, I
FB
= 0V, V
SW
and S/S pins open, unless otherwise noted.
SYMBOL
V
SAT
I
LIM
鈭咺
IN
鈭咺
SW
PARAMETER
Output Switch ON Resistance
Switch Current Limit
Supply Current Increase During Switch ON Time
Control Voltage to Switch Current
Transconductance
Minimum Input Voltage
I
Q
Supply Current
Shutdown Supply Current
2.7V
鈮?/div>
V
IN
鈮?/div>
25V
2.7V
鈮?/div>
V
IN
鈮?/div>
25V, V
S/S
鈮?/div>
0.6V
0擄C
鈮?/div>
T
J
鈮?/div>
125擄C
鈥?40擄C
鈮?/div>
T
J
鈮?/div>
0擄C (LT1512I)
2.7V
鈮?/div>
V
IN
鈮?/div>
25V
0V
鈮?/div>
V
S/S
鈮?/div>
5V
q
q
q
q
q
q
q
CONDITIONS
I
SW
= 2A
Duty Cycle = 50%
Duty Cycle = 80% (Note 1)
q
q
q
MIN
1.5
1.3
TYP
0.5
1.9
1.7
15
2
2.4
4
12
MAX
0.8
2.7
2.5
25
UNITS
鈩?/div>
A
A
mA/A
A/V
2.7
5.5
30
50
2
25
15
800
V
mA
碌A
碌A
V
碌s
碌A
kHz
Shutdown Threshold
Shutdown Delay
S/S Pin Input Current
Synchronization Frequency Range
0.6
5
鈥?10
600
1.3
12
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 I
LIM
= 0.667 (2.75 鈥?DC).
Note 2:
The I
FB
pin is servoed to its regulating state with V
C
= 0.8V.
Note 3:
Commercial devices are guaranteed over 0擄C to 125擄C junction
temperature range and 0擄C to 70擄C ambient temperature range. These
parts are also designed, characterized and expected to operate over the
鈥?20擄C to 85擄C extended ambient temperature range, but are not tested at
鈥?20擄C or 85擄C. Devices with full guaranteed electrical specifications over
the ambient temperature range 鈥?40擄C to 85擄C are available as industrial
parts with an 鈥淚鈥?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擄C limit. With high power dissipation, maximum ambient
temperature may be less than 70擄C.
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage
vs Switch Current
1.0
SWITCH SATURATION VOLTAGE (V)
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
150擄C
100擄C
SWITCH CURRENT LIMIT (A)
2.0
鈥?5擄C
1.5
1.0
0.5
0
INPUT VOLTAGE (V)
鈥?5擄C
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
U W
25擄C
Switch Current Limit
vs Duty Cycle
3.0
2.5
25擄C AND
125擄C
3.0
2.8
2.6
2.4
2.2
2.0
Minimum Input Voltage
vs Temperature
0
10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
1512 G02
1.8
鈥?0 鈥?5
0
25 50 75 100 125 150
TEMPERATURE (擄C)
1512 G03
3

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