LT1513/LT1513-2
ELECTRICAL CHARACTERISTICS
VIN = 5V, VC = 0.6V, VFB = VREF, IFB = 0V, VSW and S/S pins open, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS
Error Amplifier Clamp Voltage
MIN
TYP
MAX
UNITS
High Clamp, V = 1V
1.70
0.25
1.95
0.40
2.30
0.52
V
V
FB
Low Clamp, V = 1.5V
FB
A
V
Error Amplifier Voltage Gain
500
1
V/V
V
V Pin Threshold
C
Duty Cycle = 0%
0.8
1.25
f
Switching Frequency
2.7V ≤ V ≤ 25V
450
430
400
500
500
550
580
580
kHz
kHz
kHz
IN
0°C ≤ T ≤ 125°C
J
T < 0°C
J
Maximum Switch Duty Cycle
●
●
85
95
130
47
%
Switch Current Limit Blanking Time
Output Switch Breakdown Voltage
260
ns
BV
0°C ≤ T ≤ 125°C
J
40
35
V
V
J
T < 0°C
V
SAT
Output Switch ON Resistance
Switch Current Limit
I
= 2A
SW
0.25
0.45
Ω
I
Duty Cycle = 50%
Duty Cycle = 80% (Note 1)
●
●
3.0
2.6
3.8
3.4
5.4
5.0
A
A
LIM
∆I /∆I
IN SW
Supply Current Increase During Switch ON Time
15
4
25
mA/A
A/V
Control Voltage to Switch Current
Transconductance
Minimum Input Voltage
Supply Current
●
●
●
2.4
4
2.7
5.5
V
I
2.7V ≤ V ≤ 25V
mA
Q
IN
Shutdown Supply Current
2.7V ≤ V ≤ 25V, V ≤ 0.6V, T ≥ 0°C
12
30
50
µA
µA
IN
S/S
J
T < 0°C
J
Shutdown Threshold
2.7V ≤ V ≤ 25V
●
●
●
●
0.6
5
1.3
12
2
V
µs
IN
Shutdown Delay
25
S/S Pin Input Current
Synchronization Frequency Range
0V ≤ V ≤ 5V
–10
600
15
µA
S/S
800
kHz
Note 2: The I pin is servoed to its regulating state with V = 0.8V.
Note 3: Consult factory for grade selected parts.
The
●
denotes specifications which apply over the full operating
FB
C
temperature range.
Note 1: For duty cycles (DC) between 50% and 85%, minimum
Note 4: The I pin is sevoed to regulate FB to 1.245V
FB
guaranteed switch current is given by I = 1.33 (2.75 – DC).
LIM
3
Linear [ Linear ]
