Datasheet

LT3505
5
3505fc
TYPICAL PERFORMANCE CHARACTERISTICS
Undervoltage Lockout Switching Frequency Frequency Foldback, R
T
= 75.0k
TEMPERATURE (°C)
UVLO (V)
3.60
3.80
4.00
3505 G10
3.40
3.20
3.50
3.70
3.90
3.30
3.10
3.00
–25–50
250
75 100 125
50
FB VOLTAGE (V)
0
0
R
T
PIN BIAS VOLTAGE (V)
0.1
0.2
0.3
0.4
0.2 0.4
0.6
0.8
3505 G12
0.5
0.6
0.1 0.3
0.5
0.7
T
A
= 25°C
Soft-Start SHDN Pin Current
Typical Minimum Input Voltage,
(V
OUT
= 5V, f
SW
= 750kHz)
SHDN PIN VOLTAGE (V)
0
0
SWITCH CURRENT LIMIT (A)
0.2
0.6
0.8
1.0
2.0
1.4
0.50 1 1.25
0.4
1.6
1.8
1.2
0.25 0.75 1.50 1.75 2
T
A
= 25°C
V
SHDN
(V)
0
I
SHDN
(µA)
30
40
50
16
3505 G14
20
10
25
35
45
15
5
0
42
86
12 14 18
10
20
T
A
= 25°C
LOAD CURRENT (mA)
1
6.0
INPUT VOLTAGE (V)
6.2
6.4
6.6
6.8
10 100 1000
3505 G15
5.8
5.6
5.4
5.2
7.0
7.2
TO START
TO RUN
T
A
= 25°C
Typical Minimum Input Voltage,
(V
OUT
= 3.3V, f
SW
= 750kHz)
LOAD CURRENT (mA)
1
4.3
INPUT VOLTAGE (V)
4.5
4.7
4.9
5.1
10 100 1000
4.1
3.9
3.7
3.5
5.3
5.5
TO START
T
A
= 25°C
TO RUN
Typical Minimum Input Voltage,
(V
OUT
= 3.3V, f
SW
= 2.2MHz)
LOAD CURRENT (mA)
1
3.5
INPUT VOLTAGE (V)
5.0
5.5
10 100 1000
4.5
4.0
TO START
TO RUN
T
A
= 25°C
Typical Minimum Input Voltage,
(V
OUT
= 5V, f
SW
= 2.2MHz)
LOAD CURRENT (mA)
1
5.0
INPUT VOLTAGE (V)
6.2
6.6
7.0
10 100 1000
5.8
5.4
6.0
6.4
6.8
5.6
5.2
TO START
TO RUN
T
A
= 25°C
TEMPERATURE (°C)
0
0.60
SWITCHING FREQUENCY (MHz)
0.80
1.20
1.40
1.60
100
2.40
1.00
50
25–50 –25
75 125
1.80
2.00
2.20
R
T
= 21k
R
T
= 30.1k
R
T
= 75.0k