Datasheet

4
LT3503
3503f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Maximum Load Current
Switch Voltage Drop
Undervoltage Lockout
Switching Frequency
Frequency Foldback
Soft-Start
T
A
= 25°C unless otherwise noted.
SWITCH CURRENT (mA)
0
V
CE(SWITCH)
(mV)
300
400
500
1200
3503 G07
200
100
250
350
450
150
50
0
300
600
900
1500
T
A
= –45°C
T
A
= 85°C
T
A
= 25°C
TEMPERATURE (°C)
UVLO (V)
3.60
3.80
4.00
7555
3503 G08
3.40
3.20
3.50
3.70
3.90
3.30
3.10
3.00
–25–45
15–5
35
TEMPERATURE (°C)
–45
SWITCHING FREQUENCY (MHz)
2.25
2.50
3503 G09
2.00
1.75
–5
35
55
2.75
–25
15
75
FEEDBACK VOLTAGE (mV)
0
SWITCHING FREQUENCY (MHz)
1.5
2.0
2.5
300 500 800
3503 G10
1.0
0.5
0
100 200
400
600 700
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
3503 G11
0.4
1.6
1.8
1.2
0.25 0.75 1.50 1.75 2
INPUT VOLTAGE (V)
4
OUTPUT CURRENT (A)
1.0
1.2
1.4
12
3503 G03
0.8
0.6
0
6
8
10
5
7
9
11
0.2
0.4
1.8
1.6
TYPICAL
MINIMUM
V
OUT
= 3.3V
L = 2.2µH
INPUT VOLTAGE (V)
6
0
OUTPUT CURRENT (A)
0.2
0.6
0.8
1.0
12 13 14
1.8
3503 G04
0.4
9
7
10
8
11 15
1.2
1.4
1.6
TYPICAL
MINIMUM
V
OUT
= 5V
L = 3.3µH
Maximum Load Current