LT3505
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency (V
OUT
= 5V, L = 10µH,
f
SW
= 750kHz)
95
90
85
EFFICIENCY (%)
EFFICIENCY (%)
80
75
70
65
60
55
50
0
0.2
0.4
0.6
0.8
LOAD CURRENT (A)
V
IN
= 8V
V
IN
= 12V
V
IN
= 24V
1.0
1.2
T
A
= 25°C
95
90
85
EFFICIENCY (%)
80
75
70
65
60
55
50
0
0.2
0.4
0.6
0.8
LOAD CURRENT (A)
V
IN
= 8V
V
IN
= 12V
V
IN
= 24V
1.0
1.2
Efficiency (V
OUT
= 3.3V, L = 10µH,
f
SW
= 750kHz)
T
A
= 25°C
95
90
85
80
75
70
65
60
55
50
Efficiency (V
OUT
= 3.3V,
L = 4.7µH, f
SW
= 2.2MHz)
T
A
= 25°C
V
IN
= 8V
V
IN
= 12V
0
0.2
0.4
0.6
0.8
LOAD CURRENT (A)
1.0
1.2
Efficiency (V
OUT
= 5V, L = 4.7µH,
f
SW
= 2.2MHz)
95
90
85
EFFICIENCY (%)
80
75
70
65
60
55
50
0
0.2
0.4
0.6
0.8
LOAD CURRENT (A)
V
IN
= 8V
V
IN
= 12V
1.0
1.2
T
A
= 25°C
1.7
1.6
OUTPUT CURRENT (A)
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
Max Load Current (V
OUT
= 3.3V,
L = 6.8µH, f
SW
= 750kHz)
T
A
= 25°C
TYPICAL
OUTPUT CURRENT (A)
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
5
7
9
15
INPUT VOLTAGE (V)
11
13
17
19
3505 G05
Max Load Current (V
OUT
= 5V,
f
SW
= 750kHz)
T
A
= 25°C
TYPICAL, L = 22µH
TYPICAL, L = 10µH
MINIMUM
MINIMUM, L = 10µH
*10% DROPOUT
*10% DROPOUT
0.8
6
8 10 12 14 16 18 20 22 24 26 28 30
INPUT VOLTAGE (V)
3505 G06
Max Load Current (V
OUT
= 3.3V,
L = 2.2µH, f
SW
= 2.2MHz)
1.8
1.7
1.6
OUTPUT CURRENT (A)
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
5
6
*10% DROPOUT
MINIMUM
T
A
= 25°C
1.80
1.70
OUTPUT CURRENT (A)
TYPICAL
1.60
Max Load Current (V
OUT
= 5V,
L = 3.3µH, f
SW
= 2.2MHz)
T
A
= 25°C
500
450
400
V
CE(SWITCH)
(mV)
TYPICAL
350
300
250
200
150
100
50
16
18
0
Switch Voltage Drop
1.50
1.40
1.30
1.20
1.10
1.00
0.90
T
A
= 85°C
T
A
= 25°C
T
A
= –45°C
MINIMUM
*10% DROPOUT
9
8
7
10
INPUT VOLTAGE (V)
11
12
0.80
7
8
9
10 11 12 14
INPUT VOLTAGE (V)
0
300
900
1200
600
SWITCH CURRENT (mA)
1500
3505 G09
3505 G07
3505 G08
3505fc
4
LINER [ LINEAR TECHNOLOGY ]
