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