Datasheet

LT3505
4
3505fc
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency (V
OUT
= 5V, L = 10µH,
f
SW
= 750kHz)
Effi ciency (V
OUT
= 3.3V, L = 10µH,
f
SW
= 750kHz)
Effi ciency (V
OUT
= 3.3V,
L = 4.7µH, f
SW
= 2.2MHz)
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
55
65
70
75
0.8 1.0
95
60
0.2 0.4 0.6 1.2
80
85
90
V
IN
= 8V
V
IN
= 12V
V
IN
= 24V
T
A
= 25°C
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
55
65
70
75
0.8 1.0
95
60
0.2 0.4 0.6 1.2
80
85
90
V
IN
= 8V
V
IN
= 12V
V
IN
= 24V
T
A
= 25°C
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
55
65
70
75
0.8 1.0
95
60
0.2 0.4 0.6 1.2
80
85
90
V
IN
= 8V
V
IN
= 12V
T
A
= 25°C
Effi ciency (V
OUT
= 5V, L = 4.7µH,
f
SW
= 2.2MHz)
LOAD CURRENT (A)
0
50
EFFICIENCY (%)
55
65
70
75
0.8 1.0
95
60
0.2 0.4 0.6 1.2
80
85
90
V
IN
= 8V
V
IN
= 12V
T
A
= 25°C
Max Load Current (V
OUT
= 3.3V,
L = 6.8µH, f
SW
= 750kHz)
INPUT VOLTAGE (V)
5
OUTPUT CURRENT (A)
1.2
1.3
1.4
19
3505 G05
1.1
1.0
0.8
9
13
7
11
1715
0.9
1.7
1.6
1.5
TYPICAL
MINIMUM
T
A
= 25°C
*10% DROPOUT
Max Load Current (V
OUT
= 5V,
f
SW
= 750kHz)
INPUT VOLTAGE (V)
6
0.8
OUTPUT CURRENT (A)
0.9
1.1
1.2
1.3
22
1.7
3505 G06
1.0
14
10
26
18
8
24
16
12
28
20 30
1.4
1.5
1.6
TYPICAL, L = 22µH
TYPICAL, L = 10µH
MINIMUM, L = 10µH
T
A
= 25°C
*10% DROPOUT
Max Load Current (V
OUT
= 3.3V,
L = 2.2µH, f
SW
= 2.2MHz)
INPUT VOLTAGE (V)
5
0.8
OUTPUT CURRENT (A)
0.9
1.1
1.2
1.3
1.8
1.5
7
9
10
3505 G07
1.0
1.6
1.7
1.4
6
8
11
12
TYPICAL
MINIMUM
T
A
= 25°C
*10% DROPOUT
Max Load Current (V
OUT
= 5V,
L = 3.3µH, f
SW
= 2.2MHz)
INPUT VOLTAGE (V)
7
0.80
OUTPUT CURRENT (A)
0.90
1.10
1.20
1.30
1.80
1.50
9
11
12
3505 G08
1.00
1.60
1.70
1.40
8 10
14
16
18
TYPICAL
MINIMUM
T
A
= 25°C
*10% DROPOUT
Switch Voltage Drop
SWITCH CURRENT (mA)
0
V
CE(SWITCH)
(mV)
300
400
500
1200
3505 G09
200
100
250
350
450
150
50
0
300
600
900
1500
T
A
= –45°C
T
A
= 85°C
T
A
= 25°C