Datasheet

LT3500
6
3500fc
Boost Current vs Switch Current
Minimum Boost Voltages
vs Temperature Minimum Input Voltage
SWITCH CURRENT (A)
0
BOOST CURRENT (mA)
30
40
50
1.6
3500 G19
20
10
25
35
45
15
5
0
0.40.2
0.80.6
1.2 1.4 1.8
1.0
2.0
150°C
25°C
–50°C
TEMPERATURE (°C)
–50
1.5
BOOST VOLTAGE (V)
1.7
1.9
2.1
2.3
050
100
150
3500 G20
2.5
2.7
–25 25
75
125
MINIMUM BOOST FOR
SWITCH SATURATION
LOAD CURRENT (A)
0
INPUT VOLTAGE (V)
8
7
6
5
4
3
2
1
0
1.6
3500 G21
0.4 0.8 1.2 2.01.40.2 0.6 1.0 1.8
V
OUT1
= 5V
V
OUT1
= 3.3V
T
A
= 25°C
f
SW
= 1MHz
L = 3.3µH
TYPICAL PERFORMANCE CHARACTERISTICS
Peak Switch Current
vs Temperature
LDRV Short-Circuit Current
vs Temperature
External Sync Duty Cycle Range
vs External Sync Frequency
Minimum Switching Times Frequency vs R
RT/SYNC
Switch Saturation Voltage
vs Switch Current
TEMPERATURE (°C)
–50
2.5
CURRENT (A)
2.6
2.8
2.9
3.0
3.5
3.2
0
50
75
3500 G13
2.7
3.3
3.4
3.1
–25
25
100
150125
MSE PACKAGE
DD PACKAGE
TEMPERATURE (°C)
–50
10
CURRENT (mA)
11
13
14
15
20
17
0
50
75
3500 G14
12
18
19
16
–25
25
100
150125
SYNCHRONIZATION FREQUENCY (kHz)
250
0
DUTY CYCLE (%)
10
30
40
50
100
70
750
1250
3500 G15
20
80
90
60
1750
2250
MINIMUM DUTY CYCLE
MAXIMUM DUTY CYCLE
T
A
= 25°C
TEMPERATURE (°C)
–50
50
TIME (ns)
75
125
150
175
300
225
0
50
75
3500 G16
100
250
275
200
–25 25
100
125
150
MINIMUM ON TIME
MINIMUM OFF TIME
R
RT/SYNC
(kΩ)
0
FREQUENCY (kHz)
1500
2000
2500
160
3500 G17
1000
500
1250
1750
2250
750
250
0
4020
8060
120 140 180
100
200
T
A
= 25°C
SWITCH CURRENT (A)
0
SWITCH SATURATION VOLTAGE (mV)
200
400
600
100
300
500
0.4 0.8 1.2 1.6
3500 G18
2.00.20 0.6 1.0 1.4 1.8
–50°C
150°C
25°C