Datasheet

6
LT3437
3437fc
ON-TIME (ns)
3437 G16
0
500
450
400
350
300
250
200
150
100
50
TEMPERATURE (°C)
–50 0 50 75–25 25 100 150125
LOAD CURRENT (mA)
100
6
BOOST CURRENT (mA)
8
12
11
200
400
3437 G17
7
10
9
300 500
INPUT VOLTAGE (V)
2.0
0
3.0
OUTPUT VOLTAGE (V)
0.5
1.5
2.0
2.5
4.0
4.0
3437 G18
1.0
3.0
2.5
3.5 4.5
3.5
V
OUT
= 3.3V
I
LOAD
= 250mA
BOOST DIODE =
DIODES INC B1100
Supply Current vs Input Voltage
Burst Mode Threshold
vs Input Voltage
Oscillator Frequency
vs FB Voltage Switch On Voltage (V
CESAT
)
LOAD CURRENT (mA)
0
VOLTAGE (mV)
200
600
500
200
400
500
3437 G12
100
400
300
100 300
T
J
= 125°C
T
J
= –40°C
T
J
= 25°C
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Minimum Input Voltage
FB VOLTAGE (V)
0
0
FREQUENCY (kHz)
50
100
150
0.25
0.50
0.75
3437 G11
1.00
200
250
1.25
INPUT VOLTAGE (V)
0
0
SUPPLY CURRENT (µA)
40
100
10 20 30 40
3437 F13
50
200
20
60
80
120
140
160
180
8060 70
V
OUT
= 3.3V
LOAD CURRENT (mA)
0
3.0
INPUT VOLTAGE (V)
3.5
4.5
5.0
5.5
400
7.5
3437 G14
4.0
200
100
300 500
6.0
6.5
7.0
5V TO RUN
5V TO START
3.3V TO RUN
3.3V TO START
INPUT VOLTAGE (V)
0
0
LOAD CURRENT (mA)
200
20
40
50
3437 G15
100
80
60
40
20
120
140
160
180
10 30 60
ENTER
EXIT
V
OUT
= 3.3V
Minimum On-Time Boost Current vs Load Current
Dropout Operation
FB VOLTAGE (V)
0
0
I
CSS
(µA)
10
20
30
0.2
0.4
0.6 0.8
3437 G10
1.0
35
5
15
25
1.2
SOFT-START DEFEATED
Soft-Start Current Threshold
vs FB Voltage