Datasheet

LTC3812-5
6
38125fc
TYPICAL PERFORMANCE CHARACTERISTICS
On-Time vs Temperature Current Limit Foldback
Maximum Current Sense
Threshold vs V
RNG
Voltage
Maximum Current Sense
Threshold vs Temperature
Reference Voltage
vs Temperature
Driver Peak Source Current
vs Temperature
TEMPERATURE (°C)
–50
ON-TIME (ns)
640
660
680
25 75
38125 G13
620
600
–25 0
50 100 125
580
560
I
ON
= 300μA
V
FB
(V)
0
MAXIMUM CURRENT SENSE THRESHOLD (mV)
100
150
0.8
38125 G14
50
0
0.2
0.4
0.6
250
200
V
RNG
= INTV
CC
V
RNG
VOLTAGE (V)
0.5
MAXIMUM CURRENT SENSE THRESHOLD (mV)
200
38125 G15
100
0
1 1.5
300
400
2
TEMPERATURE (°C)
–50 –25
180
MAXIMUM CURRENT SENSE THRESHOLD (mV)
200
230
0
50
75
38125 G16
190
220
210
25
100
125
V
RNG
= INTV
CC
TEMPERATURE (°C)
–50 –25
0.797
REFERENCE VOLTAGE (V)
0.799
0.803
0.802
0
50
75
38125 G17
0.798
0.801
0.800
25
100
125
TEMPERATURE (°C)
–50
0.5
PEAK SOURCE CURRENT (A)
1.0
1.5
–25 0 25 50
38125 G18
75 100 125
V
BOOST
= V
INTVCC
= 5V
Current Sense Threshold
vs I
TH
Voltage
On-Time vs I
ON
CurrentI
TH
Voltage vs Load Current
LOAD CURRENT (A)
01
0
I
TH
VOLTAGE (V)
1.0
3.0
2.5
2
4
5
38125 G10
0.5
2.0
1.5
3
6
7
V
RNG
= 1V
FRONT PAGE CIRCUIT
I
TH
VOLTAGE (V)
0
–400
CURRENT SENSE THRESHOLD (mV)
–200
–300
–100
0
100
200
400
0.5
1 1.5 2
38125 G11
2.5 3
300
V
RNG
= 2V
1.4V
1V
0.7V
0.5V
I
ON
CURRENT (μA)
10
10
ON-TIME (ns)
100
1000
10000
100 1000 10000
38125 G12
V
ON
= INTV
CC