Datasheet

LTC3829
7
3829fa
For more information www.linear.com/LTC3829
TYPICAL PERFORMANCE CHARACTERISTICS
Maximum Current Sense Threshold
vs Common Mode Voltage
Maximum Current Sense Voltage
vs Duty Cycle
Maximum Current Sense Voltage
vs Feedback Voltage
(Current Foldback)
TK/SS Pull-Up Current
vs Temperature
V
SENSE
COMMON MODE VOLTAGE (V)
0
0
CURRENT SENSE THRESHOLD (mV)
10
30
40
50
2
4
5
90
3829 G11
20
1 3
60
70
80
I
LIM
= INTV
CC
I
LIM
= FLOAT
I
LIM
= GND
TEMPERATURE (°C)
–50
1.1
TK/SS CURRENT (µA)
1.2
1.3
1.4
1.5
–25 0 25 50
3829 G14
75 100 125
DUTY CYCLE (%)
0
MAXIMUM CURRENT SENSE VOLTAGE (mV)
60
80
100
80
3829 G12
40
20
50
70
90
30
10
0
2010
4030
60 70 90
50
100
I
LIM
= INTV
CC
I
LIM
= FLOAT
I
LIM
= GND
FEEDBACK VOLTAGE (V)
0
MAXIMUM CURRENT SENSE VOLTAGE (mV)
60
80
100
0.4 0.5
3829 G13
40
20
50
70
90
30
10
0
0.1
0.2
0.3
0.6
I
LIM
= INTV
CC
I
LIM
= FLOAT
I
LIM
= GND
Shutdown (RUN) Threshold
vs Temperature
TEMPERATURE (°C)
–50
1.0
RUN PIN VOLTAGE (V)
1.1
1.2
1.3
ON
OFF
1.4
–25 0 25 50
3829 G15
75 100 125
Regulated Feedback Voltage
vs Temperature
TEMPERATAURE (°C)
–50
V
FB
(V)
0.600
0.602
0.604
25 75
3829 G16
0.598
0.596
–25 0
50 100 125
0.594
0.592
Undervoltage Lockout Threshold
(INTV
CC
) vs Temperature
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–50
FREQUENCY (kHz)
600
700
25 75
3829 G17
500
400
–25 0
50 100 125
300
200
V
FREQ
≥ 2.4V
V
FREQ
= 1.2V
V
FREQ
= 0V
TEMPERATURE (°C)
–50
2.5
UVLO THRESHOLD (V)
2.7
3.1
3.3
3.5
50
4.3
3829 G18
2.9
0
–25
75 100
25 125
3.7
3.9
4.1
RISING
FALLING
Oscillator Frequency
vs Input Voltage
INPUT VOLTAGE (V)
0
0
FREQUENCY (kHz)
200
400
600
800
5 10 15 20
3829 G19
25 30 35 40
V
FREQ
≥ 2.4V
V
FREQ
= 1.2V
V
FREQ
= 0V