Datasheet

LTC3859AL
10
3859alf
For more information www.linear.com/3859AL
Typical perForMance characTerisTics
Buck Foldback Current Limit
Oscillator Frequency
vs Temperature
Undervoltage Lockout Threshold
vs Temperature
Shutdown (RUN) Threshold
vs Temperature
Charge Pump Charging Current
vs Operating Frequency
Charge Pump Charging Current
vs Switch Voltage
Shutdown Current vs Temperature
Shutdown Current
vs Input Voltage Quiescent Current vs Temperature
TEMPERATURE (°C)
–75
SHUTDOWN CURRENT (µA)
20
16
14
10
18
12
4
6
8
0 25 50 75 100 125 150–50
3859al G28
–25
V
BIAS
= 12V
V
BIAS
INPUT VOLTAGE (V)
5
SHUTDOWN CURRENT (µA)
25
20
15
5
10
0
20 25 30 35 4010
3859al G29
15
TEMPERATURE (°C)
–75
QUIESCENT CURRENT (µA)
80
50
60
70
0
10
20
30
40
0 25 50 75 100 125 150–50
3859al G30
–25
CHANNEL 1 ON
ALL CHANNELS ON
FEEDBACK VOLTAGE (mV)
0
MAXIMUM CURRENT SENSE VOLTAGE (mV)
70
60
50
20
10
30
40
65
55
45
15
5
25
35
0
300 400 500 600 700 800100
3859al G31
200
TEMPERATURE (°C)
–75
FREQUENCY (kHz)
600
550
500
350
400
450
300
0 25 50 75 100 125 150–50
3859al G32
–25
FREQ = INTV
CC
FREQ = GND
TEMPERATURE (°C)
–75
INTV
CC
VOLTAGE (V)
4.4
4.3
4.2
3.6
3.8
4.0
3.4
3.5
3.7
3.9
4.1
0 25 50 75 100 125 150–50
3859al G33
–25
RISING
FALLING
TEMPERATURE (°C)
–75
RUN PIN VOLTAGE (V)
1.40
1.35
1.30
1.20
1.00
1.15
1.10
1.05
1.25
0 25 50 75 100 125 150–50
3859al G34
–25
RUN1 RISING
RUN1 FALLING
RUN2,3 FALLING
RUN2,3 RISING
OPERATING FREQUENCY (kHz)
100
CHARGE PUMP CHARGING CURRENT (µA)
100
80
90
60
70
20
30
0
10
40
50
400 500 600 700 800200
3859al G35
300
–55°C
25°C
150°C
V
BOOST3
= 16V
V
SW3
= 12V
SWITCH VOLTAGE (V)
5
CHARGE PUMP CHARGING CURRENT (µA)
100
80
90
60
70
20
30
0
10
40
50
20 25 30 35 4010
3859al G36
FREQ = 0V
FREQ = INTV
CC
15
V
BOOST3
– V
SW3
= 4V