LTC3859AL Datasheet, PDF (10/44 Pages) Linear Technology – Triple Output, Buck/Buck/Boost Synchronous Controller with 28μA Burst Mode IQ

LTC3859AL
Typical Performance Characteristics
Shutdown Current vs Temperature
20
V_BIAS = 12V
18
16
14
12
10
8
6
4
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3859al G28
Buck Foldback Current Limit
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0 100 200 300 400 500 600 700 800
FEEDBACK VOLTAGE (mV)
3859al G31
Shutdown (RUN) Threshold
vs Temperature
1.40
1.35
1.30
RUN2,3 RISING
1.25
RUN1 RISING
1.20
RUN2,3 FALLING
1.15
RUN1 FALLING
1.10
1.05
1.00
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3859al G34
Shutdown Current
vs Input Voltage
25
20
15
10
5
0
5 10 15 20 25 30 35 40
V_BIAS INPUT VOLTAGE (V)
3859al G29
Oscillator Frequency
vs Temperature
600
550
FREQ = INTV_CC
500
450
400
FREQ = GND
350
300
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3859al G32
Charge Pump Charging Current
vs Operating Frequency
100
V_BOOST3 = 16V
90 _{VSW3 = 12V}
80
–55°C
70
25°C
60
50
40
150°C
30
20
10
0
100 200 300 400 500 600 700 800
OPERATING FREQUENCY (kHz)
3859al G35
10
For more information www.linear.com/3859AL
Quiescent Current vs Temperature
80
70
60
50
ALL CHANNELS ON
40
30
CHANNEL 1 ON
20
10
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3859al G30
Undervoltage Lockout Threshold
vs Temperature
4.4
4.3
4.2
RISING
4.1
4.0
3.9
FALLING
3.8
3.7
3.6
3.5
3.4
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3859al G33
Charge Pump Charging Current
vs Switch Voltage
100
V_BOOST3 – V_SW3 = 4V
90
80
FREQ = 0V
70
60
FREQ = INTV_CC
50
40
30
20
10
0
5 10 15 20 25 30 35 40
SWITCH VOLTAGE (V)
3859al G36
3859alf