LTC3859 Linear Technology, LTC3859 Datasheet - Page 9

• Manufacturer Part Number: LTC3859
• Description: Buck/Buck/Boost Synchronous Controller
• Manufacturer: Linear Technology

TYPICAL PERFORMANCE CHARACTERISTICS
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
22
20
18
16
14
12
10
70
65
60
55
50
45
40
35
30
25
20
15
10
8
5
0
–45
–45
0
Shutdown Current vs Temperature
Buck Foldback Current Limit
Shutdown (RUN) Threshold
vs Temperature
RUN2,3 FALLING
100
RUN1 FALLING
–20
–20
200
FEEDBACK VOLTAGE (mV)
5
5
TEMPERATURE (°C)
TEMPERATURE (°C)
300 400 500 600 700 800
30
30
55
55
RUN2,3 RISING
RUN1 RISING
80
80
105
105
3859 G28
3859 G34
3859 G31
130
130
600
550
500
450
400
350
300
100
25
20
15
10
90
80
70
60
50
40
30
20
10
5
0
0
–45
100
5
Shutdown Current
vs Input Voltage
Oscillator Frequency
vs Temperature
Charge Pump Charging Current
vs Operating Frequency
V
V
BOOST3
SW3
200
–20
10
= 12V
OPERATING FREQUENCY (kHz)
= 16V
300
15
5
INPUT VOLTAGE (V)
TEMPERATURE (°C)
400
20
30
FREQ = INTV
FREQ = GND
500
25
55
25°C
600
30
80
–45°C
130°C
CC
700
105
35
3859 G29
3859 G32
3859 G35
130
800
40
100
100
4.4
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
90
80
70
60
50
40
90
80
70
60
50
40
30
20
10
0
–45
–45
5
Quiescent Current vs Temperature
Undervoltage Lockout Threshold
vs Temperature
Charge Pump Charging Current
vs Switch Voltage
V
BOOST3
–20
–20
ALL CHANNELS ON
10
– V
15
SWITCH VOLTAGE (V)
5
5
SW3
TEMPERATURE (°C)
TEMPERATURE (°C)
= 4V
FALLING
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RISING
30
20
30
ONE CHANNEL ON
LTC3859
55
55
25
FREQ = INTV
FREQ = 0V
80
30
80
105
105
35
3859 G30
3859 G33
3859 G36
CC
9
3859f
130
130
40