Datasheet

LTC3859
9
3859fa
TYPICAL PERFORMANCE CHARACTERISTICS
SENSE Pins Total Input Current
vs V
SENSE
Voltage
Buck SENSE Pins Total Input
Current vs Temperature
Boost SENSE Pin Total Input
Current vs Temperature
Maximum Current Sense
Threshold vs Duty Cycle
Maximum Current Sense
Threshold vs I
TH
Voltage
Soft-Start Pull-Up Current
vs Temperature
INTV
CC
Line Regulation
INTV
CC
and EXTV
CC
vs Load Current
EXTV
CC
Switchover and INTV
CC
Voltages vs Temperature
INPUT VOLTAGE (V)
0
INTV
CC
VOLTAGE (V)
5.5
5.4
5.2
5.3
5.1
5.0
15 20 25 30 35 405
3859 G19
10
LOAD CURRENT (mA)
0
INTV
CC
VOLTAGE (V)
5.50
5.40
5.45
5.25
5.30
5.35
5.20
5.15
60 80 100 120 140 160 180 20020
3859 G20
40
V
BIAS
= 12V
EXTV
CC
= 8.5V
EXTV
CC
= 0V
TEMPERATURE (°C)
–45
EXTV
CC
AND INTV
CC
VOLTAGE (V)
6.0
5.8
5.4
5.2
4.4
4.2
4.6
4.8
5.6
5.0
4.0
30 55 80 105 130–20
3859 G21
5
INTV
CC
EXTV
CC
RISING
EXTV
CC
FALLING
V
SENSE
COMMON MODE VOLTAGE (V)
0
SENSE CURRENT (µA)
800
700
400
500
300
100
200
600
0
15 20 25 30 35 405
3859 G22
10
SENSE1, 2 PINS
SENSE3 PIN
TEMPERATURE (°C)
–45
SENSE CURRENT (µA)
900
700
800
400
500
300
100
200
600
0
30 35 55 80 105 130–20
3859 G23
5
V
OUT
= 28V
V
OUT
= 3.3V
TEMPERATURE (°C)
–45
SENSE CURRENT (µA)
200
160
180
100
120
80
40
20
60
140
0
30 35 55 80 105 130–20
3859 G24
5
SENSE3
+
PIN
SENSE3
–
PIN
DUTY CYCLE (%)
0
MAXIMUM CURRENT SENSE VOLTAGE (mV)
80
60
70
30
40
20
10
50
0
50 60 70 80 90 10010
3859 G25
20 30 40
BOOST
BUCK
I
TH
(V)
0
MAXIMUM CURRENT SENSE VOLTAGE (mV)
60
40
50
–10
0
–20
30
20
10
–30
1 1.2 1.40.2
3859 G26
0.4 0.6 0.8
Burst Mode OPERATION
PULSE-SKIPPING
FORCED CONTINUOUS
TEMPERATURE (°C)
–45
SS CURRENT (µA)
1.20
1.15
1.05
1.00
0.85
0.90
1.10
0.95
0.80
30 55 80 105 130–20
3859 G27
5