LTC3879_15 Datasheet, PDF (7/28 Pages) Linear Technology – Fast, Wide Operating Range No RSENSE Step-Down Controller

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3879
Error Amplifier g_m vs Temperature
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
–50
0
50
100
TEMPERATURE (°C)
3879 G18
Shutdown Current
vs Input Voltage
35
30
25
20
15
10
5
10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3879 G19
Quiescent Current vs INTV_CC
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
4.0 4.5 5.0 5.5 6.0 6.5 7.0
INTV_CC (V)
3879 G20
INTV_CC Load Regulation
0
–0.2
V_IN = 12V
–0.4
–0.6
–0.8
–1.0
–1.2
–1.4
–1.6
–1.8
–2.0
0
10
20
30
40
INTV_CC LOAD CURRENT (mA)
50
3879 G21
INTV_CC Dropout
0
–200
V_IN = 4.5V
–400
–600
–800
–1000
–1200
0
10
20
30
40
INTV_CC LOAD CURRENT (mA)
50
3879 G22
INTV_CC vs INTV_CC I_LOAD
6
5
INTV_CC
4
I_LOAD
FALLING
INTV_CC
I_LOAD
RISING
3
DO NOT EXCEED ≥50mA
CONTINUOUS
2
V_IN = 18V
I_LIMIT = 150mA,
1
INTV_CC > 0.7V
I_LIMIT = 22mA,
INTV_CC < 0.7V
0
0
50
100
150
200
I_LOAD (mA)
3879 G23
TRACK/SS Pin Current
vs Temperature
1.4
V_IN = 12V
V_OUT = 1.2V
MODE = INTV_CC
1.2
Feedback Reference Voltage
vs Temperature
0.606
0.604
0.602
1.0
0.600
0.598
0.8
0.596
0.6
–50
0
50
TEMPERATURE (°C)
100
3879 G24
0.594
–50 –30 –10 10 30 50 70 90 110
TEMPERATURE (°C)
3879 G25
3879f
7