Datasheet

LTC3878
6
3878fa
Typical perForMance characTerisTics
Error Amplifier g
m
vs Temperature
Shutdown Current
vs Input Voltage
Quiescent Current vs INTV
CC
INTV
CC
Load Regulation INTV
CC
Dropout INTV
CC
vs INTV
CC
I
LOAD
Efficiency: LTC3878 vs LTC1778
RUN/SS Pin Current vs
Temperature
INPUT VOLTAGE (V)
5 10
10
INPUT CURRENT (µA)
20
35
15
25
30
3878 G20
15
30
25
20
35
40
INTV
CC
LOAD CURRENT (mA)
0
$INTV
CC
(%)
–0.8
–0.4
0
40
3878 G22
–1.2
–1.6
–1.0
–0.6
–0.2
–1.4
–1.8
–2.0
10
20
30
50
V
IN
= 12V
INTV
CC
LOAD CURRENT (mA)
0
–1200
INTV
CC
DROPOUT VOLTAGE (mV)
–1000
–800
–600
–400
–200
0
10 20 30 40
3878 G23
50
V
IN
= 4.5V
TEMPERATURE (°C)
–50
1.0
g
m
(mS)
1.1
1.3
1.4
1.5
2.0
1.7
0
50
3878 G19
1.2
1.8
1.9
1.6
100
INTV
CC
(V)
4.0
QUIESCENT CURRENT (mA)
1.5
2.0
2.5
5.5
6.5
3878 G21
1.0
0.5
0
4.5 5.0 6.0
3.0
3.5
4.0
7.0
I
LOAD
(mA)
0
1
0
INTV
CC
(V)
2
3
4
5
6
50 100 150 200
3878 G24
INTV
CC
I
LOAD
RISING
INTV
CC
I
LOAD
FALLING
DO NOT EXCEED ≥50mA
CONTINUOUS
I
LIMIT
= 150mA,
INTV
CC
> 0.7V
I
LIMIT
= 22mA,
INTV
CC
< 0.7V
V
IN
= 12V
LOAD CURRENT (A)
0
90
92
94
20
3878 G25
88
86
5 10 15 25
84
82
80
EFFICIENCY (%)
1.6%
LTC3878
LTC1778
Q
T
= RJK0305DPB
Q
B
= RJK0330DPB
L = PULSE PA0513.441NLT
f
SW
= 300kHz
V
IN
= 12V
V
OUT
= 1.2V
TEMPERATURE (°C)
–50
RUN/SS PIN CURRENT (µA)
1.2
1.4
3878 G26
1.0
0.8
0
50
100
1.6
V
IN
= 15V
V
OUT
= 1.2V
FCB = INTV
CC