LTC3878 Linear Technology Corporation, LTC3878 Datasheet - Page 6

• Manufacturer Part Number: LTC3878
• Description: Wide Operating Range No RSENSE Step-Down Controller
• Manufacturer: Linear Technology Corporation

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