ltc1778-1 Linear Technology Corporation, ltc1778-1 Datasheet - Page 6

• Manufacturer Part Number: ltc1778-1
• Description: Wide Operating Range, No Rsense Step-down Controller
• Manufacturer: Linear Technology Corporation

LTC1778/LTC1778-1
TYPICAL PERFOR A CE CHARACTERISTICS
6
1.6
2.0
1.8
1.4
1.2
1.0
10
6
0
8
4
2
–50 –25
–50 –25
Error Amplifier g
EXTV
vs Temperature
CC
Switch Resistance
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
25
25
4.5
3.5
3.0
5.0
4.0
m
–50
50
50
RUN/SS Latchoff Thresholds
vs Temperature
vs Temperature
–25
75
75
W
100
100
LATCHOFF THRESHOLD
0
TEMPERATURE (°C)
1778 G13
1778 G14
LATCHOFF ENABLE
U
25
125
125
50
1200
1000
800
600
400
200
0
–0.25
–1.50
75
–0.50
–0.75
–1.00
–1.25
0
Input and Shutdown Currents
vs Input Voltage
0
–50
100
5
FCB Pin Current vs Temperature
1778 G17
–25
125
10
INPUT VOLTAGE (V)
EXTV
EXTV
0
TEMPERATURE (°C)
15
CC
CC
SHUTDOWN
25
OPEN
= 5V
20
50
25
75
30
2.5
4.0
3.5
3.0
2.0
1778 G24
–50
100
Undervoltage Lockout Threshold
vs Temperature
35
1778 G15
0
–25
60
50
40
30
20
10
125
0
TEMPERATURE (C)
25
–0.1
–0.4
–0.2
–0.3
–0.5
–2
–1
3
2
1
0
0
–50 –25
0
INTV
RUN/SS Pin Current
vs Temperature
50
CC
75
10
INTV
Load Regulation
PULL-DOWN CURRENT
0
TEMPERATURE (°C)
100
PULL-UP CURRENT
CC
1778 G18
LOAD CURRENT (mA)
20
25
125
50
30
75
40
100
1778 G16
1778 G25
1778fb
125
50