LT1676 Linear Technology, LT1676 Datasheet - Page 4

• Manufacturer Part Number: LT1676
• Description: Wide Input Range/ High Efficiency/ Step-Down Switching Regulator
• Manufacturer: Linear Technology

LT1676
4
TYPICAL PERFORMANCE CHARACTERISTICS
900
800
700
600
500
400
300
200
106
104
102
100
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
98
96
94
–50
–50
–50
SHDN Pin Shutdown Threshold
vs Temperature
Switching Frequency
vs Temperature
V
Boost Threshold, Clamp Voltage
vs Temperature
C
Pin Switching Threshold,
–25
–25
–25
0
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
25
25
25
50
50
50
THRESHOLD
THRESHOLD
SWITCHING
VOLTAGE
CLAMP
BOOST
75
75
75
W
100
100
100
LT1676 G10
LT1676 G04
1676 G07
U
125
125
125
–100
–150
2.25
2.00
1.75
1.50
1.25
1.00
0.75
–10
–15
–20
–50
100
–5
50
5
0
0
–50
1.0
0
SHDN Pin Input Current
vs Voltage
Minimum Synchronization Voltage
vs Temperature
Feedback Amplifier Output
Current vs FB Pin Voltage
–25
1.1
1
SHDN PIN VOLTAGE (V)
0
TEMPERATURE ( C)
FB PIN VOLTAGE (V)
1.2
2
25
50
1.3
3
75
1.4
4
25 C
–55 C
125 C
100
25 C
–55 C
125 C
1676 G05
1676 G08
1676 G11
125
1.5
5
1.30
1.28
1.26
1.24
1.22
1.20
750
700
650
600
550
500
450
400
600
500
400
300
200
100
0
–50
–50
–50
SHDN Pin Lockout Thresholds
vs Temperature
Switch Minimum On-Time
vs Temperature
Error Amplifier Transconductance
vs Temperature
V
R
FB =
IN
L
–25
–25
–25
= 50
= 48V
0
0
LOWER THRESHOLD
0
UPPER THRESHOLD
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
25
25
25
50
50
50
75
75
75
100
100
100
LT1676 G12
LT1676 G06
1676 G09
125
125
125