lt1776 Linear Technology Corporation, lt1776 Datasheet - Page 4

• Manufacturer Part Number: lt1776
• Description: Wide Input Range, High Efficiency, Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

LT1776
TYPICAL PERFORMANCE CHARACTERISTICS
4
900
800
700
600
500
400
300
200
215
210
205
200
195
190
185
7.4
7.2
7.0
6.8
6.6
6.4
6.2
6.0
–50
–50
–50
SHDN Pin Shutdown Threshold
vs Temperature
Switching Frequency
vs Temperature
Minimum Input Voltage vs
Temperature
–25
–25
–25
0
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
25
25
25
50
50
50
75
75
75
W
100
100
100
LT1776 G04
1776 G01
1776 G07
U
125
125
125
1.50
1.25
1.00
0.75
0.50
0.25
2.25
2.00
1.75
1.50
1.25
1.00
0.75
–10
–15
–20
–5
0
5
0
–50
0
0
Switch-On Voltage vs
Switch Current
SHDN Pin Input Current
vs Voltage
Minimum Synchronization Voltage
vs Temperature
100
–25
1
SWITCH CURRENT (mA)
200
SHDN PIN VOLTAGE (V)
0
TEMPERATURE ( C)
– 55 C
125 C
300
2
25
400
50
25 C
3
500
75
4
600
25 C
–55 C
125 C
100
1776 G02
1776 G05
1776 G08
700
125
5
1000
1.30
1.28
1.26
1.24
1.22
1.20
600
500
400
300
200
100
800
600
400
200
0
0
–50
–50
Switch Current Limit vs
Duty Cycle
0
SHDN Pin Lockout Thresholds
vs Temperature
Switch Minimum On-Time
vs Temperature
T
V
R
FB =
A
10
IN
L
–25
–25
= 25 C
= 39
= 40V
20
0
LOWER THRESHOLD
0
UPPER THRESHOLD
30
TEMPERATURE ( C)
TEMPERATURE ( C)
DUTY CYCLE (%)
40
25
25
50
50
50
60
75
70
75
80
100
100
LT1776 G06
90
1776 G09
1776 G03
125
125
100