LT1777 Linear Technology, LT1777 Datasheet - Page 4

• Manufacturer Part Number: LT1777
• Description: Low Noise Step-Down Switching Regulator
• Manufacturer: Linear Technology

LT1777
TYPICAL PERFOR A CE CHARACTERISTICS
4
1000
–10
–15
–20
800
600
400
200
7.4
7.2
7.0
6.8
6.6
6.4
6.2
6.0
–5
0
5
0
–50
0
0
Minimum Input Voltage
vs Temperature
Switch Current Limit
vs Duty Cycle
SHDN Pin Current vs Voltage
T
A
10
–25
= 25 C
20
1
SHDN PIN VOLTAGE (V)
0
30
TEMPERATURE ( C)
DUTY CYCLE (%)
40
2
25
50
W
50
60
3
U
75
70
80
4
100
25 C
125 C
–55 C
1777 G01
90
1777 G03
1777 G05
125
100
5
1.30
1.28
1.26
1.24
1.22
1.20
1.50
1.25
1.00
0.75
0.50
0.25
900
800
700
600
500
400
300
200
0
–50
–50
0
Switch On Voltage
vs Switch Current
SHDN Pin Shutdown Threshold
vs Temperature
SHDN Pin Lockout Thresholds
vs Temperature
–25
–25
100
200
SWITCH CURRENT (mA)
0
LOWER THRESHOLD
0
UPPER THRESHOLD
TEMPERATURE ( C)
TEMPERATURE ( C)
– 55 C
125 C
300
25
25
400
50
50
25 C
500
75
75
100
100
600
1777 G04
1777 G02
1777 G06
125
125
700