lt3505ems8e-trpbf Linear Technology Corporation, lt3505ems8e-trpbf Datasheet - Page 5

• Manufacturer Part Number: lt3505ems8e-trpbf
• Description: 1.2a, Step-down Switching Regulator In 3mm X 3mm Dfn
• Manufacturer: Linear Technology Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
4.00
3.90
3.80
3.70
3.60
3.50
3.40
3.30
3.20
3.10
3.00
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
5.3
5.1
4.9
4.7
4.3
4.1
3.9
3.7
3.5
5.5
4.5
0
–50
1
0
Undervoltage Lockout
Soft-Start
Typical Minimum Input Voltage,
(V
T
T
TO START
A
A
OUT
TO RUN
= 25°C
0.25
= 25°C
–25
= 3.3V, f
0.50
SHDN PIN VOLTAGE (V)
LOAD CURRENT (mA)
0
TEMPERATURE (°C)
10
0.75
25
SW
1
= 750kHz)
50
1.25
100
75
1.50 1.75
100
3505 G10
1000
125
2
1.60
1.40
1.00
2.40
2.20
2.00
1.80
1.20
0.60
0.80
5.5
5.0
4.5
4.0
3.5
50
45
40
35
30
25
20
15
10
5
0
–50
1
0
Typical Minimum Input Voltage,
(V
Switching Frequency
SHDN Pin Current
T
T
TO START
A
TO RUN
A
OUT
= 25°C
2
= 25°C
–25
= 3.3V, f
4
LOAD CURRENT (mA)
0
TEMPERATURE (°C)
6
10
R
R
8
V
R
25
T
T
SHDN
SW
T
= 30.1k
= 75.0k
= 21k
10
= 2.2MHz)
50
(V)
12 14
100
75
16
100
18
3505 G14
1000
125
20
7.0
6.8
6.6
6.4
6.2
6.0
5.8
5.6
5.4
5.2
5.0
0.3
7.0
6.8
6.6
6.4
6.0
5.6
5.4
5.2
0.6
0.5
0.4
0.1
7.2
6.2
5.8
0.2
0
0
1
1
Frequency Foldback, R
Typical Minimum Input Voltage,
(V
Typical Minimum Input Voltage,
(V
T
TO START
T
TO START
A
A
TO RUN
OUT
TO RUN
OUT
= 25°C
= 25°C
0.1
= 5V, f
= 5V, f
0.2
LOAD CURRENT (mA)
LOAD CURRENT (mA)
10
10
FB VOLTAGE (V)
0.3
SW
SW
0.4
= 750kHz)
= 2.2MHz)
LT3505
0.5
100
100
T
= 75.0k
0.6
T
A
= 25°C
0.7
3505 G15
3505 G12
3505fc
5
1000
1000
0.8