LTC3125 Linear Technology, LTC3125 Datasheet - Page 4

• Manufacturer Part Number: LTC3125
• Description: 1.2A Synchronous Step-Up DC/DC Converter
• Manufacturer: Linear Technology

www.DataSheet4U.com
LTC3125
TYPICAL PERFORMANCE CHARACTERISTICS
4
–0.50
–1.00
–1.50
1.50
1.00
0.50
100
90
80
70
60
40
30
20
10
50
50
40
30
20
10
0.001
0
0
–50
1.8
Effi ciency vs Load Current,
V
Average Input Current Limit vs
Temperature
Burst Mode Threshold Current
vs V
NORMALIZED TO 25°C
OUT
V
C
L = 2.2μH
OUT
OUT
IN
–25
= 5V
= 3.3V
= 1500μF
2.0
TEMPERATURE (°C)
0.01
LOAD CURRENT (A)
0
2.2
V
IN
25
(V)
2.4
0.1
50
V
V
2.6
IN
IN
75
= 4V
= 3.3V
3125 G06
3125 G03
3125 G09
100
2.8
1
0.001
1
0.1
0.01
1.25
1.00
0.75
0.50
0.25
50
45
40
35
30
25
20
0
1.8
10 20 30 40 50
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
Average Input Current vs R
Burst Mode Threshold Current
vs V
0
V
C
L = 2.2μH
1.5
OUT
OUT
No-Load Input Current vs V
IN
= 2.5V
= 1500μF
V
OUT
1.9
2
= 2.5V
V
OUT
R
V
OUT
PROG
V
= 4V
2.5
IN
2.0
60
= 3.8V
(V)
V
V
(kΩ)
IN
OUT
70 80 90 100
(V)
= 3.3V
3
2.1
PROG
(T
3.5
IN
3125 G10
3125 G07
A
= 25°C unless otherwise noted)
3125 G04
110
2.2
4
2.25
2.20
2.55
2.50
2.45
2.40
2.35
2.30
2.15
2.10
2.05
2.00
–0.5
–1.0
–2.0
–1.5
–1
–2
–3
–4
–5
–6
–7
–8
2.0
1.5
1.0
0.5
2
1
0
0
2.0
1.5
1.5
Peak Current Limit vs V
Oscillator Frequency vs V
Average Input Current Limit vs V
NORMALIZED TO V
V
R
NORMALIZED TO 25°C
OUT
PROG
2
2.5
2.0
= 3.8V
= 0Ω
2.5
3.0
2.5
3
V
V
OUT
OUT
V
IN
3.5
3.5
IN
3.0
(V)
= 3.3V
(V)
(V)
4
4.0
3.5
IN
4.5
OUT
4.5
4.0
5
3125 G11
3125 G08
3125 G05
3125f
IN
5.0
5.5
4.5