Datasheet

LTC3122
4
3122fa
For more information www.linear.com/LTC3122
Typical perForMance characTerisTics
PWM Mode Operation Load Transient Response Inrush Current Control
Feedback vs Temperature
R
DS(ON)
vs Temperature,
Both NMOS and PMOS
Oscillator Frequency
vs Temperature
Efficiency vs Load Current,
V
OUT
= 5V
Efficiency vs Load Current,
V
OUT
= 7.5V
Efficiency vs Load Current,
V
OUT
= 12V
Configured as front page application unless otherwise specified.
1µs/DIV
3122 G04
V
OUT
20mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
1A/DIV
I
LOAD
= 200mA
500µs/DIV
3122 G05
V
OUT
500mV/DIV
AC-COUPLED
OUTPUT
CURRENT
500mA/DIV
80mA 80mA
800mA
2ms/DIV
3122 G06
V
OUT
5V/DIV
SD
5V/DIV
INPUT
CURRENT
1A/DIV
TEMPERATURE (°C)
–50
CHANGE IN R
DS(ON)
FROM 25°C (%)
80
60
40
20
0
–20
–40
70 110–10
3122 G08
30 150
TEMPERATURE (°C)
–60
CHANGE IN FREQUENCY FROM 25°C (%)
1.0
0.5
–0.5
–1.0
0
–1.5
–2.0
90–10
3122 G09
40 140
TEMPERATURE (°C)
–60
CHANGE IN V
FB
FROM 25°C (%)
0.2
0.1
–0.2
–0.1
0
–0.3
–0.4
–0.5
–0.6
40 90–10
3122 G07
140
LOAD CURRENT (mA)
0.01
EFFICIENCY (%)
100
90
70
50
40
80
60
30
20
10
0
100.1
3122 G01
100001 100 1000
BURST
PWM
V
IN
= 4.2V
V
IN
= 3.3V
V
IN
= 0.6V
LOAD CURRENT (mA)
0.01
EFFICIENCY (%)
100
90
70
50
40
80
60
30
20
10
0
100.1
3122 G03
10001 100
PWM
V
IN
= 5.4V
V
IN
= 4.2V
V
IN
= 2.6V
BURST
LOAD CURRENT (mA)
0.01
EFFICIENCY (%)
100
90
70
50
40
80
60
30
20
10
0
100.1
3122 G02
100001 100 1000
PWM
V
IN
= 5.4V
V
IN
= 3.8V
V
IN
= 2.3V
BURST