Datasheet

LTC3122
6
3122fa
For more information www.linear.com/LTC3122
Typical perForMance characTerisTics
Burst Mode Operation
Burst Mode Operation
to PWM Mode
PWM Mode to Burst Mode
Operation
Burst Mode Transient Synchronized Operation Short-Circuit Response
Efficiency vs Frequency CAP Pin Voltage vs V
OUT
V
CC
vs V
IN
OUTPUT CURRENT (mA)
10
EFFICIENCY (%)
100
40
30
20
60
50
70
90
80
10
0
100
3122 G19
1000
f
OSC
= 200kHz
f
OSC
= 1MHz
f
OSC
= 3MHz
V
OUT
(V)
0
V
CAP
, REFERRED TO V
OUT
(V)
0
–3
–4
–5
–2
–1
–6
–7
10642
3122 G20
8 1412
V
IN
(V)
0
V
CC
(V)
4.5
4.0
3.5
3.0
2.5
421
3122 G21
3 65
V
IN
FALLING
V
IN
RISING
1µs/DIV
3122 G26
V
SW
5V/DIV
V
PWM/SYNC
5V/DIV
SYNCHRONIZED TO 1.3MHz
100µs/DIV
3122 G27
V
OUT
5V/DIV
INPUT
CURRENT
2A/DIV
SHORT-CIRCUIT APPLIED
SHORT-CIRCUIT
REMOVED
20µs/DIV
3122 G23
V
OUT
100mV/DIV
AC-COUPLED
V
PWM/SYNC
2V/DIV
OUTPUT CURRENT = 70mA
20µs/DIV
3122 G24
V
OUT
100mV/DIV
AC-COUPLED
V
PWM/SYNC
2V/DIV
OUTPUT CURRENT = 70mA
5µs/DIV
3122 G22
V
OUT
100mV/DIV
AC-COUPLED
V
SW
10V/DIV
INDUCTOR
CURRENT
0.5A/DIV
OUTPUT CURRENT = 50mA
200µs/DIV
3122 G25
V
OUT
200mV/DIV
AC-COUPLED
OUTPUT
CURRENT
100mA/DIV
10mA 10mA
100mA