Datasheet

LTC3646/LTC3646-1
6
36461fa
For more information www.linear.com/LTC3646
Typical perForMance characTerisTics
Output Voltage vs Time,
Burst Mode Operation
Start-Up from Shutdown,
Burst Mode Operation
Start-Up from Shutdown,
Forced Continuous Mode
Load Step, Burst Mode Operation
Load Step,
Forced Continuous Operation
I
Q
Shutdown vs Supply and
Temperature
T
A
= 25°C, SVIN/PVIN = 12V, f
O
= 1MHz unless otherwise noted.
Bottom Switch Current Limit
vs Temperature
No Load Quiescent Current vs
Temperature, Burst Mode Operation
Load Regulation
TEMPERATURE (°C)
–40
NO LOAD QUIESCENT CURRENT (µA)
140
180
140120100
36461 G10
100
0–20
200
120
160
20 40 60 80
TEMPERATURE (°C)
–40
BOTTOM SWITCH CURRENT LIMIT (A)
1.2
1.4
140120100
36461 G11
1.0
0–20
1.5
1.1
1.3
20 40 60 80
LOAD CURRENT (A)
0
∆V
OUT
/V
OUT
(%)
0.8 1
36461 G12
–0.4
0.2 0.4 0.6
1.6
0
0.4
0.8
1.2
V
OUT
= 5V
FORCED CONTINUOUS
Burst Mode OPERATION
V
IN
= 12V
V
OUT
= 5V
I
LOAD
= 20mA
2µs/DIV
36461 G13
V
OUT
20mV/DIV
AC-COUPLED
I
L
250mA/DIV
SW
10V/DIV
I
LOAD
= 25mA
100µs/DIV
36461 G14
V
OUT
5V/DIV
I
L
250mA/DIV
RUN
5V/DIV
I
LOAD
= 25mA
100µs/DIV
36461 G15
V
OUT
5V/DIV
I
L
250mA/DIV
RUN
5V/DIV
V
OUT
= 1.2V
50mA to 1A STEP
f
O
= 2.25MHz
R
COMP
= 200kΩ
C
COMP
= 33pF
C
F
= 10pF
C
OUT
= 15µF
40µs/DIV
36461 G16
V
OUT
AC-COUPLED
100mV/DIV
I
L
1A/DIV
I
LOAD
1A/DIV
V
OUT
= 1.2V
50mA to 1A STEP
f
O
= 2.25MHz
R
COMP
= 200kΩ
C
COMP
= 33pF
C
F
= 10pF
C
OUT
= 15µF
10µs/DIV
36461 G17
V
OUT
AC-COUPLED
100mV/DIV
I
L
1A/DIV
I
LOAD
1A/DIV
TEMPERATURE (°C)
–40
SHUTDOWN CURRENT (µA)
80 120 140100
36461 G18
0
–20 200 40 60
60
10
20
30
40
50
V
IN
= 40V
V
IN
= 12V