Datasheet

LTC3773
6
3773fb
SWITCHING FREQUENCY (kHz)
150
I
VDR
(mA)
I
VCC
(mA)
80
100
120
650 750550
3773 G07
40
60
20
0
2.4
2.5
2.6
2.2
2.3
2.1
2.0
250
350
450
V
IN
= 10V, V
CC
= V
DR
= 5V,
FORCED CONTINUOUS MODE
V
OUT1
= 2.5V WITH 5A LOAD
V
OUT2
= 1.8V WITH 5A LOAD
V
OUT3
= 1.2V WITH 5A LOAD
I
VDR
I
VCC
3773 G09
1.8V V
OUT
50mV/DIV
AC COUPLED
I
LOAD
10A/DIV
I
L
5A/DIV
50μs/DIV
V
IN
= 12V, f
SW
= 220kHz
3773 G11
1.8V V
OUT
50mV/DIV
AC COUPLED
I
LOAD
5A/DIV
50μs/DIV
I
L
5A/DIV
V
SW
10V/DIV
V
IN
= 12V, f
SW
= 220kHz
TYPICAL PERFORMANCE CHARACTERISTICS
I
VDR
and I
VCC
vs Switching Frequency
Forced Continuous Mode
0A to 10A Load Step
Discontinuous Mode 0A to 5A
Load Step at 5kHz Interval
I
VCC
and I
VDR
vs Load Current
Burst Mode Operation 0A to 5A
Load Step at 5kHz Interval
CHANNEL 1 LOAD CURRENT (A)
0.001
1
I
VCC
+ I
VDR
(mA)
100
0.01 0.1 1 10 100
3773 G08
10
FORCED CONTINUOUS
V
IN
= 12V, V
CC
= V
DR
= 5V, V
OUT1
= 2.5V
V
OUT2
= 1.8V (NO LOAD), V
OUT3
= 1.2V (NO LOAD)
DISCONTINUOUS
MODE
Burst Mode
OPERATION
PLLFLTR = 0V
PLLFLTR = 5V
PLLFLTR = FLOATS
3773 G10
1.8V V
OUT
50mV/DIV
AC COUPLED
I
LOAD
5A/DIV
50μs/DIV
I
L
5A/DIV
V
SW
10V/DIV
V
IN
= 12V, f
SW
= 220kHz