Datasheet

LTC3775
5
3775fa
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency vs Load Current Effi ciency vs Input Voltage Load Regulation
Line Regulation FB Voltage vs Temperature
Load Step in Forced Continuous
Mode
Positive Load Step in Forced
Continuous Mode
Negative Load Step in Forced
Continuous Mode
Load Step in Pulse-Skipping Mode
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.01 1 10 100
3775 G01
0
0.1
V
IN
= 12V
V
OUT
= 1.2V
SW FREQ = 500kHz
FIRST PAGE CIRCUIT
PULSE-SKIPPING
MODE
CONTINUOUS
MODE
INPUT VOLTAGE (V)
4
40
EFFICIENCY (%)
50
60
70
80
100
8
12 16 20
3775 G02
24 28
90
15A LOAD
1A LOAD
V
OUT
= 1.2V
CONTINUOUS MODE
SW FREQ = 500kHz
FIRST PAGE CIRCUIT
LOAD CURRENT (A)
0
1.194
V
OUT
(V)
1.196
1.198
1.200
1.202
48
12
16
3775 G03
1.204
1.206
26
10
14
V
IN
= 12V
SW FREQ = 500kHz
FIRST PAGE CIRCUIT
INPUT VOLTAGE (V)
4
1.194
V
OUT
(V)
1.196
1.198
1.200
1.202
1.206
8
12 16 20
3775 G02
24 28
1.204
V
OUT
= 1.2V
LOAD = 1A
FIRST PAGE CIRCUIT
TEMPERATURE (°C)
–50
FB VOLTAGE (mV)
601
602
603
25 75
3775 G05
600
599
–25 0
50 100 125
598
597
V
OUT(AC)
100mV/DIV
I
L
10A/DIV
I
LOAD
10A/DIV
50µs/DIV
3775 G06
V
IN
= 12V
V
OUT
= 1.2V
LOAD STEP = 0A TO 10A TO 0A
MODE/SYNC = 0V
SW FREQ = 500kHz
FIRST PAGE CIRCUIT
V
OUT(AC)
100mV/DIV
V
SW
20V/DIV
I
L
10A/DIV
I
LOAD
10A/DIV
5µs/DIV
3775 G07
V
IN
= 12V
V
OUT
= 1.2V
LOAD STEP = 0A TO 10A
MODE/SYNC = 0V
SW FREQ = 500kHz
FIRST PAGE CIRCUIT
V
OUT(AC)
100mV/DIV
V
SW
20V/DIV
I
L
10A/DIV
I
LOAD
10A/DIV
5µs/DIV
3775 G08
V
IN
= 12V
V
OUT
= 1.2V
LOAD STEP = 10A TO 0A
MODE/SYNC = 0V
SW FREQ = 500kHz
FIRST PAGE CIRCUIT
V
OUT(AC)
100mV/DIV
I
L
10A/DIV
I
LOAD
10A/DIV
50µs/DIV
3775 G09
V
IN
= 12V
V
OUT
= 1.2V
LOAD STEP = 1A TO 11A TO 1A
MODE/SYNC = INTV
CC
SW FREQ = 500kHz
FIRST PAGE CIRCUIT