Datasheet

LTC3545/LTC3545-1
5
35451fb
TYPICAL PERFORMANCE CHARACTERISTICS
Channel 1 Load Step Response Channel 2 Load Step Response Channel 3 Load Step Response
Supply Current vs Temperature,
Pulse Skipping
Effi ciency vs Load Current,
Burst Mode Operation
Effi ciency vs Load Current,
Pulse Skipping Operation
TEMPERATURE (°C)
150
SUPPLY CURRENT (µA)
200
250
300
350
450
3545 G07
400
V
FB3
= 0.625V
I
LOAD
= 0mA
CHANNEL 3 ONLY
V
IN
= 5.5V
V
IN
= 4.5V
V
IN
= 3.5V
V
IN
= 2.5V
–50 0 50 150100
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3545 G08
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
T
A
= 25°C
V
OUT
= 1.8V
CHANNEL 3, OTHER CHANNELS OFF
f
OSC
= 2.25MHz
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3545 G09
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
T
A
= 25°C
V
OUT
= 1.8V
CHANNEL 3, OTHER CHANNELS OFF
f
OSC
= 2.25MHz
10µs/DIV
I
LOAD
500mA/DIV
I
L
500mA/DIV
V
OUT1
100mV/DIV
3545 G10
T
A
= 25°C
V
IN
= 3.6V
V
OUT
= 1.2V
LOAD STEP 0mA TO 600mA
Burst Mode OPERATION
10µs/DIV
I
LOAD
500mA/DIV
I
L
500mA/DIV
V
OUT2
100mV/DIV
3545 G11
T
A
= 25°C
V
IN
= 3.6V
V
OUT
= 1.5V
LOAD STEP 0mA TO 600mA
Burst Mode OPERATION
10µs/DIV
I
LOAD
500mA/DIV
I
L
500mA/DIV
V
OUT3
100mV/DIV
3545 G12
T
A
= 25°C
V
IN
= 3.6V
V
OUT
= 1.8V
LOAD STEP 0mA TO 600mA
Burst Mode OPERATION