Datasheet

LTC3544
5
3544fa
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency vs Load Current 300mA
Channel. All Other Channels Off
Effi ciency vs Load Current 200mA
Channel A. All Other Channels Off
Effi ciency vs Load Current 200mA
Channel B. All Other Channels Off
LOAD CURRENT (A)
30
EFFICIENCY (%)
100
90
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
3544 G08
0
0.001
V
OUT
= 0.8V
T
A
= 25°C
ALL OTHER CHANNELS OFF
V
IN
= 2.25V
V
IN
= 3.6V
V
IN
= 4.2V
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
3544 G09
0
0.001
V
OUT
= 1.5V
T
A
= 25°C
ALL OTHER
CHANNELS OFF
V
IN
= 2.25V
V
IN
= 3.6V
V
IN
= 4.2V
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
3544 G07
0
0.001
V
OUT
= 1.8V
T
A
= 25°C
ALL OTHER
CHANNELS OFF
V
IN
= 2.25V
V
IN
= 3.6V
V
IN
= 4.2V
Load Step Response
300mA Channel
Load Step Response
200mA Channel A
Load Step Response
200mA Channel B
Effi ciency vs Load Current 100mA
Channel. All Other Channels Off
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
3544 G10
0
0.001
V
OUT
= 1.2V
T
A
= 25°C
ALL OTHER
CHANNELS OFF
V
IN
= 2.25V
V
IN
= 3.6V
V
IN
= 4.2V
LOAD (mA)
0
0.6
0.8
1.2
300
3544 G11
0.4
0.2
100 200 400
0
–0.2
1.0
V
OUT
ERROR (%)
V
IN
= 3.6V
T
A
= 25°C
100mA = 1.2V
200mA (A) = 0.8V
200mA (B) = 1.5V
300mA = 1.8V
Burst Mode OPERATION
RIPPLE
V
OUT100
V
OUT200A
V
OUT200B
V
OUT300
RUNx
200μs/DIVV
IN
= 3.6V
T
A
= 25°C
ALL CHANNELS UNLOADED
3544 G12
V
OUT300
100mV/DIV
AC
COUPLED
I
L
250mA/DIV
I
LOAD
250mA/DIV
20μs/DIVV
IN
= 3.6V
V
OUT
= 1.8V
T
A
= 25°C
I
LOAD
= 600μA TO 300mA
3544 G13
V
OUT200A
50mV/DIV
AC
COUPLED
I
L
250mA/DIV
I
LOAD
250mA/DIV
20μs/DIVV
IN
= 3.6V
V
OUT
= 0.8V
T
A
= 25°C
I
LOAD
= 600μA TO 200mA
3544 G14
V
OUT200B
50mV/DIV
AC COUPLED
I
L
250mA/DIV
I
LOAD
250mA/DIV
20μs/DIVV
IN
= 3.6V
V
OUT
= 1.5V
T
A
= 25°C
I
LOAD
= 600μA TO 200mA
3544 G15
Load Regulation
All Channels
Start-Up Curves
All Channels