Datasheet
LTC3544B
4
3544bfb
Typical perForMance characTerisTics
V
REF
vs Temperature at 2.25V,
3.6V, 5.5V
Switching Frequency vs Supply
Voltage and Temperature
Efficiency vs Load Current 300mA
Channel. All Other Channels at
50% Peak Current
Efficiency vs Load Current 300mA
Channel. All Other Channels Off
Efficiency vs Load Current 200mA
Channel A. All Other Channels Off
Efficiency vs Load Current 200mA
Channel B. All Other Channels Off
Load Regulation, All Channels
Efficiency vs Load Current 100mA
Channel. All Other Channels Off
Efficiency vs Supply Voltage, All
Channels 50% Loaded
TEMPERATURE (°C)
–50
0.785
V
REF
(V)
0.790
0.795
0.800
0805
0.810
0.815
0 50 100
3544B G01
V
IN
= 2.25V
V
IN
= 3.6V
V
IN
= 5.5V
CHANNEL 200A
I
LOAD
= 100mA
ALL CHANNELS OPERATING
SUPPLY VOLTAGE (V)
2
1.5
SWITCHING FREQUENCY (MHz)
2.0
2.5
3.0
3 4
3544B G02
5 6
f
OSC
–40°C
f
OSC
0°C
f
OSC
25°C
f
OSC
80°C
I
LOAD
CHANNEL 100 = 50mA
ALL CHANNELS OPERATING
LOAD CURRENT 300mA CHANNEL (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
3544B G03
0
0.001
V
IN
= 3.6V
V
OUT
= 1.8V
T
A
= 25°C
ALL OTHER CHANNELS LOADED 50%
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
3544B G04
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
= 5.5V
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
3544B G05
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
= 5.5V
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
3544B G06
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
= 5.5V
LOAD CURRENT (A)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
3544B G07
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
= 5.5V
LOAD (mA)
0
0.6
0.8
1.2
300
3544B G09
0.4
0.2
100 200 400
0
–0.2
1.0
V
OUT
ERROR (%)
100mA
200mA (A)
200mA (B)
300mA
V
IN
= 3.6V
T
A
= 25°C
CHANNELS NOT UNDER
TEST HELD AT CONSTANT
50% MAXIMUM LOAD
SUPPLY VOLTAGE (V)
2
EFFICIENCY (%)
70
80
3544B G08
60
50
3
4
5
100
90
V
OUT100
= 1.2V
V
OUT200A
= 0.8V
V
OUT200B
= 1.5V
V
OUT300
= 1.8V
T
A
= 25°C