Datasheet

LTC3545/LTC3545-1
4
35451fb
Burst Mode Operation Effi ciency vs Supply Voltage
Supply Current vs Temperature
Burst Mode Operation
TYPICAL PERFORMANCE CHARACTERISTICS
V
REF
vs Temperature at 2.25V,
3.6V, 5.5V
Switching Frequency vs Supply
Voltage and Temperature Load Regulation, All Channels
TEMPERATURE (°C)
–50
0.585
V
REF
(V)
0.590
0.595
0.600
0.605
0.610
0.615
0 50 150100
3545 G01
2.25V
3.6V
5.5V
SUPPLY VOLTAGE (V)
2
1.5
SWITCHING FREQUENCY (MHz)
2.0
2.5
3.0
34
3545 G02
56
f
OSC
= –40°C
f
OSC
= 0°C
f
OSC
= 25°C
f
OSC
= 80°C
LOAD CURRENT (mA)
0
0.6
0.8
1.2
600
3545 G03
0.4
0.2
200 400 800
0
–0.4
–0.2
1.0
V
OUT
ERROR (%)
CHANNEL 1
CHANNEL 2
CHANNEL 3
T
A
= 25°C
V
IN
= 3.6V
UNTESTED CHANNELS OFF
PULSE SKIP MODE
1µs/DIV
SW
2V/DIV
I
L
100mA/DIV
V
OUT
20mV/DIV
3545 G04
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 50mA
f
OSC
= 2.25MHz
SUPPLY VOLTAGE (V)
2
EFFICIENCY (%)
90
95
6
3545 G05
85
80
3
4
5
100
V
OUT
= 2V
T
A
= 25°C
CHANNEL 3, ALL OTHERS OFF
f
OSC
= 2.25MHz
I
LOAD
= 250mA
TEMPERATURE (°C)
0
SUPPLY CURRENT (µA)
20
60
3545 G06
10
30
50
40
V
IN
= 5.5V
V
IN
= 4.5V
V
IN
= 3.5V
V
IN
= 2.5V
V
FB3
= 0.625V
I
LOAD
= 0mA
CHANNEL 3 ONLY
–50 0 50 150100