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LTC3545EUD#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
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
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
LTC3545/LTC3545-1
6
35451fb
TYPICAL PERFORMANCE CHARACTERISTICS
Start-Up From Shutdown
Loaded
PFET R
DS(ON)
vs Supply Voltage PFET R
DS(ON)
vs Temperature
NFET R
DS(ON)
vs Supply Voltage
Start-Up From Shutdown
No Load Load Step Crosstalk
NFET R
DS(ON)
vs Temperature
200µs/DIV
I
SUPPLY
1A/DIV
RUNX
5V/DIV
V
OUT1
V
OUT2
V
OUT3
(ALL 1V/DIV)
3545 G13
T
A
= 25°C
V
IN
= 3.6V
I
LOAD
= 600mA, ALL CHANNELS
200µs/DIV
I
SUPPLY
50mA/DIV
V
OUT1
1V/DIV
V
OUT2
1V/DIV
V
OUT3
1V/DIV
3545 G14
T
A
= 25°C
V
IN
= 3.6V
I
LOAD
= 0, ALL CHANNELS
200µs/DIV
I
LOAD
CH1
50mA/DIV
V
OUT2
2mV/DIV
V
OUT3
2mV/DIV
V
OUT1
100mV/DIV
3545 G15
T
A
= 25°C
V
IN
= 3.6V
500mA LOAD STEP IN CHANNEL1
CHANNELS 2 AND 3 LOADED AT 400mA EACH
SUPPLY VOLTAGE (V)
2
0
R
DS(ON)
()
0.20
0.60
0.50
3
4
3545 G16
0.10
0.40
0.30
5
6
T
A
= 125°C
T
A
= 80°C
T
A
= 25°C
T
A
= 0°C
T
A
= –40°C
TEMPERATURE (°C)
–40
0
R
DS(ON)
()
0.05
0.15
0.20
0.25
0.50
0.35
10
3545 G17
0.10
0.40
0.45
0.30
60 110
V
IN
= 2.5V
V
IN
= 3.5V
V
IN
= 5.5V
SUPPLY VOLTAGE (V)
2
0
R
DS(ON)
()
0.20
0.60
0.50
3
4
3545 G18
0.10
0.40
0.30
5
6
T
A
= 125°C
T
A
= 80°C
T
A
= 25°C
T
A
= 0°C
T
A
= –40°C
TEMPERATURE (°C)
–40
0
R
DS(ON)
()
0.05
0.15
0.20
0.25
0.50
0.35
10
3545 G19
0.10
0.40
0.45
0.30
60 110
V
IN
= 2.5V
V
IN
= 3.5V
V
IN
= 5.5V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC3545EUD#PBF

Mfr. #:
Buy LTC3545EUD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Triple 800mA Synchronous Buck Converter in QFN
Lifecycle:
New from this manufacturer.
Delivery:
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