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| LTC3545-1_15 Datasheet, PDF (5/20 Pages) Linear Technology – Triple 800mA Synchronous Step-Down Regulator–2.25MHz | |||
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LTC3545/LTC3545-1
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Temperature,
Pulse Skipping
450
400
350
300
250
200 VFB3 = 0.625V
ILOAD = 0mA
CHANNEL 3 ONLY
150
â50
0
50
VIN = 5.5V
VIN = 4.5V
VIN = 3.5V
VIN = 2.5V
100
150
TEMPERATURE (°C)
3545 G07
Channel 1 Load Step Response
Efï¬ciency vs Load Current,
Burst Mode Operation
100
90
80
70
60
50
40
VIN = 2.7V
VIN = 3.6V
30
VIN = 4.2V
20
TA = 25°C
VOUT = 1.8V
10 CHANNEL 3, OTHER CHANNELS OFF
fOSC = 2.25MHz
0
0.1
1
10
100
LOAD CURRENT (mA)
1000
3545 G08
Channel 2 Load Step Response
Efï¬ciency vs Load Current,
Pulse Skipping Operation
100
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
TA = 25°C
VOUT = 1.8V
CHANNEL 3, OTHER CHANNELS OFF
fOSC = 2.25MHz
1
10
100
LOAD CURRENT (mA)
1000
3545 G09
Channel 3 Load Step Response
VOUT1
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
TA = 25°C
10μs/DIV
VIN = 3.6V
VOUT = 1.2V
LOAD STEP 0mA TO 600mA
Burst Mode OPERATION
VOUT2
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
3545 G10
TA = 25°C
10μs/DIV
VIN = 3.6V
VOUT = 1.5V
LOAD STEP 0mA TO 600mA
Burst Mode OPERATION
VOUT3
100mV/DIV
IL
500mA/DIV
ILOAD
500mA/DIV
3545 G11
TA = 25°C
10μs/DIV
VIN = 3.6V
VOUT = 1.8V
LOAD STEP 0mA TO 600mA
Burst Mode OPERATION
3545 G12
35451fb
5
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