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| LTC3562 Datasheet, PDF (5/20 Pages) Linear Technology – I2C Quad Synchronous Step-Down DC/DC Regulator 2 × 600mA, 2 × 400mA | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3562
Efï¬ciency vs Load Current
100
FORCED
90
Burst Mode OPERATION
80 Burst Mode
70 OPERATION
60
600mA
BUCKS
50
40
PULSE SKIP
30
20
10
0
0.01 0.1
1
10
IOUT (mA)
VIN = 3.8V
VOUT = 1.2V
100 1000
3562 G01
Efï¬ciency vs Load Current
100
FORCED
90 Burst Mode OPERATION
80
70
600mA
BUCKS
60
50
PULSE SKIP
40
Burst Mode
OPERATION
30
20
10
0
0.01 0.1
1
10
IOUT (mA)
VIN = 3.8V
VOUT = 1.8V
100 1000
3562 G02
Efï¬ciency vs Load Current
100
FORCED
90 Burst Mode
80 OPERATION
70
600mA
BUCKS
60
50
PULSE SKIP
Burst Mode
40
OPERATION
30
20
10
0
0.01 0.1
1
10
IOUT (mA)
VIN = 3.8V
VOUT = 2.5V
100 1000
3562 G03
Efï¬ciency vs Load Current
100
FORCED Burst Mode
90 OPERATION
80
600mA
70
BUCKS
60
PULSE SKIP
50
Burst Mode
OPERATION
40
30
20
10
0
0.01 0.1
1
10
IOUT (mA)
VIN = 3.8V
VOUT = 3.3V
100 1000
3562 G04
Output Transient
Burst Mode Operation
Efï¬ciency vs Input Voltage
Burst Mode Operation
100
VOUT = 1.2V
90
80
70
60
50
40
30
IOUT = 0.1mA
20
IOUT = 1mA
IOUT = 10mA
10
IOUT = 100mA
IOUT = 400mA
0
2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
3562 G05
Output Transient
Pulse Skip Mode
Efï¬ciency vs Input Voltage
Burst Mode Operation
100 VOUT = 1.8V
90
80
70
60
50
40
30
IOUT = 0.1mA
20
IOUT = 1mA
IOUT = 10mA
10
IOUT = 100mA
IOUT = 400mA
0
2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
3562 G06
Start-Up Transient
Pulse Skip Mode
VOUT400B
50mV/DIV
AC
COUPLED
VOUT400A
50mV/DIV
AC
COUPLED
300mA
5mA
IOUT400B
50μs/DIV
VOUT400B = 1.2V
VOUT400A = 1.2V
IOUT400A = 20mA
3562 G07
VOUT400B
50mV/DIV
AC
COUPLED
VOUT600B
50mV/DIV
AC
COUPLED
300mA
5mA
IOUT400B
50μs/DIV
VOUT400B = 1.8V
VOUT600B = 1.2V
IOUT600B = 15mA
VOUT600A
500mV/DIV
INDUCTOR
CURRENT
IL = 100mA/
DIV
RUN600A OFF
2V/DIV ON
3562 G08
VOUT600A = 1.2V
RLOAD = 6Ω
50μs/DIV
3562 G09
3562fa
5
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