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| LTC3556 Datasheet, PDF (9/36 Pages) Linear Technology – High Effi ciency USB Power Manager with Dual Buck and Buck-Boost DC/DCs | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3556
PGOODALL, CHRG Pin Current
vs Voltage (Pull-Down State)
100 VBUS = 5V
BAT = 3.8V
80
3.3V LDO Step Response
(5mA to 15mA)
ILDO3V3
5mA/DIV
Battery Drain Current
vs Temperature
50
BAT = 3.8V
VBUS = 0V
ALL REGULATORS OFF
40
60
0mA
VLDO3V3
40
20mV/DIV
AC COUPLED
20
BAT = 3.8V
20μs/DIV
3556 G20
0
0
1
2
3
4
5
PGOODALL, CHRG PIN VOLTAGE (V)
3556 G19
Switching Regulators 1, 2 Pulse
Skip Mode Quiescent Currents
325
1.95
VIN1,2 = 3.8V
300
1.90
VOUT1,2 = 2.5V
(CONSTANT FREQUENCY)
275
1.85
250
1.80
225
200
â40
1.75
VOUT1,2 = 1.25V
(PULSE SKIPPING)
1.70
â15
10
35
60
85
TEMPERATURE (°C)
3556 G22
Switching Regulators 1, 2
Pulse Skip Mode Efï¬ciency
100
90
VOUT1,2 = 2.5V
80
70
VOUT1,2 = 1.2V
60
VOUT1,2 = 1.8V
50
40
30
20
10
0
VIN1,2 = 3.8V
1
10
100
1000
LOAD CURRENT (mA)
3556 G23
30
20
10
0
â40 â15 10
35
60
85
TEMPERATURE (°C)
3556 G21
Switching Regulators 1, 2
Burst Mode Efï¬ciency
100
VOUT1,2 = 2.5V
90
80
VOUT1,2 = 1.2V
70
VOUT1,2 = 1.8V
60
50
40
30
20
10
0
0.1
VIN1,2 = 3.8V
1
10
100
LOAD CURRENT (mA)
1000
3556 G24
Switching Regulators 1, 2
Forced Burst Mode Efï¬ciency
100
VOUT1,2 = 2.5V
90
80
VOUT1,2 = 1.2V
70
VOUT1,2 = 1.8V
60
50
40
30
20
10
0
0.1
VIN1,2 = 3.8V
1
10
100
LOAD CURRENT (mA)
1000
3556 G25
Switching Regulators 1, 2 Load
Regulation at VOUT1,2 = 1.2V
1.230
VBUS = 3.8V
1.215
Burst Mode
OPERATION
1.200
PULSE SKIP
MODE
1.185
1.170
0.1
FORCED
Burst Mode
OPERATION
1
10
100
LOAD CURRENT (mA)
1000
3556 G26
Switching Regulators 1, 2 Load
Regulation at VOUT1,2 = 1.8V
1.845
VBUS = 3.8V
Burst Mode OPERATION
1.823
PULSE SKIP MODE
1.800
FORCED
Burst Mode
OPERATION
1.778
1.755
0.1
1
10
100
LOAD CURRENT (mA)
1000
3556 G27
3556f
9
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