ltc3576 Linear Technology Corporation, ltc3576 Datasheet - Page 11

• Manufacturer Part Number: ltc3576
• Description: Switching Power Manager With Usb On-the-go + Triple Step-down Dc/dcs
• Manufacturer: Linear Technology Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
100
2.8
2.6
3.4
3.2
3.0
90
80
70
60
50
40
30
20
10
0
–40
0
3.3V LDO Output Voltage vs
Load Current, V
Switching Regulator Soft-Start
Waveform
Switching Regulator Low Power
Quiescent Currents vs Temperature
BAT = 3V
BAT = 3.1V
BAT = 3.2V
BAT = 3.3V
BAT = 3.9V, 4.2V
–15
5
Burst Mode OPERATION
LOAD CURRENT (mA)
TEMPERATURE (°C)
PULSE-SKIP MODE
10
10
LDO MODE
50μs/DIV
BUS
BAT = 3.4V
= 0V
35
15
BAT = 3.5V
BAT = 3.6V
60
20
3576 G40
3576 G43
3576 G37
85
25
AC COUPLED
20mV/DIV
5mA/DIV
V
I
LDO3V3
LDO3V3
0mA
100
2.0
1.0
0.5
1.5
90
80
70
60
50
40
30
20
10
0
0
–40
0.1
3.3V LDO Step Response
(5mA to 15mA)
BAT = 3.8V
Switching Regulator Current Limit
vs Temperature
Switching Regulators 1, 2
Pulse-Skip Mode Effi ciency
V
V
IN3
IN1,2,3
= 3.8V
–15
= 3.8V
1
LOAD CURRENT (mA)
TEMPERATURE (°C)
REGULATORS 1, 2
V
REGULATOR 3
OUT1,2
10
V
20μs/DIV
OUT1,2
10
= 2.5V
V
OUT1,2
= 1.8V
35
= 1.2V
100
60
T
A
3576 G41
3576 G44
3576 G38
= 25°C unless otherwise specifi ed.
1000
85
LTC3576/LTC3576-1
100
1.0
0.8
0.4
0.2
0.6
35
30
25
20
15
90
80
70
60
50
40
30
20
10
10
0
5
0
0
–40
2.7
0.1
Battery Drain Current vs
Battery Voltage
R
Power Switches vs Temperature
Switching Regulators 1, 2
Burst Mode Effi ciency
V
I
VOUT
DS(ON)
IN3
NMOS SWITCH
PMOS SWITCH
NMOS SWITCH
PMOS SWITCH
= 3.8V V
V
= 0mA
–15
3.0
BUS
for Switching Regulator
1
BATTERY VOLTAGE (V)
= 0V
LOAD CURRENT (mA)
(SUSPEND MODE)
TEMPERATURE (°C)
V
OUT1,2
OUT1,2
3.3
V
10
BUS
10
= 1.8V
V
= 2.5V
= 5V
REGULATORS 1, 2
OUT1,2
REGULATOR 3
3.6
35
= 1.2V
100
3.9
60
11
3576 G39
3576 G42
3576 G45
3576f
1000
4.2
85