LTC3456 Datasheet, PDF (5/28 Pages) Linear Technology – 2-Cell, Multi-Output DC/DC Converter with USB Power Manager

LTC3456
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C unless otherwise specified.
Core Converter Efficiency
(Battery Powered)
100
90
80
70
60
50
40
30
20
10 ^VBATT ^{= 2.4V}
V_CORE = 1.8V
0
1
10
PWM MODE
Burst Mode
OPERATION
100
1000
LOAD CURRENT (mA)
3456 G01
Oscillator Frequency
vs Battery Voltage
1200
1150
1100
1050
1000
950
900
850
800
1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2
V_BATT (V)
3456 G04
No Load Battery Supply Current
vs Battery Voltage
7
FB1 = 1V
6
(CORE CONVERTER
NOT SWITCHING)
5
4
PWM MODE
3
2
1
0
1.6 1.8
Burst Mode OPERATION
2 2.2 2.4 2.6 2.8 3 3.2
V_BATT (V)
3456 G07
Main Converter Efficiency
(Battery Powered)
100
90
80
70
60
50
40
30
20
10 ^VBATT ^{= 2.4V}
V_MAIN = 3.3V
0
1
10
PWM MODE
Burst Mode
OPERATION
100
1000
LOAD CURRENT (mA)
3456 G02
Oscillator Frequency
vs V_EXT Voltage
1200
1150
1100
1050
1000
950
900
850
800
4
4.25 4.5 4.75 5
V_EXT (V)
5.25 5.5
3456 G05
No Load Battery Supply Currrent
vs Temperature
4.0
3.5
PWM MODE
3.0
2.5
FB1 = 1V
2.0
(CORE CONVERTER
NOT SWITCHING)
1.5
1.0
Burst Mode OPERATION
0.5
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G08
Efficiency (USB Powered)
100
V_USB = 5V
90 V_USBHP = 2V
80
70
60
50
40
30
20
10
1.8V OUTPUT
3.3V OUTPUT
0
1
10
100
1000
LOAD CURRENT (mA)
3456 G02
Oscillator Frequency
vs Temperature
1200
V_BATT = 2.4V
1150
1100
1050
1000
950
900
850
800
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G06
Shutdown Current vs Temperature
5
V_BATT = 2.4V
4
3
2
1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G09
3456fa
5