LTC3456_15 Datasheet, PDF (7/28 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.
Maximum V_CORE Load Current
Capability (Output 4% Below
Regulation)
600
L = 10µH
(USB/WALL POWERED)
500
Maximum V_MAIN Load Current
Capability (Output 4% Below
Regulation)
500
L = 10µH
(USB/WALL POWERED)
400
400
300
300
200
200
4
4.25 4.5 4.75 5
V_EXT (V)
5.25 5.5
3456 G19
USB Current Limit
500
450
USBHP = 2V
400
350
300
250
200
150
100
USBHP = 0V
50
V_USB = 5V
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3456 G22
V_EXT Undervoltage Lockout
4.50
4.25
RISING
4.00
FALLING
3.75
3.50
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G25
100
4
4.25 4.5 4.75 5
V_EXT (V)
5.25 5.5
3456 G20
A_IN Pin Reference Voltage
0.820
0.815
0.810
0.805
0.800
V_EXT = 5V
0.795
0.790
V_BATT = 2.4V
0.785
0.780
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G23
V_MAX Output Voltage
(Battery Powered)
3.5
PWRON = 2V
3.0
2.5
PWRON = 0V
2.0
1.5
1.0
0.5
V_MAX OUTPUT CURRENT = 0.5mA
0
1.6 1.8 2 2.2 2.4 2.6 2.8
V_BATT (V)
3 3.2
3456 G26
USB Undervoltage Lockout
4.10
4.05
RISING
4.00
3.95
FALLING
3.90
3.85
3.80
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G21
WALLFB Trip Point
1.28
1.26
RISING
1.24
FALLING
1.22
1.20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G24
V_MAX Output Voltage
(USB/Wall Powered)
6
V_MAX OUTPUT CURRENT = 0.5mA
5
PWRON = 0V, 2V
4
3
2
1
0
4 4.25 4.5 4.75 5
V_EXT (V)
5.25 5.5
3456 G27
3456fa
7