LTC3456_15 Datasheet, PDF (6/28 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.
V_BATT Pin Current when USB or
Wall Powered
4 _{VEXT = 5V}
3
2
1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G10
SW2_BST Current Limit
950
V_BATT = 2.4V
925
900
875
850
825
800
775
750
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G13
V_INT Load Current
vs Start-Up Battery Voltage
300
RESISTOR LOAD
250
200
150
100
50
0
1.80 2.00 2.20 2.40 2.60 2.80 3.00 3.20
V_BATT (V)
!"#$ /$
6
No Load V_EXT Suppy Current when
USB or Wall Powered
2.0
FB1 = 1V
CORE CONVERTER
NOT SWITCHING
1.6
1.2
0.8
0.4
0
4 4.25 4.5 4.75 5
V_EXT (V)
5.25 5.5
3456 G11
SW2_BK Current Limit
600
V_EXT = 5V
575
550
525
500
475
450
425
400
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G14
Maximum V_MAIN Load Current
Capability (Output 4% Below
Regulation)
700
L = 4.7µH
(BATTERY POWERED)
600
500
400
300
200
100
1.8 2
2.2 2.4 2.6 2.8
V_BATT (V)
3 3.2
3456 G17
SW1 Current Limit
800
700
600
V_EXT = 5V
500
V_BATT = 2.4V
400
300
200
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G12
Hot Swap (HSO) Current Limit
200
V_BATT = 2.4V
175
150
125
100
75
50
25
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3456 G15
Maximum V_CORE Load Current
Capability (Output 4% Below
Regulation)
600
L = 10µH
(BATTERY POWERED)
500
V_CORE = 1.5V
400
V_CORE = 1.8V
300
200
100
0
1.8 2
2.2 2.4 2.6 2.8
V_BATT (V)
3 3.2
3456 G18
3456fa