LTC3554-3_15 Datasheet, PDF (7/36 Pages) Linear Technology – Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators

LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
Typical Performance Characteristics T_A = 25°C, unless otherwise specified.
V_BUS Supply Current
vs Temperature
400 _{VBUS = 5V}
HPWR = L
350
300
250
200
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3554 G01
Battery Drain Current
vs Temperature (Suspend Mode)
5
V_BUS = 5V
V_BAT = 3.8V
4
3
2
1
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3554 G03b
R_ON from V_BUS to V_OUT
vs Temperature
0.50
I_OUT = 200mA
0.45
0.40
V_BUS Supply Current
vs Temperature (Suspend Mode)
25
V_BUS = 5V
20
15
10
5
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3554 G02
Battery Drain Current
vs Temperature
14
V_BAT = 3.8V
STBY = 3.8V
12 _{REGULATORS LOAD = 0mA}
10
BOTH REGULATORS
ENABLED
8
ONE REGULATOR ENABLED
6
BOTH REGULATORS DISABLED
4
2
HARD RESET
0
–75 –50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3554 G03
V_BUS Current Limit
vs Temperature
500
V_BUS = 5V
HPWR = H
400
300
V_BUS and Battery Current
vs Load Current
600
R_PROG = 1.87k
500
I_VBUS
400
I_LOAD
300
200
HPWR = L
100
0
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3554 G04
200
100
0
–100
0
I_BAT
(CHARGING)
I_BAT
(DISCHARGING)
100 200 300 400 500
LOAD CURRENT (mA)
3554 G05
Charge Current vs Temperature
(Thermal Regulation)
480
400
320
Battery Charge Current and
Voltage vs Time
(LTC3554/LTC3554-2/LTC3554-3)
600 _{920mAhr CELL}
6
V_BUS = 5V
CHRG
500 ^RPROG ^{= 1.87k}
5
V_BAT
400
4
0.35
240
0.30
160
300
3
SAFETY TIMER
TERMINATION
200
2
0.25
0.20
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3554 G05a
80 VBUS = 5V
HPWR = H
R_PROG = 1.87k
0
–75 –50 –25 0
25 50 75 100 125 150
TEMPERATURE (°C)
3554 G06
100
1
C/10
I_BAT
0
0
012 34 56 7 8
TIME (hour)
3554 G07
3554123ff
7