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

LTC3554
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise specified.
R_ON from V_BUS to V_OUT
vs Temperature
0.50
I_OUT = 200mA
0.45
0.40
Charge Current vs Temperature
(Thermal Regulation)
480
400
320
Battery Charge Current and
Voltage vs Time
600
6
920mAhr CELL
V_BUS = 5V
CHRG
500 ^RPROG ^{= 1.74k}
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 = 1.74k
0
–75 –50 –25 0
25 50 75 100 125 150
TEMPERATURE (°C)
3554 G06
V_FLOAT Load Regulation
4.204
4.202
V_BUS = 5V
HPWR = H
4.200
Battery Regulation (Float)
Voltage vs Temperature
4.250
V_BUS = 5V
I_BAT = 2mA
4.225
4.198
4.200
4.196
4.194
4.175
100
1
C/10
I_BAT
0
0
012 34 5 6 7 8
TIME (hour)
3554 G07
I_BAT vs V_BAT
500
V_BUS = 5V
HPWR = H
400 ^{RPROG = 1.74k}
300
200
100
4.192
0
50 100 150 200 250 300 350 400 450
I_BAT (mA)
3554 G08
4.150
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3554 G08
Forward Voltage
vs Ideal Diode Current
300
V_BUS Connect Waveform
250
V_BUS = 5V
200
5V
HPWR
0
5V
HPWR
0
150
V_BUS = 0V
I_BUS
0.5A/DIV
0A
100
50
0
0
I_BAT
0.5A/DIV
0A
200 400 600 800 1000 1200
I_BAT (mA)
V_BAT = 3.75V
I_OUT = 100mA
R_PROG = 2k
1ms/DIV
3554 G11
3554 G12
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
V_BAT (V)
3554 G10
V_BUS Disconnect Waveform
5V
HPWR
0
I_BUS
0.5A/DIV
0A
I_BAT
0.5A/DIV
0A
V_BAT = 3.75V
I_OUT = 50mA
R_PROG = 2k
1ms/DIV
3554 G14
3554p
7