LTC3554-2_15 Datasheet, PDF (8/36 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_FLOAT Load Regulation
4.22
V_BUS = 5V
HPWR = H
4.20
LTC3554/LTC3554-2/LTC3554-3
4.18
4.16
Battery Regulation (Float)
Voltage vs Temperature
4.22 _{VBUS = 5V}
4.20 ^{IBAT = 2mA}
LTC3554/LTC3554-2/LTC3554-3
4.18
4.16
I_BAT vs V_BAT
(LTC3554/LTC3554-2/LTC3554-3)
500
V_BUS = 5V
HPWR = H
400 ^{RPROG = 1.87k}
300
4.14
4.14
200
4.12
4.12
LTC3554-1
LTC3554-1
100
4.10
4.10
4.08
0
50 100 150 200 250 300 350 400 450
I_BAT (mA)
3554 G08
4.08
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
3554 G09
0
2
2.4 2.8 3.2 3.6 4 4.4
V_BAT (V)
3554 G10
Forward Voltage
vs Ideal Diode Current
300
V_BUS Connect Waveform
250
V_BUS = 5V
200
5V
V_BUS
0
5V
V_{OUT 0}
150
V_BUS = 0V
I_BUS
0.5A/DIV
0A
100
50
0
0
I_{BAT 0A}
0.5A/DIV
200 400 600 800 1000 1200
I_BAT (mA)
V_BAT = 3.75V
I_OUT = 100mA
R_PROG = 2k
1ms/DIV
3554 G11
V_BUS Disconnect Waveform
3554 G12
5V
V_BUS
0
5V
V_{OUT 0}
I_BUS
0.5A/DIV
0A
I_BAT
0.5A/DIV ^0A
V_BAT = 3.75V
I_OUT = 100mA
R_PROG = 2k
50µs/DIV
3554 G13
Switching from 100mA Mode to
500mA Mode
Switching from Suspend Mode to
500mA Mode
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
5V
SUSP
0
5V
V_{OUT 0}
I_BUS
0.5A/DIV
0A
I_BAT
0.5A/DIV
0A
3554 G14
V_BAT = 3.75V
I_OUT = 50mA
R_PROG = 2k
1ms/DIV
3554 G15
Oscillator Frequency
vs Temperature
2.6
2.7V
2.5
3.8V
5.5V
2.4
2.3
2.2
2.1
2.0
1.9
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3554 G16
8
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