Datasheet

LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
8
3554123fd
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C, unless otherwise specified.
Forward Voltage
vs Ideal Diode Current
V
BUS
Connect Waveform
V
BUS
Disconnect Waveform
I
BAT
(mA)
0 400200
0
V
FWD
(mV)
100
150
250
300
200
1000 1200
3554 G11
50
800600
V
BUS
= 5V
V
BUS
= 0V
V
BAT
= 3.75V
I
OUT
= 100mA
R
PROG
= 2k
1ms/DIV
5V
5V
V
BUS
V
OUT
0
0
0A
0A
I
BUS
0.5A/DIV
I
BAT
0.5A/DIV
3554 G12
V
BAT
= 3.75V
I
OUT
= 100mA
R
PROG
= 2k
3554 G13
50µs/DIV
5V
5V
V
BUS
V
OUT
0
0
0A
0A
I
BUS
0.5A/DIV
I
BAT
0.5A/DIV
Oscillator Frequency
vs Temperature
Switching from Suspend Mode to
500mA Mode
V
BAT
= 3.75V
I
OUT
= 50mA
R
PROG
= 2k
3554 G15
1ms/DIV
5V
5V
SUSP
V
OUT
0
0
0A
0A
I
BUS
0.5A/DIV
I
BAT
0.5A/DIV
Switching from 100mA Mode to
500mA Mode
V
BAT
= 3.75V
I
OUT
= 50mA
R
PROG
= 2k
3554 G14
1ms/DIV
5V
HPWR
0
0A
0A
I
BUS
0.5A/DIV
I
BAT
0.5A/DIV
TEMPERATURE (°C)
–75 –50 –25 25 50 75 100 1501250
1.9
OSCILLATOR FREQUENCY (MHz)
2.1
2.2
2.4
2.6
2.5
2.3
3554 G16
2.0
2.7V
3.8V
5.5V
I
BAT
vs V
BAT
(LTC3554/LTC3554-2/LTC3554-3)V
FLOAT
Load Regulation
Battery Regulation (Float)
Voltage vs Temperature
V
BAT
(V)
2 2.4 3.6 43.22.8
0
I
BAT
(mA)
200
300
500
400
3554 G10
100
4.4
V
BUS
= 5V
HPWR = H
R
PROG
= 1.87k
I
BAT
(mA)
0 50
4.08
V
FLOAT
(V)
4.12
4.14
4.22
4.20
4.18
4.16
200150 250 350 450
400
3554 G08
4.10
100 300
V
BUS
= 5V
HPWR = H
LTC3554/LTC3554-2/LTC3554-3
LTC3554-1
TEMPERATURE (°C)
–75 –25–50
4.08
V
FLOAT
(V)
4.16
4.18
4.22
4.20
50
100
125
3554 G09
4.14
4.12
4.10
250 75
V
BUS
= 5V
I
BAT
= 2mA
LTC3554/LTC3554-2/LTC3554-3
LTC3554-1