Datasheet

LTC3554/LTC3554-1/
LTC3554-2/LTC3554-3
7
3554123fd
V
BUS
Supply Current
vs Temperature
V
BUS
Supply Current
vs Temperature (Suspend Mode)
Battery Drain Current
vs Temperature
V
BUS
Current Limit
vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C, unless otherwise specified.
TEMPERATURE (°C)
–75
200
I
BUS
(µA)
300
350
400
–25
25
50 150
3554 G01
250
–50 0
75
100
125
V
BUS
= 5V
HPWR = L
TEMPERATURE (°C)
–75
0
I
BUS
(µA)
10
15
25
20
–25
25
50 150
3554 G02
5
–50 0
75
100
125
V
BUS
= 5V
TEMPERATURE (°C)
–75 –50 –25 25 50 75 100 1250
0
BATTERY DRAIN CURRENT (µA)
4
6
10
14
12
8
3554 G03
2
BOTH REGULATORS DISABLED
ONE REGULATOR ENABLED
HARD RESET
BOTH REGULATORS
ENABLED
V
BAT
= 3.8V
STBY = 3.8V
REGULATORS LOAD = 0mA
TEMPERATURE (°C)
–75
0
I
BAT
(µA)
2
3
5
4
–25
25
50 150
3554 G03b
1
–50 0
75
100
125
V
BUS
= 5V
V
BAT
= 3.8V
TEMPERATURE (°C)
–75
0
I
VBUS
(mA)
200
300
500
400
–25
25
50
3554 G04
100
–50 0
75
100
125
V
BUS
= 5V
HPWR = H
HPWR = L
Battery Drain Current
vs Temperature (Suspend Mode)
LOAD CURRENT (mA)
0 100 300 500400200
–100
CURRENT (mA)
100
200
400
600
500
300
3554 G05
0
R
PROG
= 1.87k
I
VBUS
I
LOAD
I
BAT
(CHARGING)
I
BAT
(DISCHARGING)
V
BUS
and Battery Current
vs Load Current
Battery Charge Current and
Voltage vs Time
(LTC3554/LTC3554-2/LTC3554-3)
R
ON
from V
BUS
to V
OUT
vs Temperature
Charge Current vs Temperature
(Thermal Regulation)
TEMPERATURE (°C)
–75 –50 –25 25 50 75 100 1501250
0.20
R
ON
(Ω)
0.30
0.35
0.45
0.50
0.40
3554 G05a
0.25
I
OUT
= 200mA
TEMPERATURE (°C)
–75
0
I
BAT
(mA)
160
240
480
400
320
–25
25
50 150
3554 G06
80
–50 0
75
100
125
V
BUS
= 5V
HPWR = H
R
PROG
= 1.87k
TIME (hour)
0
0
BATTERY CURRENT (mA)
VOLTAGE (V)
200
300
600
500
400
2
4
5
3554 G07
100
0
2
3
6
5
4
1
1 3
6
7
8
920mAhr CELL
V
BUS
= 5V
R
PROG
= 1.87k
CHRG
V
BAT
SAFETY TIMER
TERMINATION
C/10
I
BAT