Datasheet

LTC3553
7
3553fb
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 specifi ed.
TEMPERATURE (°C)
–75
200
I
BUS
(µA)
300
350
400
–25
25
50 150
3553 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
3553 G02
5
–50 0
75
100
125
V
BUS
= 5V
TEMPERATURE (°C)
–75
0
I
BAT
(µA)
2
3
5
4
–25
25
50 150
3553 G04
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
3553 G05
100
–50 0
75
100
125
V
BUS
= 5V
HPWR = H
HPWR = L
Battery Drain Current
vs Temperature (Suspend Mode)
V
BUS
and Battery Current
vs Load Current
Battery Charge Current and
Voltage vs Time
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
()
0.30
0.35
0.45
0.50
0.40
3553 G07
0.25
I
OUT
= 200mA
TEMPERATURE (°C)
–50 –30 –10 30 50 70 90 13011010
0
BATTERY DRAIN CURRENT (µA)
4
6
10
18
16
14
12
8
3553 G03
2
BUCK AND LDO ON
V
BAT
= 3.8V
STBY = 3.8V
REGULATORS LOAD = 0mA
ONLY LDO ON
ONLY BUCK ON
BUCK AND LDO OFF
HARD RESET
LOAD CURRENT (mA)
0 100 300 500400200
–100
CURRENT (mA)
100
200
400
600
500
300
3553 G06
0
R
PROG
= 1.87k
I
VBUS
I
LOAD
I
BAT
(CHARGING)
I
BAT
(DISCHARGING)
TEMPERATURE (°C)
–75
0
I
BAT
(mA)
160
240
480
400
320
–25
25
50 150
3553 G08
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
3553 G09
100
0
2
3
6
5
4
1
13
6
7
8
920mAhr CELL
V
BUS
= 5V
R
PROG
= 1.87k
CHRG
V
BAT
SAFETY TIMER
TERMINATION
C/10
I
BAT