LTC3554 LINER [Linear Technology], LTC3554 Datasheet - Page 6

• Manufacturer Part Number: LTC3554
• Description: Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators
• Manufacturer: LINER [Linear Technology]

LTC3554
ELECTRICAL CHARACTERISTICS
Note 3. This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperatures will exceed 110°C when overtemperature protection is
active. Continuous operation above the specifi ed maximum operating
junction temperature may result in device degradation or failure.
Note 4. V
Note 5. Total Battery Drain Current is the sum of I
example, in applications where the buck input (BVIN pin) is connected
to the PowerPath output (V
drain current = I
Note 6. hC/10 is expressed as a fraction of programmed full charge
current with specifi ed PROG resistor.
Note 7. The current limit features of this part are intended to protect
the IC from short term or intermittent fault conditions. Continuous
TYPICAL PERFORMANCE CHARACTERISTICS
6
350
300
250
200
400
3
2
1
0
5
4
–75
–75
V
vs Temperature
Battery Drain Current
vs Temperature (Suspend Mode)
V
V
V
HPWR = L
CC
BUS
BUS
BUS
BAT
–50
–50
is the greater of V
= 3.8V
= 5V
= 5V
Supply Current
–25
–25
BATQ
TEMPERATURE (°C)
TEMPERATURE (°C)
0
0
+ I
BVIN
25
25
OUT
.
50
50
BUS
pin) such that I
75 100 125
75 100 125
or BAT.
3554 G03b
3554 G01
150
150
OUT
BATQ
= I
BVIN
and I
300
100
500
400
200
15
10
25
20
, total battery
0
–75
5
0
–75
V
vs Temperature
V
vs Temperature (Suspend Mode)
OUT.
V
V
BUS
BUS
BUS
BUS
–50
–50
= 5V
For
= 5V
Current Limit
Supply Current
–25
–25
TEMPERATURE (°C)
TEMPERATURE (°C)
0
0
25
25
operation above the absolute maximum specifi ed pin current rating may
result in device degradation or failure.
Note 8. FB High, Not Switching
Note 9. V
Note 10. PGOOD threshold is expressed as a percentage difference from
the buck regulation voltage. The threshold is measured with the buck
feedback pin voltage rising.
Note 11. See the Operation section of this data sheet for detailed
explanation of the pushbutton state machine and the effects of each
state on switching regulator and power manager operation.
Note 12. If V
the ideal diode is equal to its current times R
50
HPWR = L
HPWR = H
50
75 100 125
75
OUT
BUS
100 125
not in UVLO.
3554 G02
3554 G04
< V
T
150
A
UVLO
= 25°C, unless otherwise specifi ed.
then V
–100
200
600
500
400
300
100
14
12
10
0
6
2
0
8
4
–75 –50 –25
FWD
0
V
vs Load Current
Battery Drain Current
vs Temperature
R
V
STBY = 3.8V
REGULATORS LOAD = 0mA
BOTH REGULATORS
ENABLED
BUS
BAT
PROG
= 0 and the forward voltage across
= 3.8V
BOTH REGULATORS DISABLED
and Battery Current
100
= 1.87k
LOAD CURRENT (mA)
TEMPERATURE (°C)
DROPOUT
HARD RESET
200
0
ONE REGULATOR ENABLED
(DISCHARGING)
I
VBUS
25
I
.
LOAD
300
50
I
I
(CHARGING)
BAT
BAT
75
400
100 125
3554 G05
3554 G03
3554f
500