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LTC4097 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC4097
Description  USB/Wall Adapter Standalone Li-Ion/Polymer Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

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LTC4097
11
4097f
OPERATION
The LTC4097 is designed to efficiently manage charging
a single-cell lithium-ion battery from two separate power
sources: a wall adapter and USB power bus. Using the
constant-current/constant-voltage algorithm, the charger
can deliver up to 1.2A of charge current from the wall
adapter supply or up to 1A of charge current from the
USB supply with a final float voltage accuracy of ±0.6%.
The LTC4097 has two internal P-channel power MOSFETs,
thermal regulation and shut down circuitry. No blocking
diodes or external sense resistors are required.
Power Source Selection
The LTC4097 can charge a battery from either the wall
adapter input or the USB port input. The LTC4097 automati-
cally senses the presence of voltage at each input. If both
power sources are present, the LTC4097 defaults to the
wall adapter source provided sufficient power is present
at the DCIN input. “Sufficient power” is defined as:
• Supply voltage is greater than the UVLO threshold.
• Supply voltage is greater than the battery voltage by
30mV (100mV or 150mV rising, 30mV falling).
The VNTC output pin indicates that sufficient input voltage
is available. Table 1 describes the behavior of the power
source selection.
Table 1. Power Source Selection
VUSBIN > 4V and
VUSBIN > BAT + 30mV
VUSBIN < 4V or
VUSBIN < BAT + 30mV
VDCIN > 4.2V and
VDCIN > BAT + 30mV
Charger powered from
wall adapter source;
USBIN current < 25µA
Charger powered from
wall adapter source
VDCIN < 4.2V or
VDCIN < BAT + 30mV
Charger powered from
USB source
No charging
Programming and Monitoring Charge Current
The charge current delivered to the battery from the wall
adapter supply is programmed using a single resistor from
the IDC pin to ground.
R
V
I
I
V
R
IDC
CHRG DC
CHRG DC
IDC
==
1000
1000
()
()
,
Similarly, the charge current from the USB supply is
programmed using a single resistor from the IUSB pin
to ground. Setting HPWR pin to its high state will select
100% of the programmed charge current, while setting
HPWR to its low state will select 20% of the programmed
charge current.
R
V
I
HPWR
HIGH
I
IUSB
CHRG USB
CHRG USB
==
1000
()
()
()
===
=
1000
200
V
R
HPWR
HIGH
I
V
R
IUSB
CHRG USB
IUS
()
()
B
B
HPWR
LOW
()
=
Charge current out of the BAT pin can be determined at
any time by monitoring the IDC or IUSB pin voltage and
applying the following equations:
I
V
R
ch
ing from wall adapter
BAT
IDC
IDC
=
•, (
arg
1000
))
•,
(arg
sup
I
V
R
ch
ing from USB
p
BAT
IUSB
IUSB
=
1000
lly HPWR
HIGH
I
V
R
ch
in
BAT
IUSB
IUSB
,)
•,
(arg
=
=
200
g
g from USB
ply HPWR
LOW
sup
,
)
=


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