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LTC4077 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4077
Description  Dual Input Standalone Li-Ion Battery Charger
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4077 Datasheet(HTML) 9 Page - Linear Technology

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LTC4077
9
4077fa
The LTC4077 is designed to efficiently manage charging of
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 950mA of charge current from the wall
adapter supply or up to 650mA of charge current from the
USB supply with a final float voltage accuracy of ±0.6%.
The LTC4077 has two internal P-channel power MOSFETs
and thermal regulation circuitry. No blocking diodes or
external sense resistors are required.
Power Source Selection
The LTC4077 can charge a battery from either the wall
adapterinputortheUSBportinput.TheLTC4077automati-
cally senses the presence of voltage at each input. If both
power sources are present, the LTC4077 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
50mV (180mV rising, 50mV falling).
The open drain power status output (PWR) indicates that
sufficientpowerisavailable.Table1describesthebehavior
of this status output.
Table 1. Power Source Selection
VUSBIN > 3.95V and
VUSBIN < 3.95V or
VUSBIN > BAT + 50mV
VUSBIN < BAT + 50mV
VDCIN > 4.15V and
Device powered from
Device powered from
VDCIN > BAT + 50mV
wall adapter source;
wall adapter source
USBIN current < 25µA
PWR: LOW
PWR: LOW
VDCIN < 4.15V or
Device powered from
No charging
VDCIN < BAT + 50mV
USB source;
PWR: LOW
PWR: Hi-Z
Programming and Monitoring Charge Current
The charge current delivered to the battery from the wall
adaptersupplyisprogrammedusingasingleresistorfrom
the IDC pin to ground. Likewise, the charge current from
the USB supply is programmed using a single resistor
from the IUSB pin to ground if HPWR is set on its high
logic state or from the IUSBL pin to ground if HPWR is
set on its low logic state or it is left floating. The program
resistor and the charge current (ICHRG) are calculated
using the following equations:
R
V
I
I
V
R
R
IDC
CHRG DC
CHRG DC
IDC
IUS
=
=
1000
1000
( )
( )
,
BB
CHRG USB
CHRG USB
IUSB
IU
V
I
I
V
R
R
=
=
1000
1000
(
)
(
)
,
SSBL
CHRG USB
CHRG USB
IUSBL
V
I
I
V
R
=
=
200
200
(
)
(
)
,
Charge current out of the BAT pin can be determined at
any time by monitoring the IDC or IUSB pin voltage and
using the following equations:
I
V
R
ch
ing from wall adapter
BAT
IDC
IDC
=
, ( arg
1000
))
, (
I
V
R
BAT
IUSB
IUSB
=
1000 charging from USB supplly
HPWR
chargi
,
)
, (
=
=
high
I
V
R
BAT
IUSBL
IUSBL
200
nng from USB supply,
)
HPWR low
=
OPERATIO


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