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LTC4076 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4076
Description  Dual Input Standalone Li-Ion Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4076 Datasheet(HTML) 9 Page - Linear Technology

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LTC4076
9
4076fa
The LTC4076 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 LTC4076 has two internal P-channel power MOSFETs
and thermal regulation circuitry. No blocking diodes or
external sense resistors are required.
Power Source Selection
The LTC4076 can charge a battery from either the wall
adapterinputortheUSBportinput.TheLTC4076automati-
cally senses the presence of voltage at each input. If both
power sources are present, the LTC4076 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.
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
(
)
(
)
BB
HPWR LOW
(
)
=
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
))
, ( 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
gg from USB
ply
HPWR LOW
sup ,
)
=
Programming Charge Termination
The charge cycle terminates when the charge current falls
below the programmed termination threshold during con-
stant-voltage mode. This threshold is set by connecting an
external resistor, RITERM, from the ITERM pin to ground.
The charge termination current threshold (ITERMINATE) is
set by the following equation:
R
V
I
I
V
R
ITERM
TERMINATE
TERMINATE
ITERM
=
=
100
100
,
OPERATIO


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