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LTC4078X Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4078X
Description  Dual Input Li-Ion Battery Charger with Overvoltage Protection
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4078X Datasheet(HTML) 9 Page - Linear Technology

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LTC4078/LTC4078X
9
4078xfb
OPERATION
The LTC4078/LTC4078X are designed to efficiently man-
age 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 850mA of charge current
from the USB supply with a final float voltage accuracy of
±0.6%. The LTC4078/LTC4078X have two internal P-chan-
nel power MOSFETs and thermal regulation circuitry. No
blocking diodes or external sense resistors are required.
Power Source Selection
The LTC4078/LTC4078X can charge a battery from ei-
ther the wall adapter input or the USB port input. The
LTC4078/LTC4078X automatically sense the presence of
voltage at each input. If both power sources are present,
the LTC4078/LTC4078X default to the wall adapter source
provided a valid voltage is present at the DCIN input. “Valid
voltage” is defined as:
• Supply voltage is greater than the UVLO threshold
and less than the OVLO threshold.
• Supply voltage is greater than the battery voltage by
40mV.
The open-drain power status output (PWR) indicates which
power source has been selected. Table 1 describes the
behavior of this status output.
Programming and Monitoring Charge Current
The charge current delivered to the battery from the wall
adapter or USB supply is programmed using a single re-
sistor from the IDC or IUSB pin to ground. Both program
resistors and charge currents (ICHRG) are calculated using
the following equations:
RIDC =
1000V
ICHRG DC
,ICHRG DC =
1000V
RIDC
RIUSB =
1000V
ICHRG USB
,ICHRG USB =
1000V
RIUSB
*Any external sources that hold the ITERM pin above 100mV will prevent the LTC4078X from
terminating a charge cycle.
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:
IBAT =
VIDC
RIDC
• 1000, (charging from wall adapter)
IBAT =
VIUSB
RIUSB
• 1000, (charging from USBsupply)
Battery Detection
By default, the BATDET pin is pulled high with an internal
resistor, disabling the charger. To enable the charger, the
BATDET pin must be pulled below the VBDET threshold
(typically 1.75V). An external resistor to ground less than
100k (typically 3.9k) located in the battery pack is used to
detect battery presence.
Programming Charge Termination
The charge cycle terminates when the charge current
falls below the programmed termination threshold level
during constant-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:
RITERM =
100V
ITERMINATE
,ITERMINATE =
100V
RITERM
The termination condition is detected using an internal
filtered comparator to monitor the ITERM pin. When the
ITERM pin voltage drops below 100mV* for longer than
tTERMINATE (typically 1.6ms), charging is terminated. The
charge current is latched off and the LTC4078/LTC4078X
enter standby mode.
When charging, transient loads on the BAT pin can cause
the ITERM pin to fall below 100mV for short periods of
time before the DC charge current has dropped below the


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