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LTC4079 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4079
Description  60V, 250mA Linear Charger with Low Quiescent Current
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4079 Datasheet(HTML) 9 Page - Linear Technology

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LTC4079
9
4079f
For more information www.linear.com/LTC4079
operaTion
The LTC4079 is a full featured constant-current, constant-
voltage charger designed to charge multiple chemistry
types of batteries from voltage sources up to 60V. The low
quiescent current of the device minimizes power drain on
the source and the battery, making it suitable for a variety
of applications including backup and energy harvesting
from an intermittent power source. The battery charge
voltage is set using an external resistor divider. Charge
duration can be set using a capacitor on the TIMER pin.
For safety and improved battery life, the LTC4079 includes
a thermistor input for temperature qualified charging.
Charge current starts when the EN pin is brought above
1.190V. Figure 2 shows a flow chart of the primary states
and state transitions of the LTC4079. A typical charge
cycle includes:
1. Constant-Current (CC) Charging: The programmed
charge current is used to charge the battery until the
battery voltage reaches the charge voltage set using
the feedback divider. For a low ESR battery, this mode
provides the bulk of the charge. The charge timer should
generally be set long enough to charge the battery above
the recharge threshold, otherwise another charge cycle
would immediately follow.
2. Constant-Voltage (CV) Charging: Once the battery
reaches the set charge voltage, constant voltage is
maintained across the battery by controlling the charge
current. The charge current reduces with time in this mode
as the battery nears its full charge capacity.
3.ChargingTermination:TheLTC4079canbeconfigured
to terminate charging automatically based on time or
current. The CHRG status pin goes to high impedance
when the charge current reduces below 1/10th of the
programmed current, indicating that the battery is almost
fully charged. The charge current continues to top-off the
batteryuntilthetimerterminatesthechargecurrent.Timer
termination can be disabled by connecting the TIMER
pin to ground. In this case, charging terminates when
the charge current falls below 1/10th of the programmed
charge current.
A 6ms filter (tTERMINATE) is used on the C/10 detector to
prevent premature termination due to transient loads on
the battery during charging.
4. Automatic Recharge: When VBAT drops below the
recharge threshold (97.6% of the charge voltage),
whether by battery drainage or replacement of the
battery, the charger automatically re-engages and starts
charging.
Setting The Battery Charge Voltage
The battery charge voltage is set by connecting a resistor
divider from the battery to the FB and FBG pins as shown
in Figure 3. The charge voltage is determined as follows:
VCHG =1.170V • 1+
RFB1
RFB2 +RFBG


where RFB1 is the resistor from BAT to FB, RFB2 is the
resistor from FB to FBG and RFBG is the resistance of the
internal switch of the FBG pin (160Ω typical).
+
BAT
FB
LTC4079
RFB1
RFB2
4079 F03
BATTERY
FBG
ENABLE
Figure 3. Setting the Battery Charge Voltage
Setting and Monitoring the Charge Current
The charge current delivered to the battery in constant-
current mode, ICHG is set using a resistor from the PROG
pintoground.Thevalueofthisresistoriscalculatedusing:
RPROG =
297.5V
ICHG


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