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LTC4069EDC-TRPBF Datasheet(PDF) 11 Page - Linear Technology

Part # LTC4069EDC-TRPBF
Description  Standalone 750mA Li-Ion Battery Charger in 2 횞 2 DFN with NTC Thermistor Input
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4069EDC-TRPBF Datasheet(HTML) 11 Page - Linear Technology

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LTC4069
11
4069fb
OPERATION
4069 F03
RNOM
RNTC
VCC
+
TOO COLD
TOO HOT
NTC_ENABLE
0.76 • VCC
0.35 • VCC
0.016 • VCC
6
NTC
APPLICATIONS INFORMATION
Figure 3. NTC Circuit Information
Undervoltage Charge Current Limiting (UVCL)
The LTC4069 includes undervoltage charge (ΔVUVCL1)
current limiting that prevents full charge current until the
input supply voltage exceeds approximately 200mV above
the battery voltage. This feature is particularly useful if the
LTC4069 is powered from a supply with long leads (or any
relatively high output impedance).
For example, USB-powered systems tend to have highly
variable source impedances (due primarily to cable
quality and length). A transient load combined with such
impedance can easily trip the UVLO threshold and turn the
charger off unless undervoltage charge current limiting
is implemented.
Consider a situation where the LTC4069 is operating under
normal conditions and the input supply voltage begins to
droop (e.g., an external load drags the input supply down).
If the input voltage reaches VBAT + ΔVUVCL1(approximately
220mV above the battery voltage), undervoltage charge
current limiting will begin to reduce the charge current
in an attempt to maintain ΔVUVCL1 between the VCC input
and the BAT output of the IC. The LTC4069 will continue
to operate at the reduced charge current until the input
supply voltage is increased or constant voltage mode
reduces the charge current further.
Operation from Current Limited Wall Adapter
By using a current limited wall adapter as the input supply,
the LTC4069 dissipates significantly less power when
programmed for a current higher than the limit of the
supply as compared to using a non-current limited supply
at the same charge current.
Consider a situation where an application demands a
600mA charge current for an 800mAh Li-Ion battery. If a
typical 5V (non-current limited) input supply is used, the
charger’s peak power dissipation can exceed 1W.
Now consider the same scenario, but with a 5V input
supply with a 600mA current limit. To take advantage of
the current limited supply, it is necessary to program the
LTC4069 to charge at a current above 600mA. Assume
that the LTC4069 is programmed for 750mA (i.e.,
RPROG = 1.33k) to ensure that part tolerances maintain
a programmed current higher than 600mA. Since the


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