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LP28501 датащи(PDF) 9 Page - Lowpower Semiconductor inc

номер детали LP28501
подробное описание детали  3.5A Synchronous Buck Li-ion Charger With Intelligent Path Management and Adapter Adaptive
PDF  10 Pages
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производитель  POWER [Lowpower Semiconductor inc]
домашняя страница  http://www.lowpowersemi.com
Logo POWER - Lowpower Semiconductor inc

LP28501 датащи(HTML) 9 Page - Lowpower Semiconductor inc

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LP28501-02
Mar.-2017
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 9 of 10
Preliminary Datasheet
LP28501
Battery Temperature Detection
The
LP28501
continuously
monitors
battery
temperature by measuring the voltage between the
NTC pins and ground, typically determined by a
negative temperature coefficient thermistor and an
external voltage divider. The device compares this
voltage against its internal thresholds to determine if
charging is allowed. To initiate a charge cycle, the
battery temperature must be within the VLTF to VHTF
thresholds. There is a constant current source in
NTC which is 100uA(INTC)flowing out form this pin.
So VNTC is INTC×RNTC.
When the NTC fault occurs, the STAT pin will blink to
indicate the fault.
Input Current LIMIT on ILIM and ISET
For safe operation, the LP28501 has an additional
hardware pin on ILIM to limit maximum input current
on ILIM pin. The input maximum current is set by a
resistor from ILIM pin to ground as:
ISET ramming Charge Current
The charge current is RISET rammed using a single
resistor from the ISET pin to ground. The battery
charge current is 1000 times the current out of the
ISET pin. The ISET ram resistor and the charge
current are calculated using the following equations:
Note: VRISET is 1.5Volts when VBAT>VTRIKL.



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