TPS65010 datasheet(19/50 Pages) TI

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DETAILED DESCRIPTION

BATTERY CHARGER

Charge Voltage

Charge Current

Current Regulation

Phase

Voltage Regulation and Charge

Termination Phase

Regulation Voltage

Regulation Current

Minimum Charge

Voltage

Preconditioning

and Taper Detect

Pre-

Conditioning

Phase

t(PRECHG)

t(TAPER)

t(CHG)

Autonomous Power Source Selection

Temperature Qualification

TPS65010

SLVS149A – JUNE 2003 – REVISED JANUARY 2004

The TPS65010 supports a precision Li-Ion or Li-Polymer charging system suitable for single-cells with either

coke or graphite anodes. Charging the battery is possible even without the application processor being powered

up. The TPS65010 starts charging when an input voltage on either ac or USB input is present, which is greater

than the charger UVLO threshold. See Figure 27 for a typical charge profile.

Figure 27. Typical Charging Profile

Per default the TPS65010 attempts to charge from the ac input. If ac input is not present, the USB is selected. If

both inputs are available, the ac input has priority. The charge current is initially limited to 100 mA when charging

from the USB input. This can be increased to 500 mA via the serial interface. The charger can be completely

disabled via the interface, and it is also possible just to disable charging from the USB port. The start of the

charging process from the USB port is delayed in order to allow the application processor time to disable USB

charging, for instance if a USB OTG port is recognized. The recommended input voltage for charging from the ac

input is 4.5 V < VAC < 5.5 V. However, the TPS65010 is capable of withstanding (but not charging from) up to 20

V. Charging is disabled if VAC is greater than typically 6.6 V.

The TPS65010 continuously monitors battery temperature by measuring the voltage between the TS and AGND

pins. An internal current source provides the bias for most common 10K negative-temperature coefficient

thermistors (NTC) (see Figure 28). The IC compares the voltage on the TS pin against the internal V(LTF) and

V(HTF) thresholds to determine if charging is allowed. Once a temperature outside the V(LTF) and V(HTF) thresholds

is detected the IC immediately suspends the charge. The IC suspends charge by turning off the power FET and

holding the timer value (i.e., timers are not reset). Charge is resumed when the temperature returns to the

normal range.

The allowed temperature range for 103AT type thermistor is 0

°C to 45°C. However the user may modify these

thresholds by adding two external resistors. See Figure 29.

TPS65010 Datasheet(PDF) 19 Page - Texas Instruments

TPS65010 Datasheet(HTML) 19 Page - Texas Instruments

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