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BQ500100DCKT Datasheet(PDF) 7 Page - Texas Instruments

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Part # BQ500100DCKT
Description  High-Side Current Sensor for Wireless Charging
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

BQ500100DCKT Datasheet(HTML) 7 Page - Texas Instruments

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IN-
IN+
GND
V+
OUT
Bias
Gain = 50 V/V
Current-Sensing
Amplifier
bq500100
www.ti.com
SBOS765 – JANUARY 2016
7 Detailed Description
7.1 Overview
The bq500100 is specially-designed to facilitate foreign object detection (FOD) in wireless charging applications
by monitoring the coil supply current. The current-sensing amplifier is able to accurately measure voltages
developed across a current-sensing resistor on common-mode voltages that far exceed the supply voltage
powering the device. Current can be measured on input voltage rails as high as 20 V when the device is
powered off a lower supply voltage.
Low drift characteristics enables high-precision measurements with maximum input offset voltages as low as
200 µV with a maximum temperature contribution of 0.5 µV/°C over the full temperature range of –40°C to
+105°C.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 High Input Common-Mode Range
The bq500100 can support input common-mode voltages up to 20 V. Because of the internal topology, the
common-mode range is not restricted by the supply voltage as long as the input supply stays within the
operational range of 2.7 V to 6 V. The ability to operate with supply voltages lower than the input voltage
common-mode signal makes the device well-suited for monitoring the current in wireless charging applications
where the common-mode voltage varies to obtain a desired amount of power transfer.
When the dc common-mode voltage varies, the effect on the output voltage is very small as a result of the high
common-mode rejection. The dc common-mode rejection for the bq500100 is expressed in decibels and is
typically as high as 120 dB. In wireless charging applications, the current-sensed rail commonly varies in voltage
to adjust for the amount of power transferred by the coil.
7.3.2 High Current-Sense Accuracy Over a Wide Dynamic Range
The offset voltage, gain error, and shunt resistor are the three primary contributors that determine the current
measurement accuracy over a specified current range. The offset voltage dominates the error when operating at
low current values and the gain error dominates when operating at high current values. The low offset voltage
allows use of smaller shunt resistors values. Both the low offset and gain error allow the bq500100 to accurately
measure current over a wide dynamic range and still maintain a high level of accuracy.
Copyright © 2016, Texas Instruments Incorporated
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