Texas Instruments BQ500100DCKT

Overview

BQ500100DCKT from Texas Instruments is a high-side current-sense amplifier optimized for foreign object detection (FOD) in wireless power transmitters. It features 0 V to 20 V common-mode input range, fixed 50 V/V gain, ±150 μV max offset voltage, ±2% max gain error over temperature, and operates from 2.7 V to 6 V supply - enabling accurate shunt-based current monitoring on high-voltage rails (e.g., 5–19 V coil supplies) in Qi-compliant 5 W/15 W systems.

For engineers reviewing the BQ500100DCKT datasheet, BQ500100DCKT pinout, BQ500100DCKT application, or BQ500100DCKT equivalent, this device is selected specifically for unidirectional high-common-mode current sensing where supply voltage is decoupled from sensed rail voltage, low quiescent current (≤100 μA), SC70-6 packaging, and FOD-critical timing accuracy in WPC 1.2 transmitter designs.

Technical Context

The BQ500100DCKT employs a proprietary high-voltage input stage that isolates common-mode voltages up to 20 V from its 2.7–6 V supply rail, eliminating sequencing constraints and enabling operation even when input voltage exceeds V+. Its 120 dB typical common-mode rejection ratio ensures stable output under dynamic rail voltage modulation used for power regulation in resonant wireless charging topologies.

It delivers 80 kHz bandwidth and 0.4 V/μs slew rate to track fast transient coil currents while maintaining ≤15 mV peak-to-peak I_SENSE ripple after external RC filtering. The device's RTI voltage noise density of 25 nV/√Hz and ±0.1 μV/V PSR support sub-2.3% total current measurement error at 1 A with 20 mΩ shunt - meeting WPC 1.2 FOD response latency and accuracy requirements.

Key Specifications

Pinout & Package

Package: SC70-6 (DCK), 2.00 mm × 1.25 mm body, 0.65 mm pin pitch, moisture sensitivity level 2 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current sensing applications.

Compared with INA240A1DRCR and MAX40010FAUT#, the BQ500100DCKT delivers optimal balance of ultra-low quiescent current (100 μA), precise 50 V/V gain for 10-mV shunts, and integrated FOD application guidance - making it the most efficient and design-accelerated choice for WPC-compliant wireless power transmitters.

Availability

BQ500100DCKT is available at Aetrix Electronics and suitable for wireless power transmitter design, foreign object detection subsystems, and high-common-mode current monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant SC70 packaging.

Supply support for BQ500100DCKT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions, with leadership in power management, signal chain, and wireless connectivity technologies.

The BQ500100DCKT belongs to TI's wireless power transmitter IC portfolio, engineered specifically to address foreign object detection, efficiency optimization, and regulatory compliance (WPC Qi 1.2) in contactless charging systems.

FAQ

What is the maximum common-mode voltage the BQ500100DCKT can handle?

The BQ500100DCKT supports a common-mode input voltage range of 0 V to 20 V, as specified in its electrical characteristics table. This allows direct sensing on high-voltage rails such as 19 V wireless power bridge supplies while operating from a lower 3.3 V or 5 V supply. The device maintains functionality even when input common-mode voltage exceeds V+, and it tolerates up to 26 V absolute maximum per pin with current limiting.

Does the BQ500100DCKT require power-supply sequencing relative to the sensed rail?

No - the BQ500100DCKT does not require supply sequencing. Its input stage is designed to tolerate 0–20 V common-mode voltage on IN+ and IN– pins before V+ is applied. This eliminates startup timing constraints in multi-rail wireless power systems and ensures reliable operation during brown-out or staggered power-up sequences commonly found in transmitter designs.

Can the BQ500100DCKT be used for bidirectional current sensing?

The BQ500100DCKT is specified for unidirectional current sensing only, as confirmed by its functional description and normal operation conditions requiring current flow from IN+ to IN–. Its output swing is referenced to GND and V+, and it does not support negative differential input voltages. For bidirectional applications, TI recommends alternatives like the INA226 or similar devices explicitly rated for bipolar operation.

What shunt resistor value is recommended for use with the BQ500100DCKT in a 1-A wireless charging application?

A 20 mΩ shunt resistor is recommended for 1-A applications, as validated in the BQ500100DCKT datasheet's typical application section. This value limits power dissipation to 20 mW at 1 A while enabling full-scale 10-mV differential input - which the BQ500100DCKT amplifies to 500 mV output. Using this value achieves ≤2.22% total measurement error, meeting WPC 1.2 FOD accuracy targets.

Is the BQ500100DCKT pin-compatible with other members of the bq500xx family?

No - the BQ500100DCKT is not pin-compatible with bq500101 or bq501210. While all share the SC70-6 package, their pin functions differ: bq500101 includes I²C interface pins not present on BQ500100DCKT, and bq501210 integrates additional control logic. The BQ500100DCKT has dedicated IN+, IN–, OUT, V+, and dual GND pins - a configuration unique to its analog-only, high-precision FOD sensing role.