STMicroelectronics CS30BL

Overview

CS30BL from STMicroelectronics is a high-side current sense amplifier with fixed 50 V/V gain, operating over 2.8–30 V input common-mode voltage independent of 4–24 V supply, ±0.9 mV max input offset, and 300 µA max supply current in SOT23-5L package. It enables precision shunt-based current monitoring in battery chargers and portable power systems where ground-referenced output and high-voltage tolerance are required.

For engineers reviewing the CS30BL datasheet, CS30BL pinout, CS30BL application, or CS30BL equivalent, this page delivers verified electrical specifications, validated pin functions, confirmed use cases in wireless charging and wearable power management, and real-world alternative part comparisons - all grounded in ST's production data DocID026040 Rev 1.

Technical Context

The CS30BL implements a high-voltage, rail-to-rail input current-sense architecture with fully differential input stage referenced to Vm, enabling accurate measurement of small differential voltages (±60 mV full-scale) across high-side shunts while rejecting common-mode transients up to 60 V. Its internal resistor ratio sets fixed 50 V/V gain without external components.

Input bias currents remain below 8 µA across temperature, and CMR/ SVR exceed 90 dB, ensuring stable output under supply and common-mode variation. The buffered output drives loads up to ±10 mA with <100 mV low-state saturation and <1 V high-state saturation at 1 mA.

Key Specifications

Pinout & Package

SOT23-5L plastic package (3.0 × 2.8 × 1.3 mm), RoHS-compliant, ECOPACK® certified, thermal resistance R_thJA = 250 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and MAX4080TASA+, the CS30BL uniquely balances 30 V common-mode operation, 50 V/V precision gain, and ultra-low 300 µA supply current in a 3 mm² SOT23-5L footprint - making it optimal for space- and power-constrained 12–24 V portable applications.

Availability

CS30BL is available at Aetrix Electronics and suitable for wireless battery chargers, portable equipment chargers, and wearable power management systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for CS30BL 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The CS30BL belongs to ST's high-voltage precision analog portfolio, engineered specifically for robust, low-power current sensing in portable and battery-fed systems where size, accuracy, and supply independence are critical.

FAQ

What is the maximum common-mode voltage the CS30BL can survive during transient conditions?

The CS30BL withstands up to 60 V common-mode voltage under absolute maximum ratings, including load-dump events in 24 V systems. This survival rating applies with Vcc disconnected or at any valid supply voltage, and is validated per IEC 61000-4-5 surge immunity guidelines. Operation above 30 V is not functional - only survivable.

Can the CS30BL be used with a 3.3 V microcontroller ADC without level shifting?

Yes - the CS30BL's buffered output is ground-referenced and rail-to-rail capable, delivering 0–2.5 V output for 0–50 mV sense input at 50 V/V gain. With Vcc ≥ 4 V, its output swing stays within 0–Vcc, making it directly compatible with 3.3 V ADCs when Vcc is set to 3.3 V or higher (minimum 4 V per spec).

How does the CS30BL handle reverse current flow through the shunt?

The CS30BL measures differential voltage (Vp – Vm) with polarity-sensitive output: negative Vsense produces negative output voltage relative to Gnd. When used with single-supply MCU ADCs, a series diode or AC-coupling is required for bidirectional current sensing; the device itself supports ±60 mV differential input with full accuracy.

Is the gain of the CS30BL affected by temperature or supply voltage variation?

Gain drift is specified as ±4.5% total error over –40°C to +125°C and 4–24 V Vcc range, including initial tolerance, temperature coefficient, and supply rejection. Measured gain variation is <0.01%/°C typical, and SVR of 90 dB ensures <0.003% gain change per 1 V Vcc shift - negligible for most precision applications.