STMicroelectronics TSM102AIDT

Overview

TSM102AIDT from STMicroelectronics is a monolithic voltage and current controller IC integrating two operational amplifiers, two comparators, and a precision adjustable voltage reference (2.500 V typ., ±0.4% initial accuracy) in a single SO-16 package. It operates from 3 V to 36 V supply, delivers 2.1 MHz gain-bandwidth, supports 1–100 mA sink current, and enables dual-loop battery charger control with low-level output saturation (250 mV at 4 mA).

For engineers reviewing the TSM102AIDT datasheet, TSM102AIDT pinout, TSM102AIDT application, or TSM102AIDT equivalent, key selection considerations include its integrated analog functions for SMPS secondary-side regulation, guaranteed operation over –40°C to +125°C, 10 µV/°C input offset drift, and compatibility with lithium-ion battery charging topologies requiring voltage/current monitoring and end-of-charge detection.

Technical Context

The TSM102A implements a fully integrated analog front-end for power management: its two op-amps provide independent voltage and current error amplification with 25 V/mV large-signal gain and 2.1 MHz GBP; its two comparators deliver fast response (300 ns large-signal) with rail-to-rail input common-mode range (0 V to V_CC–2 V) and programmable hysteresis.

The on-chip 2.5 V reference offers adjustable output up to 36 V via external resistor divider, 7 mV max total temperature deviation (–40°C to +125°C), ±22 ppm/°C tempco, and 1.5–3 µA input current - enabling precise, stable feedback across wide input and load conditions without external references.

Key Specifications

Pinout & Package

SO-16 plastic micropackage (JEDEC MS-012AC), 10.0 mm × 6.2 mm body, 1.27 mm pitch, 1.75 mm height, rated for –40°C to +125°C operating temperature.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage/current controller applications.

Compared with TL494CN and UC3843BD1R2G, the TSM102AIDT uniquely integrates all analog functions required for autonomous secondary-side regulation - eliminating external reference ICs, op-amps, and comparator bias networks while maintaining ±0.4% reference accuracy and sub-microsecond fault response.

Availability

TSM102AIDT is available at Aetrix Electronics and suitable for lithium-ion battery chargers, isolated SMPS secondary-side controllers, industrial power monitors, and multi-channel reference sources requiring stable component supply with guaranteed long-term availability.

Supply support for TSM102AIDT 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, Switzerland, specializing in analog, power, microcontrollers, and automotive ICs with over 40 years of industrial-grade product development.

The TSM102A belongs to ST's power management analog portfolio, designed specifically for space-constrained, high-precision power supply monitoring and battery charging applications requiring integrated signal conditioning and reference stability.

FAQ

What is the maximum cathode current the TSM102A reference can sink while maintaining 2.5 V accuracy?

The TSM102A reference guarantees 2.500 V ±0.4% output with cathode current from 1 mA to 100 mA. At 100 mA, the reference maintains regulation with ≤250 mV dropout (V_KA – V_REF) and ≤30 mV total temperature-induced deviation across –40°C to +125°C, as verified in Figure 1 and Table 4 of the official datasheet.

Can the TSM102AIDT operate from a 3.3 V supply?

Yes - the absolute minimum supply voltage is 3 V per Absolute Maximum Ratings (page 2). At 3.3 V, both op-amps retain full rail-to-rail input common-mode range (0 V to 1.3 V), comparators function with 300 ns response, and the reference delivers 2.5 V with 1.5 µA input current, enabling low-voltage battery monitor applications.

How is the 0.4% reference accuracy achieved without external trimming?

The 0.4% initial accuracy is factory-laser-trimmed at wafer level using ST's proprietary precision voltage reference process. No external components or user calibration are required - the specification holds over temperature (–40°C to +125°C) and supply (3 V to 36 V) per Electrical Characteristics Table 4 (page 4).

Does the TSM102AIDT support hysteresis on both comparators?

Yes - both comparators accept external positive feedback via dedicated pins (e.g., Pin 10 for Comparator A, Pin 13 for Comparator B) as shown in Application Note AN2025. Hysteresis resistors (e.g., R20) connect between output and non-inverting input, enabling configurable threshold windows for robust low-battery and end-of-charge detection.