STMicroelectronics TSM102IDT

Overview

TSM102IDT from STMicroelectronics is a monolithic voltage and current controller IC integrating two operational amplifiers, two comparators, and a precision adjustable voltage reference (2.5 V, ±0.4% initial accuracy, 22 ppm/°C TC) in a single SO-16 package. It operates from 3 V to 36 V supply, draws only 1.5 mA total supply current, supports rail-to-rail input common-mode range including ground, and delivers low output saturation voltage (250 mV at 4 mA sink). It is used in SMPS battery chargers for simultaneous voltage regulation, current limiting, low-battery detection, and end-of-charge signaling.

For engineers reviewing the TSM102IDT datasheet, TSM102IDT pinout, TSM102IDT application, or TSM102IDT equivalent, key selection criteria include its integrated multi-function architecture, guaranteed 0.4% reference accuracy over temperature, dual op-amp gain-bandwidth product of 2.1 MHz, comparator response time down to 300 ns, and SO-16 thermal resistance of 150 °C/W for power supply management in space-constrained industrial and portable systems.

Technical Context

The TSM102IDT implements a fully integrated analog control subsystem: its two op-amps provide independent voltage and current error amplification with 25 V/mV large-signal gain and 1.6–2 V/µs slew rate; its two comparators feature TTL-compatible inputs, 300 ns large-signal response, and built-in hysteresis support via external feedback. The internal 2.5 V reference offers adjustable output up to 36 V via external resistors and maintains ±7 mV deviation over –40°C to +125°C.

All functional blocks share a common 3–36 V supply rail and operate across –40°C to +125°C ambient. The device uses bipolar process technology, enabling input common-mode voltage range from V_CC– to (V_CC+ – 1.8 V), rail-to-rail output swing capability, and robust latch-up immunity-critical for isolated feedback loops in flyback and forward converters.

Key Specifications

Pinout & Package

Package: SO-16 (Plastic Micropackage), 150 °C/W junction-to-ambient thermal resistance, body dimensions 10.0 × 6.2 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL494CDR and UC3843BD1R2G, the TSM102IDT uniquely integrates precision reference, dual error amplifiers, and dual comparators - enabling complete analog control of both voltage and current in battery chargers without supplemental ICs or trimming components.

Availability

TSM102IDT is available at Aetrix Electronics and suitable for lithium-ion battery chargers, industrial SMPS feedback controllers, programmable lab power supplies, and UPS battery management units requiring stable component supply, long-term lifecycle support, and guaranteed parametric consistency across production batches.

Supply support for TSM102IDT 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, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The TSM102IDT belongs to ST's analog power management portfolio, engineered specifically for compact, high-precision power supply control in battery-powered and isolated DC-DC applications - emphasizing integration, thermal robustness, and production-ready accuracy.

FAQ

What is the maximum allowable supply voltage for TSM102IDT?

The absolute maximum DC supply voltage is 36 V across V_CC+ and V_CC–, with continuous operation rated from 3 V to 36 V. Exceeding 36 V risks permanent damage to internal bipolar junctions. Derating is not required up to 125°C ambient, but thermal design must maintain junction temperature below 150°C using the specified 150 °C/W θ_JA.

Can TSM102IDT drive an optocoupler directly?

Yes - each comparator output sinks up to 16 mA, sufficient to drive standard PC817 or SFH615A optocouplers at 5–10 mA LED current without external buffering. For reliable switching, connect the optocoupler anode to V_CC+ and cathode to comparator output (pin 7 or 14), with no series resistor needed if V_CC+ ≤ 12 V and CTR ≥ 100%.

How is the reference voltage adjusted beyond 2.5 V?

The internal 2.5 V reference appears at pin 8 (cathode). To generate higher voltages, connect an external resistor divider between pin 8 and V_CC+, then feed the divider midpoint back to pin 2 or pin 6. Output voltage follows V_OUT = 2.5 × (1 + R1/R2), where R2 connects from pin 8 to GND and R1 from V_OUT to V_CC+. Max output is 36 V with ≥1 mA cathode current.

Does TSM102IDT require external compensation components?

Yes - each op-amp requires external compensation. For voltage regulation loop (op-amp 2), use capacitor C1 (1–10 nF) from pin 1 to pin 2. For current regulation loop (op-amp 1), use capacitor C2 (1–10 nF) from pin 11 to pin 10. These stabilize the feedback paths against phase shift introduced by transformer leakage inductance and output capacitance in SMPS designs.