STMicroelectronics TSM1014ID

Overview

TSM1014ID from STMicroelectronics is a dual-loop SMPS controller IC for secondary-side CV/CC regulation in flyback adapters and battery chargers, integrating a 1.25 V ±1% voltage reference, two transconductance op-amps (Gm = 0.5–1 mA/mV), and current-sink outputs with 250–400 mV low-level output voltage at 5 mA sink. It operates from 4.5 V to 28 V supply and supports -40 °C to +105 °C industrial temperature range.

For engineers reviewing the TSM1014ID datasheet, TSM1014ID pinout, TSM1014ID application, or TSM1014ID equivalent, this device is selected for precision dual-loop feedback where low quiescent current (100–180 µA), high AC mains rejection (65–100 dB), and ESD-hardened (2 kV HBM) operation are required in compact adapter and charger designs.

Technical Context

The TSM1014ID implements two independent transconductance amplifiers: one configured as a voltage controller (CV- and CVOUT pins) using the internal 1.25 V reference, and another as a current limiter (Cc- and Cc+ pins) with external sense resistor biasing. Both amplifiers share a common current-sink output stage (CCOUT and CVOUT tied internally), enabling OR logic for automatic CV/CC mode transition.

Its internal Zener clamp limits VCC to 28 V under transient overvoltage, and its low input bias current (20–150 nA) enables high-impedance resistor networks (e.g., ≥100 kΩ) for precise voltage division without loading error. Compensation is fully accessible via external RC networks on both amplifier inputs and outputs.

Key Specifications

Pinout & Package

Package: SO-8 (ECOPACK® compliant, 175 °C/W junction-to-ambient thermal resistance).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-loop SMPS feedback applications.

Compared with TL431+LM358 and UCC3803-1, the TSM1014ID delivers integrated dual-loop control in one SO-8 package with guaranteed reference accuracy, matched op-amp performance, and built-in protection-reducing design risk and validation time for certified adapter and charger products.

Availability

TSM1014ID is available at Aetrix Electronics and suitable for USB-C PD adapters, lithium-ion battery chargers, and industrial AC/DC power supplies requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for TSM1014ID 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 microcontrollers, power ICs, sensors, and analog devices for automotive, industrial, and consumer markets.

The TSM1014ID belongs to ST's power management analog portfolio, specifically engineered for secondary-side feedback in isolated flyback converters-targeting high-accuracy, low-component-count, and energy-efficient adapter and battery charger systems.

FAQ

What is the function of the shared CCOUT and CVOUT pins?

CCOUT and CVOUT are internally ORed current-sink outputs driving a single optocoupler LED. When either the voltage or current loop demands regulation, its respective op-amp pulls current through the shared output node, activating the optocoupler to reduce primary-side duty cycle-enabling seamless CV-to-CC transition without external logic.

Can TSM1014ID operate below 4.5 V supply?

No. The absolute minimum VCC is 4.5 V per operating conditions (Table 4). Below this, internal reference and op-amp biasing become unstable, causing loss of regulation and unpredictable output behavior. Startup must ensure auxiliary supply reaches ≥4.5 V before regulation begins.

How does the internal 1.25 V reference achieve 1% tolerance in TSM1014ID?

The 1% tolerance is achieved through laser-trimmed thin-film resistors in the bandgap reference circuit during final test. This trim compensates for process variation, resulting in a guaranteed 1.238–1.262 V output at 25 °C and ≤30 mV deviation over full temperature range (-40 to +105 °C).

Is external compensation mandatory for stable operation?

Yes. Both op-amps require external compensation (e.g., 2.2 nF + 22 kΩ series network) connected between output and inverting input. Without it, phase margin drops below 30°, causing oscillation in CV or CC loops-especially under light-load or fast-transient conditions.