STMicroelectronics TSM1014IDT

Overview

TSM1014IDT from STMicroelectronics is a dual-op-amp-based CV/CC controller IC for secondary-side feedback in flyback SMPS, integrating a 1.25 V ±1% voltage reference, two transconductance op-amps (Gm = 0.5–1 mA/mV), and current-sink outputs. It enables precise constant-voltage (±1% VRef) and constant-current regulation in battery chargers and AC/DC adapters with <180 µA total supply current at 18 V.

For engineers reviewing the TSM1014IDT datasheet, TSM1014IDT pinout, TSM1014IDT application, or TSM1014IDT equivalent, this page delivers verified pin functions, real-world CV/CC loop design parameters, SO-8 package thermal data (Rthja = 175 °C/W), ESD rating (2 kV HBM), and validated alternatives for adapter and charger feedback systems.

Technical Context

The TSM1014IDT implements two independent transconductance amplifiers sharing a common current-sink output stage - enabling ORing behavior where either voltage or current error triggers optocoupler activation. Its internal 1.25 V reference feeds both amplifier inputs via external resistor networks to set VOUT and I_LIM.

Voltage control uses CV− and CVOUT pins with external RC compensation (e.g., 22 kΩ + 2.2 nF); current control uses Cc−, Cc+, and CCOUT with matched resistive sensing networks. The device operates from 4.5 V to 28 V (clamped internally), supports −40 °C to +105 °C, and achieves 65–100 dB supply rejection over its VCC range.

Key Specifications

Pinout & Package

Package: SO-8 (ECOPACK® compliant), surface-mount, 175 °C/W junction-to-ambient thermal resistance, 5.0 mm × 6.0 mm body size.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CV/CC controller applications.

Compared with TL431ACDBVR and UCC3803D, the TSM1014IDT uniquely integrates both CV and CC control paths with shared current-sink outputs in a single SO-8 package - reducing component count by up to 6 parts and eliminating inter-stage signal delay inherent in split-primary/secondary architectures.

Availability

TSM1014IDT is available at Aetrix Electronics and suitable for smartphone fast charging adapters, laptop AC/DC power adapters, and industrial battery maintenance chargers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TSM1014IDT 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, analog chips, and MEMS sensors for automotive, industrial, and consumer markets.

The TSM1014 belongs to ST's dedicated power management analog portfolio, engineered specifically for high-accuracy, low-component-count secondary-side regulation in cost-sensitive, space-constrained AC/DC and battery charging systems.

FAQ

What is the maximum VCC voltage the TSM1014IDT can tolerate?

The TSM1014IDT features an internal Zener clamp that limits VCC to 28 V under overvoltage conditions. Absolute maximum rating is −0.3 V to 28 V, with recommended operating range of 4.5 V to V_Z (28 V). Exceeding 28 V risks permanent damage even with short-duration transients.

Can the TSM1014IDT be used for primary-side regulation?

No - the TSM1014IDT is designed exclusively for secondary-side feedback in isolated topologies (e.g., flyback). Its current-sink outputs drive optocoupler LEDs, and its VRef and op-amps require galvanically isolated ground referencing. Primary-side use would violate functional architecture and damage the device.

How does the ORing function work between CV and CC loops?

Both CVOUT (Pin 5) and CCOUT (Pin 7) are open-drain current-sink outputs tied together externally (typically to optocoupler LED anode). When either op-amp detects error, it pulls current - activating the optocoupler. This hardware OR ensures immediate response if either voltage exceeds target or current exceeds limit, without software or logic gates.

Is there a version with tighter voltage reference tolerance?

Yes - the TSM1014AIDT variant offers 0.5% VRef tolerance (1.225–1.273 V) versus 1% for TSM1014IDT (1.238–1.262 V), confirmed in Table 5 of ST's DocID10694 Rev 3. Both share identical pinout, package, and functional architecture; only reference precision differs.