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STMicroelectronics TSM101ACDT
- Part No.:
- TSM101ACDT
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TSM101ACDT.pdf
- Description:
- IC VREF SERIES 1% 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,757
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Product details
Overview
TSM101ACDT from STMicroelectronics is a precision voltage and current controller IC integrating a 1.24V ±1% bandgap reference, two ORed operational amplifiers (1MHz GBW), and an enableable 1.4mA current source - all in an SO-8 package. It serves as secondary-side feedback controller in isolated SMPS battery chargers, delivering simultaneous CV/CC regulation with optocoupler-driven PWM control.
For engineers reviewing the TSM101ACDT datasheet, TSM101ACDT pinout, TSM101ACDT application, or TSM101ACDT equivalent, key selection criteria include its dual-loop error amplification architecture, 4.5–32V supply range, 1.24V reference accuracy, built-in current-source offset capability for multi-stage charging, and SO-8 thermal performance under continuous 10mA reference load.
Technical Context
The device implements two independent error amplifiers whose outputs are logically ORed (via internal diodes) to drive a single open-collector output stage capable of sinking ≥15mA at 2.5V. This architecture ensures fail-safe priority: current-limit loop dominates voltage-regulation loop when both are active.
Its integrated 1.24V reference exhibits ≤100ppm/°C temperature drift and ≤15mV load regulation (1–10mA), while the current generator enables precise charge-current adjustment via pin 2 (Csen) - activated below 0.6V, disabled above 2V - allowing dynamic offset of the current-sense voltage by up to 140mV using external R4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Reference | 1.24V ±1% (TSM101A grade), enabling 1.5% end-of-charge voltage accuracy in battery chargers |
| Supply Voltage Range | 4.5V to 32V DC - supports wide-input SMPS designs including universal AC adapters and industrial power supplies |
| Reference Output Current | 10mA max - sufficient to bias standard resistor-divider networks without external buffering |
| Op-Amp Gain-Bandwidth | 1MHz - provides stable loop compensation for typical flyback converters operating up to 500kHz |
| Current Source Accuracy | 1.4mA ±15%, enabling predictable 200mA–700mA charge-current offsets via 100Ω–68Ω R4 resistors |
| Input Offset Voltage | ±7mV - ensures <10mV sensing error in current loops using 200mV across R5 |
| Common-Mode Rejection | 80dB - maintains regulation integrity despite ground noise in high-side sense configurations |
Pinout & Package
SO-8 (Plastic Micropackage), 150°C max junction temperature, θJA = 130–200°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Vref) | Voltage Reference Output | 1.24V precision reference node; must not be shorted; drives R6/R7 divider for voltage feedback |
| 2 (Csen) | Current Source Enable Input | Logic-level control: ≤0.6V enables 1.4mA sink; ≥2V disables; used to switch between charge profiles |
| 3 (Crref) | Current Limit Reference Input | Reference node for current-loop op-amp; sets threshold via R2/R3 divider tied to sense resistor R5 |
| 4 (GND) | Analog Ground | Common return for reference, amplifiers, and current source; must be star-connected to minimize noise coupling |
| 5 (Crin) | Current Sense Input | Inverting input of current-loop op-amp; connected directly to low-side of R5 for accurate current measurement |
| 6 (OUTPUT) | ORed Amplifier Output | Open-collector output driving optocoupler LED; sinks ≥15mA to reduce primary-side PWM duty cycle |
| 7 (Vrin) | Voltage Regulation Input | Inverting input of voltage-loop op-amp; connected to R6/R7 divider tap for output voltage sampling |
| 8 (Vcc) | Power Supply Input | 4.5–32V supply rail; requires local 10µF bypass (C4) due to internal reference and amplifier quiescent current |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent error amplifiers with ORed output | Ensures current-limit priority over voltage regulation - critical for safe battery charging and overload protection |
| Enableable 1.4mA current source | Allows programmable current-offset without external DAC or microcontroller; supports dual-rate NiCd/NiMH charging |
| 1.24V ±1% internal reference | Eliminates need for external precision reference; achieves ≤1.5% total output voltage tolerance in production chargers |
| 4.5–32V wide supply range | Operates directly from SMPS auxiliary winding or post-regulated rail - no LDO required for 12V/24V systems |
| SO-8 and DIP-8 packaging | Enables drop-in replacement of TL431-based designs while adding current control; SO-8 supports automated assembly |
Applications
| Battery Charger (CV/CC) | Voltage Supervisor |
|---|---|
|
Use Scenario: 12V NiCd/NiMH battery charger with 700mA fast-charge and 200mA trickle-charge modes. IC Role / Device Role / Timing Role: Secondary-side voltage/current feedback controller interfacing via optocoupler to primary PWM IC. Use Value: Enables precise 1.45V/cell end-of-charge voltage and programmable current offset without MCU intervention. |
Use Scenario: Overvoltage protection circuit monitoring 5V/12V/24V rails in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Precision comparator with internal reference detecting >5.1V on 5V rail. Use Value: Delivers 1% trip threshold accuracy over -40°C to +105°C using only passive components. |
| SMPS Feedback Controller | Current-Limited Linear Regulator |
|
Use Scenario: Isolated 15V/1A flyback adapter requiring tight output regulation and short-circuit foldback. IC Role / Device Role / Timing Role: Dual-loop error amplifier generating optocoupler drive signal for UC384x primary controller. Use Value: Provides inherent current limiting that activates before primary MOSFET failure, improving system robustness. |
Use Scenario: 5V/500mA linear regulator for analog sensor front-end requiring <10mV load regulation. IC Role / Device Role / Timing Role: Precision reference and current-limited error amplifier driving pass transistor base. Use Value: Achieves 0.5% output accuracy with built-in current limit, eliminating separate current-sense IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage and current controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AILP | Single shunt reference only; no current source or dual op-amps; requires external op-amps for current sensing | Lacks integrated current-loop control; suitable only for voltage-only regulation | Select when cost sensitivity outweighs need for integrated CC functionality |
| UC3907DW | Dedicated battery charger controller with integrated MOSFET drivers; higher pin count; no internal reference | Targets high-power Li-ion systems with SMBus interface; not pin-compatible | Select for multi-cell Li-ion with state-of-charge management, not for simple NiCd/NiMH CV/CC |
Compared with TL431AILP and UC3907DW, TSM101ACDT uniquely integrates reference, dual error amplifiers, and programmable current source in SO-8 - reducing BOM count by 3–5 components while enabling seamless CV/CC transition in cost-sensitive battery chargers.
Availability
TSM101ACDT is available at Aetrix Electronics and suitable for battery chargers, isolated SMPS feedback circuits, voltage supervisors, and current-limited linear regulators requiring stable component supply across automotive, industrial, and consumer OEM programs.
Supply support for TSM101ACDT 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, power, and microcontroller solutions for industrial, automotive, and consumer markets.
The TSM101 series belongs to ST's Power Management Analog portfolio, specifically engineered for secondary-side feedback control in cost-sensitive isolated power supplies - emphasizing integration, reliability, and ease of use in battery charging and adapter applications.
FAQ
What is the maximum output current capability of the TSM101ACDT's reference pin (Pin 1)?
The Vref pin delivers up to 10mA continuously at 1.24V with ≤15mV load regulation. Exceeding this current causes reference voltage droop and compromises CV accuracy. For higher loads, buffer with a unity-gain op-amp or add a 1kΩ series resistor with local decoupling.
Can the TSM101ACDT operate with a 3.3V supply?
No - the absolute minimum supply voltage is 4.5V per datasheet specifications. At 3.3V, the internal bandgap reference fails to regulate, op-amps saturate, and the current source becomes inactive. Use a dedicated LDO or auxiliary winding to ensure ≥4.5V at Pin 8.
How does the ORed output architecture affect loop stability in SMPS designs?
The internal diode-OR forces the more negative amplifier output to dominate, ensuring current-limit loop overrides voltage loop during overload. This avoids conflicting signals but requires careful compensation: C2/C3 (100nF) must be placed close to Pins 6/7 to damp high-frequency peaking caused by optocoupler CTR variation.
Is the TSM101ACDT RoHS compliant and halogen-free?
Yes - TSM101ACDT is manufactured in ST's RoHS-compliant, halogen-free SO-8 package (ECOPACK2). The device meets JEDEC J-STD-020 moisture sensitivity level MSL3 and supports lead-free reflow profiles up to 260°C peak.
TSM101ACDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.5V ~ 32V
- Current - Supply:
- 2mA
- Current - Cathode:
- -
- Operating Temperature:
- -20°C ~ 80°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TSM101ACDT FAQ
1.How can I place an order for TSM101ACDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM101ACDT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TSM101ACDT reliable?
The price and inventory of TSM101ACDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM101ACDT is usually 5 days.
3.What payment methods are accepted for TSM101ACDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM101ACDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM101ACDT?
TSM101ACDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM101ACDT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TSM101ACDT?
For technical support, including TSM101ACDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM101ACDT requirements.
6.How does Aetrix verify that TSM101ACDT is sourced from the original manufacturer or authorized distributors?
All TSM101ACDT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TSM101ACDT meets industry standards.
7.What is the process for return or replacement of TSM101ACDT?
All TSM101ACDT units undergo pre-shipment inspection (PSI). If there is an issue with TSM101ACDT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TSM101ACDT part is unused and in its original packaging.
Return procedure for TSM101ACDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TSM101ACDT Tags
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