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STMicroelectronics TSM101ID
- Part No.:
- TSM101ID
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TSM101ID.pdf
- Description:
- IC VREF SERIES 1.24V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,672
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Product details
Overview
TSM101ID from STMicroelectronics is a dual-loop voltage and current controller IC for secondary-side feedback in isolated SMPS, integrating a 1.24V ±1% precision bandgap reference, two ORed op-amps (1 MHz GBW), a programmable 1.4 mA current source with enable/disable control, 4.5–32 V supply range, and SO8 package. It is used in battery chargers to simultaneously regulate output voltage (e.g., 15.2 V) and limit charge current (e.g., 700 mA / 200 mA).
For engineers reviewing the TSM101ID datasheet, TSM101ID pinout, TSM101ID application, or TSM101ID equivalent, key selection concerns include its dual-loop error amplification architecture, optocoupler-compatible open-collector output, temperature-stable reference (≤100 ppm/°C), and pin-specific current-source enable threshold (0.6 V on Csen).
Technical Context
The TSM101ID implements two independent control loops-voltage regulation via Vrin/Crref comparison against the internal 1.24 V reference, and current limiting via Crin sensing-whose outputs are logically ORed through integrated diodes before driving the common OUTPUT pin. This enables fail-safe prioritization of current-limiting action over voltage regulation.
Its built-in current generator (Io = 1.4 mA, ±0.03 mA line regulation) injects an offset into the current-sense path when Csen < 0.6 V, allowing dynamic adjustment of charge current without external components. The reference exhibits ≤15 mV load regulation (1–10 mA) and ≤10 mV line regulation (5–32 V), supporting stable operation across wide input and output conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Reference | 1.24 V ±1% at 25°C; enables precise 1.45 V/cell NiCd end-of-charge voltage setting |
| Supply Voltage Range | 4.5–32 V DC; supports universal-input SMPS auxiliary supplies without external regulators |
| Op-Amp Gain-Bandwidth | 1 MHz; sufficient for stable closed-loop compensation up to ~100 kHz switching frequencies |
| Current Source Output | 1.4 mA ±0.2 mA; offsets sense-resistor voltage to switch between 700 mA and 200 mA charge profiles |
| Csen Enable Threshold | 0.6 V max; allows direct ground connection or logic-level control for current-source activation |
| Output Sink Current | 15 mA min at VOL = 2.5 V; drives standard optocoupler LEDs (e.g., PC817) without buffer transistors |
| Temperature Stability | ≤100 ppm/°C (TSM101I grade); ensures <±15 mV reference drift over –40°C to +105°C |
Pinout & Package
Package: SO8 (Plastic Micropackage), 5.0 mm × 6.2 mm body, 1.27 mm pitch, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vref (Pin 1) | Voltage Reference Output | 1.24 V precision reference; must not be shorted; sinks up to 10 mA for external biasing |
| Csen (Pin 2) | Current Source Enable Input | Logic-low (<0.6 V) activates 1.4 mA current source to offset current-sense measurement |
| Crref (Pin 3) | Current Limit Reference Input | Reference node for current loop op-amp; sets trip point via R2/R3 divider |
| GND (Pin 4) | Analog Ground | Common return for reference, op-amps, and current source; requires low-impedance PCB tie |
| Crin (Pin 5) | Current Sense Input | Connects to low-side shunt resistor; compared against Crref to trigger current limiting |
| OUTPUT (Pin 6) | ORed Error Amplifier Output | Open-collector output driving optocoupler LED; sinks up to 15 mA to reduce PWM duty cycle |
| Vrin (Pin 7) | Voltage Regulation Input | Connects to output voltage divider; compared against internal reference for CV mode |
| Vcc (Pin 8) | Power Supply Input | 4.5–32 V DC supply; powers all internal blocks; decoupling capacitor required at pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent control loops | Simultaneous voltage regulation and current limiting with hardware ORed output for priority-based fault response |
| Integrated 1.24 V reference | ±1% initial accuracy (TSM101A grade), ≤100 ppm/°C drift, eliminates need for external TL431 + resistors |
| Programmable current source | 1.4 mA source activated by Csen pin; enables two-stage charging (e.g., fast/float) without extra ICs |
| Optocoupler-ready output | Open-collector OUTPUT pin sinks 15 mA at 2.5 V, directly interfaces with PC817/PS2561 without level-shifting |
| Wide supply range | Operates from 4.5 V to 32 V, supporting 5 V auxiliary rails and high-voltage flyback secondaries |
Applications
| NiCd/NiMH Battery Charger | Isolated AC/DC Adapter |
|---|---|
|
Use Scenario: Charging 12 V NiCd battery packs with constant-voltage (15.2 V) and dual-current (700 mA / 200 mA) profiles. IC Role / Device Role / Timing Role: Secondary-side voltage/current controller providing optocoupler feedback to primary PWM IC. Use Value: Enables single-chip implementation of CC/CV charging with automatic current step-down at low cell voltage, improving battery lifetime. |
Use Scenario: Regulating 5 V/2 A output in universal-input offline flyback adapter with overcurrent protection. IC Role / Device Role / Timing Role: Dual-loop feedback controller maintaining tight output regulation while enforcing foldback current limiting during overload. Use Value: Eliminates need for separate TL431 and current-sense comparator, reducing BOM count and PCB area by 30%. |
| Voltage Supervisor with Current Foldback | Industrial SMPS Current Limiter |
|
Use Scenario: Monitoring 24 V DC power rail for overvoltage (>26 V) and overcurrent (>3 A) events in PLC I/O module. IC Role / Device Role / Timing Role: Precision reference and comparator IC triggering shutdown via optocoupler-coupled latch circuit. Use Value: Provides 1.24 V reference stability and 1 MHz op-amp bandwidth for fast response (<10 µs) to transient faults. |
Use Scenario: Adding accurate current limiting to legacy 48 V telecom rectifier using existing transformer and MOSFET. IC Role / Device Role / Timing Role: Secondary-side current limiter interfacing with primary-side PWM via optocoupler feedback path. Use Value: Achieves ±5% current limit accuracy across –40°C to +105°C, replacing discrete op-amp + shunt solutions. |
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 |
|---|---|---|---|
| TL431 + LM358 | Discrete solution: TL431 provides reference only; LM358 adds one op-amp; no integrated current source or OR logic. | Requires ≥4 external resistors and 2 capacitors to match TSM101ID's dual-loop function; no Csen-controlled current offset. | Select when design requires independent tuning of voltage and current loops or operates outside 4.5–32 V supply range. |
| UC3907 | Dedicated current-mode controller with 2.5 V reference, higher supply voltage (up to 40 V), but no integrated voltage reference or ORed output. | Designed for primary-side current sensing; lacks secondary-side optocoupler drive capability and dual-loop integration. | Select for high-power (>100 W) designs requiring primary-side current programming and thermal shutdown features. |
Compared with TL431+LM358, TSM101ID reduces component count by 60% and enables seamless current-profile switching; versus UC3907, it offers lower system cost and simpler layout for secondary-side regulated SMPS under 50 W.
Availability
TSM101ID is available at Aetrix Electronics and suitable for battery chargers, isolated AC/DC adapters, voltage supervisors, and industrial SMPS requiring stable component supply with guaranteed long-term continuity.
Supply support for TSM101ID 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, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
TSM101ID belongs to ST's Power Management Analog IC product line, engineered specifically for cost-sensitive, space-constrained isolated power supplies requiring integrated voltage and current regulation on the secondary side.
FAQ
What is the maximum output current the TSM101ID can sink on the OUTPUT pin?
The TSM101ID OUTPUT pin sinks up to 15 mA minimum at VOL = 2.5 V across the full operating temperature range (–40°C to +105°C). This is sufficient to drive standard optocouplers like PC817 or PS2561 directly without external transistors, enabling robust feedback to primary-side PWM controllers in isolated topologies.
How does the Csen pin control the internal current source?
The Csen pin enables the 1.4 mA current source when held below 0.6 V (typically grounded); it disables the source when pulled above 2.0 V (e.g., via 10 kΩ pull-up to Vcc). This allows simple two-state current limiting-e.g., 700 mA nominal charge current drops to 200 mA when Csen is grounded-without software or additional logic.
Can the TSM101ID replace a TL431 in existing designs?
Yes, but with circuit modifications: TSM101ID's Vrin and Crref pins require separate resistor dividers for voltage and current loops, unlike TL431's single reference input. Its OUTPUT pin replaces TL431's cathode/anode, and GND must be tied to the shunt resistor's low side. Layout changes are needed to accommodate the 8-pin SO8 footprint and dual-loop routing.
What is the temperature range supported by the TSM101ID part number?
The "I" suffix in TSM101ID denotes an industrial temperature range of –40°C to +105°C. This is validated across all key parameters-including reference voltage (1.24 V ±1%), current source (1.4 mA ±0.2 mA), and op-amp gain-bandwidth (1 MHz min)-ensuring reliable operation in demanding environments like telecom rectifiers and industrial battery systems.
TSM101ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- -
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.5V ~ 32V
- Current - Supply:
- 2mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TSM101ID FAQ
1.How can I place an order for TSM101ID through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM101ID 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 TSM101ID reliable?
The price and inventory of TSM101ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM101ID is usually 5 days.
3.What payment methods are accepted for TSM101ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM101ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM101ID?
TSM101ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM101ID 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 TSM101ID?
For technical support, including TSM101ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM101ID requirements.
6.How does Aetrix verify that TSM101ID is sourced from the original manufacturer or authorized distributors?
All TSM101ID 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 TSM101ID meets industry standards.
7.What is the process for return or replacement of TSM101ID?
All TSM101ID units undergo pre-shipment inspection (PSI). If there is an issue with TSM101ID, 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 TSM101ID part is unused and in its original packaging.
Return procedure for TSM101ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TSM101ID Tags
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