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STMicroelectronics TSM101CD
- Part No.:
- TSM101CD
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TSM101CD.pdf
- Description:
- IC VREF SERIES 1.24V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,125
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Product details
Overview
TSM101CD 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 (1MHz GBW), a programmable 1.4mA current source with enable/disable control, 4.5–32V supply range, and SO8 package. It delivers precise CV/CC regulation in battery chargers and overvoltage protection circuits.
For engineers reviewing the TSM101CD datasheet, TSM101CD pinout, TSM101CD application, or TSM101CD equivalent, key selection criteria include reference accuracy (±1%), current-source temperature stability (500–600 ppm/°C), ORed amplifier output drive capability for optocoupler LED biasing, and validated use in 12V NiCd and 15V Li-ion charger designs.
Technical Context
The TSM101CD implements two independent control loops sharing a single 1.24V reference: one compares scaled output voltage (via R6/R7 divider) to Vref using Op-Amp A; the other compares sense-resistor voltage (Crin) to Vref via Op-Amp B. Their outputs are ORed through internal diodes to a common open-collector OUTPUT pin driving an optocoupler LED.
A dedicated current generator (Io = 1.4mA, enabled when Csen < 0.6V) injects offset current into the Crin node, allowing dynamic adjustment of current-limit threshold without changing hardware. The device operates across -20°C to +80°C and supports supply voltages up to 32V with thermal shutdown protection at 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref Accuracy | 1.24V ±1% (TSM101A grade); enables ±15mV voltage regulation tolerance at 15V output |
| Supply Range | 4.5V to 32V DC; supports wide-input SMPS including universal AC/DC adapters |
| Current Source | 1.4mA ±10%; provides 140mV offset across 100Ω resistor to shift charge current from 700mA to 200mA |
| Op-Amp GBW | 1MHz; sufficient for stable closed-loop response in 100kHz flyback converters |
| Input Offset Voltage | ±7mV max; limits voltage regulation error to ≤0.06% of 15V output |
| Line Regulation | 3.5–10mV over 5–32V supply; ensures consistent reference stability despite input ripple |
| Temp Stability | 30–120ppm/°C (Vref), 500–600ppm/°C (Io); defines worst-case drift over full operating range |
Pinout & Package
SO8 (Plastic Micropackage), 150°C max junction temperature, 130–200°C/W θJA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Vref) | Voltage Reference Output | 1.24V ±1% source; drives external resistor dividers; not short-circuit protected |
| 2 (Csen) | Current Source Enable Input | Logic-low (<0.6V) activates 1.4mA sink; high (>2V) disables; used for dual-current battery charging |
| 3 (Crref) | Current Limit Reference Input | Connects to voltage divider (R2/R3) setting current threshold; referenced to GND |
| 4 (GND) | Ground Reference | Common return for all analog functions; must be low-impedance connection to power ground |
| 5 (Crin) | Current Sense Input | Receives voltage from sense resistor (R5); compared against Crref to trigger current limiting |
| 6 (OUTPUT) | ORed Amplifier Output | Open-collector NPN output; sinks up to 15mA to drive optocoupler LED directly |
| 7 (Vrin) | Voltage Regulation Input | Receives scaled output voltage (R6/R7); compared against Vref to maintain constant voltage |
| 8 (Vcc) | Power Supply Input | 4.5–32V DC supply; powers all internal blocks; bypass capacitor required at pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent control loops | Simultaneous voltage regulation and current limiting with shared 1.24V reference reduces component count vs. discrete TL431 + comparator solutions |
| ORed amplifier outputs | Single OUTPUT pin drives optocoupler LED regardless of which loop (voltage or current) asserts control-no external logic required |
| Enableable current source | 1.4mA sink on Csen pin allows software-selectable charge current (e.g., 700mA → 200mA) by grounding pin 2 |
| High-precision reference | 1.24V ±1% (TSM101A grade) with 30ppm/°C tempco enables ±15mV regulation accuracy over industrial temperature range |
| Wide supply compatibility | 4.5–32V operation supports both low-voltage battery systems and high-voltage industrial SMPS without auxiliary regulators |
Applications
| 12V NiCd Battery Charger | 15V Li-ion Charger with Dual Current Profile |
|---|---|
|
Use Scenario: Charging sealed NiCd batteries requiring strict 1.45V/cell end-of-charge voltage and 700mA/200mA selectable current. IC Role / Device Role / Timing Role: Secondary-side voltage/current controller providing isolated feedback to primary PWM via optocoupler. Use Value: Eliminates need for separate TL431 and comparator; achieves ±1% voltage regulation and <5% current limit accuracy with single IC. |
Use Scenario: Fast-charging Li-ion packs where initial CC phase uses 1A and taper phase switches to 200mA at cell voltage >4.2V. IC Role / Device Role / Timing Role: Dual-loop regulator with Csen pin enabling current step-down via external comparator signal. Use Value: Enables adaptive charging without microcontroller; current source offset modifies Crin threshold dynamically during charge cycle. |
| Voltage Supervisor for 24V Industrial PSU | Overvoltage Protection in Flyback Adapter |
|
Use Scenario: Monitoring 24V rail in PLC power supply to assert shutdown if voltage exceeds 26.5V for >10ms. IC Role / Device Role / Timing Role: Precision voltage comparator using Vrin input and internal 1.24V reference; OUTPUT drives latch circuit. Use Value: Replaces discrete Zener + transistor OVP with 0.5% trip accuracy and no calibration needed. |
Use Scenario: Preventing damage to downstream loads during flyback transformer saturation or optocoupler failure. IC Role / Device Role / Timing Role: Secondary-side OVP monitor comparing output to fixed threshold; triggers immediate OUTPUT pull-down. Use Value: Provides fail-safe protection independent of primary-side controller; responds within 1µs due to 1MHz op-amp bandwidth. |
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 + LM393 | Discrete solution: TL431 (2.5V ref) + dual comparator; requires external resistors, diodes, and pull-up for OR logic | Lacks integrated current source; cannot implement programmable current offset without extra transistors | Choose when cost sensitivity outweighs board space and design time; adds ≥5 passive components |
| UC3907 | Dedicated battery charger controller with 1.25V ref, but no integrated current source; requires external MOSFET for current limiting | Designed specifically for lead-acid; lacks Csen pin functionality for dual-current profiles | Prefer for automotive SLI battery systems where SMBus interface and thermal foldback are required |
Compared with TL431+LM393 and UC3907, the TSM101CD reduces bill-of-materials by 7 components, enables seamless current-profile switching via a single digital signal, and maintains tighter voltage regulation (±1% vs. ±2%) across temperature without trimming.
Availability
TSM101CD is available at Aetrix Electronics and suitable for battery chargers, industrial power supplies, voltage supervisors, and overvoltage protection circuits requiring stable component supply and long-term manufacturability.
Supply support for TSM101CD 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 products for industrial, automotive, and consumer markets.
The TSM101 series belongs to ST's Power Management Analog portfolio, engineered specifically for secondary-side feedback in isolated DC-DC converters-emphasizing integration, precision, and reliability in cost-sensitive power applications.
FAQ
What is the maximum output current the TSM101CD can sink at the OUTPUT pin?
The OUTPUT pin is an open-collector NPN transistor rated for 15mA sink current at 25°C with Vol ≤ 2.5V. This is sufficient to drive standard PC817 or SFH615A optocouplers directly without external buffering. Derating applies above 85°C ambient; consult Figure 7 in the datasheet for thermal curves.
Can the TSM101CD operate with a 3.3V supply?
No-the absolute minimum supply voltage is 4.5V per Absolute Maximum Ratings. Below this, the internal bandgap reference and op-amps fail to bias correctly, resulting in undefined Vref and non-functional control loops. For 3.3V systems, consider a level-shifting auxiliary supply or alternative controller like TLV431.
How does the Csen pin affect current regulation accuracy?
When Csen is pulled low (<0.6V), the 1.4mA current source injects offset current into Crin, effectively lowering the sensed voltage threshold by Voffset = R4 × 1.4mA. This shifts the current limit point linearly; accuracy depends on R4 tolerance and Io tempco (500–600 ppm/°C), not on Vref stability.
Is the TSM101CD pin-compatible with the TSM101ID?
Yes-both share identical SO8 pinout and electrical specifications. The only difference is temperature grade: TSM101CD is rated for -20°C to +80°C, while TSM101ID extends to -40°C to +105°C. No layout or schematic changes are needed when upgrading for extended temperature operation.
TSM101CD 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:
- -20°C ~ 80°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TSM101CD FAQ
1.How can I place an order for TSM101CD through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM101CD 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 TSM101CD reliable?
The price and inventory of TSM101CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM101CD is usually 5 days.
3.What payment methods are accepted for TSM101CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM101CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM101CD?
TSM101CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM101CD 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 TSM101CD?
For technical support, including TSM101CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM101CD requirements.
6.How does Aetrix verify that TSM101CD is sourced from the original manufacturer or authorized distributors?
All TSM101CD 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 TSM101CD meets industry standards.
7.What is the process for return or replacement of TSM101CD?
All TSM101CD units undergo pre-shipment inspection (PSI). If there is an issue with TSM101CD, 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 TSM101CD part is unused and in its original packaging.
Return procedure for TSM101CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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