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STMicroelectronics TSM108IDT
- Part No.:
- TSM108IDT
- Manufacturer:
- STMicroelectronics
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TSM108IDT.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,311
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Product details
Overview
TSM108IDT from STMicroelectronics is a high-voltage step-down PWM controller IC designed to drive external P-channel MOSFETs or PNP transistors in battery charger and DC/DC converter applications. It delivers precise constant-voltage (2.52 V ±70 mV) and constant-current (206 mV ±25 mV sense threshold) regulation, sustains 60 V transient input, and integrates UVLO (8–9 V), OVLO (32–35 V), and standby mode with 150 µA quiescent current.
For engineers reviewing the TSM108IDT datasheet, TSM108IDT pinout, TSM108IDT application, or TSM108IDT equivalent, key selection considerations include its 14-pin SO package, dual error amplifiers for independent CV/CC loops, 70–130 kHz adjustable switching frequency via OSC pin capacitor, and gate driver capable of 40 mA sink / 80 mA source into PMOS gates - critical for automotive 12 V accessory designs meeting load dump requirements.
Technical Context
The TSM108IDT implements a dual-loop control architecture: one error amplifier (VCTRL/VCOMP) compares a resistor-divided output voltage against a 2.52 V reference, while the second (ICTRL/ICOMP) compares the voltage across an external sense resistor against a 206 mV reference. Their outputs are diode-ORed to feed a sawtooth-based PWM comparator, enabling seamless transition between CV and CC modes during battery charging.
Its gate driver is a totem-pole stage with asymmetric turn-on/turn-off drive strength (15–40 mA sink vs. 30–80 mA source), integrated 12 V gate clamp, and compatibility with Ciss up to 1.5 nF. UVLO and OVLO thresholds are programmable via external resistive dividers using internal 184 kΩ/76.5 kΩ (UV) and 275 kΩ/23.2 kΩ (OV) divider networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Max | 60 V - withstands automotive load dump transients without external clamping |
| VREF | 2.52 V ±70 mV - sets regulated output voltage accuracy in CV mode |
| VSENSE | 206 mV ±25 mV - defines current limit threshold in CC mode |
| FOSC | 70–130 kHz - adjustable via external capacitor on OSC pin; typical 100 kHz for choke size/ripple trade-off |
| DMAX | 95% - limits duty cycle to prevent MOSFET linear-mode operation and thermal runaway |
| ISTBY | 150 µA - enables ultra-low-power inactive state while maintaining safe OFF-state lockout |
| UVLO Threshold | 8–9 V - disables operation below battery undervoltage; 200 mV hysteresis prevents oscillation |
| OVLO Threshold | 32–35 V - shuts down under overvoltage; 400 mV hysteresis ensures clean recovery |
Pinout & Package
Package: SO-14 (Plastic Micropackage), RoHS-compliant, rated for -40°C to +125°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | Power rail for logic and gate driver; supports 60 V transients |
| !STBY | Standby enable | TTL-compatible active-low input; forces full shutdown and reduces ICC to 150 µA |
| GND | Ground reference | Common return for gate drive current and signal ground |
| UV | UVLO sense | Input for programmable under-voltage lockout; internal 184 kΩ/76.5 kΩ divider |
| OV | OVLO sense | Input for programmable over-voltage lockout; internal 275 kΩ/23.2 kΩ divider |
| G | Internal ground tie | No external connection; internally bonded to GND |
| OSC | Oscillator timing | Connects external capacitor to set switching frequency (70–130 kHz) |
| VCOMP | Voltage loop output | Error amplifier output for CV loop; drives compensation network (e.g., 22 nF + 22 kΩ) |
| ICOMP | Current loop output | Error amplifier output for CC loop; same compensation topology as VCOMP |
| VREF | Reference output | Stable 2.52 V precision reference for both CV and CC comparators |
| VCTRL | CV inverting input | Connects to mid-point of output voltage divider for feedback |
| ICTRL | CC inverting input | Connects to sense resistor output side for current feedback |
| VS | Current sense input | Connects to sense resistor common node (choke side); referenced to ICTRL |
| GD | Gate driver output | Totem-pole output driving P-channel MOSFET gate; includes 12 V clamp |
Key Features
| Feature | Design Value |
|---|---|
| High-side current sensing | Direct VS/ICTRL interface enables accurate high-side shunt placement without level-shifting circuitry |
| Programmable UVLO/OVLO | Adjustable thresholds via external resistors preserve system safety while supporting custom battery voltage ranges |
| Integrated 2.52 V reference | ±2.8% tolerance over -25°C to +85°C enables <1% output voltage regulation with proper divider design |
| Asymmetric gate drive | Slower turn-on (via lower sink current) reduces inrush stress on MOSFET; faster turn-off minimizes conduction loss |
| Current foldback protection | -6 mV offset on current amplifier inputs limits charge current during low-battery or short-circuit conditions |
| Standby mode | Disables oscillator, error amps, and UVLO/OVLO comparators - maintains zero gate drive while cutting ICC to 150 µA |
Applications
| Automotive Cigarette Lighter Charger | 12 V to 6 V Battery Pre-regulator |
|---|---|
Use Scenario: Powering USB-charged devices from vehicle 12 V battery via cigarette lighter socket. IC Role / Device Role / Timing Role: Primary PWM controller regulating output voltage to 5–6 V and limiting charge current to 625 mA. Use Value: Meets ISO 7637-2 load dump immunity (60 V transient), eliminates need for external TVS, and enables compact PCB layout with minimal external components. | Use Scenario: Intermediate voltage regulation stage before LDO post-regulation in infotainment head units. IC Role / Device Role / Timing Role: Step-down controller delivering stable 6 V at up to 1 A to downstream LDOs and analog circuits. Use Value: Dual CV/CC loops prevent overvoltage damage during cold-crank (low VBAT) and overcurrent during hot-swap events. |
| Industrial 24 V DC/DC Converter | Portable Medical Device Charger |
Use Scenario: Converting 24 V industrial bus to 12 V for motor drivers and sensors. IC Role / Device Role / Timing Role: High-side switch controller managing external P-MOSFET with programmable OVLO set to 35 V. Use Value: 60 V VCC rating allows direct connection to unregulated 24 V rails with surge margin; UVLO prevents operation below 8 V during brownout. | Use Scenario: Charging sealed lead-acid or Li-ion packs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger IC controlling external P-MOSFET and sense resistor. Use Value: Current foldback (-6 mV offset) protects battery under low-VOUT fault conditions; standby mode extends device shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3843BD1R2G | Fixed 2.5 V reference; no integrated current sense amplifier; requires external op-amp for CC mode | Lacks native CC regulation - unsuitable for battery charging without added circuitry | Select only if CV-only regulation suffices and cost sensitivity outweighs design complexity |
| LM5002MM/NOPB | Higher 100 V VIN rating; integrated high-side N-MOSFET driver; no standalone CC loop | Designed for flyback/boost; not optimized for high-side P-MOSFET buck topologies | Prefer for higher-input-voltage isolated supplies, not automotive 12 V battery chargers |
Compared with UC3843BD1R2G and LM5002MM/NOPB, the TSM108IDT uniquely integrates dual independent CV/CC error amplifiers, 60 V rugged BCD process, and P-MOSFET-specific gate drive - making it the only drop-in solution for automotive-grade, single-stage CC/CV battery chargers requiring no external current-sense op-amps or level shifters.
Availability
TSM108IDT is available at Aetrix Electronics and suitable for automotive accessory power supplies, battery charger modules, and industrial DC/DC converters requiring stable component supply, extended temperature operation (-40°C to +125°C), and load-dump immunity.
Supply support for TSM108IDT 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, specializing in power management, automotive ICs, and industrial control solutions.
The TSM108 belongs to ST's high-voltage analog controller product line, engineered specifically for automotive battery charging and non-isolated DC/DC conversion where robustness, dual-loop regulation, and integration reduce bill-of-materials and board space.
FAQ
What is the maximum allowable input voltage transient for TSM108IDT?
The TSM108IDT supports 60 V transient input on the VCC pin for up to 400 ms, satisfying ISO 7637-2 Load Dump Pulse 5a requirements for 12 V automotive systems. This eliminates the need for external TVS diodes in most cigarette lighter adapter designs, provided the external MOSFET and diode also sustain ≥60 V.
Can TSM108IDT drive an N-channel MOSFET instead of a P-channel device?
No - the TSM108IDT gate driver is explicitly designed for high-side P-channel MOSFETs or PNP transistors. Its GD pin provides a totem-pole output referenced to VCC, sinking current to turn the P-MOSFET ON. Driving an N-MOSFET would require bootstrapping or isolated gate drive, which the IC does not support.
How is the current limit adjusted, and what is the tolerance of the sense voltage?
The current limit is set by an external sense resistor (Rsense) placed in series with the output positive line, where Ilim = 206 mV / Rsense. The Vsense reference has a total tolerance of ±25 mV (±12%) over -25°C to +85°C, contributing directly to current limit accuracy. For tighter regulation, use low-tempco resistors and consider layout symmetry for Kelvin sensing.
Does TSM108IDT support synchronous rectification?
No - the TSM108IDT is designed for asynchronous buck topologies using an external Schottky or ultrafast recovery diode. It lacks a second gate driver output or timing control for synchronous FETs. Its GD pin drives only the high-side P-MOSFET, and the freewheeling path relies on the external diode connected between output and ground.
TSM108IDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 9V ~ 32V
- Frequency - Switching:
- 100kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
TSM108IDT FAQ
1.How can I place an order for TSM108IDT through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM108IDT 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 TSM108IDT reliable?
The price and inventory of TSM108IDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM108IDT is usually 5 days.
3.What payment methods are accepted for TSM108IDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM108IDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM108IDT?
TSM108IDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM108IDT 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 TSM108IDT?
For technical support, including TSM108IDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM108IDT requirements.
6.How does Aetrix verify that TSM108IDT is sourced from the original manufacturer or authorized distributors?
All TSM108IDT 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 TSM108IDT meets industry standards.
7.What is the process for return or replacement of TSM108IDT?
All TSM108IDT units undergo pre-shipment inspection (PSI). If there is an issue with TSM108IDT, 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 TSM108IDT part is unused and in its original packaging.
Return procedure for TSM108IDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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