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STMicroelectronics TSM108ID
- Part No.:
- TSM108ID
- Manufacturer:
- STMicroelectronics
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TSM108ID.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:782
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Product details
Overview
TSM108ID 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 automotive 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 100 kHz adjustable switching frequency via external capacitor.
For engineers reviewing the TSM108ID datasheet, TSM108ID pinout, TSM108ID application, or TSM108ID equivalent, key selection considerations include its 14-pin SO package, dual error amplifiers with independent compensation, 95% max duty cycle, 150 µA standby current, and gate driver optimized for PMOS with 40 mA sink / 80 mA source capability.
Technical Context
The TSM108ID implements a dual-loop control architecture: one voltage error amplifier (gain = 95 dB, reference = 2.52 V) compares a resistor-divided output voltage to VREF, while a second current error amplifier (gain = 105 dB, reference = 206 mV) monitors voltage drop across an external sense resistor. Their outputs are diode-ORed to generate a "max-of" signal that directly modulates the PWM comparator's duty cycle.
Its oscillator generates a sawtooth waveform set by an external capacitor on OSC pin (70–130 kHz range), and the totem-pole gate driver features integrated 12 V clamping, asymmetric turn-on/turn-off drive strength (15–40 mA sink vs. 30–80 mA source), and thermal shutdown protection at 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Max Rating | 60 V - meets ISO 7637-2 Load Dump requirements for 12 V automotive systems |
| VREF Accuracy | 2.52 V ±70 mV (−25°C to +85°C) - sets regulated output voltage precision in CV mode |
| VSENSE Accuracy | 206 mV ±25 mV (−25°C to +85°C) - defines current limit accuracy in CC mode |
| FOSC Range | 70–130 kHz - adjustable via external capacitor; typical 100 kHz balances ripple and choke size |
| Max Duty Cycle | 95% - prevents linear-mode operation of external PMOS during high-input/low-output conditions |
| ISTBY | 150 µA - enables ultra-low-power inactive state without compromising safety lockout functions |
| UVLO Threshold | 8–9 V with 200 mV hysteresis - disables output before VCC drops below safe gate-drive level |
| OVLO Threshold | 32–35 V with 400 mV hysteresis - shuts down system before overvoltage damages downstream components |
Pinout & Package
Package: SO-14 (Small Outline, 14-pin 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; withstands 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 quiescent paths |
| UV | UVLO sense input | Programmable under-voltage detection node; internal 184 kΩ/76.5 kΩ divider sets default 8 V threshold |
| OV | OVLO sense input | Programmable over-voltage detection node; internal 275 kΩ/23.2 kΩ divider sets default 32 V threshold |
| G | Internal ground tie | No external connection; internally bonded to GND |
| OSC | Oscillator timing | Connect external capacitor to GND to set switching frequency (e.g., 220 pF → 100 kHz) |
| VCOMP | Voltage loop compensation | Output of voltage error amplifier; connect RC network (e.g., 22 nF + 22 kΩ) to GND for stability |
| ICOMP | Current loop compensation | Output of current error amplifier; same compensation topology as VCOMP |
| VREF | Precision reference output | 2.52 V ±70 mV source; used for feedback divider bias and external circuitry referencing |
| VCTRL | Voltage feedback input | Inverting input of voltage error amp; connects to mid-point of output voltage divider |
| ICTRL | Current feedback input | Inverting input of current error amp; connects to high-side of current sense resistor |
| VS | Sense resistor return | Non-inverting input of current error amp; connects to low-side (choke side) of sense resistor |
| GD | Gate driver output | Totem-pole stage driving external P-channel MOSFET gate; includes 12 V clamp |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent control loops | Separate voltage and current error amplifiers with dedicated compensation pins (VCOMP/ICOMP) enable simultaneous CV/CC regulation without interaction |
| Adjustable protection thresholds | UV and OV pins accept external resistive dividers to precisely tailor lockout points beyond factory defaults (e.g., UV from 8 V to 6 V or 12 V) |
| Integrated gate driver with clamp | 12 V zener-like clamping on GD pin prevents overdriving PMOS gate oxide, eliminating need for external Zener diode |
| Current foldback protection | −6 mV offset on current amplifier inputs automatically reduces charge current during low-battery or short-circuit conditions |
| BCD process ruggedness | Manufactured in ST's BCD (Bipolar-CMOS-DMOS) technology enabling 60 V tolerance, high ESD immunity, and automotive-grade reliability |
| Asymmetric drive strength | Higher source current (80 mA) than sink current (40 mA) ensures faster PMOS turn-off, reducing shoot-through risk during switching transitions |
Applications
| Automotive Cigarette Lighter Adapters | USB-C Power Delivery Post-Regulators |
|---|---|
|
Use Scenario: 12 V car battery powering 5 V/3 A USB charging port with overvoltage and thermal protection. IC Role / Device Role / Timing Role: Primary PWM controller managing buck conversion, CV/CC regulation, and load dump survival. Use Value: Sustains 60 V transients per ISO 7637-2, eliminates need for upstream TVS, and enables single-stage 12 V→5 V conversion with <1% voltage drift. |
Use Scenario: Secondary regulation stage after a wide-input DC/DC converter, delivering stable 9 V/2 A for fast-charging smartphones. IC Role / Device Role / Timing Role: Precision post-regulator enforcing tight CV/CC compliance required by USB PD 3.0 specifications. Use Value: 2.52 V ±70 mV VREF and 206 mV ±25 mV Vsense ensure ±1% output voltage and ±3% current limit accuracy across temperature. |
| Industrial 24 V Battery Chargers | Medical Portable Device Power Supplies |
|
Use Scenario: Charging sealed lead-acid batteries in backup power systems with programmable OVP/UVP and temperature-compensated termination. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger controller with adjustable end-of-charge cutoff and fault latching. Use Value: UVLO/OVLO pins allow custom voltage thresholds (e.g., 21 V UVLO, 29 V OVLO) to match battery chemistry and prevent overcharge. |
Use Scenario: Low-noise, low-quiescent-power DC/DC supply for portable ultrasound or glucose monitors requiring clean 3.3 V rails. IC Role / Device Role / Timing Role: Standby-enabled regulator minimizing idle power draw while retaining immediate wake-up capability. Use Value: 150 µA standby current extends battery life >2× versus standard controllers; GD clamp ensures gate reliability in long-term medical use. |
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 shunt amplifier and separate OVP circuit | Lacks native CC regulation; suitable only for CV-only SMPS where current limiting is secondary | Choose when cost sensitivity outweighs need for precision CC control and automotive transient robustness |
| LM5001MM/NOPB | Higher VCC rating (100 V), but uses N-channel MOSFET drive (requires bootstrap), no built-in UVLO/OVLO programming pins | Requires additional external components for protection and cannot directly replace TSM108ID's PMOS drive architecture | Prefer for higher-input industrial supplies (>60 V) where bootstrap complexity is acceptable and CC regulation is handled externally |
Compared with UC3843BD1R2G and LM5001MM/NOPB, the TSM108ID uniquely integrates dual-loop CV/CC control, programmable protection thresholds, and PMOS-specific gate drive in a single SO-14 package-reducing BOM count by ≥4 passive components and eliminating design iterations for automotive-grade reliability.
Availability
TSM108ID is available at Aetrix Electronics and suitable for automotive accessory designs, battery charger modules, and industrial DC/DC converters requiring stable component supply, extended temperature operation (−40°C to +125°C), and ISO 7637-2 compliance.
Supply support for TSM108ID 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 automotive, industrial, and power management ICs with vertical manufacturing and AEC-Q100 qualification capabilities.
The TSM108ID belongs to ST's automotive-grade power controller product line, engineered specifically for robust, low-component-count DC/DC solutions in 12 V vehicle electrical systems and battery-powered portable equipment.
FAQ
What is the maximum allowable input voltage for continuous operation?
The TSM108ID supports continuous operation up to 36 V on VCC, with transient tolerance to 60 V for ≤400 ms per ISO 7637-2 Pulse 5a. This allows direct connection to automotive batteries without pre-regulation, provided external OVLO is configured to disable the controller before reaching destructive levels.
Can the TSM108ID drive an N-channel MOSFET instead of a P-channel device?
No-the TSM108ID's gate driver is explicitly designed for high-side P-channel MOSFETs or PNP transistors, with a totem-pole output referenced to VCC. Driving an N-channel MOSFET would require bootstrapping or level-shifting circuitry not supported by the IC's architecture or pinout.
How does the current foldback function operate during short-circuit conditions?
A fixed −6 mV offset is applied to the current amplifier's inputs, causing the effective current threshold to decrease linearly as output voltage drops. During short-circuit, this reduces IOUT to ~50% of nominal limit, preventing thermal runaway while maintaining regulation integrity and enabling safe auto-recovery when fault clears.
Is external compensation mandatory for stable operation?
Yes-both voltage and current loops require external RC networks between VCOMP/VREF and ICOMP/GND. ST recommends 22 nF in series with 22 kΩ for standard 100 kHz operation; omitting compensation causes oscillation or sluggish response, especially under dynamic load steps or wide input voltage ranges.
TSM108ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
TSM108ID FAQ
1.How can I place an order for TSM108ID through Aetrix?
Please submit a Request for Quotation (RFQ) for TSM108ID 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 TSM108ID reliable?
The price and inventory of TSM108ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM108ID is usually 5 days.
3.What payment methods are accepted for TSM108ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM108ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TSM108ID?
TSM108ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TSM108ID 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 TSM108ID?
For technical support, including TSM108ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM108ID requirements.
6.How does Aetrix verify that TSM108ID is sourced from the original manufacturer or authorized distributors?
All TSM108ID 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 TSM108ID meets industry standards.
7.What is the process for return or replacement of TSM108ID?
All TSM108ID units undergo pre-shipment inspection (PSI). If there is an issue with TSM108ID, 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 TSM108ID part is unused and in its original packaging.
Return procedure for TSM108ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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