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STMicroelectronics PM6675TR
- Part No.:
- PM6675TR
- Manufacturer:
- STMicroelectronics
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
PM6675TR.pdf
- Description:
- IC REG DL BCK/LNR 33KHZ 24VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
PM6675TR from STMicroelectronics is a dual-output power management IC integrating a high-efficiency constant-on-time (COT) step-down controller and an independent 2A peak-sink/source LDO regulator in a single VFQFPN-24 package. It supports 4.5–28V input, delivers fixed 1.5V or adjustable 0.6–3.3V SMPS output with ±1% reference accuracy (1.237V), and provides ±1A/±2A selectable LDO current limiting - used in notebook CPU core voltage regulation and GPU VDDQ supply.
For engineers reviewing the PM6675TR datasheet, PM6675TR pinout, PM6675TR application, or PM6675TR equivalent, key selection considerations include its lossless RDS(ON) current sensing, 3ms internal soft-start, no-audible 33kHz pulse-skip mode, ceramic-capacitor compatibility, and independent soft-end discharge for both outputs.
Technical Context
The PM6675TR implements a pseudo-fixed-frequency COT architecture where on-time is inversely proportional to input voltage (via VOSC) and directly proportional to output voltage (via VSNS), enabling fast transient response without external compensation. Its embedded integrator loop compensates DC error from output ripple, supporting both electrolytic and ceramic output capacitors.
Two independent regulation paths operate concurrently: the SMPS section uses high/low-side gate drivers (HGATE/LGATE) with anti-cross-conduction logic and latched OVP/UVP, while the LDO section features dedicated Power-Good (LPG), remote sensing (LFB), and configurable ±1A/±2A current limit via LILIM pin - both sections support active soft-end discharge when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - enables direct connection to 5V, 12V, or 24V system rails without pre-regulation. |
| SMPS Reference Accuracy | 1.237V ±1% - ensures tight output regulation across temperature and line/load variations. |
| LDO Output Current Limit | Selectable ±1A or ±2Apk - allows matching to load transient requirements while minimizing thermal stress. |
| Switching Frequency Min | 33kHz (No-Audible mode) - eliminates audible noise in audio-sensitive applications like notebooks. |
| Soft-Start Duration | Internally fixed at 3ms - prevents inrush current during power-up without external timing components. |
| Current Sensing Method | Lossless RDS(ON) sensing on low-side MOSFET - eliminates sense resistor power loss and board space. |
| Output Discharge | Integrated 15–35Ω discharge resistance per rail - ensures safe, controlled voltage ramp-down during shutdown. |
Pinout & Package
Package: VFQFPN-24 4×4 mm with exposed thermal pad - optimized for high-power density and thermal performance in space-constrained computing applications.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| LGND | LDO power ground | Separate ground return for LDO section to minimize noise coupling into analog control circuitry. |
| LFB | LDO remote sense input | Enables precise load-point regulation by connecting directly to the load's feedback node. |
| NOSKIP | Mode selection (PWM/Pulse-Skip/No-Audible) | Determines light-load behavior: forced PWM, standard pulse-skip, or 33kHz-minimum frequency for audio immunity. |
| LPG | LDO Power-Good open-drain output | Signals valid LDO output (±10%) - used for sequencing or fault monitoring in multi-rail systems. |
| VSEL | SMPS output mode selector | High >4V selects fixed 1.5V; low <4V enables adjustable 0.6–3.3V output via external resistor divider. |
| CSNS | Current sense input | Connects to low-side MOSFET source to enable RDS(ON)-based current limiting without external shunt. |
| HGATE / LGATE | High-side / Low-side gate drivers | Integrated 2.0Ω/0.9Ω typical RDS(ON) drivers support efficient synchronous buck operation up to 28V input. |
| VSNS | SMPS remote sense & soft-end path | Provides accurate output voltage feedback and initiates controlled discharge during disable. |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Delivers sub-10µs load transient response without external loop compensation components. |
| No-Audible Pulse-Skip Mode | Guarantees minimum 33kHz switching frequency to eliminate coil whine in portable electronics. |
| Independent Soft-End Discharge | Active 15–35Ω discharge on both SMPS and LDO outputs ensures safe, sequenced power-down. |
| Dual Power-Good Signals | Separate open-drain SPG and LPG outputs enable independent monitoring and sequencing of each rail. |
| Ceramic Capacitor Support | Stable operation with ≥20µF MLCC output capacitance - reduces solution size and improves reliability vs. electrolytics. |
Applications
| Mobile CPU Core Supply | GPU Memory (VDDQ) Regulation |
|---|---|
|
Use Scenario: Providing tightly regulated 0.9V/1.2V core voltage to Intel/AMD mobile processors under dynamic load conditions. IC Role / Device Role / Timing Role: Dual-rail PMIC delivering synchronized, sequenced, and independently monitored SMPS + LDO outputs. Use Value: Fast COT transient response maintains voltage within ±3% during 10A/µs load steps, preventing processor throttling. |
Use Scenario: Generating clean, low-noise 1.5V VDDQ supply for GDDR6 memory on discrete graphics cards. IC Role / Device Role / Timing Role: SMPS supplies bulk power; LDO filters high-frequency switching noise before delivery to memory I/O rails. Use Value: No-Audible mode suppresses audible coil noise during gaming; ceramic output caps reduce ESR-induced jitter. |
| Notebook Platform Power | Embedded Computing SoC Rail |
|
Use Scenario: Consolidating multiple voltage rails (CPU core, SoC I/O, chipset) in thin-and-light notebook designs. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete controllers and linear regulators to reduce BOM count and PCB area. Use Value: Integrated soft-start and soft-end enable precise power sequencing across all rails without external timers. |
Use Scenario: Powering ARM-based industrial SoCs requiring stable 1.0V core and 1.8V I/O rails with minimal thermal footprint. IC Role / Device Role / Timing Role: SMPS powers high-current core domain; LDO supplies noise-sensitive I/O with ±2A sink/source capability. Use Value: Exposed-pad VFQFPN-24 package achieves 42°C/W θJA, enabling full 2A LDO operation at 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-rail power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6269CRZ-T | Single-channel COT controller with integrated 5V LDO; lacks independent LDO sink/source capability and no-audible mode. | Designed for legacy Pentium M platforms; no support for modern low-VOUT CPU cores below 1.0V. | Choose only if system requires 5V auxiliary LDO and does not need ±2A bidirectional current handling. |
| TPS51220ARUKR | Single-rail VR12-compatible controller with external LDO bias; no integrated LDO, higher quiescent current (3mA vs. 2mA). | Targeted at server DDR3 memory termination; lacks remote sensing (LFB) and independent soft-end discharge. | Select when DDR3 VTT compliance is required and LDO functionality is implemented externally. |
Compared with ISL6269CRZ-T and TPS51220ARUKR, the PM6675TR uniquely integrates bidirectional ±2A LDO regulation with no-audible switching and dual independent Power-Good signals - making it optimal for compact, noise-sensitive dual-rail notebook and GPU applications where space and acoustic performance are critical.
Availability
PM6675TR is available at Aetrix Electronics and suitable for notebook computers, graphic cards, and embedded computers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for PM6675TR 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, specializing in power management, microcontrollers, and automotive ICs with over 40 years of analog design heritage.
The PM6675TR belongs to ST's high-density power controller product line, engineered specifically for multi-rail, space-constrained computing platforms where integration, efficiency, and acoustic performance are prioritized over generic DC-DC conversion.
FAQ
What is the function of the NOSKIP pin on the PM6675TR?
The NOSKIP pin configures the light-load operating mode: tied to SGND for forced-PWM, pulled to AVCC for standard pulse-skip, or set to 1.0V for No-Audible mode (≥33kHz min frequency). This selection directly determines whether the SMPS operates silently or maximizes efficiency during idle periods - critical for fanless notebook designs.
Can the PM6675TR's LDO regulate below 0.6V?
No. The LDO output is adjustable from 0.6V to 3.3V using the VLREF (0.6V ±1%) internal reference and external resistor divider on LFB. The 0.6V lower bound is enforced by the precision bandgap reference; attempting sub-0.6V operation violates the specified electrical characteristics and risks unstable regulation.
How does the PM6675TR achieve current limiting without a sense resistor?
It uses lossless RDS(ON) current sensing: the CSNS pin monitors voltage drop across the low-side MOSFET's intrinsic on-resistance during conduction. This eliminates external shunt resistors, reducing power loss and PCB area while maintaining ±10% current limit accuracy across temperature.
Is the VFQFPN-24 package RoHS-compliant and lead-free?
Yes. The PM6675TR VFQFPN-24 package meets RoHS Directive 2011/65/EU and is lead-free, halogen-free, and compliant with JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) - verified per STMicroelectronics' official packaging documentation and material declarations.
PM6675TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- Down to 33kHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- 0.6V ~ 3.3V, 2A
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.5V ~ 28V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VFQFPN (4x4)
PM6675TR FAQ
1.How can I place an order for PM6675TR through Aetrix?
Please submit a Request for Quotation (RFQ) for PM6675TR 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 PM6675TR reliable?
The price and inventory of PM6675TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PM6675TR is usually 5 days.
3.What payment methods are accepted for PM6675TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PM6675TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PM6675TR?
PM6675TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PM6675TR 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 PM6675TR?
For technical support, including PM6675TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PM6675TR requirements.
6.How does Aetrix verify that PM6675TR is sourced from the original manufacturer or authorized distributors?
All PM6675TR 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 PM6675TR meets industry standards.
7.What is the process for return or replacement of PM6675TR?
All PM6675TR units undergo pre-shipment inspection (PSI). If there is an issue with PM6675TR, 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 PM6675TR part is unused and in its original packaging.
Return procedure for PM6675TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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