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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

STMicroelectronics PM6680TR

Name: PM6680TR
Brand: STMicroelectronics
SKU: PM6680TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PM6680TR

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 32-VFQFN Exposed Pad

Datasheet:: PM6680TR.pdf

Description:: IC REG CTRL NOTEBK 2OUT 32VFQFPN

Quantity:: RFQ Add To RFQ list

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Inventory:3,899

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Product details

Overview

PM6680TR from STMicroelectronics is a dual synchronous step-down controller IC for notebook and tablet PC power systems, featuring lossless R_DS(on) current sensing, adjustable outputs (0.9–5.5 V / 0.9–3.3 V), 6–28 V input range, and integrated 5 V/100 mA LDO regulator. It delivers high efficiency across load ranges using constant-on-time PWM with voltage feed-forward and output ripple compensation.

For engineers reviewing the PM6680TR datasheet, PM6680TR pinout, PM6680TR application, or PM6680TR equivalent, key selection criteria include dual-channel independent enable/control, selectable pulse-skip/no-audible-skip modes, negative current limit protection, soft-start/soft-discharge timing, and VFQFPN-32 package thermal performance in space-constrained mobile power designs.

Technical Context

The PM6680TR employs a constant-on-time (COT) PWM architecture with embedded voltage feed-forward to maintain near-constant switching frequency under line/load transients while enabling fast response. Its integrator-based loop compensates DC error caused by output ripple, improving regulation accuracy without external compensation components.

It supports three selectable switching frequencies via FSEL pin, includes independent power-good signals (PGOOD1/PGOOD2) with ±10% tolerance, and implements latched overvoltage/undervoltage protection plus thermal shutdown. The device uses low-side MOSFET R_DS(on) for lossless current sensing and provides negative current limiting on both PHASE1/PHASE2 nodes.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	6 V to 28 V - supports 3–4-cell Li+ battery input and wide-input adapter operation.
OUT1 Adjustable Range	0.9 V to 5.5 V - enables core logic, memory, or I/O rail generation with external resistor divider.
OUT2 Adjustable Range	0.9 V to 3.3 V - optimized for peripheral or auxiliary rails requiring lower voltage compliance.
LDO5 Output	5 V ±2%, 100 mA peak - powers gate drivers and external circuitry; bypassable via V5SW pin.
Reference Voltage	1.237 V ±1% - high-accuracy internal reference for precise feedback regulation.
Quiescent Power	4 mW max - minimizes standby current draw in battery-powered suspend states.
Soft-Start Time	Internally fixed at 2 ms - ensures controlled ramp-up of both outputs to prevent inrush stress.
Minimum Pulse-Skip Freq	33 kHz selectable - avoids audible noise in light-load conditions without compromising efficiency.

Pinout & Package

PM6680TR is housed in a VFQFPN-32 5 mm × 5 mm exposed-pad package with 0.5 mm pitch, optimized for thermal dissipation in compact mobile power stages. The exposed pad must be soldered to PCB ground plane for optimal thermal and electrical performance.

Pin/Terminal	Circuit Role	Design Meaning
FB1 / FB2	Feedback input	Resistive divider node for OUT1/OUT2 regulation; sets output voltage with 1.237 V reference.
HGATE1 / HGATE2	High-side gate driver output	Floating outputs driving external N-channel MOSFET gates; require bootstrap capacitors (BOOT1/BOOT2).
LGATE1 / LGATE2	Low-side gate driver output	Ground-referenced drivers for synchronous rectifiers; powered by LDO5 or external 5 V.
CSENSE1 / CSENSE2	Positive current sense input	Connects to drain of low-side MOSFET to implement lossless R_DS(on)-based current limiting.
PHASE1 / PHASE2	Switch node	Drain connection point for high-side MOSFETs; also serves as negative current sense return path.
PGOOD1 / PGOOD2	Power-good open-drain output	Asserts low when respective output deviates >±10%; requires external pull-up for system sequencing.
EN1 / EN2	Enable control input	Logic-level inputs (2.4 V high / 0.8 V low) for independent channel enable/disable and standby entry.
SKIP	Pulse-skip mode selector	Configures PWM, pulse-skip, or no-audible-skip (≥33 kHz) based on connection to LDO5/GND/VREF.
VREF	1.237 V reference output	Stable, low-noise reference; must be bypassed with 100 nF capacitor to SGND for regulation integrity.
LDO5	5 V linear regulator output	Supplies gate drivers and external loads; can be bypassed via V5SW pin when external 5 V is available.

Key Features

Feature	Design Value
Lossless current sensing	Uses low-side MOSFET R_DS(on) - eliminates sense resistor losses and improves efficiency at high currents.
Output ripple compensation	Embedded integrator loop - corrects DC regulation error induced by output capacitor ESR/ESL ripple.
No-audible pulse skip mode	Selectable minimum 33 kHz frequency - prevents coil whine during light-load operation without sacrificing efficiency.
Independent power-good signaling	Two open-drain PGOOD pins - enables precise power sequencing and fault isolation for dual-rail systems.
Soft output discharge	Active discharge path on disable - prevents floating output voltages and ensures safe rail collapse during shutdown.
Negative current limit	Detects reverse current at PHASE pins - protects against inductive kickback and regenerative energy during transient events.

Applications

Mobile CPU Core Supply

Notebook I/O Rail Generation

Use Scenario: Regulating 1.05 V or 1.5 V core voltage for Intel/AMD mobile processors under dynamic load changes.

IC Role / Device Role / Timing Role: Dual-channel step-down controller providing fast transient response via constant-on-time architecture and ripple-compensated loop stability.

Use Value: Maintains ±1% output regulation during 10 A/µs load steps while minimizing output capacitance through active ripple compensation.

Use Scenario: Generating 3.3 V auxiliary rail for USB, PCIe, or display interface circuitry in ultrabook platforms.

IC Role / Device Role / Timing Role: Secondary buck controller with independent enable (EN2) and power-good (PGOOD2) for sequenced power-up.

Use Value: Enables clean, isolated startup of peripheral subsystems without interference from CPU rail transitions.

Tablet PC Battery Management

Li+ Multi-Rail Power System

Use Scenario: Powering SoC, DDR, and display subsystems from 3–4 cell Li+ battery (9–16.8 V nominal).

IC Role / Device Role / Timing Role: Primary dual-output controller supporting wide VIN range and low-quiescent 4 mW standby operation.

Use Value: Extends battery runtime in suspend mode while maintaining fast wake-up capability via 2 ms soft-start.

Use Scenario: Consolidating multiple DC/DC rails in space-constrained portable devices using single-controller solution.

IC Role / Device Role / Timing Role: Dual-buck controller with shared LDO5 and independent FSEL/SKIP controls for flexible frequency and mode tuning.

Use Value: Reduces BOM count and PCB area versus discrete controllers while preserving design margin via selectable protections.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-step-down controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL95831IRZ-T	Single-chip dual-phase controller with integrated MOSFET drivers; lacks LDO5 and VREF output.	Requires external 5 V bias; no built-in always-on rail - unsuitable for systems needing dedicated 5 V supply.	Prefer PM6680TR when LDO5-powered gate drive or reference stability is required.
TPS51220ARUKR	Supports only 0.6–3.5 V outputs; no 5 V LDO or 1.237 V reference; uses external compensation.	Cannot generate >3.5 V rails or replace PM6680TR's 5 V always-on function - limited to low-voltage SoC domains.	Choose PM6680TR for designs requiring >3.3 V output or integrated reference/LDO functionality.

Compared with ISL95831IRZ-T and TPS51220ARUKR, PM6680TR uniquely integrates a 5 V/100 mA LDO, precision 1.237 V reference, and lossless R_DS(on) sensing - enabling simpler, more robust multi-rail power architectures in battery-powered notebooks and tablets.

Availability

PM6680TR is available at Aetrix Electronics and suitable for notebook computers, tablet PCs, and 3–4 cell Li+ battery-powered devices requiring stable component supply, long-term lifecycle support, and consistent thermal performance in VFQFPN-32 packaging.

Supply support for PM6680TR 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 specializing in power management, microcontrollers, and analog ICs, with broad automotive, industrial, and consumer product portfolios.

The PM6680TR belongs to ST's high-efficiency notebook power controller family, designed specifically for space-constrained, battery-sensitive mobile computing platforms requiring dual-rail flexibility and ultra-low quiescent power.

FAQ

What is the purpose of the V5SW pin?

The V5SW pin controls the internal 5 V LDO regulator (LDO5). When tied to an external 5 V source >4.9 V, it disables the LDO and connects LDO5 directly to that source via a 3 Ω max switch. When grounded, the LDO remains active. This allows seamless integration with external 5 V supplies while retaining gate driver bias capability.

How does the PM6680TR achieve lossless current sensing?

It uses the R_DS(on) of the low-side MOSFET as a current-sense element. The CSENSE1/CSENSE2 pins monitor the voltage drop across the MOSFET's channel during conduction, eliminating the need for discrete sense resistors and associated power loss - particularly beneficial at high output currents.

Can the two buck channels operate at different switching frequencies?

Yes. The FSEL pin selects one of three preset frequencies (e.g., 300 kHz, 500 kHz, 750 kHz), but both channels share the same selected value. Independent frequency control is not supported; however, each channel has separate enable (EN1/EN2), feedback (FB1/FB2), and power-good (PGOOD1/PGOOD2) signals for autonomous operation.

What protection features are latched versus auto-recover?

Overvoltage (OVP) and undervoltage (UVP) protections are latched - requiring SHDN pin toggle or power cycle to reset. Thermal shutdown and current limit are auto-recovering: operation resumes once fault condition clears. Soft-start and soft-discharge functions activate automatically on enable/disable transitions to prevent stress.

PM6680TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: Controller, Notebook Power System

Voltage - Input:: 6V ~ 28V

Number of Outputs:: 2

Voltage - Output:: 0.9V ~ 5.5V

Operating Temperature:: 0°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-VFQFPN (5x5)

PM6680TR FAQ

1.How can I place an order for PM6680TR through Aetrix?

Please submit a Request for Quotation (RFQ) for PM6680TR 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 PM6680TR reliable?

The price and inventory of PM6680TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PM6680TR is usually 5 days.

3.What payment methods are accepted for PM6680TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PM6680TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PM6680TR?

PM6680TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PM6680TR 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 PM6680TR?

For technical support, including PM6680TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PM6680TR requirements.

6.How does Aetrix verify that PM6680TR is sourced from the original manufacturer or authorized distributors?

All PM6680TR 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 PM6680TR meets industry standards.

7.What is the process for return or replacement of PM6680TR?

All PM6680TR units undergo pre-shipment inspection (PSI). If there is an issue with PM6680TR, 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 PM6680TR part is unused and in its original packaging.

Return procedure for PM6680TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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