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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Gate Drivers

STMicroelectronics STSR2PMCD-TR

Name: STSR2PMCD-TR
Brand: STMicroelectronics
SKU: STSR2PMCD-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STSR2PMCD-TR

Manufacturer:: STMicroelectronics

Category:: Gate Drivers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: STSR2PMCD-TR.pdf

Description:: IC GATE DRVR LOW-SIDE 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STSR2PMCD-TR from STMicroelectronics is a smart synchronous rectifier driver IC designed for secondary-side gate control in medium-power forward converters. It delivers complementary high-current outputs (source −2 A, sink 3.5 A), operates from 4.5–5.5 V supply, supports 20–750 kHz switching, and features programmable turn-off anticipation timing for OUTGATE2-enabling robust shoot-through prevention in low-voltage, high-efficiency DC/DC applications.

For engineers reviewing the STSR2PMCD-TR datasheet, STSR2PMCD-TR pinout, STSR2PMCD-TR application, or STSR2PMCD-TR equivalent, key selection criteria include its dual-output timing independence from magnetic reset technique, INHIBIT-enabled discontinuous conduction mode support, UVLO-protected startup, and SO-8 package compatibility with high-density power layouts.

Technical Context

The STSR2PMCD-TR implements cycle-by-cycle dead-time control using a synchronized 15 MHz internal oscillator and smart clock revelation logic. It generates two complementary gate drive signals (OUTGATE1, OUTGATE2) with fixed 75 ns turn-off anticipation on OUTGATE1 and externally adjustable anticipation (75/150/225 ns) on OUTGATE2 via SETANT2 voltage partitioning.

Its operation is decoupled from forward transformer demagnetization method, eliminating false triggering under light load. The INHIBIT function enables precise freewheeling MOSFET shutdown when reverse current is detected, supporting true discontinuous conduction mode while preventing output sinking-critical for 3.3 V/5 V output forward converters.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - ensures compatibility with logic-level MOSFETs and stable UVLO behavior (V_CCON = 4 V, V_CCOFF = 3.6 V).
Peak Output Current	Source −2 A / Sink 3.5 A - drives low-R_DS(on) SR MOSFETs with minimal external buffering in high-current secondary paths.
Operating Frequency	20 kHz to 750 kHz - supports wide-range forward converter designs including telecom and industrial SMPS.
Turn-off Anticipation	OUTGATE1: fixed 75 ns; OUTGATE2: selectable 75/150/225 ns - prevents shoot-through without relying on transformer reset waveform.
INHIBIT Threshold	−30 mV to −25 mV - enables precise zero-current detection for freewheeling MOSFET disable during DCM transition.
Rise/Fall Time	t_R = 40 ns, t_F = 30 ns (C_LOAD = 5 nF) - ensures fast edge control for <100 ns dead-time margin at 500 kHz.
Duty Cycle Limit	Shut-down below 13% duty cycle (STSR2P); STSR2PM variant operates down to 200 ns pulse width - distinguishes PM version for ultra-low-duty applications.

Pinout & Package

STSR2PMCD-TR is housed in a standard SO-8 package (5.0 × 4.0 mm, 1.27 mm pitch) with thermally enhanced layout separation between SGLGND (control reference) and PWRGND (high-current return).

Pin/Terminal	Circuit Role	Design Meaning
1 - OUTGATE1	Gate drive output for main rectifier MOSFET	Fixed 75 ns turn-off anticipation triggered on CK falling edge; drives primary synchronous rectifier in forward secondary.
2 - VCC	Power supply input	4.5–5.5 V rail with integrated UVLO (start at 4 V, shut off at 3.6 V) for reliable startup and brownout protection.
3 - SETANT2	Anticipation timing select input	Voltage divider from VCC sets OUTGATE2 turn-off anticipation to 75/150/225 ns - enables tuning for transformer leakage and MOSFET gate charge.
4 - CK	Clock synchronization input	Accepts TTL-compatible clock signal (2.6–2.8 V threshold); internal 15 MHz oscillator synchronizes timing without dependency on reset method.
5 - INHIBIT	Freewheeling MOSFET enable/disable control	−25 mV threshold disables OUTGATE2 when reverse current flows - enables true DCM and prevents output sinking.
6 - SGLGND	Signal ground reference	Isolated from PWRGND to prevent noise coupling into timing and comparator circuits - critical for jitter-free operation.
7 - OUTGATE2	Gate drive output for freewheeling MOSFET	Programmable turn-off anticipation on CK rising edge; disabled by INHIBIT to terminate freewheeling phase cleanly.
8 - PWRGND	Power ground return	Carries full peak output currents (−2 A / +3.5 A); must be routed separately from SGLGND to avoid ground bounce.

Key Features

Feature	Design Value
Smart Turn-off Anticipation	Fixed 75 ns on OUTGATE1 + user-selectable 75/150/225 ns on OUTGATE2 eliminates need for external timing components and ensures shoot-through immunity across line/load.
INHIBIT-Controlled DCM	−25 mV threshold on Pin 5 allows precise zero-current crossing detection to disable freewheeling MOSFET - enabling efficient light-load operation without reverse conduction.
Reset-Independent Operation	Internal clock revelation logic decouples timing from transformer demagnetization technique - removes sensitivity to snubber design, winding parasitics, and core saturation effects.
UVLO with Hysteresis	V_CCON = 4.0 V / V_CCOFF = 3.6 V hysteresis prevents oscillatory startup during marginal supply conditions - essential for 5 V rail stability in distributed power systems.
Separated Ground Planes	Dedicated SGLGND (Pin 6) and PWRGND (Pin 8) minimize noise coupling between control logic and high di/dt gate drive paths - improves timing accuracy and EMI performance.

Applications

Telecom DC/DC Converters

Industrial Forward SMPS

Use Scenario: 48 V input, 3.3 V/20 A output forward converter in base station power supply.

IC Role / Device Role / Timing Role: Dual-gate driver for synchronous rectifiers on transformer secondary; provides independent turn-off timing to eliminate shoot-through during high-frequency (300 kHz) operation.

Use Value: Enables >92% efficiency at full load by replacing Schottky diodes with low-R_DS(on) MOSFETs while maintaining timing safety under variable line and load transients.

Use Scenario: 36–72 V input, 5 V/15 A forward converter powering PLC I/O modules.

IC Role / Device Role / Timing Role: Controls main and freewheeling SR MOSFETs with INHIBIT-driven DCM entry at light load to reduce standby losses.

Use Value: Reduces no-load power consumption by 45% versus fixed-frequency diode rectification, meeting IEC 62301 standby requirements.

Server VRM Auxiliary Rails

Medical Power Supplies

Use Scenario: 12 V input, 3.3 V/10 A forward-derived auxiliary rail for FPGA core logic.

IC Role / Device Role / Timing Role: Drives dual N-channel SRs with programmable OUTGATE2 anticipation to match gate charge of 3.5 mΩ MOSFETs.

Use Value: Achieves <15 mV output ripple at 500 kHz switching by minimizing dead-time-induced body-diode conduction.

Use Scenario: Isolated 24 V input, 5 V/6 A forward converter in patient-connected diagnostic equipment.

IC Role / Device Role / Timing Role: Provides galvanically isolated secondary-side gate control with separated SGLGND/PWRGND to meet IEC 60601 creepage/clearance and EMI limits.

Use Value: Eliminates radiated emissions from gate ringing through clean edge control and ground isolation - passes CISPR 11 Class B without added filtering.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous rectifier driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC24612-2QDRQ1	Automotive-grade, integrated V_DS sensing; no external clock input required; fixed 100 ns dead time.	Self-sensing topology eliminates need for CK signal but requires direct drain connection - incompatible with transformer-coupled forward topologies.	Select when designing automotive forward converters where CK signal routing is impractical and drain sensing is feasible.
IR11672PbF	Single-output driver with adaptive timing; no INHIBIT pin; relies on transformer reset detection for DCM.	Lacks dual-output complementarity and programmable anticipation - cannot replace STSR2PMCD-TR in designs requiring independent OUTGATE1/OUTGATE2 control.	Use only in cost-sensitive single-MOSFET forward variants where freewheeling MOSFET is omitted or controlled externally.

Compared with UCC24612-2QDRQ1 and IR11672PbF, STSR2PMCD-TR uniquely supports clock-synchronized dual-output timing with external anticipation tuning and INHIBIT-based DCM - making it the only option for high-reliability, transformer-coupled forward converters demanding precise secondary-side timing independence.

Availability

STSR2PMCD-TR is available at Aetrix Electronics and suitable for telecom DC/DC converters, industrial forward SMPS, and medical power supplies requiring stable component supply, long-term lifecycle assurance, and SO-8 tape-and-reel delivery for automated assembly.

Supply support for STSR2PMCD-TR 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, analog, microcontrollers, and automotive ICs with over 45 years of industrial reliability heritage.

STSR2P/STSR2PM belongs to ST's high-efficiency power conversion driver product line, engineered specifically for synchronous rectification in forward and active-clamp forward topologies - targeting >90% efficiency at sub-5 V outputs with minimal external components.

FAQ

What is the key functional difference between STSR2P and STSR2PM?

The STSR2PM variant extends minimum operating duty cycle capability: STSR2P shuts down outputs below 13% duty cycle, while STSR2PM remains operational down to 200 ns pulse width. This makes STSR2PM suitable for ultra-low-duty applications such as high-input-voltage forward converters with large turns ratios, where STSR2P would disable prematurely.

How does the INHIBIT pin enable discontinuous conduction mode?

The INHIBIT pin uses a −25 mV comparator threshold to detect reverse current flow through the freewheeling MOSFET. When voltage at Pin 5 exceeds this threshold (i.e., becomes less negative), OUTGATE2 is forced high for a fixed 250 ns minimum conduction time, then disabled - cleanly terminating freewheeling before reverse current builds, enabling true DCM without external controllers.

Why are SGLGND and PWRGND physically separated pins?

SGLGND (Pin 6) serves as the reference for all timing, comparators, and logic circuits, while PWRGND (Pin 8) carries high di/dt gate drive return currents. Separation prevents ground bounce from modulating clock thresholds or INHIBIT detection, ensuring consistent 75 ns anticipation timing and −25 mV threshold accuracy across load transients and PCB layout variations.

Can STSR2PMCD-TR drive both N-channel MOSFETs on the secondary side?

Yes - STSR2PMCD-TR is designed exclusively for dual N-channel synchronous rectification. OUTGATE1 and OUTGATE2 are high-side referenced gate drivers with rail-to-rail swing (0.16 V low, 4.85 V high at 200 mA), capable of fully enhancing logic-level MOSFETs without external level shifters or bootstrap networks.

STSR2PMCD-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Driven Configuration:: Low-Side

Channel Type:: Synchronous

Number of Drivers:: 2

Gate Type:: N-Channel MOSFET

Voltage - Supply:: 4.5V ~ 5.5V

Logic Voltage - VIL, VIH:: -

Current - Peak Output (Source, Sink):: 2A, 3.5A

Input Type:: Non-Inverting

High Side Voltage - Max (Bootstrap):: -

Rise / Fall Time (Typ):: 40ns, 30ns

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

STSR2PMCD-TR FAQ

1.How can I place an order for STSR2PMCD-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for STSR2PMCD-TR 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 STSR2PMCD-TR reliable?

The price and inventory of STSR2PMCD-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STSR2PMCD-TR is usually 5 days.

3.What payment methods are accepted for STSR2PMCD-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STSR2PMCD-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STSR2PMCD-TR?

STSR2PMCD-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STSR2PMCD-TR 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 STSR2PMCD-TR?

For technical support, including STSR2PMCD-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STSR2PMCD-TR requirements.

6.How does Aetrix verify that STSR2PMCD-TR is sourced from the original manufacturer or authorized distributors?

All STSR2PMCD-TR 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 STSR2PMCD-TR meets industry standards.

7.What is the process for return or replacement of STSR2PMCD-TR?

All STSR2PMCD-TR units undergo pre-shipment inspection (PSI). If there is an issue with STSR2PMCD-TR, 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 STSR2PMCD-TR part is unused and in its original packaging.

Return procedure for STSR2PMCD-TR:

1.Submit a request within 90 days.

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

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