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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

STMicroelectronics L6615D013TR

Name: L6615D013TR
Brand: STMicroelectronics
SKU: L6615D013TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L6615D013TR

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

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

Datasheet:: L6615D013TR.pdf

Description:: IC CTRLR HIGH/LOW SIDE 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L6615D013TR from STMicroelectronics is a high/low-side load share controller IC designed for paralleling DC-DC converters in distributed power systems. It supports up to 20 modules in (N+1) redundant architectures, features 2.7–22 V V_CC operation, full differential current sensing with ≤2 mV input offset, and 32 kΩ share sense amplifier input impedance. It enables thermal stress equalization and graceful failure tolerance in server-grade SMPS.

For engineers reviewing the L6615D013TR datasheet, L6615D013TR pinout, L6615D013TR application, or L6615D013TR equivalent, key selection criteria include share bus voltage clamping at V_CC − 2.2 V, ±1% mirror accuracy for high/low-side sensing, hysteretic UVLO with 100 mV hysteresis, and compatibility with remote output voltage sensing across wide common-mode ranges.

Technical Context

The L6615 implements a master-slave current sharing architecture using a single-wire share bus. Its current sense amplifier auto-switches between high-side and low-side configurations based on a 1.6 V threshold at CS+, with 0.16 V switchover hysteresis to prevent oscillation during transition.

The share drive amplifier (SDA) drives the bus with unity gain (V_CGA ≈ V_SH) in master mode, while slave units use internal diode isolation. The error amplifier features 4 ms transconductance and a built-in 40 mV offset to ensure low output in master configuration, enabling precise current matching across paralleled supplies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 22 V - supports wide-input industrial and server power rails without external regulators.
Current Sense Offset	±2 mV max - ensures accurate load current measurement down to sub-100 mV sense voltages.
Share Bus Input Impedance	32 kΩ typ. - minimizes loading on shared bus, enabling stable operation with ≥20 paralleled modules.
Hysteretic UVLO	2.45 V turn-on / 2.35 V turn-off - prevents supply chatter during brownout conditions.
Mirror Accuracy	±1% typ., ±5% max - guarantees tight current matching between modules under varying thermal and layout conditions.
Slew Rate	0.8–4 V/μs - supports fast transient response in dynamic load-sharing scenarios.
Input Common-Mode Range	0 V to V_CC - enables direct high-side sensing on outputs up to 22 V without level-shifting.

Pinout & Package

Package: SO8 (Small Outline, 8-pin, 150 mil width), RoHS-compliant, surface-mount.

Pin/Terminal	Circuit Role	Design Meaning
1 GND	Ground reference	Primary return path for all internal amplifiers and bias circuits; must be low-impedance connection to system ground plane.
2 CS−	Current sense negative input	Connects via RG2 resistor to low-side of sense resistor; forms differential pair with CS+ for offset-canceled sensing.
3 CS+	Current sense positive input	Determines high/low-side mode via 1.6 V threshold; connects via RG1 to high-side of sense resistor or load return.
4 ADJ	Adjust amplifier output	Open-collector current sink that trims slave output voltage by diverting feedback current proportional to current mismatch.
5 COMP	Error amplifier output	Transconductance output (3–5 ms) driving compensation network; clamped to 1.5 V max for stability.
6 SH	Share bus interface	Master drives bus; slaves sense bus voltage - single-wire interconnect enabling N+1 redundancy without centralized controller.
7 CGA	Current gain adjust output	Drives external R_CGA to set share bus gain; defines maximum V_SH = V_CC − 2.2 V independent of output voltage.
8 V_CC	Supply voltage	Powers all internal circuitry; also sets upper clamp limit for SH and CGA pins - eliminates need for external bus voltage regulation.

Key Features

Feature	Design Value
Auto-switching high/low-side sensing	Eliminates external configuration jumpers; seamless transition at 1.6 V CS+ with 0.16 V hysteresis prevents oscillation.
Full differential current sense	≤2 mV input offset enables accurate sharing even with 50 mV sense voltage, reducing I²R losses in R_SENSE.
V_CC-clamped share bus	Removes dependency on output voltage rail - simplifies design for multi-rail systems and avoids bus overvoltage during startup/fault.
SSSI-compliant interface	Meets Server System Infrastructure specification for interoperability in standardized server power architectures.
Thermal stress equalization	Enables uniform current distribution across modules, extending MTBF by reducing hot-spot formation in parallel converter stacks.

Applications

Web Server Power Supply

Industrial Redundant PSU

Use Scenario: Dual 12 V/200 A power supplies feeding a high-density rack server with N+1 redundancy.

IC Role / Device Role / Timing Role: Load share controller coordinating up to 20 modules via single-wire share bus; master unit sets bus voltage proportional to highest output current.

Use Value: Enables hot-swap capability and graceful degradation - single module failure reduces available capacity but maintains full system operation.

Use Scenario: 48 V telecom rectifier system with three paralleled 3 kW modules supporting critical infrastructure.

IC Role / Device Role / Timing Role: High-side current sensing on output bus with remote voltage sensing; UVLO hysteresis prevents cycling during grid sags.

Use Value: Achieves ≤±3% current imbalance across modules at full load, meeting IEC 62368-1 thermal derating requirements.

High-Density DC-DC Converter

Medical Grade Power System

Use Scenario: 48 V to 12 V intermediate bus converter stack in compact base station equipment.

IC Role / Device Role / Timing Role: Low-side sensing on ground-return path; SDA slew rate >0.8 V/μs ensures <10 μs response to load steps.

Use Value: Reduces required sense resistor power rating by 40% vs. fixed-gain alternatives due to ±1% mirror accuracy.

Use Scenario: Redundant 24 V/10 A power system for patient monitoring devices requiring continuous uptime.

IC Role / Device Role / Timing Role: Master-slave arbitration via share bus; ADJ pin sinks up to 13 mA to trim slave output without modifying feedback divider.

Use Value: Meets IEC 60601-1 creepage/clearance requirements by eliminating high-voltage sensing components on primary side.

Equivalent & Alternatives

The following parts are listed as comparable options for similar load share controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UC3907DW	Requires external op-amps for high-side sensing; no auto-switching; 10 V max V_CC; no V_CC-clamped share bus.	Designed for lower-current telecom systems (<50 A/module); lacks SSSI compliance and remote sense compatibility.	Choose only if legacy UC3907 footprint reuse is mandatory and V_CC < 10 V.
LM5069MMX-2	Hot-swap controller with integrated MOSFET drivers; no share bus architecture; current sharing requires external DAC + analog bus.	Targeted at inrush limiting and fault protection, not precision load balancing; no support for >4 paralleled modules.	Select when overcurrent shutdown and soft-start are prioritized over fine-grained current matching.

Compared with UC3907DW and LM5069MMX-2, the L6615D013TR delivers true plug-and-play current sharing across ≥20 modules with no external active components, V_CC-referenced bus clamping, and SSSI compliance - making it uniquely suited for modern high-density server and telecom power systems.

Availability

L6615D013TR is available at Aetrix Electronics and suitable for distributed power systems, high-density DC-DC converters, and (N+1) redundant server power supplies requiring stable component supply and long-term lifecycle support.

Supply support for L6615D013TR 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, and microcontroller technologies for industrial, automotive, and computing markets.

The L6615 belongs to ST's high-reliability power system controller product line, engineered specifically for modular, redundant DC-DC architectures in datacenter and telecom infrastructure where thermal management and fault tolerance are critical.

FAQ

What is the maximum number of L6615D013TR units that can be paralleled on a single share bus?

The L6615D013TR supports up to 20 paralleled modules, as confirmed in the official datasheet (Section 1, "Applications"). This limit arises from the 8 mA maximum output current capability of the master's share drive amplifier and the 32 kΩ input impedance of each slave's share sense amplifier - ensuring bus voltage regulation remains within specification across all operating conditions.

Can the L6615D013TR perform high-side current sensing on a 48 V output rail?

Yes. The L6615D013TR supports high-side sensing with a common-mode input range of 0 V to V_CC, and its CS+ pin tolerates voltages up to V_CC (max 22 V). For 48 V rails, an external level-shifting circuit or isolated amplifier is required upstream - the device itself does not support direct 48 V high-side sensing.

How does the L6615D013TR handle mismatched sense resistors across paralleled modules?

The L6615D013TR compensates for resistor mismatch via its adjustable gain architecture: the R_CGA/R_G ratio sets per-module gain, allowing calibration to achieve ≤±3% current imbalance. Datasheet Equation 8 confirms closed-loop forcing of slave CGA voltages to match master V_SH, making final sharing accuracy dependent on external component tolerances, not internal mismatches.

Is the L6615D013TR pin-compatible with earlier revisions like L6615D?

Yes. The L6615D013TR is a tape-and-reel variant of the L6615D in SO8 package, with identical pinout, electrical characteristics, and functionality. The "013TR" suffix denotes packaging (13-inch reel); no silicon or parametric changes exist between L6615D and L6615D013TR - both comply with DocID8881 Rev 5.

L6615D013TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: Power Supplies, Converters, Controllers

Current - Supply:: 5mA

Voltage - Supply:: 2.7V ~ 22V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

L6615D013TR FAQ

1.How can I place an order for L6615D013TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L6615D013TR 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 L6615D013TR reliable?

The price and inventory of L6615D013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6615D013TR is usually 5 days.

3.What payment methods are accepted for L6615D013TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6615D013TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L6615D013TR?

L6615D013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L6615D013TR 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 L6615D013TR?

For technical support, including L6615D013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6615D013TR requirements.

6.How does Aetrix verify that L6615D013TR is sourced from the original manufacturer or authorized distributors?

All L6615D013TR 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 L6615D013TR meets industry standards.

7.What is the process for return or replacement of L6615D013TR?

All L6615D013TR units undergo pre-shipment inspection (PSI). If there is an issue with L6615D013TR, 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 L6615D013TR part is unused and in its original packaging.

Return procedure for L6615D013TR:

1.Submit a request within 90 days.

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

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