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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

STMicroelectronics L5983TR

Name: L5983TR
Brand: STMicroelectronics
SKU: L5983TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L5983TR

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-VFDFN Exposed Pad

Datasheet:: L5983TR.pdf

Description:: IC REG BUCK ADJ 1.5A 8VFQFPN

Quantity:: RFQ Add To RFQ list

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Inventory:4,037

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Product details

Overview

L5983TR from STMicroelectronics is a 1.5 A step-down switching regulator with integrated P-channel MOSFET, operating from 2.9 V to 18 V input and delivering adjustable output voltage down to 0.6 V. It features 250 kHz base switching frequency (programmable up to 1 MHz), internal soft-start, 100% duty-cycle low-dropout operation, and overcurrent/thermal protection in a VFQFPN8 3 × 3 mm package - used in LCD TV power rails, FPGA core supplies, and XDSL DC-DC modules.

For engineers reviewing the L5983TR datasheet, L5983TR pinout, L5983TR application, or L5983TR equivalent, key selection criteria include input voltage range (2.9–18 V), output current capability (≥1.5 A DC), programmable switching frequency (250 kHz–1 MHz), feedback reference accuracy (0.593–0.607 V), and thermal resistance (60 °C/W) for industrial-grade thermal design validation.

Technical Context

The L5983TR implements voltage-mode PWM control with feedforward compensation: input voltage and switching frequency variations dynamically adjust sawtooth slope to maintain constant PWM gain. Its oscillator supports master/slave synchronization via the SYNCH pin, enabling phase-shifted dual-regulator operation to reduce input ripple RMS current.

Functional blocks include a 0.6 V precision reference, error amplifier with 100 dB open-loop gain and 4.5 MHz GBWP, peak-current-limited P-channel MOSFET driver (R_DS(on) = 140–220 mΩ), and hiccup-mode overcurrent protection triggered after 200 ns blanking time - ensuring robust short-circuit handling without latch-off.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	1.5 A DC continuous; supports >1.5 A transient loads due to 2.0 A min. current limit
Input voltage range	2.9 V to 18 V; compatible with 3.3 V bus systems and automotive 12 V rails
Feedback reference	0.6 V ±7 mV; enables precise output regulation with external resistor divider
Switching frequency	250 kHz base (FSW pin floating); adjustable to 1 MHz via external resistor for EMI optimization
Thermal resistance	R_thJA = 60 °C/W; achieved with VFQFPN8 exposed pad on standard PCB layout
Quiescent current	2.4 mA active; 20–30 µA in inhibit standby mode for low-power system states
Soft-start duration	7.4–9.1 ms at 250 kHz; scales inversely with FSW to ensure monotonic V_OUT ramp

Pinout & Package

VFQFPN8 3 × 3 mm package with exposed thermal pad (pin 1 marked by dot); RoHS-compliant, halogen-free, and qualified for industrial temperature range (−40 °C to +125 °C).

Pin/Terminal	Circuit Role	Design Meaning
OUT (1)	Regulated output node	Connects directly to LC filter output; carries full load current and high di/dt switching transients
SYNCH (2)	Synchronization I/O	Configurable as master/slave sync output or external clock input; enables phase interleaving with second L5983TR
INH (3)	Enable/disable control	Active-high logic: <0.6 V = ON, >1.9 V = OFF; internal pull-up disables device if left floating
COMP (4)	Error amplifier output	External compensation network connection point; drives Type II or Type III loop filters
FB (5)	Voltage feedback input	Senses output via resistor divider; internal 0.6 V reference sets regulation threshold
FSW (6)	Frequency set input	Resistor-to-ground sets switching frequency; open = 250 kHz, 33 kΩ = 1 MHz
GND (7)	Power and signal ground	Common return for power path and analog circuitry; must connect to exposed pad for thermal performance
VCC (8)	Unregulated input supply	Powers internal bias circuits and gate driver; requires local 10 µF ceramic capacitor

Key Features

Feature	Design Value
Voltage feedforward	Dynamic sawtooth slope adjustment maintains constant PWM gain across input voltage changes - improves line transient response
Zero-load operation	Stable regulation at 0 A output current; no minimum load requirement simplifies standby power design
Hiccup-mode OCP	Auto-retry protection during sustained overload: 2048-clock-cycle off-time followed by soft-start recovery
100% duty cycle	Supports dropout operation down to V_OUT = V_IN − 0.3 V; enables use in post-regulation or battery-preserving configurations
Thermal shutdown hysteresis	Turns off at 150 °C junction; resumes at ~130 °C - prevents thermal oscillation during sustained high-temp operation

Applications

Consumer LCD Power

FPGA Core Supply

Use Scenario: Powering 3.3 V and 1.2 V rails in LCD TV main board with variable backlight load.

IC Role / Device Role / Timing Role: Primary buck converter regulating VDDIO and VCCINT for display controller and timing ICs.

Use Value: 2.9 V minimum input enables direct 3.3 V bus regulation; 1.5 A output sustains burst current during frame refresh.

Use Scenario: Providing configurable 1.2 V core voltage to Xilinx Spartan-6 FPGA during configuration and active operation.

IC Role / Device Role / Timing Role: Adjustable-output buck regulator with soft-start synchronized to FPGA INIT_B signal.

Use Value: 0.6 V reference and external resistor divider allow precise 1.2 V ±1% regulation; hiccup OCP prevents damage during bitstream loading faults.

XDSL Line Card DC-DC

Car Audio DSP Supply

Use Scenario: Generating isolated 5 V and 3.3 V supplies in ADSL2+ line card using discrete transformer-based topology.

IC Role / Device Role / Timing Role: Secondary-side synchronous buck controller driving external MOSFETs for high-efficiency conversion.

Use Value: SYNCH pin enables interleaved operation with primary-side controller to reduce input capacitor RMS current by 30%.

Use Scenario: Delivering clean 1.8 V supply to TI TMS320C55x DSP in automotive head unit with wide input voltage swing (9–16 V).

IC Role / Device Role / Timing Role: Input-rail tolerant buck regulator with UVLO hysteresis (0.175 V) preventing brownout oscillation during cranking.

Use Value: 2.9–18 V input range covers cold-crank (6.5 V) to load-dump (18 V); 60 °C/W R_thJA ensures thermal stability in sealed enclosure.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2307DN-LF-Z	Fixed 3.3 V/5 V outputs only; no adjustable FB reference; lower max input (23 V vs. 18 V)	Targeted at cost-sensitive consumer adapters; lacks SYNCH and soft-start programmability	Select when fixed output and minimal BOM count outweigh need for flexibility
TPS54302DDCR	Higher IQ (24 µA vs. 20–30 µA); integrated boot diode; no exposed thermal pad in SOT-23-6	Better suited for space-constrained portable designs; lower thermal performance limits >1 A continuous use	Select when PCB area is critical and thermal margin >10 °C is available

Compared with MP2307DN-LF-Z and TPS54302DDCR, the L5983TR provides superior thermal management (60 °C/W), full output adjustability (0.6 V–V_IN), and synchronization capability - making it preferred for industrial and multi-rail embedded systems requiring reliability and design flexibility.

Availability

L5983TR is available at Aetrix Electronics and suitable for LCD TV power subsystems, FPGA core voltage regulation, and XDSL line card DC-DC conversion requiring stable component supply across extended temperature and long production lifecycles.

Supply support for L5983TR 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 analog ICs for industrial, automotive, and consumer markets.

The L5983TR belongs to ST's high-efficiency monolithic buck regulator product line, designed specifically for compact, thermally constrained embedded power supplies needing wide input range and robust protection.

FAQ

What is the minimum input voltage required for L5983TR startup?

The L5983TR turns on when V_CC exceeds 2.9 V, with 0.175 V hysteresis to prevent oscillation during brownout conditions. Startup is guaranteed at 2.9 V across −40 °C to +125 °C junction temperature, verified per absolute maximum ratings table in DocID13005 Rev 8.

Can L5983TR operate with zero output load?

Yes - the L5983TR maintains stable regulation at 0 A output current due to its voltage-mode control architecture and zero-load current operation feature. No minimum load resistor is required, enabling efficient standby modes in always-on consumer devices.

How does the SYNCH pin enable phase interleaving?

When two L5983TR devices have their SYNCH pins connected, the higher-frequency unit acts as master and the other as slave, resulting in 180° phase shift between switching nodes. This reduces total input capacitor RMS current by up to 30%, validated in application note AN4405 for dual-buck configurations.

What is the purpose of the 200 ns blanking time in overcurrent protection?

The 200 ns blanking time disables current sensing during initial MOSFET turn-on to avoid false triggering from switching noise and parasitic ringing. It ensures accurate peak-current detection only during steady-state conduction, as confirmed in Section 4.4 of the functional description (DocID13005 Rev 8, p.13).

L5983TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-VFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.9V

Voltage - Input (Max):: 18V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 18V

Current - Output:: 1.5A

Frequency - Switching:: 250kHz ~ 1MHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-VFQFPN (3x3)

L5983TR FAQ

1.How can I place an order for L5983TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L5983TR 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 L5983TR reliable?

The price and inventory of L5983TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L5983TR is usually 5 days.

3.What payment methods are accepted for L5983TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L5983TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L5983TR?

L5983TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L5983TR 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 L5983TR?

For technical support, including L5983TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L5983TR requirements.

6.How does Aetrix verify that L5983TR is sourced from the original manufacturer or authorized distributors?

All L5983TR 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 L5983TR meets industry standards.

7.What is the process for return or replacement of L5983TR?

All L5983TR units undergo pre-shipment inspection (PSI). If there is an issue with L5983TR, 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 L5983TR part is unused and in its original packaging.

Return procedure for L5983TR:

1.Submit a request within 90 days.

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

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