L5983 STMicroelectronics Integrated Circuit (Small Outline No-lead) In Stock
The L5983 is a single-channel step-down switching regulator from STMicroelectronics delivering up to 1.5A output current with an adjustable output voltage and 2.9V to 18V input range. It employs voltage-mode control for stable regulation in industrial and consumer power conversion applications. Packaged in an 8-pin VFQFPN for compact, thermally efficient PCB designs.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline No-lead
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- L5983 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of L5983?
- Single-channel step-down regulator with up to 1.5A output current
- Wide 2.9V to 18V input range for 5V, 12V, and automotive bus compatibility
- Adjustable output voltage set via external resistor divider
- Voltage-mode PWM control for predictable loop compensation
- 8-pin VFQFPN package with exposed pad for improved thermal dissipation
- Internal soft-start limiting inrush current during power-up
What is L5983 used for?
The L5983 is used in point-of-load power conversion for industrial control boards, home automation modules, and embedded systems where a 12V or 5V bus must be stepped down to core logic voltages of 1.8V, 2.5V, or 3.3V at up to 1.5A. Its wide 2.9V to 18V input range also makes it suitable for automotive accessory power supplies and battery-powered equipment that may experience wide supply variations. The compact VFQFPN package and adjustable output simplify multi-rail power designs with a single regulator topology across different voltage requirements.
What are the specifications of L5983?
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | VOLTAGE-MODE |
| Input Voltage-Max | 18V |
| Input Voltage-Min | 2.9V |
| Input Voltage-Nom | 12V |
| JESD-30 Code | S-PDSO-N8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 1.5A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOLCC8,.11,20 |
| Package Shape | SQUARE |
| Package Style | SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | BUCK |
| Switching Frequency-Max | 1000kHz |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline No-lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the L5983 datasheet?
L5983 Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for L5983?
Compatible alternatives and drop-in replacements for L5983:
Frequently Asked Questions
What input voltage range does the L5983 support, and how does this suit 12V industrial bus applications?
The L5983 accepts input voltages from 2.9V to 18V, which directly spans the nominal 12V industrial bus and its ±20% variation range (9.6V to 14.4V) without requiring additional protection. The 18V maximum rating also covers load-dump transients on 12V automotive bus lines, making the L5983 usable in both benign industrial and mildly transient vehicular environments. This wide input tolerance eliminates the need for a pre-regulator stage in most 12V-input designs.
How is the output voltage of the L5983 set, and what output range is achievable?
The L5983 output voltage is programmed using a two-resistor voltage divider connected from the output to the feedback pin (FB) referenced to an internal 1.235V reference. By selecting the divider ratio, the output can be set to any value from approximately 1.24V up to just below the input voltage, supporting common logic rails such as 1.8V, 2.5V, 3.3V, and 5V at up to 1.5A. The feedback pin impedance is high, so standard 1% resistors in the 10 kΩ to 100 kΩ range are sufficient for stable regulation.
How does the VFQFPN package of the L5983 improve thermal performance compared to an SOIC-8 variant?
The VFQFPN (8-pin QFN) features an exposed thermal die-attach pad on the bottom that directly conducts heat to the PCB copper pour, yielding a thermal resistance (θJA) approximately 30% to 50% lower than a standard SOIC-8 without a thermal pad. At 1.5A output current this lower thermal resistance reduces junction temperature rise by 10°C to 20°C under typical conditions, extending the regulator's headroom before reaching the 150°C maximum junction temperature and enabling higher ambient temperature operation without derating output current.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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