L6997S STMicroelectronics Integrated Circuit (Other) In Stock
STMicroelectronics L6997S is a dual-channel voltage-mode PWM buck controller supporting 35 V step-down conversion with a 3 V to 5.5 V input range in a 20-pin TSSOP package. It enables synchronous buck regulation for dual-rail power supplies in embedded and industrial systems. Available in stock with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Other
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- L6997S Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of L6997S?
- Dual-channel voltage-mode PWM buck controller enables two independent step-down outputs from a single 20-pin TSSOP device
- Wide 3 V to 5.5 V input voltage range with 3.3 V nominal supply allows direct integration into standard embedded system power architectures
- Voltage-mode PWM control with programmable switching frequency provides predictable loop design and low EMI for noise-sensitive applications
- RoHS-compliant lead-free construction (JESD-609 e4) in compact 20-pin TSSOP package (R-PDSO-G20) for dense power supply layouts
What is L6997S used for?
The L6997S is designed for dual-rail point-of-load power supplies in microprocessor and FPGA boards that require two independently regulated step-down voltages from a 3.3 V bus. Its dual-channel architecture reduces BOM complexity in industrial controllers, networking equipment, and embedded computing modules where separate core and I/O supply rails must be generated from a single PWM controller IC in a 20-pin TSSOP footprint.
What are the specifications of L6997S?
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 5.5V |
| Input Voltage-Min | 3V |
| Input Voltage-Nom | 3.3V |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP20,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | PUSH-PULL |
| Switching Frequency-Max | 500kHz |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the L6997S datasheet?
L6997S Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for L6997S?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many independent buck outputs does L6997S control, and what input voltage does it require?
The L6997S controls 2 independent buck converter channels from a single IC, operating from an input voltage of 3 V to 5.5 V with a 3.3 V nominal supply, enabling dual-rail step-down regulation from standard 3.3 V bus rails found in embedded computing and networking equipment.
What control mode does L6997S use, and why does voltage-mode PWM benefit EMI-sensitive designs?
L6997S uses voltage-mode pulse-width modulation (PWM) control, which provides a fixed switching frequency determined by an external resistor or capacitor. This fixed-frequency operation makes EMI filtering straightforward, as the dominant switching noise is confined to a known fundamental frequency and its harmonics, simplifying compliance with EMC standards such as CISPR 22 Class B.
What package does L6997S use, and how does it compare to a SOIC-20 for high-density power supply layouts?
L6997S is housed in a 20-pin TSSOP package (JESD-30 code R-PDSO-G20), which has a pin pitch of 0.65 mm and a smaller footprint than a standard 20-pin SOIC, saving approximately 60 mm² of PCB area. This space savings is valuable in server blade and telecom shelf designs where multiple power supply circuits must coexist within a constrained 100 mm x 100 mm board area.
When should a designer choose L6997S over two separate single-channel buck controllers for a dual-rail FPGA supply?
L6997S is the better choice when both output rails share a common 3.3 V input bus, as its dual-channel integration reduces component count by 1 controller IC, simplifies PCB routing by centralizing gate drive and feedback signals, and typically lowers total BOM cost by 15% to 25% compared to 2 discrete single-channel controllers in equivalent TSSOP packages.
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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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