PM6681A STMicroelectronics Integrated Circuit (Quad Flat No-Lead) In Stock
STMicroelectronics PM6681A is a dual voltage-mode PWM DC-DC controller with 6V to 36V input range, two independently adjustable outputs from 0.9V to 5V and 0.9V to 3.3V, in a 32-pin VFQFPN EP package. Designed for telecom, server, and industrial multi-rail power systems. Available from stock with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Quad Flat No-Lead
- Pin Count
- 32
- Lifecycle
- OBSOLETE
- Datasheet
- PM6681A Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual voltage-mode PWM controller with two independently adjustable output rails: 0.9V–5V and 0.9V–3.3V for multi-rail power design
- Wide 6V–36V input voltage range (nominal 24V) supporting 12V and 24V industrial bus rails in a single IC
- 32-pin VFQFPN EP package with exposed pad for improved thermal performance in high-density power supply layouts
Applications
The PM6681A dual DC-DC controller is well suited for multi-rail power supply designs in telecom base stations, server boards, and industrial automation equipment that require both a core voltage rail (0.9V–1.8V) and a logic voltage rail (1.8V–3.3V) from a single 24V intermediate bus. Its voltage-mode PWM control with adjustable outputs simplifies feedback network design and allows tight output voltage regulation across the 6V–36V input range.
Specifications
| Manufacturer Package Code | VFQFPN |
| YTEOL | 0 |
| Additional Feature | ALSO OPERATES IN TWO ADJUSTABLE MODE FROM 0.9 V TO 5 V AND 0.9 V TO 3.3 V |
| Analog IC - Other Type | DUAL SWITCHING CONTROLLER |
| Control Mode | VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 36V |
| Input Voltage-Min | 6V |
| Input Voltage-Nom | 24V |
| JESD-30 Code | S-XQCC-N32 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 0.4A |
| Output Voltage-Nom | 5V |
| Package Body Material | UNSPECIFIED |
| Package Equivalence Code | LCC32,.2SQ,20 |
| Package Shape | SQUARE |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | PUSH-PULL |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the PM6681A dual-controller architecture simplify a server board's multi-rail power sequencing compared to two single controllers?
The PM6681A integrates two independent voltage-mode PWM controllers in one 32-pin package, reducing BOM count and PCB area compared to two discrete single-channel controllers. Both channels share a common input bus between 6V and 36V, and each output can be independently set between 0.9V and 5V or 0.9V and 3.3V with external resistors, enabling precise sequenced power-up for FPGA core and I/O rails.
What input voltage range does PM6681A support and which industrial power bus architectures does it fit?
The PM6681A accepts input voltages from 6V to 36V, with a nominal design point of 24V. This range covers both the 12V standard server bus and the 24V industrial intermediate bus, making it versatile for telecom rectifier outputs, battery-backed 24V systems, and 28V avionics buses where a dual-output point-of-load converter is needed.
For a compact telecom line card, how does PM6681A's VFQFPN EP package benefit thermal and space performance?
The 32-pin VFQFPN EP (exposed pad) package transfers heat directly to the PCB ground plane through the thermal pad, achieving lower junction-to-board resistance than a standard QFP. The small QFN footprint — approximately 5 mm × 5 mm — allows dual-rail power delivery in under 30 mm² of board area, which is critical in high-density blade servers and compact telecom cards operating at 24V input.
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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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