Power semiconductors
EN5335QI – 3A Integrated Inductor Buck PowerSoC
Basic Product Information
Part Number: EN5335QI
| Field | Value |
|---|---|
| Manufacturer | Altera (now Intel Corporation) |
| Device Type | EN5335QI |
| Package | 44-PowerQFN Module (10.0mm x 7.5mm x 1.9mm) |
| Model Interpretation | EN = Enpirion PowerSoC series, 5335 = 3A synchronous buck converter, Q = QFN package, I = Industrial temperature range |
| Compliance | RoHS Compliant, REACH SVHC Compliant |
| Grade | Industrial / ITE (Commercial) |
Core Electrical Parameters
| Parameter | Value | Unit |
|---|---|---|
| Topology | Synchronous Buck (Step-Down) | — |
| Input Voltage Range | 2.375 — 6.6 | V |
| Nominal Input Voltage | 5.5 | V |
| Output Voltage Range | 0.8 — 3.3 (3-pin VID programmable) | V |
| Maximum Output Current | 3 | A |
| Maximum Output Power | 10 | W |
| Switching Frequency | 5 | MHz |
| Efficiency (Peak) | 93 | % |
| Load Regulation | 4 | % |
| Over-Current Trip Point | 4.5 (nominal) | A |
| Over-Voltage Threshold | 120% of programmed Vout | — |
| Thermal Shutdown | 150 | °C |
| Operating Temperature Range | -40 to +85 | °C |
| Junction Temperature Rating | -40 to +125 | °C |
| Control Mode | Voltage-Mode PWM | — |
| Integrated Inductor | Yes | — |
| Control Feature | Enable (Active High) | — |
| MSL Rating | 3 (168 Hours) | — |
Core Features & Advantages
The EN5335QI delivers exceptional performance for demanding point-of-load power conversion applications. As a fully integrated PowerSoC (Power System on a Chip), it incorporates the controller, power MOSFETs, compensation network, and inductor into a single 10.0mm x 7.5mm QFN package — eliminating external inductor selection and simplifying PCB layout.
- Primary Function: 3A synchronous step-down DC-DC conversion for FPGA, ASIC, and processor core/IO rail power delivery
- Key Advantages:
- Integrated Inductor Design: Eliminates the most space-consuming external component, reducing solution footprint to just 75mm² and removing inductor selection risk from the design cycle.
- 5 MHz Switching Frequency: Enables use of low-profile ceramic capacitors only (no electrolytic), achieving extremely fast transient response and minimal output ripple — critical for FPGA core voltage tolerances.
- 3-Pin VID Output Programming: Supports seven preset output voltages (0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V) without external resistor dividers, simplifying BOM and improving manufacturability.
- 93% Peak Efficiency: Significantly reduces power dissipation in space-constrained and thermally challenging environments, enabling fanless designs in many applications.
- Comprehensive Protection Suite: Over-current protection (OCP, adjustable via ROCP pin), over-voltage protection (OVP at 120% Vout), thermal shutdown (150°C), and input under-voltage lockout (UVLO) — all ensuring robust system reliability.
- Internally Compensated: Type 3 internal compensation optimized for ~50μF output capacitance, eliminating external compensation components and design tuning effort.
Typical Application Scenarios
- Industry: Industrial / Communications / Consumer Electronics / Data Center
- Equipment: FPGA development boards, telecom line cards, embedded computing modules, networking equipment, portable instrumentation
- Use Cases:
- Intel/Altera FPGA core and I/O voltage rails (Cyclone, Arria, Stratix series power trees)
- Point-of-load (PoL) power conversion in telecom and networking equipment where board space is at a premium
- Embedded processor and DSP core power delivery requiring fast transient response and tight voltage regulation
- Low-profile, high-density power systems in portable and rack-mounted instrumentation
Market Reference Price
| Market | Price Range | Currency |
|---|---|---|
| Huaqiangbei Spot | $2.00 – $5.50 | USD |
| Overseas B2B | $3.45 – $34.90 | USD |
Note: Prices vary significantly by quantity, supplier, and channel. Overseas distributor pricing (e.g., Mouser at $34.90/unit) reflects EOL premium surcharges. Huaqiangbei spot market offers substantially lower pricing but requires careful authenticity verification. This device has been declared End-of-Life by Intel — contact suppliers for exact quotes and availability.
Related Models Comparison
| Model | Difference | Target Application |
|---|---|---|
| EN5336QI | Same 3A/5MHz platform, different VID preset options and output voltage configurations | FPGA PoL with alternative voltage presets |
| EN5337QI | Same family, 3A output with different input range (2.4-5.5V), smaller 4x7mm footprint | Space-constrained 5V-input-only systems |
| LTM4623 (ADI) | Drop-in replacement recommended by ADI; μModule format; higher output current capability (3A); wider input range up to 20V | Upgrade path for EOL replacement; broader input range designs |
| MIC33M356-SAYMP-TR (Microchip) | Active replacement per Microchip cross-reference; higher output voltage accuracy; programmable soft start; CISPR32/25 compliant | EMI-sensitive applications requiring active compliance certification |
| FS1406-2500-AS (TDK) | Mouser-recommended replacement; uPOL format; higher 6A output; 2.5V fixed output | Higher current rails with fixed 2.5V requirement |
| MPM3833CGRH-P (MPS) | MPS replacement; smaller form factor; comparable 3A output | Compact designs requiring a modern active-source alternative |
