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onsemi NCP3296MNTXG
- Part No.:
- NCP3296MNTXG
- Manufacturer:
- onsemi
- Package:
- 34-PowerWFQFN
- Datasheet:
-
NCP3296MNTXG.pdf
- Description:
- IC REG BUCK ADJ 40A 34WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
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Product details
Overview
NCP3296MNTXG from onsemi is a 40 A stackable synchronous buck regulator IC operating from 3 V to 18 V input, delivering programmable 0.5–5.5 V output with remote sensing, fixed-frequency current-mode control, and integrated 5 V LDO. It serves as a high-density point-of-load (POL) regulator in multi-phase server and telecom power rails.
For engineers reviewing the NCP3296MNTXG datasheet, pinout, applications, or equivalent options, key selection factors include its 40 A per-phase capability, stackability up to 160 A via interleaved synchronization, programmable current limit (10–60 A), thermal shutdown at 170 °C, and WQFN34 5×7 mm package with 0.5 mm pitch.
Technical Context
The NCP3296MNTXG implements fixed-frequency (200–2000 kHz) current-mode PWM control with cycle-by-cycle valley current limiting, enabling fast transient response and stable regulation across wide VIN/VOUT ranges. Its architecture supports master/slave configuration via FB/VSNS− pin programming for 2–4 phase interleaving.
It integrates dual gate drivers (high-side RDS(on) = 1.8 mΩ, low-side RDS(on) = 0.8 mΩ), a 5 V LDO for internal bias (or external VCC support), and comprehensive protection including OVP/UVP, thermal shutdown (TSD = 170 °C), and selectable hiccup/latch-off fault response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 40 A continuous per device; scalable to 160 A using up to four parallel NCP3296MNTXG in interleaved multi-phase configuration. |
| Input Voltage Range | 3 V to 18 V - supports common intermediate bus voltages (5 V, 12 V) and enables single-rail compatibility across diverse systems. |
| Output Voltage Range | 0.5 V to 5.5 V with remote sense - enables precise regulation at load point for CPU/GPU/FPGA core rails requiring tight tolerance. |
| Switching Frequency | 200–2000 kHz, resistor-programmable - allows optimization of efficiency vs. size trade-offs via external RSYNC/FSET. |
| Junction Temperature | −40 °C to +150 °C operating; thermal shutdown at 170 °C - ensures robust operation in thermally constrained server and telecom environments. |
| Package | WQFN34 5×7 mm, 0.5 mm pitch (Case 510CL) - high thermal performance with exposed thermal pad and 34-pin power-ground distribution. |
| Protection Features | Programmable current limit (10–60 A), OVP/UVP, input OVP/UVLO, thermal shutdown, and selectable hiccup or latch-off response - reduces need for external supervision circuitry. |
Pinout & Package
Package: WQFN34 (5 mm × 7 mm, 0.5 mm pitch), thermally enhanced with exposed paddle (Case 510CL). Pin assignment verified per onsemi datasheet Figure 7 and PIN DESCRIPTION table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1–3, 34) | Power Input | High-current input for high-side MOSFET drain; requires ≥22 µF ceramic bypass to PGND with low-impedance layout. |
| PHASE (Pin 4) | Power Node | Switch node return path for high-side gate driver; connects directly to inductor and BST capacitor. |
| BST (Pin 5) | Bootstrap Supply | Supplies gate drive voltage for high-side FET; requires 0.22 µF ceramic cap to PHASE and series RBST resistor. |
| PGOOD (Pin 6) | Logic Output | Open-drain power-good indicator; asserts high when VOUT is within ±6% of target (VFB window). |
| GND / PGND (Pins 7,16,18–20,32–33) | Power Ground | Dedicated low-impedance ground paths for power MOSFET sources; must be connected to system ground with minimal loop area. |
| FB (Pin 8) | Analog Input | Inverting error amplifier input; used for feedback and slave phase identification via voltage level. |
| COMP (Pin 9) | Analog Output | Error amplifier output; connects to external compensation network (RC) for loop stability tuning. |
| VSET/FAULT (Pin 13) | Analog I/O | Programs boot-up voltage via resistor-to-ground; also outputs master fault signal in multi-phase configurations. |
| IMON/ILIM (Pin 12) | Analog I/O | Programs per-phase valley current limit (10–60 A) and selects hiccup/latch-off mode via resistor value. |
| SYNC/FSET (Pin 17) | Analog I/O | Master outputs sync clock; slave accepts sync input; resistor-to-ground sets switching frequency per phase. |
| EN (Pin 21) | Logic Input | Enable control with programmable UVLO threshold (3.0 V rising); supports external resistor divider for custom input monitoring. |
| VCC (Pin 22) | Power Supply | 5 V LDO output and controller bias supply; requires ≥2.2 µF ceramic bypass to GND. |
| VIN (Pin 23) | Power Input | LDO input; connect to PVIN if LDO enabled, or to external 5 V source if LDO disabled (Figure 2). |
| PVCC (Pin 24) | Power Supply | Gate driver supply; requires ≥4.7 µF/25 V ceramic bypass to PGND for robust high-current switching. |
| SW (Pins 26–31) | Switch Node | High-current connection to external inductor; six parallel pins reduce conduction loss and thermal stress. |
Key Features
| Feature | Design Value |
|---|---|
| Stackable multi-phase operation | Up to four NCP3296MNTXG devices synchronized via SYNC/FSET pin for 160 A total output with interleaved ripple cancellation. |
| Programmable current limit & protection mode | Resistor-selectable valley current limit (10–60 A) and hiccup/latch-off response - enables tailored fault handling without firmware changes. |
| Remote voltage sensing | VSNS− pin enables Kelvin sensing at load, compensating for PCB IR drop to maintain ±0.5% regulation accuracy under dynamic load. |
| Pre-bias start-up support | Starts safely into pre-charged output rails without reverse current flow - critical for hot-swap and redundant power systems. |
| Integrated 5 V LDO with external option | On-chip LDO powers controller logic; configurable to accept external 5 V supply for improved efficiency or noise isolation in sensitive applications. |
| Thermal-aware design | RJA = 14.6 °C/W (eval board), RJB = 1.5 °C/W - optimized for direct thermal coupling to PCB copper, supporting 40 A continuous in compact layouts. |
Applications
| Server Core Voltage Regulation | Telecom Radio Unit Power |
|---|---|
Use Scenario: Delivering tightly regulated 0.8–1.2 V at up to 120 A to high-performance CPUs and ASICs in 1U/2U rack servers with strict thermal envelopes. IC Role / Device Role / Timing Role: Primary POL regulator in 3-phase interleaved configuration, providing fast transient response (<500 ns load step recovery) and remote sensing for sub-1% output accuracy. Use Value: Enables higher power density than discrete controllers while reducing component count by integrating gate drivers, LDO, and multi-phase sync logic. |
Use Scenario: Powering RF transceivers and digital baseband processors in 5G massive MIMO radio units where EMI and thermal management are critical. IC Role / Device Role / Timing Role: High-efficiency 4-phase POL stage converting 12 V intermediate bus to 3.3 V/5.0 V rails with <10 mVpp output ripple via interleaving. Use Value: Reduces magnetic component size by 4× and lowers system temperature rise by distributing heat across four identical ICs. |
| Networking Switch ASIC Supply | High-Density DC/DC Module |
Use Scenario: Supplying 1.8 V/25 A to packet processing ASICs in enterprise layer-3 switches with rapid load transients during traffic bursts. IC Role / Device Role / Timing Role: Single-phase NCP3296MNTXG configured with 500 kHz switching and programmable soft-start (1–20 ms) for inrush control. Use Value: Achieves >94% peak efficiency at 25 A (12 VIN/1.8 VOUT) and eliminates need for external current-sense amplifiers or protection ICs. |
Use Scenario: Embedded in compact 36×36 mm quarter-brick modules delivering 48 V to 3.3 V/40 A with full digital telemetry and PMBus compatibility. IC Role / Device Role / Timing Role: Core power stage with IMON analog current monitor output and PGOOD signaling for system-level health reporting. Use Value: Simplifies module design by replacing 3–4 discrete power stages with one stackable IC, reducing BOM cost and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2960A from Monolithic Power Systems | 40 A single-phase, 4.5–16 V input, but lacks native stackability and remote sensing; uses external current sense resistor. | Requires additional components for multi-phase sync and voltage margining; less suitable for high-accuracy POL rails. | Choose MP2960A only for cost-sensitive, single-phase designs where stackability and remote sense are not required. |
| ISL9123IRAJZ-T7A from Renesas | 30 A, 2.5–5.5 V input, ultra-low IQ (12 µA), but limited to 1.35 V max output and no programmable current limit. | Targeted at battery-powered portable devices, not high-current infrastructure applications. | ISL9123IRAJZ-T7A is unsuitable for server/telecom use cases due to lower current rating, narrower input range, and missing stack control features. |
Compared with MP2960A and ISL9123IRAJZ-T7A, the NCP3296MNTXG uniquely combines 40 A per-phase capability, seamless 2–4 phase stacking, remote sensing, and resistor-programmable protections-making it the only viable choice for high-density, thermally constrained infrastructure POL designs.
Availability
NCP3296MNTXG is available at Aetrix Electronics and suitable for server motherboard power delivery, 5G radio unit DC/DC conversion, and high-density telecom switch ASIC supplies requiring stable component supply and long-term industrial lifecycle support.
Supply support for NCP3296MNTXG 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
onsemi is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and 5G infrastructure markets.
The NCP3296MNTXG belongs to onsemi's high-current POL regulator product line, designed specifically for next-generation data center and telecom equipment demanding scalability, precision regulation, and thermal resilience in minimal PCB area.
FAQ
What is the maximum output current achievable with a single NCP3296MNTXG?
A single NCP3296MNTXG delivers up to 40 A continuous output current under recommended operating conditions (TJ ≤ 150 °C, proper thermal design). This rating assumes adequate PCB copper area, airflow, and input/output capacitance per the onsemi evaluation board layout. The device's RDS(on) values (1.8 mΩ high-side, 0.8 mΩ low-side) and WQFN34 thermal pad enable this high current in compact form factor. Exceeding 40 A requires paralleling multiple NCP3296MNTXG units.
Can NCP3296MNTXG operate without an external bootstrap capacitor?
No, the NCP3296MNTXG requires an external 0.22 µF ceramic capacitor between BST and PHASE pins to generate the high-side gate drive voltage. Omitting this capacitor prevents proper high-side FET turn-on and causes immediate functional failure. A series resistor (RBST) is also recommended to damp ringing. The datasheet explicitly specifies this as mandatory in the PIN DESCRIPTION for Pin 5 (BST).
How does NCP3296MNTXG support multi-phase interleaving?
The NCP3296MNTXG supports 2–4 phase interleaving via dedicated SYNC/FSET pin: the master device outputs a clock signal, while slaves accept it as synchronization reference. Phase count and master/slave roles are set by resistor values on MODE2/SFAULT and VSNS−/FB pins per Table 1 in the datasheet. This eliminates need for external clock generators and ensures precise 90° (4-phase) or 180° (2-phase) timing alignment.
What protection features are programmable on NCP3296MNTXG?
Four key protections are resistor-programmable on NCP3296MNTXG: (1) Valley current limit (10–60 A) via IMON/ILIM pin, (2) Fault response mode (hiccup or latch-off) via same pin, (3) Switching frequency (200–2000 kHz) via SYNC/FSET pin, and (4) Input UVLO threshold via EN pin divider. All are implemented without software or digital interface, enabling robust analog control in safety-critical systems.
Is remote voltage sensing mandatory for NCP3296MNTXG operation?
No, remote sensing is optional but strongly recommended for applications requiring tight output regulation under high load currents. When unused, VSNS− must be tied to local GND per datasheet guidance. With remote sense enabled, the NCP3296MNTXG compensates for PCB trace resistance, maintaining ±0.5% accuracy at the load point - critical for CPU/GPU core rails where even 10 mV deviation impacts performance.
NCP3296MNTXG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 34-PowerWFQFN
- 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):
- 3V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 40A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 34-WQFN (5x7)
NCP3296MNTXG FAQ
1.How can I place an order for NCP3296MNTXG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP3296MNTXG 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 NCP3296MNTXG reliable?
The price and inventory of NCP3296MNTXG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3296MNTXG is usually 5 days.
3.What payment methods are accepted for NCP3296MNTXG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3296MNTXG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP3296MNTXG?
NCP3296MNTXG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP3296MNTXG 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 NCP3296MNTXG?
For technical support, including NCP3296MNTXG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3296MNTXG requirements.
6.How does Aetrix verify that NCP3296MNTXG is sourced from the original manufacturer or authorized distributors?
All NCP3296MNTXG 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 NCP3296MNTXG meets industry standards.
7.What is the process for return or replacement of NCP3296MNTXG?
All NCP3296MNTXG units undergo pre-shipment inspection (PSI). If there is an issue with NCP3296MNTXG, 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 NCP3296MNTXG part is unused and in its original packaging.
Return procedure for NCP3296MNTXG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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