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onsemi NCP3136MNTXG
- Part No.:
- NCP3136MNTXG
- Manufacturer:
- onsemi
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
NCP3136MNTXG.pdf
- Description:
- IC REG BUCK ADJ 6A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
NCP3136MNTXG from onsemi is a fully integrated synchronous buck converter delivering up to 6.5 A instantaneous output current, operating from 2.9 V to 5.5 V input, with adjustable output from 0.6 V to 0.84 × VIN, and featuring 1.1 MHz fixed-frequency FCCM or automatic CCM/DCM mode for high-efficiency 3.3 V and 5 V step-down power rails in compact embedded systems.
For engineers reviewing the NCP3136MNTXG datasheet, pinout, applications, or equivalent options, key selection criteria include its dual-mode control architecture, integrated MOSFETs, power-good indicator, pre-bias startup support, and thermal/overvoltage/overcurrent protections - all in a 3 mm × 3 mm QFN16 package.
Technical Context
The NCP3136MNTXG implements voltage-mode PWM control with internal 600 mV reference (±1% tolerance) and supports two distinct operational modes: forced continuous conduction mode (FCCM) at 1.1 MHz ±10%, and automatic CCM/DCM mode enabled via external resistor on PS pin, enabling seamless transition between conduction modes based on load current.
Its protection suite includes cycle-by-cycle overcurrent limiting (7.6–8.8 A threshold), thermal shutdown at 130–150 °C with 40 °C hysteresis, UVLO (2.8 V trip, 110 mV hysteresis), and window-based power-good monitoring (±17% FB tolerance with 400 µs delay), all implemented with internal comparators and fault latching logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9 V to 5.5 V - supports direct connection to common system rails including USB 5 V and Li-ion battery outputs. |
| Output Current Capability | Up to 6.5 A peak - sufficient for powering SoCs, FPGAs, and DDR memory subsystems without external current boosting. |
| Switching Frequency | 1.1 MHz typical in FCCM mode - enables use of small MLCC output capacitors and compact 1 µH inductors. |
| Feedback Reference Voltage | 600 mV ±1% - sets precise output regulation point; allows 0.6 V to 0.84 × VIN output range via resistor divider. |
| Operating Modes | FCCM or automatic CCM/DCM - selectable via PS pin resistor; DCM operation reduces light-load quiescent current and improves efficiency below ~300 mA. |
| Protection Features | Integrated OVP/UVP/OCP/OTP/UVLO - eliminates need for external supervision ICs in space-constrained designs. |
| Power Good Output | Open-drain PGD with ±17% window and 400 µs delay - provides reliable system power sequencing and fault signaling. |
Pinout & Package
Package: 3 mm × 3 mm, 16-pin QFN (Case 485DA) with exposed thermal pad; RoHS-compliant, Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable control input | Active-high logic input with internal 1.35 MΩ pull-up; asserts internal soft-start and gate drivers when high. |
| 2 - NC | No-connect terminal | Internally unconnected; must be left floating or tied to GND per layout guidelines. |
| 3 - PGD | Power-good open-drain output | Signals valid output regulation (FB within ±17%); sinks up to 5 mA; de-asserts on fault or EN low. |
| 4 - BST | Bootstrap supply for high-side gate driver | Requires external 0.1 µF ceramic capacitor to SW node; enables full enhancement of integrated high-side MOSFET. |
| 5–7 - SWN | Switch node | Common drain connection of internal high- and low-side MOSFETs; carries high di/dt switching current. |
| 8 - PS | Mode selection input | Configures operation mode: grounded = FCCM; 24.3 kΩ to GND = auto CCM/DCM; other values enable alternate DCM thresholds. |
| 9 - COMP | Error amplifier output | Connects to external RC compensation network; sets loop stability and transient response characteristics. |
| 10 - FB | Voltage feedback input | Monitors output via resistor divider; compares against 600 mV reference to regulate output voltage. |
| 11 - AGND | Analog ground reference | Separate ground return for sensitive analog circuitry (error amp, reference, comparators); must tie to PGND at single point. |
| 12 - VDD | Internal bias supply input | Powered internally from VIN; may be shorted to VIN externally to reduce dropout loss. |
| 13–14 - VIN | Main power input | Supplies both power stage and gate drivers; requires local 10 µF ceramic decoupling close to pins. |
| 15–16 - PGND | Power ground return | High-current return path for MOSFETs and inductor; connects to exposed thermal pad for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual MOSFET power stage | Eliminates external high- and low-side switches, reducing BOM count and PCB area while ensuring matched timing and RDS(on) optimization. |
| Pre-bias startup support | Allows safe start-up into pre-charged output capacitors without reverse current flow or latch-up, critical for hot-swap and multi-rail sequencing applications. |
| Automatic CCM/DCM mode | Reduces light-load switching frequency and gate drive losses, achieving >90% efficiency at 100 mA output while maintaining fast transient recovery. |
| Output discharge function | Internally discharges output capacitor via SW node when EN is low or fault occurs, preventing residual voltage from interfering with downstream logic states. |
| MLCC-compatible design | Stable with low-ESR ceramic output capacitors (no electrolytic required), enabling smaller footprint and longer lifetime in industrial and automotive environments. |
Applications
| DDR Memory Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Providing tightly regulated 1.2 V or 1.5 V to DDR3/DDR4 memory banks in programmable logic controllers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering up to 6.5 A peak current with <400 µs power-good assertion for memory initialization sequence. Use Value: Pre-bias startup prevents data corruption during hot-insertion of memory modules; automatic CCM/DCM maintains >88% efficiency across 10 mA–6 A load range. | Use Scenario: Generating 3.3 V rail for microcontroller, CAN transceiver, and analog sensor interface in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Main 5 V-to-3.3 V conversion stage with integrated protections to withstand industrial voltage transients and temperature extremes. Use Value: Built-in OVP/UVP/OTP eliminates need for external supervisor IC; 125 °C ambient rating ensures reliability in enclosed enclosures without forced air cooling. |
| USB-Powered Edge AI Sensor Hub | Automotive Infotainment Core Rail |
Use Scenario: Stepping down 5 V USB power to 1.8 V for vision processor and neural network accelerator in portable edge devices. IC Role / Device Role / Timing Role: High-efficiency, low-noise core supply with FCCM mode selected for EMI-controlled environments and consistent transient response. Use Value: 1.1 MHz fixed frequency simplifies EMI filtering; 600 mV reference enables precise 1.8 V output with <±1% tolerance over temperature and line variation. | Use Scenario: Delivering stable 3.3 V to infotainment SoC cores in automotive head units where input may dip to 2.9 V during cold-crank. IC Role / Device Role / Timing Role: Input-robust buck converter supporting wide 2.9–5.5 V range and UVLO with 110 mV hysteresis to prevent brownout oscillation. Use Value: Thermal shutdown at 130–150 °C protects against under-hood thermal stress; RoHS/Pb-free compliance meets automotive material requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 4 A rated, 2.5–5.5 V input, 1.2 MHz, no automatic CCM/DCM; uses current-mode control. | Lacks pre-bias startup and output discharge; lower current rating limits use in high-power DDR or SoC rails. | Select when cost-sensitive, lower-current (<4 A) applications prioritize simplicity over advanced protection features. |
| TPS54332DR | 3 A rated, 3.5–28 V input, 600 kHz, external MOSFETs required; includes soft-start adjustability. | Wider input range but higher minimum input (3.5 V); requires external FETs and compensation components. | Select when input exceeds 5.5 V or when design flexibility with discrete power stage outweighs integration benefits. |
Compared with MP2315DJ-LF-Z and TPS54332DR, the NCP3136MNTXG delivers higher output current (6.5 A), wider low-end input capability (2.9 V), and richer integrated protection - making it optimal for space-constrained, high-reliability 3.3 V/5 V step-down applications where board area and BOM count are critical.
Availability
NCP3136MNTXG is available at Aetrix Electronics and suitable for DDR memory power supplies, industrial PLC I/O modules, USB-powered edge AI sensor hubs, and automotive infotainment core rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for NCP3136MNTXG 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The NCP3136MNTXG belongs to onsemi's integrated DC-DC converter product line, designed specifically for high-density, high-efficiency point-of-load regulation in space-constrained embedded systems requiring minimal external components and robust fault handling.
FAQ
What is the maximum output current capability of the NCP3136MNTXG?
The NCP3136MNTXG delivers up to 6.5 A instantaneous output current under typical conditions (VIN = 3.3 V, VOUT = 1.5 V, 1 µH inductor, 1.1 MHz). Its overcurrent protection threshold is specified at 7.6–8.8 A, with hiccup-mode fault recovery. Continuous DC output current depends on thermal design and PCB layout, but 6 A is sustainable with proper heatsinking via the exposed thermal pad.
Does the NCP3136MNTXG support pre-bias startup, and how does it work?
Yes, the NCP3136MNTXG supports pre-bias startup. When the output capacitor is pre-charged, the device holds the low-side MOSFET off until the internal soft-start ramp reaches the FB pin voltage, preventing reverse current flow and potential damage to downstream loads. This behavior is confirmed in the datasheet's Detailed Description section and validated in application testing with pre-biased outputs up to 90% of regulation voltage.
How is the switching mode (FCCM vs. automatic CCM/DCM) selected on the NCP3136MNTXG?
Switching mode is selected via the PS pin: connecting PS to GND forces FCCM; leaving PS floating or pulling it high also forces FCCM; connecting PS to GND through 24.3 kΩ, 57.6 kΩ, 105 kΩ, or 174 kΩ resistors enables automatic CCM/DCM operation with different light-load efficiency trade-offs. The resistor value determines the zero-crossing detection threshold and thus the DCM entry point.
What protection features are integrated into the NCP3136MNTXG?
The NCP3136MNTXG integrates overvoltage protection (OVP), undervoltage protection (UVP), overcurrent protection (OCP), thermal shutdown (OTP), and input under-voltage lockout (UVLO). OVP and UVP trigger after blanking times (1.5 µs and 11 µs respectively); OCP uses cycle-by-cycle limiting with hiccup recovery; OTP activates at 130–150 °C with 40 °C hysteresis; UVLO has 2.8 V trip and 110 mV hysteresis - all confirmed in the Electrical Characteristics and Protections sections of the datasheet.
Can the NCP3136MNTXG operate with ceramic (MLCC) output capacitors only?
Yes, the NCP3136MNTXG is explicitly designed to be stable with low-ESR MLCC output capacitors - a key feature highlighted in the datasheet's Features list and validated in Typical Characteristics plots. No electrolytic or tantalum capacitors are required; recommended output capacitance is ≥22 µF total using X5R/X7R ceramics placed close to the IC for optimal transient response and EMI performance.
NCP3136MNTXG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- 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):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6.5V
- Current - Output:
- 6A
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
NCP3136MNTXG FAQ
1.How can I place an order for NCP3136MNTXG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP3136MNTXG 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 NCP3136MNTXG reliable?
The price and inventory of NCP3136MNTXG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3136MNTXG is usually 5 days.
3.What payment methods are accepted for NCP3136MNTXG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3136MNTXG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP3136MNTXG?
NCP3136MNTXG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP3136MNTXG 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 NCP3136MNTXG?
For technical support, including NCP3136MNTXG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3136MNTXG requirements.
6.How does Aetrix verify that NCP3136MNTXG is sourced from the original manufacturer or authorized distributors?
All NCP3136MNTXG 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 NCP3136MNTXG meets industry standards.
7.What is the process for return or replacement of NCP3136MNTXG?
All NCP3136MNTXG units undergo pre-shipment inspection (PSI). If there is an issue with NCP3136MNTXG, 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 NCP3136MNTXG part is unused and in its original packaging.
Return procedure for NCP3136MNTXG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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