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onsemi NCP1596AMNTWG
- Part No.:
- NCP1596AMNTWG
- Manufacturer:
- onsemi
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
NCP1596AMNTWG.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,342
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Product details
Overview
NCP1596AMNTWG from onsemi is a current-mode PWM buck DC-DC converter with integrated 1.5 A P-channel MOSFET switch, operating at 1.5 MHz switching frequency, delivering up to 1.5 A output current with ±1.5% reference voltage accuracy and 20 mV typical output ripple - used in USB power delivery and hard disk drive power rails.
For engineers reviewing the NCP1596AMNTWG datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage range (4.0–5.5 V), internal compensation, thermal shutdown with 30°C hysteresis, PFM/PWM auto-switchover, and DFN6 3×3 mm package compatibility with ceramic output capacitors.
Technical Context
The NCP1596AMNTWG implements fixed-frequency current-mode control with slope compensation to ensure stability above 50% duty cycle. It integrates an error amplifier with internal 0.8 V feedback reference, cycle-by-cycle overcurrent protection, and a 1 ms digital soft-start circuit that limits inrush current during startup.
Its architecture supports both continuous conduction mode (CCM) and discontinuous conduction mode (DCM), automatically transitioning to PFM at light load to maintain >50% efficiency down to 10 mA. The device features separate VCC (IC bias) and VCCP (power switch supply) pins for optimized gate drive and low quiescent current (500 nA in shutdown).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.5 MHz typical; enables use of small 3.3 µH inductors and 22 µF ceramic output capacitors, reducing board area. |
| Output Current | 1.5 A max; supported by internal P-FET with 0.2 Ω typical RDS(on) at 5 V input, minimizing conduction loss. |
| Feedback Voltage | 0.800 V ±12 mV; sets precise output regulation via external resistor divider, enabling adjustable VOUT from 0.8 V to 0.9×VIN. |
| UVLO Threshold | 3.5 V ±0.3 V; prevents erratic operation during brown-out; 180 mV hysteresis ensures clean restart after recovery. |
| Thermal Shutdown | 160°C activation with 30°C hysteresis; protects die during overload or poor heatsinking; resumes operation only after junction cools to ≤130°C. |
| Efficiency | Up to 90% at 1 A/3.3 V; 75% at 1.2 V; achieved via PFM mode at light load and low RDS(on) switch. |
| Soft-Start Time | 1.0 ms typical; linear ramp prevents output overshoot and reduces stress on input capacitor and inductor. |
Pinout & Package
Package: DFN6 3×3 mm, 0.95 mm pitch, exposed thermal pad (Case 506AH), Pb-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Feedback input | Connects to resistor divider midpoint; senses output voltage; internal 0.8 V reference enables precise regulation without external compensation. |
| 2 - GND | Power and signal ground | Common return for IC logic, power switch, and feedback network; must be tied to low-impedance PCB ground plane. |
| 3 - LX | Switch node | Drives external inductor; carries high di/dt switching current; requires short, low-inductance trace to minimize EMI and voltage spikes. |
| 4 - VCCP | Power switch supply | Bias source for internal P-FET gate driver; decoupled separately from VCC to reduce noise coupling into control circuitry. |
| 5 - VCC | IC core supply | Powers internal oscillator, error amp, and logic; UVLO monitors this rail; requires local 1 µF ceramic bypass capacitor. |
| 6 - EN | Enable control | Active-high logic input; internal 500 nA pull-up allows no-connect enable; pulled below 0.4 V disables device and reduces ICC to 1 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external compensation components, simplifying design and improving noise immunity across 0.8–3.3 V output range. |
| PFM/PWM auto-switchover | Maintains >50% efficiency at 10 mA load while preserving low output ripple (<20 mV) in PWM mode at full load. |
| Digital soft-start | 1 ms fixed-duration ramp prevents inrush current, avoids input capacitor stress, and eliminates need for external timing components. |
| Thermal shutdown with hysteresis | 160°C trip + 30°C hysteresis prevents thermal cycling failure and ensures safe recovery without manual reset. |
| Separate VCC/VCCP rails | Isolates control logic supply from power switch supply, reducing cross-talk and enabling independent decoupling for stable operation. |
Applications
| Hard Disk Drive Power Supply | USB Peripheral Power Delivery |
|---|---|
Use Scenario: Regulating 5 V USB input to 1.2 V or 3.3 V for HDD controller ICs and spindle motor drivers in portable storage devices. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, low-noise core voltage with fast transient response to burst read/write loads. Use Value: 1.5 MHz switching enables compact 3.3 µH inductor and 22 µF ceramic output caps, meeting space-constrained HDD module requirements. | Use Scenario: Converting 5 V USB bus voltage to 3.3 V for Wi-Fi dongles, USB hubs, or external SSD enclosures with variable load profiles. IC Role / Device Role / Timing Role: Standalone DC-DC converter managing dynamic load steps (e.g., radio transmit bursts) while maintaining <±1.5% output regulation. Use Value: PFM mode sustains >50% efficiency at 10 mA idle current, extending battery life in bus-powered peripherals. |
| DSL/Modem Line Card | Embedded Industrial Sensor Node |
Use Scenario: Generating 1.8 V or 2.5 V for DSL PHY and microcontroller subsystems in residential gateways operating from 5 V wall adapter. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator supporting mixed-signal ICs with tight noise and ripple requirements. Use Value: 20 mV typical output ripple and ±1.5% reference accuracy meet analog front-end noise budgets without additional LDO post-regulation. | Use Scenario: Powering ultra-low-power MCU, RF transceiver, and analog sensor interface in battery-operated industrial monitoring nodes. IC Role / Device Role / Timing Role: Primary power converter enabling deep-sleep current as low as 1 µA in shutdown, activated via EN pin control. Use Value: Shutdown quiescent current of 1–3 µA preserves battery energy during extended sleep intervals between sensor readings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 2 A rating, 2 MHz switching, no integrated soft-start timer; requires external RC for soft-start. | Higher current capability but lacks built-in 1 ms digital soft-start; less suitable for systems requiring guaranteed inrush control. | Select when higher output current or faster transient response is prioritized over guaranteed soft-start simplicity. |
| TPS62130ARGTR | 3 A rating, 2.5 V–6 V input, 3.5 µA quiescent current in PFM; uses different pinout (EN on Pin 3, not Pin 6). | Lower IQ enables longer battery life in always-on sensors; non-pin-compatible layout change required. | Select for ultra-low-power battery applications where 3.5 µA PFM IQ outweighs re-layout effort. |
Compared with MP2315DJ-LF-Z and TPS62130ARGTR, the NCP1596AMNTWG offers deterministic 1 ms soft-start, tighter reference tolerance (±1.5%), and DFN6 pinout optimized for compact 3.3 µH inductor layouts - making it preferred for cost-sensitive, space-constrained USB and HDD power rails where predictable startup and minimal BOM count are critical.
Availability
NCP1596AMNTWG is available at Aetrix Electronics and suitable for USB peripheral power delivery, hard disk drive voltage regulation, and DSL modem line card designs requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP1596AMNTWG 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, and cloud infrastructure markets.
The NCP1596AMNTWG belongs to onsemi's NCP15xx family of integrated buck converters designed for high-efficiency, low-noise point-of-load regulation in space-constrained consumer and computing applications.
FAQ
What is the recommended input voltage range for reliable operation of the NCP1596AMNTWG?
The NCP1596AMNTWG operates reliably within an input voltage range of 4.0 V to 5.5 V. Its under-voltage lockout (UVLO) activates below 3.5 V (±0.3 V), preventing unstable behavior during brown-out conditions. Operation outside this range may cause improper regulation, thermal stress, or failure to start - always verify VIN remains within spec under worst-case load and line conditions when using NCP1596AMNTWG.
Does the NCP1596AMNTWG require external compensation components?
No, the NCP1596AMNTWG features fully internal compensation, eliminating the need for external capacitors or resistors in the feedback loop. This is confirmed in its datasheet Features section and Electrical Characteristics table, where "Fully Internal Compensation" is explicitly listed. Designers can implement stable regulation using only the FB pin and a two-resistor divider - simplifying layout and improving noise immunity for the NCP1596AMNTWG.
How does the NCP1596AMNTWG handle light-load efficiency optimization?
The NCP1596AMNTWG automatically switches from PWM to PFM mode under light load to maintain high efficiency - achieving >50% at 10 mA output. This transition reduces switching losses by lowering effective frequency while preserving regulation. The PFM mode is fully integrated and requires no external configuration; it is a core feature of the NCP1596AMNTWG's control architecture per its datasheet Section 10.
What thermal protection mechanisms are implemented in the NCP1596AMNTWG?
The NCP1596AMNTWG includes thermal shutdown with a 160°C activation threshold and 30°C hysteresis, ensuring the junction temperature never exceeds safe limits. When triggered, the internal P-FET switch disables completely; operation resumes only after die temperature falls to ≤130°C. This behavior is documented in the Absolute Maximum Ratings and Electrical Characteristics tables - a critical safeguard for the NCP1596AMNTWG in enclosed or high-ambient environments.
Can the NCP1596AMNTWG support 100% duty cycle operation, and why is that important?
Yes, the NCP1596AMNTWG supports 100% duty cycle operation, enabling output voltages approaching the input rail (VOUT ≤ 0.9 × VIN). This capability improves transient response during sudden load increases by eliminating dead time, allowing immediate full conduction. As stated in the Detailed Operating Description section, 100% duty cycle is a designed feature of the NCP1596AMNTWG to enhance system stability under dynamic loads.
NCP1596AMNTWG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (3x3)
NCP1596AMNTWG FAQ
1.How can I place an order for NCP1596AMNTWG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1596AMNTWG 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 NCP1596AMNTWG reliable?
The price and inventory of NCP1596AMNTWG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1596AMNTWG is usually 5 days.
3.What payment methods are accepted for NCP1596AMNTWG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1596AMNTWG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1596AMNTWG?
NCP1596AMNTWG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1596AMNTWG 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 NCP1596AMNTWG?
For technical support, including NCP1596AMNTWG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1596AMNTWG requirements.
6.How does Aetrix verify that NCP1596AMNTWG is sourced from the original manufacturer or authorized distributors?
All NCP1596AMNTWG 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 NCP1596AMNTWG meets industry standards.
7.What is the process for return or replacement of NCP1596AMNTWG?
All NCP1596AMNTWG units undergo pre-shipment inspection (PSI). If there is an issue with NCP1596AMNTWG, 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 NCP1596AMNTWG part is unused and in its original packaging.
Return procedure for NCP1596AMNTWG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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