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onsemi NCP1508MNR2G
- Part No.:
- NCP1508MNR2G
- Manufacturer:
- onsemi
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- -
- Datasheet:
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NCP1508MNR2G.pdf
- Description:
- IC REG LINEAR SWITCHING REG
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Product details
Overview
NCP1508MNR2G from onsemi is a synchronous step-down DC-DC converter optimized for portable battery-powered systems, delivering up to 500 mA output at 1.0–1.89 V with 93% peak efficiency (1.89 V @ 3.6 VIN, 125 mA), 1 MHz switching frequency, and digital output voltage selection via CB0/CB1 pins. It operates from 2.7–5.2 V input and integrates soft-start, cycle-by-cycle current limiting, thermal shutdown, and mode control (PWM/pulsed) for cellular baseband processors and audio subsystems.
For engineers reviewing the NCP1508MNR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its 10-pin DFN package, programmable 1.0/1.3/1.5/1.89 V outputs, pulsed-mode quiescent current of 14 µA, 800 mA PWM current limit, and SYNC-controlled mode transition between high-efficiency PWM and ultra-low-power pulsed operation.
Technical Context
The NCP1508MNR2G employs current-mode PWM control with integrated compensation, enabling stable regulation across 2.7–5.2 V input and load steps up to 300 mA. Its dual-mode architecture-PWM (1 MHz nominal, sync-capable 500–1000 kHz) and pulsed mode (<30 mA)-is selected via the SYNC pin, with automatic transition based on load demand.
It integrates synchronous rectification using internal P-FET/N-FET switches (RDS(on) = 0.23 Ω typ), eliminating external diodes. Output voltage is digitally set by CB0/CB1 logic states, with factory-default 1.3 V when floating; feedback accuracy is ±50 mV for all four output options at 300 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 500 mA at VIN = 3.6 V - supports core power for baseband processors and DSPs in single-cell Li-ion systems. |
| Switching Frequency | 1 MHz nominal (700–1240 kHz over temp) - enables use of compact 6.8 µH inductors and low-profile ceramic capacitors. |
| Efficiency | 93% at 1.89 V/125 mA, 3.6 VIN - minimizes thermal rise and extends battery runtime in handheld devices. |
| Quiescent Current | 14 µA in pulsed mode - critical for maintaining >100-hour standby in always-on mobile peripherals. |
| Output Voltage Options | 1.0 V, 1.3 V, 1.5 V, 1.89 V - software-selectable via two logic inputs to match dynamic voltage scaling requirements. |
| Current Limit | 800 mA in PWM mode, 200 mA in pulsed mode - provides robust short-circuit protection while preserving light-load efficiency. |
| Operating Temp | −30°C to +85°C ambient - validated for consumer portable equipment including smartphones and digital cameras. |
Pinout & Package
Package: 3×3 mm, 10-pin DFN (Case 485C), exposed thermal pad, Pb-free (RoHS compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GNDA | Analog Ground | Reference ground for FB, REF, SYNC, CB0, CB1, SHD - must be star-connected separately from power ground to avoid noise coupling. |
| 2 GNDP | Power Ground | Return path for high-current P-FET/N-FET switching stage - connects directly to exposed thermal pad for thermal and EMI control. |
| 3 LX | Switch Node | Drain connection of internal P-FET and source of N-FET - drives external inductor; requires low-inductance layout to minimize ringing. |
| 4 VCCP | P-FET Supply | Input supply for high-side P-channel switch - decoupled with local 10 µF ceramic capacitor near pin. |
| 5 VCC | Analog & Control Supply | Main IC bias rail for error amplifier, oscillator, and logic - shares input cap with VCCP but routed separately. |
| 6 FB | Feedback Input | Resistive divider input referenced to 1.25 V internal bandgap - sets output voltage with ±50 mV accuracy across temperature and load. |
| 7 CB0 | Output Select LSB | Digital input with internal pulldown - combined with CB1 determines one of four output voltages per truth table. |
| 8 CB1 | Output Select MSB | Digital input with internal pullup - floating default yields 1.3 V output; no external pull required. |
| 9 SHD | Enable/Shutdown | Active-high enable with internal pulldown - <0.4 V disables IC, reducing current to 0.1 µA typical; >1.2 V enables soft-start sequence. |
| 10 SYNC | Mode Control & Sync | Three-state input: LOW = pulsed mode; HIGH = internal 1 MHz PWM; external clock = synchronized PWM - controls operating mode and eliminates beat frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectification | Integrated P-FET/N-FET switches eliminate external Schottky diode, reducing conduction loss and board area in space-constrained portable designs. |
| Dual-Mode Operation | Automatic transition between PWM (high-load) and pulsed (light-load) modes via SYNC pin - maintains >85% efficiency from 5 mA to 500 mA output. |
| Digital Output Selection | Four precise output voltages (1.0/1.3/1.5/1.89 V) set by two logic pins - enables dynamic voltage scaling without external DAC or I²C interface. |
| Integrated Protection | Cycle-by-cycle current limiting (800 mA PWM / 200 mA PM), thermal shutdown (>160°C), and overvoltage protection (5% above setpoint) - ensures robustness in unregulated battery systems. |
| Fixed Compensation | Internal loop compensation eliminates external RC network - simplifies design, reduces BOM count, and guarantees stability with recommended 6.8 µH inductor and 22 µF output capacitor. |
Applications
| Smartphone Baseband Power | Digital Camera Image Sensor Bias |
|---|---|
Use Scenario: Powers ARM-based application processor cores requiring dynamically scaled voltage (1.0–1.3 V) during active and idle states in LTE smartphones. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core voltage with fast transient response to CPU load changes. Use Value: Extends talk time by 18% vs. non-synchronous alternatives due to 93% peak efficiency and 14 µA pulsed-mode quiescent current. | Use Scenario: Supplies clean, low-noise 1.5 V bias to CMOS image sensor analog front-end in compact digital still cameras. IC Role / Device Role / Timing Role: High-PSRR step-down converter with tight load regulation (±15 mV) and low 5 mVPP line transient response. Use Value: Reduces image fixed-pattern noise by maintaining output voltage stability within ±0.5% during flash LED current surges. |
| Wireless Modem RF SoC Core | Portable Audio Codec Supply |
Use Scenario: Provides 1.89 V core voltage to QAM/OFDM modem SoCs in DSL/wireless CPE units operating from 3.6 V Li-ion packs. IC Role / Device Role / Timing Role: Synchronized PWM regulator locked to system clock (600–1000 kHz) to suppress switching noise in adjacent RF receive bands. Use Value: Enables 20 dB reduction in conducted EMI at 900 MHz by eliminating beat frequencies between internal oscillator and RF carrier. | Use Scenario: Generates 1.3 V analog supply for stereo audio codecs in MP3 players, where low ripple prevents audible hiss in headphone output. IC Role / Device Role / Timing Role: Low-ESR-output buck converter with <22 mV ripple at 300 mA - uses 22 µF X5R ceramic capacitor per datasheet recommendation. Use Value: Achieves SNR >102 dB by limiting output ripple to <0.002% of nominal voltage, meeting high-fidelity audio 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 |
|---|---|---|---|
| TPS62231DRYR | 3 MHz fixed-frequency PWM, 300 mA max output, 2.05 V–6.5 V input range - higher switching frequency enables smaller magnetics but lower current capability. | Targeted at ultra-compact wearables with strict size constraints; lacks pulsed mode, resulting in higher light-load quiescent current (22 µA vs. 14 µA). | Select when board area is primary constraint and load rarely drops below 50 mA. |
| RT8059ZSP | 2.5 MHz operation, 600 mA output, 2.5 V–5.5 V input - includes I²C interface for voltage programming but requires external compensation components. | Designed for systems needing >4 voltage options or remote configuration; adds firmware overhead and PCB routing complexity. | Select when dynamic reconfiguration via host processor is required and layout space allows for compensation network. |
Compared with TPS62231DRYR and RT8059ZSP, the NCP1508MNR2G offers superior light-load efficiency via hardware-controlled pulsed mode, fixed internal compensation for rapid deployment, and proven 500 mA capability in 3×3 mm DFN - making it optimal for cost-sensitive, battery-life-critical portable designs without communication interfaces.
Availability
NCP1508MNR2G is available at Aetrix Electronics and suitable for smartphone baseband power, digital camera sensor bias, wireless modem RF SoC core, portable audio codec supply, and DSL modem applications requiring stable component supply across production lifecycles.
Supply support for NCP1508MNR2G 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and portable markets.
The NCP1508MNR2G belongs to onsemi's high-efficiency DC-DC converter product line, engineered specifically for space- and battery-constrained portable electronics requiring programmable output voltage, ultra-low quiescent current, and robust protection in minimal footprint.
FAQ
What is the maximum output current capability of the NCP1508MNR2G?
The NCP1508MNR2G delivers up to 500 mA output current when supplied from 3.6 V input, as verified under continuous conduction mode with 6.8 µH inductor and 22 µF output capacitor. This rating assumes ambient temperature ≤85°C and proper thermal management via the exposed DFN pad. At higher input voltages (e.g., 5.2 V), current is limited by internal 800 mA cycle-by-cycle protection in PWM mode.
How does the NCP1508MNR2G select its output voltage?
The NCP1508MNR2G selects one of four output voltages (1.0 V, 1.3 V, 1.5 V, or 1.89 V) using the logic states of CB0 and CB1 pins, per the documented truth table. CB0 has an internal pulldown resistor and CB1 an internal pullup, so floating defaults to 1.3 V. No external resistors or I²C commands are needed - voltage selection is purely digital and static during operation.
Can the NCP1508MNR2G synchronize to an external clock?
Yes, the NCP1508MNR2G accepts external synchronization signals from 500 kHz to 1000 kHz applied to the SYNC pin. The device triggers switching on the rising edge of the input clock and operates in PWM mode with matched frequency. This feature suppresses beat frequencies in multi-rail systems and aligns switching noise away from sensitive RF bands, as confirmed in the Electrical Characteristics table and Figure 9.
What protection features are integrated into the NCP1508MNR2G?
The NCP1508MNR2G integrates cycle-by-cycle current limiting (800 mA in PWM, 200 mA in pulsed mode), thermal shutdown (activates at >160°C junction, restarts at <135°C), overvoltage protection (5% above setpoint), and soft-start (1.5 ms ramp). These functions are fully internal - no external components are required to enable any of these protections, as detailed in the Operating Description section.
What is the quiescent current of the NCP1508MNR2G in shutdown mode?
In shutdown mode - activated when SHD pin voltage falls below 0.4 V - the NCP1508MNR2G draws only 0.1 µA typical (1.0 µA maximum) supply current, as specified in the Electrical Characteristics table. This ultra-low shutdown current preserves battery charge during extended storage or system sleep states, and the device resumes normal operation with soft-start upon SHD voltage exceeding 1.2 V.
NCP1508MNR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
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- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
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- Topology:
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- Output Type:
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- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
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NCP1508MNR2G FAQ
1.How can I place an order for NCP1508MNR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1508MNR2G 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 NCP1508MNR2G reliable?
The price and inventory of NCP1508MNR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1508MNR2G is usually 5 days.
3.What payment methods are accepted for NCP1508MNR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1508MNR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1508MNR2G?
NCP1508MNR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1508MNR2G 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 NCP1508MNR2G?
For technical support, including NCP1508MNR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1508MNR2G requirements.
6.How does Aetrix verify that NCP1508MNR2G is sourced from the original manufacturer or authorized distributors?
All NCP1508MNR2G 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 NCP1508MNR2G meets industry standards.
7.What is the process for return or replacement of NCP1508MNR2G?
All NCP1508MNR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1508MNR2G, 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 NCP1508MNR2G part is unused and in its original packaging.
Return procedure for NCP1508MNR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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