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onsemi NCP1511FCT1G
- Part No.:
- NCP1511FCT1G
- Manufacturer:
- onsemi
- Package:
- -
- Datasheet:
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NCP1511FCT1G.pdf
- Description:
- IC REG LINEAR SWITCHING REG
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Inventory:12,000
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Product details
Overview
NCP1511FCT1G from onsemi is a monolithic synchronous step-down DC-DC converter optimized for portable battery-powered systems, delivering up to 500 mA output current from 2.5–5.2 V input. It supports four digitally programmable output voltages (1.0 V, 1.3 V, 1.5 V, 1.89 V), operates in both PWM (up to 1.2 MHz) and pulsed switching modes, and integrates soft-start, cycle-by-cycle current limiting, and thermal shutdown - enabling high-efficiency power conversion in space-constrained cellular phones and digital cameras.
For engineers reviewing the NCP1511FCT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its 9-pin micro bump chip-scale package, dual-mode operation (PWM/pulsed), 14 µA quiescent current in pulsed mode, ±5% output voltage accuracy across all four settings, and compatibility with ceramic input/output capacitors for minimal BOM count.
Technical Context
The NCP1511FCT1G employs current-mode PWM control with integrated compensation, enabling stable regulation without external loop components. Its synchronous rectification eliminates the need for an external Schottky diode, reducing conduction loss and improving efficiency up to 93% at 150 mA (1.89 V out, 3.6 V in).
Mode selection is determined by the SYNC pin: logic low enables pulsed mode (<30 mA load), while logic high or external 500–1000 kHz clock enables fixed-frequency PWM mode. Output voltage is set via CB0/CB1 logic states, with internal pull-up (CB1) and pull-down (CB0) resistors ensuring default 1.3 V operation when floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 500 mA at Vin = 3.6 V - sufficient for baseband processors and camera ISPs in handheld devices. |
| Input Voltage Range | 2.5 V to 5.2 V - supports single-cell Li-ion (2.7–4.2 V) and triple-cell alkaline/NiMH (3.6–4.5 V) batteries. |
| Output Voltages | 1.0 V / 1.3 V / 1.5 V / 1.89 V - digitally selectable via CB0/CB1 pins for dynamic core voltage scaling. |
| Quiescent Current | 14 µA in pulsed mode - extends battery life during standby or light-load operation in portable equipment. |
| Switching Frequency | Internally 700–1200 kHz; externally synchronizable 500–1000 kHz - enables use of compact 6.8 µH inductors and low-profile ceramics. |
| Efficiency | 93% at 150 mA (1.89 V out, 3.6 V in) - achieved via synchronous FETs and optimized gate drive timing. |
| Protection Features | Thermal shutdown (160°C trip), cycle-by-cycle current limit (800 mA PWM / 200 mA pulsed), overvoltage protection (5% threshold). |
Pinout & Package
The NCP1511FCT1G is housed in a 9-pin micro bump chip-scale package (Case 499AC), measuring 1.55 mm × 1.55 mm × 0.6 mm with solder bumps on bottom-side terminals. This Pb-free, MSL Level 1 package enables ultra-compact PCB layouts for portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1: GNDP | Power Ground | Return path for high-current power stage (Q1/Q2); must be connected to dedicated ground plane region near LX. |
| A2: LX | Analog Output | Switch node connecting internal P-FET/N-FET to inductor; requires short, low-inductance trace to minimize ringing. |
| A3: VCC | Analog Input | Main power supply input (2.5–5.2 V); bypassed with 10 µF ceramic capacitor placed adjacent to pin. |
| B1: SYNC | Analog Input | Mode control/synchronization input; internal pull-down enables pulsed mode when floating or grounded. |
| B2: GNDA | Analog Ground | Reference ground for FB, SHD, CB0, CB1, and SYNC; star-connected separately from GNDP to avoid noise coupling. |
| B3: FB | Analog Input | Resistive feedback input for output voltage regulation; connected to resistor divider from Vout. |
| C1: SHD | Analog Input | Active-high enable; internal pull-down ensures safe disable if left unconnected. |
| C2: CB1 | Analog Input | Voltage select bit (MSB); internal pull-up sets default high state for 1.3 V/1.5 V/1.89 V options. |
| C3: CB0 | Analog Input | Voltage select bit (LSB); internal pull-down sets default low state for 1.0 V/1.3 V/1.5 V options. |
Key Features
| Feature | Design Value |
|---|---|
| Dual operating modes | PWM (fixed frequency, high load) and pulsed switching (variable frequency, <30 mA) - automatically adapts to load for peak efficiency across full range. |
| Integrated soft-start | Gradually ramps reference voltage at startup - limits inrush current into output capacitor and prevents system brown-out. |
| Synchronous rectification | Internal N-FET replaces external Schottky diode - reduces conduction loss and improves efficiency by ~5–8% vs. asynchronous designs. |
| Digital voltage selection | Four precise output levels (1.0/1.3/1.5/1.89 V) set via two logic inputs - enables software-controlled DVFS in baseband processors and SoCs. |
| Robust protection suite | Cycle-by-cycle current limit (800 mA PWM), thermal shutdown (160°C), and overvoltage protection (5%) - ensures reliable operation under fault conditions. |
Applications
| Cellular Baseband Power | Digital Camera ISP Supply |
|---|---|
Use Scenario: Powering ARM-based baseband processor in GSM/UMTS smartphones with dynamic voltage/frequency scaling requirements. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.3 V or 1.5 V core voltage, dynamically reconfigured via CB0/CB1 under firmware control. Use Value: Enables >20% battery life extension versus fixed-output converters by matching voltage precisely to processing load. | Use Scenario: Supplying image signal processor (ISP) in compact digital still cameras requiring low-noise, tightly regulated 1.89 V rail. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter operating in PWM mode at 1 MHz to minimize EMI near sensitive analog imaging circuitry. Use Value: Delivers 92% efficiency at 300 mA with <10 mVpp ripple using only 22 µF ceramic output capacitor - eliminates need for LC filtering. |
| MP3 Player Audio Codec | DSL Modem PHY Interface |
Use Scenario: Generating 1.0 V analog supply for stereo audio codec in portable MP3 players powered by single Li-ion cell. IC Role / Device Role / Timing Role: Low-quiescent-current buck converter in pulsed mode during playback pause or standby, dropping to 14 µA Iq. Use Value: Extends idle time to >100 hours on 800 mAh battery by minimizing no-load power loss without sacrificing transient response. | Use Scenario: Providing stable 1.5 V supply to DSL line driver PHY in residential broadband modems with variable thermal environment. IC Role / Device Role / Timing Role: Synchronous buck converter with thermal shutdown (160°C) and wide input range (2.5–5.2 V) to tolerate AC adapter ripple and ambient temperature swings. Use Value: Maintains regulation across −30°C to +85°C ambient with ±1.5% total output error - eliminates need for external voltage monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYT | 3-MHz fixed-frequency PWM; 300-mA output; 1.8–6.5-V input; no pulsed mode; different pinout. | Better suited for higher-frequency, lower-current applications where size is critical but light-load efficiency is secondary. | Select TPS62231DRYT when board space is constrained and 3-MHz operation simplifies EMI filtering - not drop-in compatible with NCP1511FCT1G. |
| RT8059NGSP | 2-MHz PWM-only; 600-mA output; 2.5–5.5-V input; integrated MOSFETs; no digital voltage selection pins. | Designed for fixed-output applications; lacks CB0/CB1 programmability and pulsed mode, requiring external resistors for feedback. | Choose RT8059NGSP for cost-sensitive designs needing higher current and simpler configuration - requires PCB layout changes and firmware adaptation. |
Compared with TPS62231DRYT and RT8059NGSP, the NCP1511FCT1G uniquely combines digital voltage selection, dual-mode operation (PWM/pulsed), and chip-scale packaging - making it optimal for battery-powered devices requiring adaptive power management and minimal footprint.
Availability
NCP1511FCT1G is available at Aetrix Electronics and suitable for cellular phone power management, digital camera ISP supplies, MP3 player audio codecs, DSL modem PHY interfaces, and portable medical monitors requiring stable component supply and long-term lifecycle support.
Supply support for NCP1511FCT1G 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 manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and portable electronics.
The NCP1511FCT1G belongs to onsemi's high-efficiency DC-DC converter product line, designed specifically for space-constrained, battery-powered portable devices requiring programmable output voltage and ultra-low quiescent current.
FAQ
What is the recommended input capacitor for NCP1511FCT1G?
A 10 µF X5R ceramic capacitor rated for ≥6.3 V is recommended and must be placed adjacent to the VCC pin. This value is validated for stable operation across the 2.5–5.2 V input range and suppresses high-frequency switching noise generated by the internal synchronous FETs in the NCP1511FCT1G.
How does the NCP1511FCT1G select its output voltage?
The NCP1511FCT1G selects output voltage via logic states on CB0 and CB1 pins: 1.0 V (CB0=L, CB1=L), 1.3 V (CB0=L, CB1=H), 1.5 V (CB0=H, CB1=H), 1.89 V (CB0=H, CB1=L). Internal pull-up (CB1) and pull-down (CB0) resistors ensure default 1.3 V operation when pins are unconnected.
What protection features does the NCP1511FCT1G include?
The NCP1511FCT1G includes cycle-by-cycle current limiting (800 mA in PWM mode), thermal shutdown (160°C trip, 135°C restart), overvoltage protection (5% above nominal), and soft-start. These features are fully integrated and require no external components to function - enhancing reliability in the NCP1511FCT1G.
Can the NCP1511FCT1G synchronize to an external clock?
Yes - the NCP1511FCT1G accepts a 500–1000 kHz square-wave clock on the SYNC pin to synchronize switching frequency. The rising edge triggers each PWM cycle, enabling EMI reduction and system-level timing coordination without modifying the NCP1511FCT1G's internal oscillator.
What is the shutdown current of the NCP1511FCT1G?
The NCP1511FCT1G draws just 0.1 µA typical shutdown current when the SHD pin voltage falls below 0.4 V. This ultra-low off-state leakage preserves battery charge in always-on portable devices and is verified across the full −30°C to +85°C operating temperature range of the NCP1511FCT1G.
NCP1511FCT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
NCP1511FCT1G FAQ
1.How can I place an order for NCP1511FCT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1511FCT1G 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 NCP1511FCT1G reliable?
The price and inventory of NCP1511FCT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1511FCT1G is usually 5 days.
3.What payment methods are accepted for NCP1511FCT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1511FCT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1511FCT1G?
NCP1511FCT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1511FCT1G 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 NCP1511FCT1G?
For technical support, including NCP1511FCT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1511FCT1G requirements.
6.How does Aetrix verify that NCP1511FCT1G is sourced from the original manufacturer or authorized distributors?
All NCP1511FCT1G 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 NCP1511FCT1G meets industry standards.
7.What is the process for return or replacement of NCP1511FCT1G?
All NCP1511FCT1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1511FCT1G, 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 NCP1511FCT1G part is unused and in its original packaging.
Return procedure for NCP1511FCT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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