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onsemi NCP500SN28T1
- Part No.:
- NCP500SN28T1
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP500SN28T1.pdf
- Description:
- IC REG LINEAR 2.8V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,932
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Product details
Overview
NCP500SN28T1 from onsemi is a fixed-output, low-noise, low-dropout linear regulator delivering 2.8 V at up to 150 mA. It features an ultra-low dropout voltage of 170 mV at full load, 50 µV RMS noise (10 Hz–100 kHz) without bypass capacitor, and fast 20 µs enable turn-on time. Designed for noise-sensitive RF and portable battery-powered systems, it operates from 1.8 V to 6.0 V input and supports ceramic output capacitors as small as 1.0 µF.
For engineers reviewing the NCP500SN28T1 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance at 150 mA, enable logic compatibility with 1.0 V microcontrollers, thermal shutdown behavior, and stability with low-ESR ceramic capacitors in space-constrained DFN 2×2.2 mm layouts.
Technical Context
The NCP500SN28T1 uses a PMOS pass transistor architecture enabling ultra-low dropout and eliminating the need for external noise-bypass capacitance. Its internal error amplifier maintains regulation across ±2.5% output voltage accuracy over −40 °C to +85 °C, while integrated current limit and thermal shutdown protect against fault conditions.
Enable functionality is implemented with a high-impedance input (3.0 nA typical bias current) and asymmetric thresholds: turn-on at ≥0.9 V and turn-off at ≤0.15 V, allowing direct interfacing with low-voltage logic. The device achieves 62 dB ripple rejection at 1 kHz and exhibits stable operation with 1.0 µF ceramic output capacitors regardless of ESR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.8 V ±2.5% (ensures stable supply for 2.8 V analog/RF ICs across temperature and load) |
| Max Output Current | 150 mA (supports moderate-power sensors, audio codecs, and MCU peripherals) |
| Dropout Voltage | 170 mV at 150 mA (enables operation down to 2.97 V input for single-cell Li-ion systems) |
| RMS Noise | 50 µV (10 Hz–100 kHz, no bypass cap required - critical for VCOs and RF front-ends) |
| Enable Threshold | 0.9 V logic-high / 0.15 V logic-low (direct interface with 1.0 V I/O domains) |
| Quiescent Current | 185 µA at 150 mA load (minimizes standby power in always-on portable devices) |
| Ripple Rejection | 62 dB at 1 kHz (suppresses switching noise from upstream DC-DC converters) |
Pinout & Package
Package: DFN 2×2.2 mm, 6-pin, exposed thermal pad (Case 506BA). Pin 6 is GND and shares thermal connection with the die paddle.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive input supply (1.8–6.0 V); requires local 1.0 µF decoupling |
| 2 | GND | Power ground reference; connects to PCB thermal pad for heat dissipation |
| 3 | Enable | Active-high digital control; <0.15 V disables regulator, ≥0.9 V enables |
| 4 | Vout | Regulated 2.8 V output; stable with 1.0 µF ceramic capacitor |
| 5 | N/C | No internal connection - must be left floating or grounded (not recommended) |
| 6 | GND | Dedicated ground terminal; ties to thermal pad and improves PSRR |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 170 mV @ 150 mA enables use with aging or partially discharged batteries |
| No external bypass capacitor | 50 µV RMS noise achieved via internal architecture - saves board area and BOM cost |
| Fast enable response | 20 µs turn-on time supports dynamic power sequencing in multi-rail systems |
| Low-voltage enable compatibility | Operates with 1.0 V logic - eliminates level-shifting for modern ultra-low-voltage MCUs |
| Thermal and current protection | Internal shutdown at ~160 °C and current limit >540 mA prevent damage during overload |
Applications
| RF Power Amplifier Biasing | VCO and PLL Supply |
|---|---|
Use Scenario: Providing clean, low-noise bias to GaAs or SiGe RF power amplifiers in cellular handsets and IoT transceivers. IC Role / Device Role / Timing Role: Low-dropout voltage regulator supplying stable 2.8 V rail with minimal phase noise contribution. Use Value: 50 µV RMS noise and 62 dB ripple rejection prevent AM-to-PM conversion and maintain EVM compliance. | Use Scenario: Powering voltage-controlled oscillators and phase-locked loop circuits in wireless sensor nodes and Bluetooth modules. IC Role / Device Role / Timing Role: Ultra-low-noise LDO delivering regulated 2.8 V to sensitive analog timing circuitry. Use Value: Eliminates need for external bypass capacitor, reducing layout sensitivity and improving frequency stability. |
| Portable Medical Sensors | Industrial Handheld Scanners |
Use Scenario: Supplying precision analog front-ends (AFE) in battery-operated pulse oximeters and glucose meters. IC Role / Device Role / Timing Role: Fixed-output LDO ensuring accurate ADC reference and signal chain bias under varying battery voltage. Use Value: 2.5% output accuracy and 170 mV dropout extend usable battery life while maintaining measurement integrity. | Use Scenario: Regulating power for image sensors and laser drivers in rugged barcode scanners and asset trackers. IC Role / Device Role / Timing Role: Enable-controlled LDO supporting rapid wake/sleep cycles and low-quiescent-power operation. Use Value: 185 µA quiescent current and 20 µs enable response reduce average system power by >30% in intermittent-use devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2802E/TT | 250 mV dropout at 150 mA; 30 µV RMS noise; SOT-23-5 package | Larger dropout limits use in low-Vin battery systems; smaller footprint but lower thermal performance | Select when board space is constrained and thermal load is light (<100 mW) |
| Torex XC6206P282MR-G | 200 mV dropout at 150 mA; 40 µV RMS noise; SOT-25 package; no enable pin | Fixed-on operation only; lacks enable control for power sequencing or sleep modes | Select for cost-sensitive, always-on applications where enable functionality is unnecessary |
Compared with MCP1700T-2802E/TT and XC6206P282MR-G, the NCP500SN28T1 offers superior dropout performance and integrated enable control in a thermally enhanced DFN package - making it optimal for compact, battery-powered RF and portable instrumentation designs requiring dynamic power management.
Availability
NCP500SN28T1 is available at Aetrix Electronics and suitable for RF front-end biasing, portable medical sensing, industrial handheld scanning, and low-power IoT node power management requiring stable component supply and long-term manufacturability.
Supply support for NCP500SN28T1 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP500 series is designed specifically for portable, battery-powered systems demanding ultra-low noise, fast enable response, and minimal external components - targeting RF, audio, and precision analog subsystems.
FAQ
What is the maximum input voltage rating for the NCP500SN28T1?
The NCP500SN28T1 has an absolute maximum input voltage of 6.0 V. Operation above this level risks permanent damage. For reliable long-term use, the recommended operating range is 1.8 V to 6.0 V, with optimal performance observed when Vin remains within 0.5 V to 1.0 V above the 2.8 V output - especially critical at full 150 mA load to maintain regulation.
Does the NCP500SN28T1 require an external bypass capacitor for noise reduction?
No, the NCP500SN28T1 does not require an external bypass capacitor. Its internal architecture delivers 50 µV RMS output noise (10 Hz–100 kHz) without one - a key differentiator from conventional LDOs. This simplifies layout, reduces BOM count, and avoids start-up delays associated with bypass capacitor charging.
Can the NCP500SN28T1 be used with ceramic output capacitors?
Yes, the NCP500SN28T1 is fully stable with ceramic output capacitors as small as 1.0 µF and exhibits no minimum ESR requirement. This enables use of low-profile, high-reliability MLCCs and eliminates the need for bulkier tantalum or aluminum electrolytic alternatives.
What is the thermal shutdown threshold of the NCP500SN28T1?
The NCP500SN28T1 incorporates internal thermal shutdown that activates at approximately 160 °C junction temperature. Once triggered, the regulator disables output until junction temperature falls below the hysteresis threshold (~140 °C), protecting against sustained overtemperature conditions during overload or poor PCB thermal design.
How does the enable pin of the NCP500SN28T1 behave under undervoltage conditions?
The NCP500SN28T1 enable pin has asymmetric thresholds: output turns on when enable voltage rises to ≥0.9 V and turns off when it falls to ≤0.15 V. This hysteresis prevents chatter during slow-rising or noisy enable signals. If unused, the enable pin must be tied to Vin - floating is not permitted.
NCP500SN28T1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.25V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 1 µA
- Current - Supply (Max):
- 300 µA
- PSRR:
- 62dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCP500SN28T1 FAQ
1.How can I place an order for NCP500SN28T1 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP500SN28T1 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 NCP500SN28T1 reliable?
The price and inventory of NCP500SN28T1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP500SN28T1 is usually 5 days.
3.What payment methods are accepted for NCP500SN28T1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP500SN28T1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP500SN28T1?
NCP500SN28T1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP500SN28T1 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 NCP500SN28T1?
For technical support, including NCP500SN28T1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP500SN28T1 requirements.
6.How does Aetrix verify that NCP500SN28T1 is sourced from the original manufacturer or authorized distributors?
All NCP500SN28T1 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 NCP500SN28T1 meets industry standards.
7.What is the process for return or replacement of NCP500SN28T1?
All NCP500SN28T1 units undergo pre-shipment inspection (PSI). If there is an issue with NCP500SN28T1, 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 NCP500SN28T1 part is unused and in its original packaging.
Return procedure for NCP500SN28T1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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