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onsemi NCP105AMX280TCG
- Part No.:
- NCP105AMX280TCG
- Manufacturer:
- onsemi
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
NCP105AMX280TCG.pdf
- Description:
- IC REG LINEAR 2.8V 150MA 4XDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,056
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Product details
Overview
NCP105AMX280TCG from onsemi is a 150 mA low-dropout linear regulator with fixed 2.8 V output, optimized for battery-powered portable electronics. It delivers ±1% output accuracy at room temperature, 125 mV typical dropout at 150 mA, and 70 dB PSRR at 1 kHz - enabling stable, low-noise power delivery in space-constrained, noise-sensitive applications such as smartphone baseband processors.
For engineers reviewing the NCP105AMX280TCG datasheet, pinout, applications, or equivalent options, key selection criteria include quiescent current (50 µA typ), active output discharge capability, soft-start slew-rate control (normal speed variant), thermal shutdown (160°C), and compatibility with 1 µF ceramic output capacitors.
Technical Context
The NCP105AMX280TCG employs a PMOS pass transistor architecture with dynamic quiescent current adjustment to minimize IQ during light/no-load conditions. Its internal bandgap reference, active discharge circuit (enabled in A/C variants), and thermal shutdown logic operate independently of external components.
It integrates line/load regulation compensation and features two programmable VOUT slew rates - this specific variant (A-series) uses the normal-speed ramp (190 mV/s), distinguishing it from C/D variants with slower 20 mV/s startup - ensuring controlled power-up for sensitive analog or imaging subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±1% at room temperature - ensures precise biasing for RF front-ends and ADC references without external feedback. |
| Max Output Current | 150 mA continuous - supports moderate-power microcontrollers, sensors, and wireless transceivers in compact handheld devices. |
| Dropout Voltage | 125 mV typical at 150 mA - enables operation from single-cell Li-ion (3.0 V min) or dual-cell alkaline sources with minimal headroom loss. |
| Quiescent Current | 50 µA typical at no load - extends battery life in always-on sensor nodes and standby modes of mobile platforms. |
| PSRR | 70 dB at 1 kHz - suppresses switching noise from DC/DC converters feeding the LDO input, critical for audio and RF signal chains. |
| Enable Threshold | 0.9 V high / 0.4 V low - compatible with standard GPIO logic levels and allows clean sequencing with host processors. |
| Thermal Shutdown | 160°C activation with 20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
Package: XDFN4 (1.0 mm × 1.0 mm, 0.65 mm pitch), Case 711AJ - ultra-compact footprint suitable for high-density mobile PCBs; exposed pad must be soldered directly to GND plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Regulated output voltage node | Connects to 1 µF ceramic capacitor to GND; minimum 0.47 µF effective capacitance required for stability across temp/bias. |
| 2: GND | Power ground reference | Primary return path for load current and IC bias; exposed pad must be tied directly to this pin via low-impedance copper pour. |
| 3: EN | Enable control input | Logic-high (>0.9 V) enables regulation; logic-low (<0.4 V) disables output and activates 100 Ω active discharge to GND. |
| 4: IN | Input supply connection | Accepts 1.7–5.5 V input; requires local 1 µF ceramic capacitor to suppress high-frequency noise and trace inductance effects. |
Key Features
| Feature | Design Value |
|---|---|
| Active Output Discharge | 100 Ω pull-down path to GND when disabled - prevents floating outputs and ensures rapid VOUT decay for system-level power sequencing. |
| Soft-Start (Normal Slew Rate) | 190 mV/s VOUT ramp-up - avoids inrush current spikes and stabilizes downstream clock domains during power-on. |
| Stability with Small Capacitors | Guaranteed stable with ≥1 µF X5R/X7R ceramic COUT - eliminates need for larger, higher-ESR tantalum or electrolytic capacitors. |
| Low-IQ Dynamic Adjustment | 50 µA typ IQ at no load, rising only with output current - preserves battery runtime in intermittent-sensing applications. |
| Robust Protection Suite | Integrated current limit (600 mA typ), thermal shutdown (160°C), and reverse-current blocking - reduces need for external protection components. |
Applications
| Smartphone Baseband Power | Wireless Sensor Node Core Supply |
|---|---|
Use Scenario: Powers baseband processor core logic and analog peripherals in LTE/5G smartphones where input rail shares noise with switching regulators. IC Role / Device Role / Timing Role: Low-noise, high-PSRR post-regulator delivering clean 2.8 V to sensitive RF and mixed-signal blocks. Use Value: 70 dB PSRR at 1 kHz rejects coupled DC/DC ripple, while 125 mV dropout enables efficient use of declining battery voltage. | Use Scenario: Supplies ultra-low-power MCU and BLE radio in battery-operated industrial sensor nodes requiring multi-year operation. IC Role / Device Role / Timing Role: Primary system regulator providing stable 2.8 V at sub-100 µA quiescent current during deep sleep. Use Value: 50 µA typical IQ minimizes standby drain; active discharge ensures safe reset sequencing when waking from sleep. |
| Portable Medical Pulse Oximeter | Camera Module Bias Supply |
Use Scenario: Powers photodiode amplifier and ADC in handheld pulse oximeters where EMI immunity and signal integrity are critical. IC Role / Device Role / Timing Role: Precision LDO delivering low-noise 2.8 V to analog front-end circuits with <±1% accuracy over temperature. Use Value: ±1% output accuracy ensures consistent LED drive and ADC reference, while 70 µVrms noise (10 Hz–100 kHz) preserves SNR. | Use Scenario: Provides controlled-ramp 2.8 V bias to CMOS image sensor I/O and analog blocks during camera initialization. IC Role / Device Role / Timing Role: Soft-starting LDO with 190 mV/s slew rate preventing supply droop and digital glitches during sensor power-up. Use Value: Normal-speed slew rate avoids excessive startup delay while eliminating inrush-induced system resets common with faster ramps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2802E/MB | 300 mA rated, 1.6 µA IQ, no active discharge, 600 mV dropout at 250 mA | Better for ultra-low-IQ always-on monitoring; unsuitable where fast VOUT decay or high PSRR is required | Select if lowest possible standby current dominates; avoid if PSRR >60 dB or active discharge is needed. |
| Torex XC6206P282MR-G | 150 mA rated, 1 µA IQ, no enable pin, no thermal shutdown, 350 mV dropout at 100 mA | Targeted at cost-sensitive, non-critical consumer wearables; lacks protection and sequencing features | Choose for simple, low-cost point-of-load use; reject for automotive, medical, or thermally constrained designs. |
Compared with MCP1700T-2802E/MB and XC6206P282MR-G, the NCP105AMX280TCG uniquely balances ultra-low-noise regulation (70 dB PSRR), active discharge, and robust protection - making it optimal for noise-sensitive, sequenced power systems in premium portable electronics.
Availability
NCP105AMX280TCG is available at Aetrix Electronics and suitable for smartphone baseband power, wireless sensor node core supply, portable medical pulse oximeter, and camera module bias supply requiring stable component supply across production lifecycles.
Supply support for NCP105AMX280TCG 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 power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCP105 series is part of onsemi's high-PSRR, low-IQ LDO portfolio designed specifically for battery-powered portable electronics where noise immunity, small size, and long runtime are critical.
FAQ
What is the output voltage tolerance of the NCP105AMX280TCG over temperature?
The NCP105AMX280TCG maintains ±1% output voltage accuracy at room temperature (25°C). Over the full operating junction temperature range (−40°C to +85°C), the output voltage deviation is specified as ±40 mV for VOUT ≤ 2.0 V - but since this device is 2.8 V, its tolerance remains ±2% across temperature, confirmed in the Electrical Characteristics table on page 3 of the datasheet.
Does the NCP105AMX280TCG support active output discharge, and how does it function?
Yes, the NCP105AMX280TCG supports active output discharge. When the EN pin is driven below 0.4 V, the internal 100 Ω discharge transistor connects the OUT pin to GND, rapidly pulling VOUT to zero. This feature is present in all NCP105A and NCP105C variants - and the "A" in NCP105AMX280TCG confirms it is an A-series device with this capability.
What is the recommended output capacitor for stable operation of the NCP105AMX280TCG?
The NCP105AMX280TCG is stable with a minimum 1 µF X5R or X7R ceramic capacitor on the OUT pin. The datasheet specifies that 0.47 µF is the minimum effective capacitance accounting for DC bias and temperature derating - so 1 µF 0402/0603 X7R is the standard recommendation. Tantalum capacitors are explicitly discouraged due to high ESR and temperature sensitivity.
Can the NCP105AMX280TCG operate from a 1.8 V input supply?
No - the NCP105AMX280TCG requires a minimum input voltage of 1.7 V, but its 2.8 V output necessitates sufficient headroom. At 150 mA load, the typical dropout is 125 mV, meaning VIN must be ≥ 2.925 V to maintain regulation. Therefore, 1.8 V is insufficient; the device requires ≥2.95 V input under full load, and ≥3.0 V is recommended for margin across temperature and tolerance.
How does the NCP105AMX280TCG compare to the NCP105CMX280TCG in terms of startup behavior?
The NCP105AMX280TCG uses the "normal" slew-rate option (190 mV/s), while the NCP105CMX280TCG uses the "slow" option (20 mV/s). Both provide soft-start, but the A-variant reaches 98% of 2.8 V (~2.74 V) in ~14.4 seconds, whereas the C-variant takes ~140 seconds - making the A-version suitable for general-purpose sequencing and the C-version reserved for highly sensitive camera or audio sensors requiring ultra-smooth ramp-up.
NCP105AMX280TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.21V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 95 µA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Current Limit
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-XDFN (1x1)
NCP105AMX280TCG FAQ
1.How can I place an order for NCP105AMX280TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP105AMX280TCG 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 NCP105AMX280TCG reliable?
The price and inventory of NCP105AMX280TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP105AMX280TCG is usually 5 days.
3.What payment methods are accepted for NCP105AMX280TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP105AMX280TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP105AMX280TCG?
NCP105AMX280TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP105AMX280TCG 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 NCP105AMX280TCG?
For technical support, including NCP105AMX280TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP105AMX280TCG requirements.
6.How does Aetrix verify that NCP105AMX280TCG is sourced from the original manufacturer or authorized distributors?
All NCP105AMX280TCG 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 NCP105AMX280TCG meets industry standards.
7.What is the process for return or replacement of NCP105AMX280TCG?
All NCP105AMX280TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP105AMX280TCG, 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 NCP105AMX280TCG part is unused and in its original packaging.
Return procedure for NCP105AMX280TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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