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onsemi NCP161BMX285TBG
- Part No.:
- NCP161BMX285TBG
- Manufacturer:
- onsemi
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
NCP161BMX285TBG.pdf
- Description:
- IC REG LINEAR 2.85V 450MA 4XDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,499
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Product details
Overview
NCP161BMX285TBG from onsemi is a 450 mA ultra-low-noise, high-PSRR LDO regulator with 2.85 V fixed output, 150 mV dropout at full load, ±2% output accuracy over temperature and load, and 10 µVRMS integrated noise (10 Hz–100 kHz). Designed for RF and analog power rails in smartphones and wireless LAN devices, it operates from 1.9 V to 5.5 V input and supports stable regulation with only 1 µF ceramic input/output capacitors.
For engineers reviewing the NCP161BMX285TBG datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (XDFN4, 1 mm × 1 mm), validated terminal functions, confirmed thermal shutdown (160°C), active discharge absence, and real-world transient performance data for battery-powered RF subsystem design.
Technical Context
The NCP161BMX285TBG uses a PMOS pass transistor architecture enabling low dropout and inherent reverse-current blocking. Its bandgap reference and integrated soft-start ensure precise 2.85 V regulation with minimal line/load transients-±1 mV line transient and ±40 mV load transient under specified test conditions.
Unlike Version A variants, this B-version omits active output discharge: EN < 0.4 V disables regulation and leaves VOUT floating, with shutdown current limited to 0.01–1 µA. PSRR reaches 98 dB at 1 kHz and remains >48 dB up to 100 kHz, while noise spectral density stays below 10.4 nV/√Hz across 100 Hz–100 kHz at 250 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85 V ±2% - eliminates external feedback network; enables direct replacement of legacy 2.8 V/2.9 V rails without resistor recalibration. |
| Max Output Current | 450 mA continuous - sufficient to power RF transceivers (e.g., Wi-Fi 6 front-end modules) or high-speed ADC/DAC analog supplies. |
| Dropout Voltage | 170 mV typical at 450 mA - allows operation from single-cell Li-ion (3.0 V min) with ≥150 mV headroom for battery sag. |
| PSRR | 98 dB @ 1 kHz, 48 dB @ 100 kHz - suppresses switching noise from DC-DC converters feeding adjacent digital blocks. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz) - meets stringent phase-noise requirements for local oscillator (LO) supply in 5 GHz WLAN radios. |
| Quiescent Current | 18 µA typical - extends battery life in always-on sensor nodes or standby RF receivers. |
| Enable Threshold | VENH = 1.2 V, VENL = 0.4 V - compatible with 1.8 V GPIOs and ensures clean sequencing with microcontrollers. |
Pinout & Package
XDFN4 package (Case 711AJ): 1 mm × 1 mm × 0.4 mm body, exposed thermal pad (EPAD) tied to GND for enhanced thermal dissipation. Thermal resistance RJA = 198.1°C/W on JEDEC standard board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 1.9–5.5 V; requires 1 µF X7R/X5R ceramic capacitor placed adjacent to minimize trace inductance. |
| 2 (GND) | Ground reference | Common return path for IN, OUT, and EN; EPAD must be soldered to PCB ground plane for thermal and electrical integrity. |
| 3 (EN) | Enable control input | Logic-high (>1.2 V) enables regulation; logic-low (<0.4 V) disables output (no active discharge); internal 200 nA pull-down ensures default-off state. |
| 4 (OUT) | Regulated output | Delivers stable 2.85 V; bypassed with 1 µF ceramic capacitor; ESR < 2 Ω required for stability across temperature and bias. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise | 10 µVRMS (10 Hz–100 kHz) - preserves SNR in RF receiver chains and high-resolution audio DACs. |
| High PSRR | 98 dB @ 1 kHz - rejects ripple from shared buck converter outputs without additional LC filtering. |
| Low dropout | 170 mV @ 450 mA - enables efficient use of aging Li-ion batteries down to 3.0 V system voltage. |
| Stable with 1 µF ceramics | No minimum ESR requirement for COUT - simplifies layout and reduces BOM count vs. traditional LDOs requiring tantalum or polymer caps. |
| Thermal protection | Auto-shutdown at 160°C, restart at 140°C - prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Smartphone RF Front-End | Wi-Fi 6 Transceiver Supply |
|---|---|
|
Use Scenario: Powering 5 GHz PA driver and LNA stages in compact smartphone PCBs with tight thermal constraints. IC Role / Device Role / Timing Role: Low-noise analog rail generator for RF signal chain; replaces noisier switching regulators near sensitive receive paths. Use Value: 10 µVRMS noise and 98 dB PSRR prevent reciprocal mixing and maintain EVM < 3% in 1024-QAM transmissions. |
Use Scenario: Dedicated 2.85 V supply for IEEE 802.11ax baseband ICs requiring clean clock distribution and ADC reference voltage. IC Role / Device Role / Timing Role: Precision analog voltage source for PLL charge pumps and SAR ADC references. Use Value: ±2% output accuracy and < ±40 mV load transient ensure jitter < 150 fs RMS in 160 MHz sampling clocks. |
| Industrial IoT Sensor Node | Automotive Camera Module |
|
Use Scenario: Always-on power for BLE/Wi-Fi SoCs in battery-operated environmental sensors deployed for >5 years. IC Role / Device Role / Timing Role: Primary regulated rail for MCU, radio, and precision analog front-end (AFE). Use Value: 18 µA quiescent current and 0.01 µA shutdown current extend CR2032 battery life beyond 7 years in sleep mode. |
Use Scenario: Powering image signal processor (ISP) analog core and CIS analog bias in ADAS rear-view cameras. IC Role / Device Role / Timing Role: Low-noise supply for CIS pixel array readout and ISP analog video processing block. Use Value: 170 mV dropout enables operation from automotive 3.3 V domain during cold-crank (down to 2.8 V), avoiding brownout resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B285MR-G | 250 mA max output, 220 mV dropout @ 250 mA, 25 µVRMS noise, no enable pin | Lacks EN control and current capability for RF PA bias; suitable only for low-power sensor AFEs | Select only if system load ≤250 mA and sequencing via external switch is acceptable. |
| ROHM BD3985FVM-2.85TR | 500 mA max output, 180 mV dropout @ 500 mA, 12 µVRMS noise, includes active discharge | Active discharge may cause unintended VOUT collapse in systems with hold-up capacitance on downstream rails | Prefer when higher current headroom is needed and controlled discharge during disable is required. |
Compared with Torex XC6210B285MR-G and ROHM BD3985FVM-2.85TR, the NCP161BMX285TBG uniquely balances 450 mA drive, 10 µVRMS noise, and EN-controlled disable without active discharge-making it optimal for sequenced RF power domains where output floating during sleep is intentional.
Availability
NCP161BMX285TBG is available at Aetrix Electronics and suitable for smartphone RF front-end, Wi-Fi 6 transceiver supply, and industrial IoT sensor node applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP161BMX285TBG 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 silicon solutions for automotive, industrial, cloud, medical, and edge applications.
The NCP161 series targets RF and high-performance analog circuits, emphasizing ultra-low noise, high PSRR, and minimal quiescent current to enable next-generation wireless and sensing platforms.
FAQ
What is the maximum input voltage rating for the NCP161BMX285TBG?
The NCP161BMX285TBG has an absolute maximum input voltage of 6 V. Operation above 5.5 V violates the recommended operating range and risks permanent damage. For reliable long-term use, keep VIN between 1.9 V and 5.5 V, with ≥170 mV headroom above 2.85 V to maintain regulation under full 450 mA load.
Does the NCP161BMX285TBG include active output discharge?
No, the NCP161BMX285TBG is a "B" version device and does not feature active output discharge. When EN is pulled low (<0.4 V), the pass transistor turns off and VOUT floats-no internal discharge path is activated. This behavior differs from "A" versions (e.g., NCP161AFCT285T2G), which integrate a 280 Ω discharge resistor.
What ceramic capacitor dielectric is recommended for NCP161BMX285TBG input and output?
X7R or X5R dielectric ceramic capacitors are recommended for both CIN and COUT. These offer stable capacitance over temperature (±15% for X7R, ±15% for X5R) and low ESR/ESL. Avoid Y5V or Z5U due to excessive capacitance loss at DC bias and temperature extremes, which can compromise transient response and stability.
Can the NCP161BMX285TBG operate with less than 1 µF output capacitance?
The NCP161BMX285TBG is characterized for stability with ≥0.7 µF effective output capacitance, accounting for DC bias and temperature derating. While 1 µF is the recommended nominal value, smaller case sizes (e.g., 0201) may deliver only ~0.7 µF at 2.85 V bias. Using <0.7 µF risks instability, especially under fast load transients-verify with actual board-level testing if deviating.
What is the thermal shutdown threshold and hysteresis of the NCP161BMX285TBG?
The NCP161BMX285TBG triggers thermal shutdown at 160°C (typical) and resumes regulation when junction temperature falls to 140°C (typical), yielding 20°C hysteresis. This protects against catastrophic failure during sustained overload but is not a substitute for proper PCB copper area and thermal pad design-RJA = 198.1°C/W assumes JEDEC-standard 1 oz Cu board.
NCP161BMX285TBG 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):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.29V @ 450mA
- Current - Output:
- 450mA
- Current - Quiescent (Iq):
- 23 µA
- Current - Supply (Max):
- -
- PSRR:
- 91dB ~ 48dB (100Hz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-XDFN (1x1)
NCP161BMX285TBG FAQ
1.How can I place an order for NCP161BMX285TBG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP161BMX285TBG 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 NCP161BMX285TBG reliable?
The price and inventory of NCP161BMX285TBG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP161BMX285TBG is usually 5 days.
3.What payment methods are accepted for NCP161BMX285TBG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP161BMX285TBG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP161BMX285TBG?
NCP161BMX285TBG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP161BMX285TBG 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 NCP161BMX285TBG?
For technical support, including NCP161BMX285TBG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP161BMX285TBG requirements.
6.How does Aetrix verify that NCP161BMX285TBG is sourced from the original manufacturer or authorized distributors?
All NCP161BMX285TBG 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 NCP161BMX285TBG meets industry standards.
7.What is the process for return or replacement of NCP161BMX285TBG?
All NCP161BMX285TBG units undergo pre-shipment inspection (PSI). If there is an issue with NCP161BMX285TBG, 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 NCP161BMX285TBG part is unused and in its original packaging.
Return procedure for NCP161BMX285TBG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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