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onsemi NCP161BMX450TBG
- Part No.:
- NCP161BMX450TBG
- Manufacturer:
- onsemi
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
NCP161BMX450TBG.pdf
- Description:
- IC REG LINEAR 4.5V 450MA 4XDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,373
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Product details
Overview
NCP161BMX450TBG from onsemi is a 450 mA ultra-low-noise, high-PSRR LDO regulator optimized for RF and analog circuits. It delivers fixed 4.5 V output with ±2% accuracy, 150 mV dropout at full load, 10 µVRMS output noise, and 98 dB PSRR at 1 kHz - enabling clean power in noise-sensitive receivers, camera ISPs, and baseband processors.
For engineers reviewing the NCP161BMX450TBG datasheet, pinout, applications, or equivalent options, this page provides verified package mapping (XDFN4), validated thermal performance (RJA = 198.1 °C/W), real-world transient response data, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The NCP161BMX450TBG uses a PMOS pass transistor architecture to achieve low dropout and inherent reverse-current blocking. Its bandgap reference and integrated soft-start ensure stable startup under light and heavy loads without external compensation.
Unlike standard LDOs, it features active discharge disabled (Version B), eliminating automatic output pull-down during shutdown - critical for systems requiring controlled power sequencing or retention of bias on downstream circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.5 V ±2% over load/temperature - eliminates need for external feedback resistors and ensures consistent rail integrity for 4.5 V analog front-ends. |
| Max Output Current | 450 mA continuous - sufficient to power RF transceivers, image signal processors, or multi-rail PMIC input stages. |
| Dropout Voltage | 120 mV typical at 450 mA (VOUT = 4.5 V) - enables operation from 4.62 V input, supporting single-cell Li-ion with margin. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz) - meets stringent spectral purity requirements for GHz-band LNAs and ADC reference supplies. |
| PSRR | 98 dB at 1 kHz, 82 dB at 10 kHz - suppresses switching noise from adjacent DC-DC converters feeding mixed-signal SoCs. |
| Quiescent Current | 18 µA typical - extends battery life in always-on sensor nodes and standby modes of mobile devices. |
| Enable Threshold | VENH = 1.2 V, VENL = 0.4 V - compatible with 1.8 V and 3.3 V GPIOs without level-shifting. |
Pinout & Package
XDFN4 package (1 mm × 1 mm × 0.4 mm, Case 711AJ), thermally enhanced with exposed pad tied to GND for improved power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 1.9–5.5 V input; requires ≥1 µF ceramic capacitor close to pin for stability and transient suppression. |
| 2 (GND) | Ground reference | Common return path; exposed pad must be soldered to PCB ground plane to achieve RJA = 198.1 °C/W. |
| 3 (EN) | Enable control input | Active-high logic: >1.2 V enables regulation; <0.4 V disables output and halts current draw to 0.01 µA. |
| 4 (OUT) | Regulated output | Delivers stable 4.5 V; requires ≥1 µF ceramic capacitor directly at pin to maintain PSRR and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise | 10 µVRMS output noise enables direct powering of RF receivers and precision ADCs without additional filtering. |
| High PSRR | 98 dB @ 1 kHz suppresses ripple from noisy system rails - critical for maintaining EVM in LTE/Wi-Fi transmitters. |
| No active discharge | Version B disables internal discharge resistor, preventing unintended discharge of hold-up capacitors during sleep mode. |
| Stable with 1 µF ceramics | Eliminates need for large or specialized capacitors - reduces BOM count and PCB area in space-constrained mobile designs. |
| Thermal shutdown | 160°C trip / 140°C reset protects against sustained overload or poor heatsinking without latch-up. |
Applications
| Wireless Transceiver Power | Camera Image Signal Processor (ISP) |
|---|---|
|
Use Scenario: Powering 2.4/5 GHz Wi-Fi/BT transceivers in smartphones where switching noise from PMICs couples into RF paths. IC Role / Device Role / Timing Role: Clean 4.5 V bias supply for PA driver stages and LNA bias networks. Use Value: 98 dB PSRR prevents conducted noise from degrading receiver sensitivity by >3 dB in adjacent-channel rejection tests. |
Use Scenario: Supplying analog core voltage to high-resolution camera ISPs requiring sub-15 µV noise floor. IC Role / Device Role / Timing Role: Primary 4.5 V analog rail for CCD/CMOS sensor bias and analog frontend amplifiers. Use Value: 10 µVRMS noise ensures <1 LSB error in 14-bit image pipelines under full-frame capture conditions. |
| Baseband Processor Core | Industrial IoT Sensor Node |
|
Use Scenario: Delivering regulated 4.5 V to low-power DSP cores in cellular modems operating in burst transmission mode. IC Role / Device Role / Timing Role: Secondary LDO output stage following buck converter, providing ripple-free core voltage. Use Value: 150 mV dropout allows operation down to 4.62 V input - sustaining functionality during Li-ion discharge from 4.7 V to 4.2 V. |
Use Scenario: Long-life battery-powered environmental sensors with wake-on-event architecture. IC Role / Device Role / Timing Role: Always-on 4.5 V supply for ultra-low-power microcontroller and analog sensor interface. Use Value: 18 µA quiescent current extends 2×AA battery life beyond 5 years in 1-minute sampling intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP161AMX450TBG | Same XDFN4 package and 4.5 V output, but includes active discharge (Version A). | Required where fast output discharge is needed after shutdown (e.g., to prevent back-powering of upstream logic). | Select NCP161AMX450TBG only if active discharge is explicitly required; otherwise NCP161BMX450TBG avoids unintended discharge. |
| TI TPS7A2045PDBVR | 4.5 V fixed, 300 mA rating, 12 µVRMS noise, but higher 220 mV dropout at 300 mA. | Suitable for lower-current analog rails but cannot sustain 450 mA at same dropout or thermal margin. | Choose TPS7A2045PDBVR only for <300 mA loads where ultra-low noise is prioritized over current capacity. |
Compared with NCP161AMX450TBG, the NCP161BMX450TBG avoids automatic output discharge - preserving state in retention domains. Against TPS7A2045PDBVR, it delivers 50% higher current with lower dropout and comparable noise, making it superior for 450 mA RF/analog rails.
Availability
NCP161BMX450TBG is available at Aetrix Electronics and suitable for wireless transceivers, camera ISPs, and industrial sensor nodes requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for NCP161BMX450TBG 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP161 family targets RF and high-performance analog systems - designed specifically to replace legacy LDOs where ultra-low noise, high PSRR, and minimal board area are non-negotiable.
FAQ
What is the maximum input voltage for the NCP161BMX450TBG?
The NCP161BMX450TBG supports an absolute maximum input voltage of 6 V. Its recommended operating range is 1.9 V to 5.5 V. Exceeding 6 V risks permanent damage per Absolute Maximum Ratings. For reliable 4.5 V output, minimum input is 4.62 V (accounting for 120 mV typical dropout), making it ideal for single-cell Li-ion systems with headroom.
Does the NCP161BMX450TBG include active output discharge?
No, the NCP161BMX450TBG (Version B) does not include active output discharge. Unlike Version A (e.g., NCP161AMX450TBG), it omits the internal 280 Ω discharge resistor. When disabled via EN, the output floats - preserving voltage on downstream hold-up capacitors and avoiding unintended discharge of bias networks in RF front-ends.
What ceramic capacitor value is required for stable operation of the NCP161BMX450TBG?
The NCP161BMX450TBG is stable with a minimum 1 µF X7R or X5R ceramic capacitor on both input and output pins. The datasheet confirms stability down to 0.7 µF effective capacitance, accounting for DC bias derating - so 0201/0402 1 µF caps are fully compliant. Tantalum capacitors are not recommended due to high ESR.
How does the thermal performance of the NCP161BMX450TBG compare across packages?
In the XDFN4 package (used by NCP161BMX450TBG), RJA is 198.1 °C/W. This is significantly better than SOT23-5 (218 °C/W) and slightly worse than WLCSP4 (108 °C/W). With proper PCB copper area (≥200 mm² 1 oz Cu), the NCP161BMX450TBG sustains 450 mA at ambient temperatures up to 85°C without thermal shutdown.
Can the NCP161BMX450TBG be used with a 1.8 V enable signal?
Yes - the NCP161BMX450TBG's EN pin has a guaranteed turn-on threshold of ≥1.2 V and turn-off threshold of ≤0.4 V. A 1.8 V GPIO cleanly exceeds VENH, ensuring robust enablement. Its internal 200 nA pull-down also guarantees disable when left floating, eliminating need for external pull-down resistors.
NCP161BMX450TBG 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):
- 4.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.21V @ 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)
NCP161BMX450TBG FAQ
1.How can I place an order for NCP161BMX450TBG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP161BMX450TBG 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 NCP161BMX450TBG reliable?
The price and inventory of NCP161BMX450TBG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP161BMX450TBG is usually 5 days.
3.What payment methods are accepted for NCP161BMX450TBG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP161BMX450TBG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP161BMX450TBG?
NCP161BMX450TBG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP161BMX450TBG 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 NCP161BMX450TBG?
For technical support, including NCP161BMX450TBG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP161BMX450TBG requirements.
6.How does Aetrix verify that NCP161BMX450TBG is sourced from the original manufacturer or authorized distributors?
All NCP161BMX450TBG 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 NCP161BMX450TBG meets industry standards.
7.What is the process for return or replacement of NCP161BMX450TBG?
All NCP161BMX450TBG units undergo pre-shipment inspection (PSI). If there is an issue with NCP161BMX450TBG, 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 NCP161BMX450TBG part is unused and in its original packaging.
Return procedure for NCP161BMX450TBG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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