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onsemi NCP103AMX185TCG
- Part No.:
- NCP103AMX185TCG
- Manufacturer:
- onsemi
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
NCP103AMX185TCG.pdf
- Description:
- IC REG LINEAR 1.85V 150MA 4UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,475
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Product details
Overview
NCP103AMX185TCG from onsemi is a 150 mA CMOS low-dropout (LDO) regulator with fixed 1.85 V output, ±1% accuracy at room temperature, 75 mV typical dropout at 150 mA, and active output discharge functionality. It operates from 1.7 V to 5.5 V input and delivers ultra-low quiescent current (50 µA typ.) for battery-powered portable electronics requiring stable, low-noise voltage regulation.
For engineers reviewing the NCP103AMX185TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its uDFN4 1.0×1.0 mm package, enable-controlled shutdown with 0.1 µA standby current, 75 dB PSRR at 1 kHz, stability with 1 µF ceramic output capacitor, and thermal/current protection features.
Technical Context
The NCP103AMX185TCG employs a PMOS pass transistor architecture enabling low dropout and inherent reverse-current blocking. Its dynamic quiescent current adjustment optimizes efficiency across load conditions, while integrated thermal shutdown (160°C trip) and foldback current limiting (550 mA typ.) ensure robust operation under fault conditions.
Unlike standard LDOs, this variant includes an active output discharge function activated during shutdown-pulling VOUT to GND via a 100 Ω internal resistor-preventing floating outputs in multi-rail systems. The EN pin features hysteresis (0.9 V turn-on / 0.4 V turn-off thresholds) and internal 300 nA pull-down for default-off safety.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.85 V ±1% at room temperature - ensures precise biasing for 1.8 V logic rails without external feedback. |
| Max Output Current | 150 mA continuous - supports moderate-power peripherals like RF transceivers or sensor interfaces in compact devices. |
| Dropout Voltage | 120 mV typical at 150 mA - enables regulation from 2.0 V input, critical for single-cell Li-ion or Li-poly battery systems. |
| Quiescent Current | 50 µA typical at no load - extends battery life in always-on monitoring or sleep-mode applications. |
| PSRR | 75 dB at 1 kHz - suppresses switching noise from adjacent DC-DC converters, preserving signal integrity in analog/RF sections. |
| Output Capacitor | Stable with ≥1 µF X5R/X7R ceramic - eliminates need for tantalum or electrolytic capacitors, reducing board area and cost. |
| Enable Threshold | 0.9 V high / 0.4 V low - compatible with 1.8 V GPIOs and provides noise margin against supply ripple on control lines. |
Pinout & Package
Package: uDFN4 1.0 × 1.0 mm, 0.65 mm pitch, exposed pad (Case 517CU). Thermal resistance RJA = 170 °C/W on 1 oz FR-4 with 645 mm² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Regulated output | Delivers 1.85 V; requires ≥1 µF ceramic capacitor to GND for stability and transient response. |
| 2 - GND | Power ground | Reference node for regulation; exposed pad must be soldered directly to GND plane for thermal and electrical performance. |
| 3 - EN | Enable control input | Logic-level interface: >0.9 V enables regulator; <0.4 V disables it and activates output discharge. |
| 4 - IN | Input supply | Accepts 1.7–5.5 V; requires local 1 µF ceramic decoupling to minimize input impedance and EMI susceptibility. |
Key Features
| Feature | Design Value |
|---|---|
| Active output discharge | 100 Ω internal discharge path to GND during shutdown - prevents residual voltage on downstream circuits and enables safe power sequencing. |
| Ultra-low IQ optimization | Dynamic quiescent current scaling - maintains 50 µA at no load while adapting to higher loads without sacrificing regulation accuracy. |
| High PSRR architecture | 75 dB @ 1 kHz, >60 dB up to 100 kHz - mitigates noise coupling from shared power rails in mixed-signal SoC designs. |
| Robust protection suite | Thermal shutdown (160°C), current limit (550 mA), and short-circuit immunity - eliminates need for external fault management circuitry. |
| Small-footprint packaging | uDFN4 1.0×1.0 mm - reduces PCB area by >50% vs. SOT-23, enabling ultra-compact wearable and IoT endpoint designs. |
Applications
| Smartphone Baseband Power | Wireless Headset Audio Codec Supply |
|---|---|
|
Use Scenario: Powers baseband processor I/O and memory interfaces in space-constrained smartphone mainboards. IC Role / Device Role / Timing Role: Primary 1.85 V LDO delivering clean, regulated voltage with fast load transient response to handle burst-mode processing. Use Value: 75 mV dropout enables operation down to 2.0 V input, extending usable battery range; 75 dB PSRR isolates sensitive digital logic from noisy PMIC switching noise. |
Use Scenario: Supplies low-noise 1.85 V bias to stereo audio codec ICs in Bluetooth headsets. IC Role / Device Role / Timing Role: Low-noise linear regulator providing stable rail for analog-to-digital conversion and headphone driver stages. Use Value: 60 µVRMS output noise (10 Hz–100 kHz) preserves SNR in audio paths; 1 µF ceramic compatibility simplifies layout in miniaturized earbud PCBs. |
| Portable Medical Pulse Oximeter | IoT Sensor Node Microcontroller Core |
|
Use Scenario: Regulates power for optical sensor front-end and ADC in battery-operated pulse oximeters. IC Role / Device Role / Timing Role: Precision LDO ensuring stable reference voltage for photodiode signal conditioning and analog measurement accuracy. Use Value: ±1% output accuracy over −40°C to +85°C guarantees consistent calibration; 50 µA quiescent current maximizes battery runtime between clinical measurements. |
Use Scenario: Provides core voltage to ARM Cortex-M microcontrollers in long-life wireless sensor nodes. IC Role / Device Role / Timing Role: Enable-controlled LDO enabling deep-sleep mode with 0.1 µA shutdown current and rapid wake-up via EN pin. Use Value: Active output discharge clears VDD rail before MCU reset, preventing latch-up; uDFN4 footprint fits within 3×3 mm system-in-package constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT | 150 mA, 1.8 V fixed, 1.6 µA IQ, no active discharge, SOT-23-5 package | Lacks output discharge; higher dropout (280 mV @ 150 mA); larger footprint | Select when ultra-low IQ dominates over discharge requirement and board space allows SOT-23. |
| Torex XC6206P182MR-G | 150 mA, 1.8 V fixed, 1 µA IQ, no enable pin, SOT-25 package | No EN control or active discharge; unregulated shutdown behavior; lower PSRR (65 dB) | Choose only for simple always-on applications where enable sequencing and rail cleanup are unnecessary. |
Compared with MCP1700T-1802E/TT and XC6206P182MR-G, the NCP103AMX185TCG uniquely combines 1.85 V precision output, active discharge, and uDFN4 size-making it optimal for sequenced, space-limited, battery-critical systems where rail integrity during state transitions matters.
Availability
NCP103AMX185TCG is available at Aetrix Electronics and suitable for smartphone baseband power, wireless headset audio supplies, portable medical sensors, and IoT microcontroller core regulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP103AMX185TCG 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.
The NCP103 series was designed specifically for ultra-low-power, space-constrained portable electronics-emphasizing minimal quiescent current, small footprint, and integrated protection for reliable battery-powered operation.
FAQ
What is the output voltage tolerance of the NCP103AMX185TCG over temperature?
The NCP103AMX185TCG maintains ±1% output voltage accuracy at room temperature (25°C). Over the full operating junction temperature range (−40°C to +85°C), the deviation is specified as ±40 mV for VOUT ≤ 2.0 V - which applies directly to its 1.85 V nominal output. This ensures stable biasing for 1.8 V logic families across environmental extremes without external trimming.
Does the NCP103AMX185TCG require an external capacitor on the EN pin?
No, the NCP103AMX185TCG does not require an external capacitor on the EN pin. Its enable input has internal hysteresis and a 300 nA pull-down current source, allowing direct connection to a GPIO or resistive divider. Adding capacitance may slow enable timing and is unnecessary unless intentional debouncing is required - the device's 90 µs typical turn-on time assumes direct drive.
Can the NCP103AMX185TCG be used with input voltages below 1.7 V?
No - the absolute minimum input voltage for the NCP103AMX185TCG is 1.7 V per the Absolute Maximum Ratings table. Operation below this threshold risks undefined behavior, including failure to regulate or activate protection circuits. For sub-1.7 V inputs, consider alternative regulators such as the NCP103BMX120TCG (1.2 V option) or dedicated ultra-low-input LDOs.
How does the active output discharge function work in the NCP103AMX185TCG?
When the EN pin is driven below 0.4 V, the NCP103AMX185TCG disables regulation and activates an internal 100 Ω NMOS discharge switch between OUT and GND. This pulls the output voltage to near-zero within microseconds, preventing floating states that could cause leakage, unintended logic states, or latch-up in downstream circuitry - a critical feature for multi-rail power sequencing.
Is the NCP103AMX185TCG compatible with 0402-size ceramic output capacitors?
Yes - the NCP103AMX185TCG is explicitly characterized for stability with 1 µF X5R/X7R ceramic capacitors, including 0402 packages. Its internal compensation accommodates the reduced effective capacitance of small-case MLCCs under DC bias, making it ideal for ultra-dense layouts where board area is constrained and traditional 0603 or larger caps are impractical.
NCP103AMX185TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-UDFN 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):
- 1.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 95 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (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:
- 4-UDFN (1.0x1.0)
NCP103AMX185TCG FAQ
1.How can I place an order for NCP103AMX185TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP103AMX185TCG 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 NCP103AMX185TCG reliable?
The price and inventory of NCP103AMX185TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP103AMX185TCG is usually 5 days.
3.What payment methods are accepted for NCP103AMX185TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP103AMX185TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP103AMX185TCG?
NCP103AMX185TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP103AMX185TCG 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 NCP103AMX185TCG?
For technical support, including NCP103AMX185TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP103AMX185TCG requirements.
6.How does Aetrix verify that NCP103AMX185TCG is sourced from the original manufacturer or authorized distributors?
All NCP103AMX185TCG 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 NCP103AMX185TCG meets industry standards.
7.What is the process for return or replacement of NCP103AMX185TCG?
All NCP103AMX185TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP103AMX185TCG, 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 NCP103AMX185TCG part is unused and in its original packaging.
Return procedure for NCP103AMX185TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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