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onsemi NCP103AMX350TCG
- Part No.:
- NCP103AMX350TCG
- Manufacturer:
- onsemi
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
NCP103AMX350TCG.pdf
- Description:
- IC REG LINEAR 3.5V 150MA 4UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,609
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Product details
Overview
NCP103AMX350TCG from onsemi is a 150 mA CMOS low-dropout (LDO) regulator with fixed 3.5 V output, optimized for battery-powered portable electronics. It delivers ±1% output accuracy at room temperature, 75 mV typical dropout at 150 mA load, and 75 dB PSRR at 1 kHz - enabling stable power delivery in noise-sensitive RF and analog subsystems of smartphones and wireless handsets.
For engineers reviewing the NCP103AMX350TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its active output discharge function (enabled only in "A"-suffix variants), ultra-low 50 µA typical quiescent current, compatibility with 1 µF ceramic output capacitors, and uDFN4 1.0×1.0 mm package for space-constrained designs.
Technical Context
The NCP103AMX350TCG employs a PMOS pass transistor architecture with dynamic quiescent current adjustment to minimize IQ across load conditions. Its internal bandgap reference and error amplifier maintain tight regulation over −40°C to +85°C junction temperature, while thermal shutdown (160°C typical) and current limiting (550 mA typical) provide robust fault protection.
Unlike standard LDOs, this variant integrates an active output discharge transistor (RDIS = 100 Ω typical) that pulls VOUT to GND when EN < 0.4 V - eliminating residual voltage hold-up during shutdown. The enable logic features hysteresis (VENHI = 0.9 V, VENLO = 0.4 V) and internal 300 nA pull-down, supporting direct connection to microcontroller GPIOs without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.5 V ±2% (for VOUT > 2.0 V); ensures precise biasing of 3.3 V–3.6 V logic rails without external feedback. |
| Max Output Current | 150 mA continuous; supports moderate-power peripherals like Bluetooth baseband ICs or sensor hubs. |
| Dropout Voltage | 72 mV typical at 150 mA (VOUT = 3.0 V); enables operation down to VIN = 3.572 V, critical for Li-ion battery discharge tail-end. |
| Quiescent Current | 50 µA typical at no load; extends battery life in always-on monitoring modes (e.g., wake-on-RF). |
| PSRR | 75 dB at 1 kHz; suppresses switching noise from DC-DC converters feeding the LDO input. |
| Stability | Guaranteed with ≥1 µF X5R/X7R ceramic output capacitor; eliminates need for high-ESR tantalum or electrolytic caps. |
| Enable Threshold | VENHI = 0.9 V, VENLO = 0.4 V; compatible with 1.8 V and 3.3 V GPIO logic levels without level-shifting. |
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 | Connect ≥1 µF ceramic capacitor directly to GND; minimum effective capacitance 0.22 µF accounts for DC bias/temperature drift. |
| 2: GND | Power ground | Must connect exposed pad (EPAD) directly to GND plane for thermal and EMI performance; shortest possible trace. |
| 3: EN | Enable control | Drives high (>0.9 V) to enable; low (<0.4 V) to disable and activate 100 Ω output discharge path. |
| 4: IN | Input supply | Requires ≥1 µF ceramic capacitor close to pin; low-ESR/ESL essential for transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Active output discharge | 100 Ω typical discharge resistance (EN < 0.4 V) clears VOUT within microseconds - prevents back-powering or latch-up in multi-rail systems. |
| Ultra-low IQ | 50 µA typical quiescent current at zero load; reduces standby power by >90% vs. legacy LDOs in always-on sensor nodes. |
| Low-noise regulation | 60 µVRMS output noise (10 Hz–100 kHz, VOUT = 1.8 V); preserves SNR in ADC reference or RF synthesizer VCO supplies. |
| Robust protection | Thermal shutdown (160°C), current limit (550 mA), and short-circuit immunity (infinite duration) eliminate need for external fusing. |
| Small-footprint stability | Stable with 0402-size 1 µF X7R ceramics; enables <1.5 mm² total solution size including decoupling caps. |
Applications
| Smartphone Power Management | Wireless Audio SoC Supply |
|---|---|
Use Scenario: Providing clean 3.5 V bias to RF front-end modules and baseband processors during deep-sleep mode. IC Role / Device Role / Timing Role: Primary LDO for noise-sensitive analog circuitry requiring <100 µV ripple and fast load transient recovery. Use Value: 75 dB PSRR at 1 kHz rejects switcher noise from main PMIC; 50 µA IQ extends standby time beyond 72 hours. |
Use Scenario: Powering Bluetooth LE audio codec ICs in true wireless stereo (TWS) earbuds with tight PCB space constraints. IC Role / Device Role / Timing Role: Secondary LDO delivering regulated 3.5 V from intermediate 3.8 V battery rail. Use Value: uDFN4 1.0×1.0 mm footprint fits within 2.5 mm × 2.5 mm module area; active discharge prevents pop/click on power-down. |
| Portable Medical Sensor Hub | IoT Edge Node MCU Core Supply |
Use Scenario: Supplying 3.5 V to low-power ECG/PPG analog front-ends in wearable health monitors. IC Role / Device Role / Timing Role: Precision LDO ensuring <±1% output accuracy across body-temperature range (−10°C to +50°C). Use Value: ±1% accuracy at room temperature and <30 mV load regulation (1–150 mA) maintains signal integrity for 16-bit ADC references. |
Use Scenario: Regulating core voltage for ARM Cortex-M4 MCUs in battery-operated industrial IoT gateways. IC Role / Device Role / Timing Role: Main system LDO enabling dynamic voltage scaling between active and sleep states. Use Value: 72 mV dropout at 150 mA allows operation until battery reaches 3.572 V; 90 µs turn-on time meets MCU wake-from-sleep timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3502E/TT | No active output discharge; 2.5 µA IQ (lower), but 250 mV dropout at 250 mA; SOT-23-5 package. | Lacks discharge function - unsuitable where residual VOUT causes cross-conduction in multi-supply systems. | Prefer when ultra-low IQ dominates over discharge requirement and board space permits larger SOT-23 footprint. |
| Torex XC6210B352MR-G | 3.5 V fixed, 150 mA, 120 mV dropout at 150 mA; 1 µA IQ; no thermal shutdown; SOT-25 package. | Lower IQ but higher dropout and missing thermal/current protection - requires external supervision in high-ambient environments. | Select only in thermally benign, ultra-low-power applications where full protection is handled at system level. |
Compared with MCP1700T-3502E/TT and XC6210B352MR-G, the NCP103AMX350TCG uniquely combines active output discharge, 75 dB PSRR, and integrated thermal/current protection in a 1.0×1.0 mm footprint - making it optimal for compact, safety-critical portable designs where controlled shutdown and noise immunity are mandatory.
Availability
NCP103AMX350TCG is available at Aetrix Electronics and suitable for smartphone power management, wireless audio SoC supply, portable medical sensor hubs, and IoT edge node MCU core supply requiring stable component supply with long-term lifecycle support.
Supply support for NCP103AMX350TCG 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 electronics for automotive, industrial, cloud, and consumer applications.
The NCP103 series is part of onsemi's precision analog portfolio, designed specifically for ultra-low-power, noise-sensitive battery-operated devices where small size, high PSRR, and reliable shutdown behavior are critical.
FAQ
What is the output voltage tolerance of the NCP103AMX350TCG over temperature?
The NCP103AMX350TCG provides ±2% output voltage accuracy for VOUT > 2.0 V across −40°C to +85°C junction temperature. At room temperature (25°C), it achieves tighter ±1% accuracy. This tolerance ensures reliable operation of 3.3 V logic interfaces even under thermal stress in handheld devices.
Does the NCP103AMX350TCG require an external resistor network for output voltage setting?
No, the NCP103AMX350TCG is a fixed-output LDO with factory-trimmed 3.5 V regulation - no external resistors are needed. Its internal bandgap reference and error amplifier deliver stable output without feedback components, reducing BOM count and PCB area versus adjustable LDOs.
How does the active output discharge function work in the NCP103AMX350TCG?
When the EN pin voltage drops below 0.4 V, the NCP103AMX350TCG activates an internal 100 Ω discharge transistor between OUT and GND. This rapidly discharges the output capacitor, bringing VOUT to near-zero volts within microseconds - preventing back-powering of upstream circuits or audio pop during shutdown.
Can the NCP103AMX350TCG operate with a 1.7 V input voltage while delivering 3.5 V output?
No - the NCP103AMX350TCG cannot regulate 3.5 V output from 1.7 V input. Its minimum operating input voltage is 1.7 V, but the input must exceed the output voltage plus dropout (≥3.572 V typical at 150 mA). Operation below this violates regulation and triggers undervoltage lockout.
Is the NCP103AMX350TCG RoHS compliant and lead-free?
Yes, the NCP103AMX350TCG is Pb-free, halogen-free/BFR-free, and fully RoHS compliant per EU Directive 2011/65/EU. Its uDFN4 package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for standard assembly processes.
NCP103AMX350TCG 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):
- 3.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- 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)
NCP103AMX350TCG FAQ
1.How can I place an order for NCP103AMX350TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP103AMX350TCG 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 NCP103AMX350TCG reliable?
The price and inventory of NCP103AMX350TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP103AMX350TCG is usually 5 days.
3.What payment methods are accepted for NCP103AMX350TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP103AMX350TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP103AMX350TCG?
NCP103AMX350TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP103AMX350TCG 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 NCP103AMX350TCG?
For technical support, including NCP103AMX350TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP103AMX350TCG requirements.
6.How does Aetrix verify that NCP103AMX350TCG is sourced from the original manufacturer or authorized distributors?
All NCP103AMX350TCG 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 NCP103AMX350TCG meets industry standards.
7.What is the process for return or replacement of NCP103AMX350TCG?
All NCP103AMX350TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP103AMX350TCG, 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 NCP103AMX350TCG part is unused and in its original packaging.
Return procedure for NCP103AMX350TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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