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onsemi NCP706MX21TAG
- Part No.:
- NCP706MX21TAG
- Manufacturer:
- onsemi
- Package:
- 8-XFDFN Exposed Pad
- Datasheet:
-
NCP706MX21TAG.pdf
- Description:
- IC REG LINEAR 2.1V 1A 8XDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,163
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Product details
Overview
NCP706MX21TAG from onsemi is a 2.1 V fixed-output, 1 A very low dropout (LDO) linear regulator with enable control, ±1% output voltage accuracy over load/line/temperature, 155 mV max dropout at 1 A, and stable operation with only a 4.7 µF ceramic output capacitor - designed for Li-ion battery-powered portable electronics including smartphones and tablets.
For engineers reviewing the NCP706MX21TAG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal behavior, decoupling guidance, EN/SNS pin functionality, and real-world design constraints for space-constrained, battery-sensitive systems.
Technical Context
The NCP706MX21TAG integrates a PMOS pass transistor enabling ultra-low dropout performance and internal soft-start to limit inrush current. Its remote sense (SNS) pin supports accurate regulation at the load by compensating for PCB trace IR drop.
It operates across 2.4 V–5.5 V input range, features thermal shutdown (160°C trip), current limiting (1.1 A), and high PSRR (60 dB @ 1 kHz), making it suitable for noise-sensitive analog rails and post-regulation of switching converter outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.1 V ±1% (2.079–2.121 V) - ensures stable core or I/O rail for low-voltage SoCs without external feedback. |
| Max Output Current | 1 A continuous - supports high-current peripherals like displays or RF modules in portable devices. |
| Dropout Voltage | ≤155 mV at 1 A - enables regulation down to VIN = 2.255 V, maximizing battery runtime in single-cell Li-ion systems. |
| Quiescent Current | 180–230 µA - minimizes standby power loss, critical for always-on functions in battery-powered applications. |
| PSRR | 60 dB @ 1 kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
| Stability | Guaranteed with ≥4.7 µF ceramic output capacitor - eliminates need for bulky tantalum or electrolytic caps, saving board area. |
| Enable Threshold | VEN_HI = 0.9 V, VEN_LO = 0.4 V - compatible with standard GPIOs and allows clean sequencing in multi-rail systems. |
Pinout & Package
XDFN8 1.6 mm × 1.2 mm, 0.4 mm pitch, thermally enhanced package with exposed pad (electrically tied to GND); optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT | Regulated output | Dual-output pins reduce trace resistance and improve current sharing; connect directly to load rail with minimal loop inductance. |
| 3 - N/C | Not connected | May be tied to GND to enhance thermal dissipation - improves junction-to-board thermal path without electrical impact. |
| 4 - SNS | Remote sense input | Connects directly to load point to compensate for voltage drop across PCB traces - maintains ±1% accuracy at point-of-load. |
| 5 - GND | Power ground | Primary return path; must be low-impedance and tied to exposed pad for optimal thermal and electrical performance. |
| 6 - EN | Enable control | Active-high logic input; drives regulator ON/OFF - enables power sequencing and system-level sleep mode control. |
| 7, 8 - IN | Input supply | Dual-input pins lower impedance and reduce voltage drop under peak current - improves transient response and stability. |
| Exposed Pad | Thermal & GND connection | Electrically GND; soldering to large copper pour significantly lowers RθJA (160°C/W typical) and extends safe operating area. |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout | 155 mV max at 1 A - enables >90% battery utilization in 2.1 V systems powered by 2.4–5.5 V inputs. |
| ±1% output accuracy | Over full −40°C to +125°C range, line, and load - eliminates need for post-production calibration in precision rails. |
| Internal soft-start | 200 µs turn-on time - prevents inrush current spikes that could destabilize upstream supplies or trigger overcurrent protection. |
| Stable with ceramic capacitors | Minimum 4.7 µF X7R/X5R MLCC - reduces BOM cost and footprint vs. tantalum, while improving reliability and temperature stability. |
| Thermal & short-circuit protection | 160°C shutdown with 20°C hysteresis + current limit - ensures robust operation during fault conditions without external circuitry. |
Applications
| Smartphone Core Rail | Tablet I/O Power |
|---|---|
Use Scenario: Powers application processor I/O domain in compact smartphone designs where input is derived from a 3.0 V buck converter. IC Role / Device Role / Timing Role: Post-regulator delivering clean, tightly regulated 2.1 V to memory interfaces and peripheral controllers. Use Value: Maintains ±1% accuracy across temperature and load transients, preventing timing violations in high-speed DDR interfaces. |
Use Scenario: Supplies 2.1 V to USB PHY and touch controller in 7-inch tablet with constrained PCB area near edge connectors. IC Role / Device Role / Timing Role: Low-noise, space-optimized LDO placed adjacent to load with remote sense (SNS) routing. Use Value: 4.7 µF ceramic stability and 60 dB PSRR suppress noise from nearby RF sections and switching regulators. |
| Portable Medical Sensor Hub | Wearable BLE Subsystem |
Use Scenario: Powers analog front-end (AFE) and ADC in handheld ECG monitor requiring ultra-stable reference voltage. IC Role / Device Role / Timing Role: Precision low-dropout regulator providing ripple-free 2.1 V to signal chain components. Use Value: 280 µVRMS output noise and <2 mV load/line regulation ensure sub-LSB measurement accuracy. |
Use Scenario: Supplies 2.1 V to Bluetooth LE SoC and sensors in coin-cell–powered fitness tracker with aggressive power budget. IC Role / Device Role / Timing Role: Enable-controlled LDO enabling deep-sleep mode with only 0.1–1 µA shutdown current. Use Value: 180–230 µA quiescent current extends battery life beyond 6 months in intermittent sensing applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B212MR-G | 2.1 V fixed, 1 A, 250 mV dropout @ 1 A, no SNS pin, 25 µA IQ | Lacks remote sense; less accurate under PCB trace drop; better for ultra-low-IQ non-critical rails | Choose when board layout avoids long traces and lowest quiescent current is prioritized over load regulation accuracy. |
| Richtek RT9013-21GB | 2.1 V fixed, 500 mA, 200 mV dropout @ 500 mA, no SNS, 60 µA IQ | Lower current rating and no remote sense; smaller 1.2×1.2 mm DFN package | Choose for space-limited, sub-500 mA loads where SNS compensation is unnecessary and footprint is critical. |
Compared with Torex XC6210B212MR-G and Richtek RT9013-21GB, the NCP706MX21TAG uniquely combines 1 A capability, 155 mV dropout, ±1% accuracy with SNS, and proven stability with 4.7 µF ceramic - making it the only option among the three qualified for high-accuracy, high-current, point-of-load regulation in dense portable systems.
Availability
NCP706MX21TAG is available at Aetrix Electronics and suitable for smartphone power management, tablet I/O regulation, and portable medical sensor hub designs requiring stable component supply, Pb-free compliance, and guaranteed long-term availability.
Supply support for NCP706MX21TAG 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 specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and portable electronics.
The NCP706MX21TAG belongs to onsemi's precision LDO family engineered for battery-powered portable devices - emphasizing ultra-low dropout, tight accuracy, small footprint, and robust protection in space- and power-constrained applications.
FAQ
What is the minimum output capacitor required for stable operation of NCP706MX21TAG?
The minimum output capacitor for stable operation of NCP706MX21TAG is 4.7 µF ceramic (X7R or X5R). This value is explicitly specified in the Applications Information section of the datasheet and validated across temperature and load conditions. Using less than 4.7 µF may cause instability or excessive output voltage ripple. Larger values improve PSRR and transient response but are not required for basic stability.
Does NCP706MX21TAG support remote voltage sensing, and how is it implemented?
Yes, NCP706MX21TAG supports remote voltage sensing via its dedicated SNS pin (Pin 4). The SNS pin must be connected directly to the load-side of the output rail to compensate for voltage drop across PCB traces. This configuration ensures ±1% regulation accuracy at the point-of-load, not just at the regulator's OUT pins - critical for high-current, low-voltage rails where trace resistance impacts performance.
What is the maximum input voltage the NCP706MX21TAG can tolerate, and what protection exists beyond that?
The absolute maximum input voltage for NCP706MX21TAG is 6 V, per the Absolute Maximum Ratings table. Operation above 5.5 V (recommended max) risks permanent damage. The device includes undervoltage lockout (UVLO) that disables regulation below ~1.2 V, but no overvoltage protection circuitry - external clamping or upstream protection is required if input transients exceed 6 V.
How does the enable (EN) pin function, and what happens if it's left unconnected?
The EN pin is active-high with thresholds of 0.9 V (turn-on) and 0.4 V (turn-off). If left unconnected, the internal leakage and parasitic paths may result in undefined state - potentially causing erratic startup or failure to enable. The datasheet explicitly recommends tying EN to VIN if unused. For controlled sequencing, drive EN with a clean GPIO or power-good signal meeting the specified voltage thresholds.
Can NCP706MX21TAG be used with tantalum output capacitors, and what are the risks?
NCP706MX21TAG is optimized for ceramic capacitors and explicitly warns against using tantalum capacitors with high ESR - doing so may cause loop oscillation and instability. While some low-ESR tantalum types *might* work under narrow conditions, the datasheet guarantees stability only with ≥4.7 µF ceramic (MLCC). For reliability and guaranteed performance, ceramic is the only recommended output capacitor type.
NCP706MX21TAG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-XFDFN 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):
- 2.1V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.3V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 230 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB ~ 40dB (100Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Soft Start, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-XDFN (1.6x1.2)
NCP706MX21TAG FAQ
1.How can I place an order for NCP706MX21TAG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP706MX21TAG 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 NCP706MX21TAG reliable?
The price and inventory of NCP706MX21TAG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP706MX21TAG is usually 5 days.
3.What payment methods are accepted for NCP706MX21TAG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP706MX21TAG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP706MX21TAG?
NCP706MX21TAG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP706MX21TAG 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 NCP706MX21TAG?
For technical support, including NCP706MX21TAG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP706MX21TAG requirements.
6.How does Aetrix verify that NCP706MX21TAG is sourced from the original manufacturer or authorized distributors?
All NCP706MX21TAG 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 NCP706MX21TAG meets industry standards.
7.What is the process for return or replacement of NCP706MX21TAG?
All NCP706MX21TAG units undergo pre-shipment inspection (PSI). If there is an issue with NCP706MX21TAG, 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 NCP706MX21TAG part is unused and in its original packaging.
Return procedure for NCP706MX21TAG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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