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onsemi NCP3985SN30T1G
- Part No.:
- NCP3985SN30T1G
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
NCP3985SN30T1G.pdf
- Description:
- IC REG LINEAR 3V 150MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,413
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Product details
Overview
NCP3985SN30T1G from onsemi is a 150 mA, 3.0 V fixed-output ultra-low dropout linear regulator using BiCMOS process technology; it delivers 70 dB PSRR at 1 kHz, 20 µVrms output noise (with 100 nF Cnoise), and 100 mV dropout at 150 mA load - designed for noise-sensitive analog power supplies in portable battery-operated systems.
For engineers reviewing the NCP3985SN30T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its TSOP-5 package compatibility, active discharge circuit for fast turn-off, ±3% output voltage tolerance over load/temperature, and stable operation with 1 µF ceramic output capacitors.
Technical Context
The NCP3985SN30T1G integrates a bandgap reference, error amplifier, and PMOS pass device in a BiCMOS process to achieve low noise and high PSRR while maintaining ground current as low as 70 µA at 1 mA load. Its Cnoise pin provides direct access to the internal reference node for external capacitor-based noise filtering.
It features logic-controlled enable (CE) with 0.4 V/1.2 V thresholds, thermal shutdown at 150 °C with 20 °C hysteresis, and current limit protection set to 200 mA minimum. The device enters sleep mode drawing ≤1 µA when CE is grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V ±3% over –40°C to +85°C and 1–150 mA load - ensures stable rail for precision analog circuits. |
| Dropout Voltage | 100 mV at 150 mA - enables regulation down to Vin = 3.1 V, critical for single-cell Li-ion or Li-poly battery systems. |
| PSRR | 70 dB at 1 kHz - suppresses switching noise from adjacent DC-DC converters feeding mixed-signal subsystems. |
| Output Noise | 20 µVrms (10 Hz–100 kHz, 100 nF Cnoise) - meets low-noise requirements for RF receivers and audio codecs. |
| Ground Current | 70 µA at 1 mA load; 220 µA at 150 mA - minimizes quiescent power loss in always-on sensor nodes. |
| Enable Threshold | CE low ≤0.4 V disables regulator; CE high ≥1.2 V enables - compatible with 1.8 V/3.3 V GPIO without level-shifting. |
| Stability | Stable with 1 µF ceramic output capacitor (X7R, 0805) - eliminates need for bulky tantalum or electrolytic caps. |
Pinout & Package
Package: TSOP-5 (3.00 × 1.50 × 0.95 mm, 0.95 mm pitch, Pb-free), case 483.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Power input | Accepts 2.5–5.5 V input; must be decoupled with ≥0.1 µF ceramic capacitor close to pin. |
| 2 - GND | Power ground | Common return path for input/output currents and Cnoise; requires low-inductance PCB connection. |
| 3 - CE | Chip enable control | Logic-level input; internal 5 MΩ pull-down allows tie-to-Vin for always-on operation or GPIO control. |
| 4 - Cnoise | Noise reduction node | Direct connection to internal bandgap reference; 10–100 nF capacitor to GND reduces output noise by up to 5 µVrms. |
| 5 - Vout | Regulated output | Delivers 3.0 V ±3% at up to 150 mA; supports active discharge via internal transistor when CE is low. |
Key Features
| Feature | Design Value |
|---|---|
| Active discharge circuit | Forces rapid Vout discharge on disable - prevents floating supply rails during power sequencing in multi-rail systems. |
| Low sleep-mode current | ≤1 µA quiescent draw in disabled state - extends battery life in intermittently active IoT endpoints. |
| Thermal shutdown with hysteresis | Triggers at 150 °C (typ), releases at 130 °C (typ) - prevents thermal cycling damage during sustained overload. |
| Current limit protection | 200 mA minimum trip threshold - safeguards against short-circuit faults without external current-sense components. |
| BiCMOS process architecture | Combines bipolar low-noise gain stages with CMOS low-IQ biasing - achieves 20 µVrms noise and 70 µA IQ simultaneously. |
Applications
| Cellular RF Front-End Power | Noise-Sensitive Audio Codec Supply |
|---|---|
Use Scenario: Powers low-noise amplifiers (LNAs) and mixer bias circuits in 4G/5G handset transceivers where supply ripple directly impacts EVM and ACLR. IC Role / Device Role / Timing Role: Ultra-low-noise LDO providing clean 3.0 V bias rail independent of noisy system DC-DC outputs. Use Value: 20 µVrms noise and 70 dB PSRR at 1 kHz prevent AM-to-PM conversion and phase noise degradation in RF signal chains. | Use Scenario: Supplies ADC/DAC reference buffers and headphone amplifier stages in portable media players requiring THD+N < –95 dB. IC Role / Device Role / Timing Role: Precision analog voltage regulator delivering stable 3.0 V with minimal spectral contamination. Use Value: Cnoise-tuned noise performance enables direct use with high-resolution audio ICs without additional LC filtering. |
| Battery-Fed Sensor Node Core Supply | GPS Receiver Baseband Power |
Use Scenario: Powers microcontroller core, precision op-amps, and 24-bit sigma-delta ADCs in industrial wireless sensor nodes operating from coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Micropower LDO enabling long-term operation with sub-µA sleep current and fast wake-up via CE control. Use Value: 1 µA disable current and 0.4 ms turn-on time support duty-cycled sensing with <1 µA average system IQ. | Use Scenario: Supplies GPS baseband processor and correlator circuits where supply-induced jitter degrades time-to-first-fix (TTFF) and position accuracy. IC Role / Device Role / Timing Role: Low-dropout regulator maintaining 3.0 V rail during cold-start battery voltage sag (down to 3.1 V). Use Value: 100 mV dropout at 150 mA ensures uninterrupted operation during peak correlation bursts even as battery discharges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP3985MFX-3.0/NOPB | Same pinout, identical electrical specs except 25 µVrms noise (vs. 20 µVrms); no Cnoise pin - uses internal compensation only. | Lacks external noise-reduction capability; less suitable for ultra-low-noise designs requiring <20 µVrms. | Select LP3985MFX-3.0/NOPB only if board layout cannot accommodate Cnoise capacitor or if legacy design reuse is required. |
| MCP1703T-3002E/MB | 300 mA rated, 600 mV max dropout, 45 µVrms noise, SOT-23-5 package - higher IQ (2.5 µA min) and no active discharge. | Higher dropout and noise limit use in battery-sag scenarios and RF/analog sections requiring tighter noise budgets. | Choose MCP1703T-3002E/MB only when higher output current headroom is needed and noise/PSRR requirements are relaxed. |
Compared with LP3985MFX-3.0/NOPB and MCP1703T-3002E/MB, the NCP3985SN30T1G uniquely combines 20 µVrms noise, 100 mV dropout, active discharge, and Cnoise tuning - making it optimal for space-constrained, battery-powered RF and precision analog systems where both noise and efficiency are co-constrained.
Availability
NCP3985SN30T1G is available at Aetrix Electronics and suitable for cellular telephony RF front-ends, portable audio codec supplies, and battery-fed sensor node core power requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for NCP3985SN30T1G 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, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP3985SN30T1G belongs to onsemi's micropower LDO family engineered specifically for noise-critical, battery-constrained portable electronics - emphasizing ultra-low dropout, high PSRR, and integrated power-control features like active discharge and logic-enable.
FAQ
What is the maximum input voltage rating for the NCP3985SN30T1G?
The NCP3985SN30T1G has an absolute maximum input voltage (Vin) rating of 6 V. Operation above this value risks permanent damage. For reliable continuous operation, the recommended input range is 2.5 V to 5.5 V - ensuring proper regulation while maintaining 100 mV dropout margin at full 150 mA load for the 3.0 V output version.
Does the NCP3985SN30T1G require an external capacitor on the Cnoise pin?
Yes, the NCP3985SN30T1G requires a capacitor (10 nF to 100 nF) connected between the Cnoise pin and GND to achieve specified noise performance. Without it, output noise rises to 25 µVrms; with 100 nF, noise drops to 20 µVrms. This capacitor directly filters the internal bandgap reference node - a key differentiator from standard LDOs lacking this feature.
Can the NCP3985SN30T1G be used without connecting the CE pin?
Yes, the NCP3985SN30T1G can operate without external CE control: connect CE to Vin to enable the device permanently. An internal 5 MΩ pull-down resistor ensures safe default-off behavior if CE is left floating, but intentional tie-to-Vin eliminates startup delay and simplifies designs where enable control is unnecessary.
What is the thermal shutdown behavior of the NCP3985SN30T1G?
The NCP3985SN30T1G activates thermal shutdown at approximately 150 °C junction temperature and remains latched off until die temperature falls to ~130 °C due to 20 °C hysteresis. During shutdown, the output is disabled and the active discharge circuit is inactive - requiring external reset or power cycle to restore operation after cooling.
Is the NCP3985SN30T1G stable with zero-ESR ceramic capacitors?
Yes, the NCP3985SN30T1G is explicitly designed for stability with low-ESR ceramic capacitors down to 1 µF, including X7R types in 0805 package. Unlike many LDOs requiring minimum ESR for phase margin, its internal compensation eliminates ESR dependency - verified across 0.01 Ω to 10 Ω ESR per Figure 23 in the datasheet.
NCP3985SN30T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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):
- 3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.15V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- 220 µA
- PSRR:
- 70dB ~ 55dB (120Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
NCP3985SN30T1G FAQ
1.How can I place an order for NCP3985SN30T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP3985SN30T1G 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 NCP3985SN30T1G reliable?
The price and inventory of NCP3985SN30T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP3985SN30T1G is usually 5 days.
3.What payment methods are accepted for NCP3985SN30T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP3985SN30T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP3985SN30T1G?
NCP3985SN30T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP3985SN30T1G 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 NCP3985SN30T1G?
For technical support, including NCP3985SN30T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP3985SN30T1G requirements.
6.How does Aetrix verify that NCP3985SN30T1G is sourced from the original manufacturer or authorized distributors?
All NCP3985SN30T1G 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 NCP3985SN30T1G meets industry standards.
7.What is the process for return or replacement of NCP3985SN30T1G?
All NCP3985SN30T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP3985SN30T1G, 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 NCP3985SN30T1G part is unused and in its original packaging.
Return procedure for NCP3985SN30T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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