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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi NCP4682HMU33TCG

Name: NCP4682HMU33TCG
Brand: onsemi
SKU: NCP4682HMU33TCG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP4682HMU33TCG

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 4-UDFN Exposed Pad

Datasheet:: NCP4682HMU33TCG.pdf

Description:: IC REG LINEAR 3.3V 150MA 4UDFN

Quantity:: RFQ Add To RFQ list

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Inventory:49,750

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Product details

Overview

NCP4682HMU33TCG from onsemi is a 150 mA, ultra-low-quiescent-current CMOS low-dropout linear regulator with 3.3 V fixed output, ±0.8% output voltage accuracy, and Chip Enable (active-high) functionality. It operates from 1.70 V to 5.25 V input, delivers 0.24 V dropout at 150 mA, and targets power-sensitive applications such as battery-powered IoT sensors and portable audio subsystems.

For engineers reviewing the NCP4682HMU33TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its 1.0 µA typical quiescent current, 0.1 µA standby current under CE = 0 V, ceramic-capacitor stability (≥0.1 µF), and UDFN4 1.0 × 1.0 mm package for space-constrained PCB layouts.

Technical Context

The NCP4682HMU33TCG implements a CMOS-based LDO architecture with integrated current-foldback protection and active-high enable control. Its internal reference and error amplifier deliver ±40 ppm/°C output voltage temperature coefficient and 0.02%/V line regulation, enabling stable biasing in thermally varying environments.

This variant belongs to the NCP4682 "Enable High" family (H-suffix), distinguishing it from auto-discharge (D-suffix) and NCP4685 "always-on" variants. It supports fast startup (<1 ms) and controlled shutdown via the CE pin, with no internal pull-up-requiring external VIN tie when unused.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3 V ±0.8% at 25°C; ensures reliable logic-level compatibility with 3.3 V microcontrollers and interfaces.
Quiescent Current	1.0 µA typical (excluding CE pull-down); enables multi-year operation on coin-cell batteries in always-listening sensor nodes.
Standby Current	0.1 µA at CE = 0 V; reduces system leakage during deep sleep modes without external MOSFET switching.
Dropout Voltage	0.24 V at I_OUT = 150 mA, V_OUT = 3.3 V; allows regulation from Li-ion single-cell (3.0–4.2 V) or 3.3 V rail with margin.
PSRR	30 dB at 1 kHz (VIN = 4.3 V, I_OUT = 30 mA); suppresses switching noise from upstream DC-DC converters feeding the LDO input.
Stability	Stable with ≥0.1 µF ceramic output capacitor; eliminates need for bulky tantalum or electrolytic capacitors in compact designs.
Operating Input Range	1.70 V to 5.25 V; supports direct connection to USB 5 V, regulated 3.3 V, or partially discharged 2-cell alkaline supplies.

Pinout & Package

Package: UDFN4 1.0 × 1.0 mm, 0.65 mm pitch, exposed thermal pad (GND-connected). Compact footprint ideal for wearables and edge-node modules.

Pin/Terminal	Circuit Role	Design Meaning
VIN (Pin 4)	Input supply connection	Accepts 1.70–5.25 V; requires local 0.1 µF ceramic decoupling placed adjacent to pin.
GND (Pin 2)	Ground reference and thermal path	Connected to exposed die pad; PCB thermal pad must be soldered to GND plane for R_JA = 250°C/W performance.
CE (Pin 3)	Chip Enable control (active-high)	Logic high (>1.5 V) enables regulation; logic low (<0.3 V) disables output and reduces I_Q to 0.1 µA.
VOUT (Pin 1)	Regulated output	Delivers 3.3 V ±0.8%; requires 0.1 µF ceramic capacitor directly between VOUT and GND for stability.

Key Features

Feature	Design Value
Ultra-low quiescent current	1.0 µA typical operating supply current enables >10-year battery life in 10 µA average-load IoT endpoints.
Active-high enable interface	CE pin accepts standard CMOS logic levels; no external pull-up required-simplifies host MCU GPIO control.
Current-foldback protection	Reduces output current and voltage during overload or short-circuit, preventing thermal runaway and enabling self-recovery.
High PSRR at 1 kHz	30 dB rejection of ripple from noisy switchers improves signal integrity in mixed-signal SoC power domains.
±40 ppm/°C tempco	Ensures <±10 mV drift over −40°C to +85°C ambient, critical for precision ADC references and analog sensor biasing.

Applications

Battery-Powered Wearables	Industrial Sensor Nodes
Use Scenario: Continuous heart-rate monitoring in wrist-worn fitness trackers powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 3.3 V supply for BLE SoC and optical sensor ASIC. Use Value: 1.0 µA quiescent current extends battery life beyond 2 years; 0.24 V dropout allows full utilization of cell voltage down to 3.0 V.	Use Scenario: Wireless vibration sensor node mounted on factory motor housing, operating unattended for 5+ years. IC Role / Device Role / Timing Role: Regulated 3.3 V source for MEMS accelerometer and sub-GHz RF transceiver. Use Value: ±40 ppm/°C tempco maintains ADC reference stability across −25°C to +70°C ambient; CE pin enables synchronized sleep/wake with MCU.
Portable Audio Accessories	Smart Home Edge Devices
Use Scenario: USB-C powered Bluetooth earbud charging case with integrated battery gauge and LED indicators. IC Role / Device Role / Timing Role: Clean 3.3 V rail for fuel-gauge IC and status LEDs during charging and standby. Use Value: 30 dB PSRR at 1 kHz suppresses 2 MHz DC-DC switching noise, eliminating audible buzz in audio amplifiers.	Use Scenario: Battery-backed Zigbee thermostat with LCD display and environmental sensors, deployed in HVAC ducts. IC Role / Device Role / Timing Role: Always-available 3.3 V supply for real-time clock and non-volatile memory during main power loss. Use Value: 0.1 µA standby current under CE = 0 V preserves backup battery charge for >3 months; UDFN4 footprint saves board area.

Battery-Powered Wearables

Industrial Sensor Nodes

Use Scenario: Continuous heart-rate monitoring in wrist-worn fitness trackers powered by CR2032 coin cell.

IC Role / Device Role / Timing Role: Primary 3.3 V supply for BLE SoC and optical sensor ASIC.

Use Value: 1.0 µA quiescent current extends battery life beyond 2 years; 0.24 V dropout allows full utilization of cell voltage down to 3.0 V.

Use Scenario: Wireless vibration sensor node mounted on factory motor housing, operating unattended for 5+ years.

IC Role / Device Role / Timing Role: Regulated 3.3 V source for MEMS accelerometer and sub-GHz RF transceiver.

Use Value: ±40 ppm/°C tempco maintains ADC reference stability across −25°C to +70°C ambient; CE pin enables synchronized sleep/wake with MCU.

Portable Audio Accessories

Smart Home Edge Devices

Use Scenario: USB-C powered Bluetooth earbud charging case with integrated battery gauge and LED indicators.

IC Role / Device Role / Timing Role: Clean 3.3 V rail for fuel-gauge IC and status LEDs during charging and standby.

Use Value: 30 dB PSRR at 1 kHz suppresses 2 MHz DC-DC switching noise, eliminating audible buzz in audio amplifiers.

Use Scenario: Battery-backed Zigbee thermostat with LCD display and environmental sensors, deployed in HVAC ducts.

IC Role / Device Role / Timing Role: Always-available 3.3 V supply for real-time clock and non-volatile memory during main power loss.

Use Value: 0.1 µA standby current under CE = 0 V preserves backup battery charge for >3 months; UDFN4 footprint saves board area.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700T-3302E/MB	3.3 V fixed, 250 mA, 1.6 µA I_Q, SOT-23-3 package, no enable pin	Lacks CE control; requires external FET for shutdown; higher quiescent current	Select when board space permits larger SOT-23 and enable functionality is unnecessary.
Torex XC6206P332MR-G	3.3 V fixed, 250 mA, 1.0 µA I_Q, SOT-25 package, CE pin (active-low)	Active-low CE requires level-shifting or inverted MCU GPIO; same quiescent current but different enable polarity	Choose when existing firmware uses active-low enable signals and SOT-25 footprint is acceptable.

Compared with MCP1700T-3302E/MB and XC6206P332MR-G, the NCP4682HMU33TCG offers identical quiescent current but adds active-high CE in a smaller UDFN4 package-reducing BOM count and PCB area while simplifying GPIO interface design.

Availability

NCP4682HMU33TCG is available at Aetrix Electronics and suitable for battery-powered wearables, industrial sensor nodes, and portable audio accessories requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP4682HMU33TCG 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 sensing technologies for automotive, industrial, and cloud infrastructure markets.

The NCP4682 series was designed specifically for ultra-low-power, space-constrained applications where extended battery life, precise voltage regulation, and minimal PCB footprint are critical-targeting next-generation IoT endpoints and portable electronics.

FAQ

What is the maximum input voltage rating for the NCP4682HMU33TCG?

The absolute maximum input voltage for the NCP4682HMU33TCG is 6.0 V. However, per the datasheet's Electrical Characteristics table, the recommended maximum operating input voltage is 5.25 V. Operation above 5.25 V is only permitted up to 5.50 V for ≤500 total hours, making 5.25 V the practical design limit for continuous use in the NCP4682HMU33TCG.

Does the NCP4682HMU33TCG require an external pull-up resistor on the CE pin?

No, the NCP4682HMU33TCG does not require an external pull-up on the CE pin. The device includes an internal CE pull-down current source (0.3 µA typical), so leaving CE unconnected defaults it to logic low (disable state). To enable regulation, drive CE to ≥1.5 V using a host MCU GPIO-no external resistor is needed for normal operation of the NCP4682HMU33TCG.

Can the NCP4682HMU33TCG be used with a 0.1 µF ceramic output capacitor?

Yes-the NCP4682HMU33TCG is explicitly characterized and guaranteed stable with a minimum 0.1 µF ceramic output capacitor, as stated in the Features list and Application Information section. This eliminates the need for larger or higher-ESR capacitors, simplifying layout and reducing cost in the NCP4682HMU33TCG design.

What is the thermal resistance (R_JA) of the NCP4682HMU33TCG in its UDFN4 package?

The junction-to-air thermal resistance (R_JA) for the NCP4682HMU33TCG in the UDFN4 1.0 × 1.0 mm package is 250°C/W, as specified in the Thermal Characteristics table. This value assumes proper PCB layout with the exposed thermal pad soldered to a GND plane; inadequate copper area will degrade thermal performance and reduce safe operating current in the NCP4682HMU33TCG.

How does the current-foldback protection behave in the NCP4682HMU33TCG during a short circuit?

Under short-circuit conditions, the NCP4682HMU33TCG activates current-foldback protection: output current decreases as output voltage collapses, limiting power dissipation and preventing thermal damage. Typical short-circuit current is 40 mA (per Electrical Characteristics), and the device self-recovers once the fault is removed-no latch-up or manual reset is required for the NCP4682HMU33TCG.

NCP4682HMU33TCG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: 4-UDFN Exposed Pad

Packaging:: Bulk

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.25V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.32V @ 150mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 1.5 µA

Current - Supply (Max):: -

PSRR:: 30dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 4-UDFN (1.0x1.0)

NCP4682HMU33TCG FAQ

1.How can I place an order for NCP4682HMU33TCG through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP4682HMU33TCG 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 NCP4682HMU33TCG reliable?

The price and inventory of NCP4682HMU33TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4682HMU33TCG is usually 5 days.

3.What payment methods are accepted for NCP4682HMU33TCG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4682HMU33TCG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP4682HMU33TCG?

NCP4682HMU33TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP4682HMU33TCG 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 NCP4682HMU33TCG?

For technical support, including NCP4682HMU33TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4682HMU33TCG requirements.

6.How does Aetrix verify that NCP4682HMU33TCG is sourced from the original manufacturer or authorized distributors?

All NCP4682HMU33TCG 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 NCP4682HMU33TCG meets industry standards.

7.What is the process for return or replacement of NCP4682HMU33TCG?

All NCP4682HMU33TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP4682HMU33TCG, 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 NCP4682HMU33TCG part is unused and in its original packaging.

Return procedure for NCP4682HMU33TCG:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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