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

onsemi NCP4632DDT33T5G

Name: NCP4632DDT33T5G
Brand: onsemi
SKU: NCP4632DDT33T5G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP4632DDT33T5G

Manufacturer:: onsemi

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

Package:: TO-252-6, DPAK (5 Leads + Tab)

Datasheet:: NCP4632DDT33T5G.pdf

Description:: IC REG LINEAR 3.3V 3A DPAK-5

Quantity:: RFQ Add To RFQ list

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Product details

Overview

NCP4632DDT33T5G from onsemi is a 3.3 V fixed-output, 3 A low-dropout linear voltage regulator with reverse current protection and active output discharge. It operates from 1.6 V to 5.25 V input, delivers ±1% output accuracy, maintains 510 mV typical dropout at full load, and draws only 350 µA quiescent current-optimized for battery-powered portable electronics requiring stable low-voltage rail generation.

For engineers reviewing the NCP4632DDT33T5G datasheet, pinout, applications, or equivalent options, key selection criteria include its DPAK-5 package thermal performance (R_JA = 53 °C/W), 3.3 V fixed output with soft-start and reverse-current limiting (<10 µA), CE-controlled enable/disable timing, and ceramic-capacitor stability without external compensation.

Technical Context

The NCP4632DDT33T5G integrates a CMOS pass transistor with precision bandgap reference, internal soft-start circuitry, and reverse-current detection that disables the output when V_OUT exceeds V_IN by >30 mV. Its active discharge path (N-channel MOSFET between V_OUT and GND) ensures rapid output capacitor discharge during disable, critical for power sequencing in multi-rail systems.

It employs current-foldback overcurrent protection (typ. 220 mA short-circuit limit), thermal shutdown, and line/load regulation of 0.15%/V and ≤50 mV respectively. The device achieves PSRR of 55 dB at 1 kHz and 60 µV_RMS output noise (10 Hz–100 kHz), supporting noise-sensitive analog and RF subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3 V ±1% at TJ = +25°C; ensures stable MCU core or I/O rail without external feedback components.
Max Output Current	3 A continuous; supports high-current digital loads like SoCs, FPGAs, or display drivers without external current boosting.
Dropout Voltage	510 mV typ. at 3 A, V_OUT = 3.3 V; enables operation from single-cell Li-ion (3.0–4.2 V) or 5 V bus with minimal headroom loss.
Quiescent Current	350 µA typ. in operation, 1 µA in standby; extends battery life in always-on or low-power sleep modes.
PSRR	55 dB at 1 kHz; suppresses ripple from noisy switching supplies upstream, reducing need for additional filtering stages.
Reverse Current Limit	<10 µA when V_OUT > V_IN; prevents backfeed into input sources during hot-swap or partial system power-down.
Enable Threshold	V_CEH = 1.0 V min., V_CEL = 0.4 V max.; compatible with 1.8 V/3.3 V logic-level microcontrollers for precise power control.

Pinout & Package

DPAK-5 (TO-252-5) package with exposed thermal pad (internally connected to Pin 3/GND); 5.40–6.30 mm × 9.50–10.20 mm footprint; JEDEC-standard 4-layer PCB thermal resistance R_JA = 53 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 - CE	Chip Enable Input	Active-high logic control; internal 300 nA pull-down allows direct connection to VIN if unused; enables fast turn-on/turn-off with defined timing (Fig. 34–37).
2 - VIN	Input Voltage Supply	Accepts 1.6–5.25 V; requires 10 µF ceramic decoupling placed adjacent to pin to minimize line transient overshoot.
3 - GND	Ground Reference	Power and signal ground; thermally connected to exposed tab; must be low-impedance plane for thermal dissipation and noise rejection.
4 - VOUT	Regulated Output	Delivers 3.3 V ±1%; connects to 10 µF ceramic output capacitor; active discharge path engages when CE = low.
5 - SENSE	Output Sense / Feedback	Fixed-output mode: senses VOUT directly for regulation; not adjustable-no external resistor divider required.

Key Features

Feature	Design Value
Reverse Current Protection	Automatically disables pass element when V_OUT > V_IN +30 mV, limiting reverse leakage to <10 µA-prevents backfeeding into input sources during partial power-down.
Active Output Discharge	Integrated N-ch MOSFET discharges VOUT capacitor rapidly upon disable (CE = low), eliminating hold-up voltage that could disrupt downstream sequencing or cause latch-up.
Soft-Start Circuitry	Controls output ramp rate during power-up to limit inrush current into large output capacitance, avoiding input supply sag or brown-out in battery-fed systems.
Ceramic Capacitor Stability	Stable with ≥10 µF X5R/X7R ceramic capacitors on input and output-eliminates need for tantalum or electrolytic caps, reducing board area and improving reliability.
Thermal Shutdown	Protects against sustained overload or poor heatsinking by disabling output when junction temperature exceeds 125°C; auto-recovery after cooldown.

Applications

Smartphone Baseband Power	Wearable Sensor Hub
Use Scenario: Powers baseband processor core rail (3.3 V) from shared PMIC output or single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary LDO delivering clean, sequenced 3.3 V supply with fast enable/disable controlled by AP. Use Value: Active discharge ensures no residual VOUT during sleep mode, preventing unintended wake-up or data corruption in memory interfaces.	Use Scenario: Supplies 3.3 V to ultra-low-power sensor fusion hub (accelerometer, gyroscope, BLE radio) in fitness tracker. IC Role / Device Role / Timing Role: Low-quiescent LDO maintaining regulated rail during deep-sleep states where system draws <10 µA. Use Value: 1 µA standby current extends battery life beyond 6 months; ±1% accuracy ensures consistent ADC reference and sensor biasing.
Industrial Handheld Terminal	USB-C Peripheral Power
Use Scenario: Provides 3.3 V for ARM Cortex-M microcontroller and RS-485 transceiver in ruggedized field device. IC Role / Device Role / Timing Role: Robust LDO with reverse-current blocking protects main 5 V bus from backfeed when external 3.3 V sensors are powered first. Use Value: Reverse current limit <10 µA prevents bus voltage droop during hot-plug events; thermal shutdown guards against enclosure overheating.	Use Scenario: Generates 3.3 V auxiliary rail from USB-C VBUS (5 V) for embedded controller and Type-C port manager IC. IC Role / Device Role / Timing Role: Compact, high-PSRR LDO rejecting switching noise from buck converter feeding VBUS. Use Value: 55 dB PSRR at 1 kHz suppresses VBUS ripple, ensuring clean power for USB PD communication and CC logic.

Smartphone Baseband Power

Wearable Sensor Hub

Use Scenario: Powers baseband processor core rail (3.3 V) from shared PMIC output or single-cell Li-ion battery.

IC Role / Device Role / Timing Role: Primary LDO delivering clean, sequenced 3.3 V supply with fast enable/disable controlled by AP.

Use Value: Active discharge ensures no residual VOUT during sleep mode, preventing unintended wake-up or data corruption in memory interfaces.

Use Scenario: Supplies 3.3 V to ultra-low-power sensor fusion hub (accelerometer, gyroscope, BLE radio) in fitness tracker.

IC Role / Device Role / Timing Role: Low-quiescent LDO maintaining regulated rail during deep-sleep states where system draws <10 µA.

Use Value: 1 µA standby current extends battery life beyond 6 months; ±1% accuracy ensures consistent ADC reference and sensor biasing.

Industrial Handheld Terminal

USB-C Peripheral Power

Use Scenario: Provides 3.3 V for ARM Cortex-M microcontroller and RS-485 transceiver in ruggedized field device.

IC Role / Device Role / Timing Role: Robust LDO with reverse-current blocking protects main 5 V bus from backfeed when external 3.3 V sensors are powered first.

Use Value: Reverse current limit <10 µA prevents bus voltage droop during hot-plug events; thermal shutdown guards against enclosure overheating.

Use Scenario: Generates 3.3 V auxiliary rail from USB-C VBUS (5 V) for embedded controller and Type-C port manager IC.

IC Role / Device Role / Timing Role: Compact, high-PSRR LDO rejecting switching noise from buck converter feeding VBUS.

Use Value: 55 dB PSRR at 1 kHz suppresses VBUS ripple, ensuring clean power for USB PD communication and CC logic.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TI TPS7A2033PDBVR	3.3 V fixed, 300 mA max, 65 µA IQ, SOT-23-5 package; lower current, smaller footprint, no active discharge.	Suitable for low-power MCU peripherals but insufficient for 3 A loads; lacks reverse-current blocking and thermal derating capability.	Select only for space-constrained, sub-500 mA applications where active discharge is unnecessary.
ROHM BD33IC0WEFJ-E2	3.3 V fixed, 500 mA max, 35 µA IQ, HTSOP-8 package; includes thermal shutdown but no CE pin or reverse-current protection.	Targeted at consumer audio/video; cannot replace NCP4632DDT33T5G in battery-powered systems requiring sequencing or backfeed prevention.	Use only in cost-sensitive, low-current applications where enable control and reverse protection are omitted.

Compared with TPS7A2033PDBVR and BD33IC0WEFJ-E2, the NCP4632DDT33T5G uniquely combines 3 A output, active discharge, reverse-current blocking, and DPAK-5 thermal performance-making it irreplaceable in high-current portable designs requiring robust power sequencing and battery safety.

Availability

NCP4632DDT33T5G is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor hubs, industrial handheld terminals, USB-C peripheral power, and battery-backed IoT edge nodes requiring stable component supply across production lifecycles.

Supply support for NCP4632DDT33T5G 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 NCP4632DDT33T5G belongs to onsemi's high-current LDO family designed specifically for battery-operated portable electronics demanding ultra-low quiescent current, reverse-current protection, and fast dynamic response in compact surface-mount packages.

FAQ

What is the maximum input voltage rating for the NCP4632DDT33T5G?

The absolute maximum input voltage for the NCP4632DDT33T5G is 6.0 V per the Absolute Maximum Ratings table. However, the recommended operating input voltage range is 1.6 V to 5.25 V. Operation above 5.25 V is permitted only up to 5.5 V for limited duration (≤500 hours total), as specified in Note 4 of the Electrical Characteristics section.

Does the NCP4632DDT33T5G require external compensation components?

No, the NCP4632DDT33T5G is internally compensated and stable with standard 10 µF ceramic input and output capacitors. The datasheet explicitly states it is "Stable with Ceramic Capacitors" and provides layout guidance for C1 and C2 placement-no external resistors, capacitors, or feedback networks are needed for the fixed 3.3 V version.

How does the active discharge function operate in the NCP4632DDT33T5G?

When the CE pin is driven low, the NCP4632DDT33T5G disables the main pass transistor and simultaneously turns on an internal N-channel MOSFET between VOUT and GND. This path discharges the output capacitor rapidly-critical for safe power-down sequencing. The discharge transistor has R_DS(on) ≤30 Ω (VIN = 4 V), enabling sub-millisecond discharge of typical 10–100 µF output caps.

What is the dropout voltage of the NCP4632DDT33T5G at 3 A output current?

At 3 A output current and TJ = +25°C, the typical dropout voltage of the NCP4632DDT33T5G is 510 mV when VOUT = 3.3 V. The datasheet specifies this value in the Features list and confirms it in the Electrical Characteristics table under "Dropout Voltage" test condition IOUT = 3000 mA and VOUT = 3.3 V.

Can the NCP4632DDT33T5G be used with input voltages below 1.6 V?

No-the NCP4632DDT33T5G has a minimum operating input voltage of 1.6 V, as stated in the Operating Input Voltage Range specification. Below this threshold, the device cannot maintain regulation or guarantee ±1% output accuracy. Attempting operation below 1.6 V may result in unregulated output or undefined behavior.

NCP4632DDT33T5G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-252-6, DPAK (5 Leads + Tab)

Packaging:: Tape & Reel (TR)

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):: 0.56V @ 3A

Current - Output:: 3A

Current - Quiescent (Iq):: 430 µA

Current - Supply (Max):: -

PSRR:: 55dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature, Reverse Polarity, Soft Start

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-252 (DPAK)

NCP4632DDT33T5G FAQ

1.How can I place an order for NCP4632DDT33T5G through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP4632DDT33T5G 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 NCP4632DDT33T5G reliable?

The price and inventory of NCP4632DDT33T5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4632DDT33T5G is usually 5 days.

3.What payment methods are accepted for NCP4632DDT33T5G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4632DDT33T5G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP4632DDT33T5G?

NCP4632DDT33T5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP4632DDT33T5G 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 NCP4632DDT33T5G?

For technical support, including NCP4632DDT33T5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4632DDT33T5G requirements.

6.How does Aetrix verify that NCP4632DDT33T5G is sourced from the original manufacturer or authorized distributors?

All NCP4632DDT33T5G 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 NCP4632DDT33T5G meets industry standards.

7.What is the process for return or replacement of NCP4632DDT33T5G?

All NCP4632DDT33T5G units undergo pre-shipment inspection (PSI). If there is an issue with NCP4632DDT33T5G, 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 NCP4632DDT33T5G part is unused and in its original packaging.

Return procedure for NCP4632DDT33T5G:

1.Submit a request within 90 days.

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

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