onsemi NCP4632DDT15T5G

Overview

NCP4632DDT15T5G from onsemi is a 3 A, low-dropout linear voltage regulator with fixed 1.5 V output, reverse current protection, and active discharge functionality. It operates from 1.6 V to 5.25 V input, delivers ±1% output accuracy, maintains 150 mV typical dropout at 1 A, and draws only 350 µA quiescent current-ideal for portable battery-powered systems requiring stable low-voltage rail generation.

For engineers reviewing the NCP4632DDT15T5G datasheet, pinout, applications, or equivalent options, key selection criteria include its DPAK-5 package thermal performance (R_JA = 53 °C/W), 1.5 V fixed output with soft-start and reverse-current blocking (<10 µA), and compatibility with ceramic output capacitors without external compensation.

Technical Context

The NCP4632DDT15T5G integrates a CMOS pass transistor with precision bandgap reference, internal soft-start circuitry, and dedicated reverse-current detection that disables the output stage 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 shutdown.

Thermal foldback and current-limit protection (220 mA short-circuit limit) operate independently of load conditions. Line regulation is 0.15%/V typical, and PSRR reaches 55 dB at 1 kHz-enabling clean power delivery in noise-sensitive analog and RF subsystems.

Key Specifications

Pinout & Package

Package: DPAK-5 (TO-252-5), Pb-free, thermally enhanced with exposed tab internally connected to GND (Pin 3). Mounting pad required for thermal management per JEDEC standard board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Compared with NCP4632BDT15T5G, the NCP4632DDT15T5G adds active discharge for controlled shutdown, while TPL7407LDR offers integrated switching but lacks the 3 A capability and precision regulation of the NCP4632DDT15T5G.

Availability

NCP4632DDT15T5G is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, and battery-powered imaging equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for NCP4632DDT15T5G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP4632 series belongs to onsemi's high-performance LDO portfolio, engineered specifically for battery-constrained portable electronics needing ultra-low quiescent current, reverse-current blocking, and robust thermal behavior in compact surface-mount packages.

FAQ

What is the maximum input voltage rating for the NCP4632DDT15T5G?

The absolute maximum input voltage for the NCP4632DDT15T5G is 6.0 V. However, the recommended operating range is 1.6 V to 5.25 V per datasheet specifications. Operation above 5.25 V is permitted only up to 500 hours total lifetime and must remain below 5.5 V-exceeding these limits risks reliability degradation or permanent damage to the NCP4632DDT15T5G.

Does the NCP4632DDT15T5G require an external resistor divider to set its output voltage?

No. The NCP4632DDT15T5G is a fixed-output variant delivering 1.5 V without external components. Its SENSE pin is internally connected to VOUT, eliminating the need for resistive feedback networks. This contrasts with adjustable versions like NCP4632DDTADJT5G, which require R1/R2 dividers-making the NCP4632DDT15T5G simpler to implement and more immune to layout-induced drift.

How does the active discharge feature function in the NCP4632DDT15T5G?

When the CE pin is driven low, the NCP4632DDT15T5G disables its main pass element and simultaneously turns on an internal N-channel MOSFET between VOUT and GND. This provides a low-resistance discharge path (R_LOW = 30 Ω typical), rapidly depleting stored charge in the output capacitor-critical for safe multi-rail sequencing and preventing unintended wake-up in downstream circuitry powered by the NCP4632DDT15T5G.

Can the NCP4632DDT15T5G operate stably with a 10 µF ceramic output capacitor?

Yes. The NCP4632DDT15T5G is explicitly characterized and guaranteed stable with 10 µF X5R/X7R ceramic capacitors (ESR < 10 mΩ), unlike many older LDOs requiring higher-ESR tantalum or aluminum types. This eliminates capacitor-related aging effects and reduces board area-confirmed in Figure 12 and Application Information section of the NCP4632DDT15T5G datasheet.

What thermal derating applies to the NCP4632DDT15T5G at 3 A load in still air?

With R_JA = 53 °C/W and a maximum junction temperature of 125°C, the NCP4632DDT15T5G dissipates 1.5 V × 3 A = 4.5 W at full load. In still air on a standard JEDEC 4-layer board, this yields a ~239°C rise-exceeding thermal limits. Therefore, the NCP4632DDT15T5G requires a minimum 4 cm² copper pour under the exposed tab and airflow ≥1 m/s to sustain 3 A continuously; derating to ~1.8 A is typical for unassisted PCB layouts.