onsemi NCP6323DMTAATBG

Overview

NCP6323DMTAATBG from onsemi is a synchronous buck converter IC optimized for portable subsystem power delivery, supporting 2.5 V–5.5 V input (e.g., single-cell Li-ion), delivering up to 2 A at externally adjustable 0.6 V–V_IN output, with 3 MHz fixed-frequency PWM operation and integrated high-side/low-side MOSFETs in a 2.0 × 2.0 mm WDFN8 package.

For engineers reviewing the NCP6323DMTAATBG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal shutdown behavior (170 °C), power-good timing (1.15 ms startup delay), soft-start ramp profile (0.32 ms typical), and validated layout guidance for high-efficiency point-of-load designs.

Technical Context

The NCP6323DMTAATBG employs input-voltage feedforward control to maintain regulation across its full 2.5 V–5.5 V input range while operating at a fixed 3 MHz switching frequency. Its PWM mode uses cycle-by-cycle current limiting (2.8 A typical peak) and synchronous rectification with integrated 130 mΩ high-side and 100 mΩ low-side MOSFETs (at V_IN = 5 V).

It features an open-drain power-good (PG) output with 90% V_FB threshold and 5% hysteresis, active output discharge via internal 500 Ω SW-to-PGND resistor when disabled, and EN logic with 1.1 V high-threshold and 270 mV hysteresis - all implemented in a thermally enhanced WDFN8 package with exposed pad soldered to system ground.

Key Specifications

Pinout & Package

Package: WDFN8 (2.0 × 2.0 × 0.75 mm, 0.5 mm pitch, exposed thermal pad), Case 511BE, Pb-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with MP2143GJ-Z and TPS62231DRYR, the NCP6323DMTAATBG uniquely combines 2 A capability, 3 MHz operation, power-good output, and active discharge in a 2.0 × 2.0 mm WDFN8 package - making it optimal for compact, battery-sensitive portable subsystems requiring coordinated power sequencing and rapid rail discharge.

Availability

NCP6323DMTAATBG is available at Aetrix Electronics and suitable for smartphone application processor core rails, USB-powered IoT sensor hubs, digital still camera image sensor bias, and portable media player audio codec rails requiring stable component supply and long-term production continuity.

Supply support for NCP6323DMTAATBG 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP6323DMTAATBG belongs to onsemi's high-frequency synchronous buck converter product line, designed specifically for space-constrained portable electronics requiring efficient, low-ripple, and sequenced power delivery from single-cell batteries or USB sources.

FAQ

What is the recommended inductor value for NCP6323DMTAATBG in a 1.8 V @ 2 A application?

The NCP6323DMTAATBG datasheet specifies a typical 1.0 µH inductor for 1.8 V output at 2 A. This value balances 20–50% peak-to-peak inductor current ripple, transient response, and physical size. Inductor saturation current must exceed 2.8 A (ILIM_P), and DCR should be minimized for efficiency. Murata LQH44PN1R0NP0 (1.0 µH, 2.95 A) is a validated option per Table 1.

Does NCP6323DMTAATBG support automatic power sequencing with other onsemi PMICs?

The NCP6323DMTAATBG supports controlled sequencing via its EN pin (1.1 V threshold) and PG output (open-drain, 90% V_FB trip). While it does not include I²C or dedicated sequencing logic, its EN/PG interface enables daisy-chained or FPGA-controlled sequencing with other rails. No built-in multi-rail coordination protocol is present.

What is the maximum allowable output capacitance for NCP6323DMTAATBG?

The NCP6323DMTAATBG does not specify a hard upper limit for output capacitance, but stability depends on loop compensation. The internal compensation is optimized for 10 µF ceramic output caps. Larger values (e.g., 22 µF) are acceptable if combined with appropriate feedback capacitor C_fb (e.g., 27 pF per Table 4) to maintain phase margin above 45°.

Is NCP6323DMTAATBG pin-compatible with NCP6323BMTAATBG?

Yes - both NCP6323DMTAATBG and NCP6323BMTAATBG share identical WDFN8 pinout, package dimensions, and terminal assignments. They differ only in soft-start timing (0.32 ms vs. 0.18 ms) and minor internal trimming; no PCB layout change is needed when substituting between these variants.

How does the active discharge function operate in NCP6323DMTAATBG during shutdown?

When EN is pulled low, the NCP6323DMTAATBG activates an internal ~500 Ω resistor between SW and PGND, discharging the output capacitor through the inductor and switch node. This ensures V_OUT falls rapidly (<10 ms typical for 10 µF), preventing unintended operation of downstream circuitry during power-down sequences.