onsemi NCP702MX28TCG

Overview

NCP702MX28TCG from onsemi is a 200 mA ultra-low-noise, ultra-low-quiescent-current LDO voltage regulator with fixed 2.8 V output, 140 mV typical dropout at full load, ±2% output accuracy over temperature/load/line, and 11 µV_RMS integrated noise (100 Hz–100 kHz). It powers RF-sensitive circuitry such as PLLs, VCOs, and low-noise amplifiers in portable medical and wireless devices.

For engineers reviewing the NCP702MX28TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its adaptive ground current (10 µA typ. I_Q), no-bypass-capacitor noise performance, active output discharge, and compatibility with 1 µF ceramic output capacitors in space-constrained designs.

Technical Context

The NCP702MX28TCG employs a PMOS pass transistor architecture enabling true reverse-current blocking and eliminating external body-diode protection. Its internal bandgap reference and adaptive biasing deliver stable regulation across −40 °C to +125 °C while maintaining ultra-low noise via optimized internal filtering and no external bypass capacitor requirement.

Enable control uses a precision comparator with 0.9 V high-threshold and 0.4 V low-threshold, plus 2 mV hysteresis to prevent oscillation. Thermal shutdown activates at 160 °C with 20 °C hysteresis, and output current limiting is set to 385 mA (typ.) with short-circuit protection sustaining indefinite duration.

Key Specifications

Pinout & Package

Package: XDFN-6 (1.5 mm × 1.5 mm, 0.5 mm pitch, wettable flank), RoHS-compliant, Pb-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A0528PDBVR and MCP1700T-2802E/TT, the NCP702MX28TCG uniquely combines ultra-low noise (11 µV_RMS), ultra-low I_Q (10 µA), active output discharge, and XDFN-6 compactness - making it optimal for RF-critical, space-constrained, and sequenced-power portable designs.

Availability

NCP702MX28TCG is available at Aetrix Electronics and suitable for wireless transceivers, portable medical sensors, wearable subsystems, and low-power IoT edge nodes requiring stable component supply with guaranteed long-term sourcing.

Supply support for NCP702MX28TCG 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 leader focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.

The NCP702MX28TCG belongs to onsemi's high-performance LDO family designed specifically for noise-sensitive analog and RF subsystems in battery-powered portable electronics.

FAQ

What is the maximum input voltage rating for the NCP702MX28TCG?

The NCP702MX28TCG has an absolute maximum input voltage of 6 V, with recommended operating range from 2.0 V to 5.5 V. Operation above 5.5 V risks permanent damage, and the UVLO circuit disables regulation below ~1.5 V to prevent unstable output. The device is rated for continuous operation up to 5.5 V input across its full temperature range.

Does the NCP702MX28TCG require an external noise bypass capacitor?

No, the NCP702MX28TCG achieves 11 µV_RMS output noise (100 Hz–100 kHz) without any external noise bypass capacitor. Its internal architecture integrates low-noise biasing and filtering, eliminating the need for a separate 10 nF capacitor typically used with other LDOs - reducing BOM count and PCB area.

How does the active output discharge function work in the NCP702MX28TCG?

When the EN pin is driven below 0.4 V, the NCP702MX28TCG disables regulation and activates an internal 1 kΩ pull-down between OUT and GND. This discharges the output capacitor rapidly, ensuring V_OUT falls to near-zero within microseconds - critical for power sequencing in multi-rail systems and preventing back-powering of downstream circuitry.

What output capacitor is required for stable operation of the NCP702MX28TCG?

The NCP702MX28TCG is stable with a minimum 1.0 µF ceramic capacitor (X5R or X7R dielectric, ±10% tolerance) on the output. ESR must be < 700 mΩ; tantalum capacitors are not recommended due to high and temperature-variable ESR. Larger values (e.g., 4.7 µF or 10 µF) improve PSRR at higher frequencies but are not required for stability.

Is the NCP702MX28TCG pin-compatible with other variants in the NCP702 family?

Yes, all NCP702 variants in the XDFN-6 package - including NCP702MX28TCG - share identical pinout, footprint, and thermal pad layout. Fixed-output versions (e.g., 1.8 V, 2.5 V, 3.3 V) and adjustable variants use the same 1.5 mm × 1.5 mm XDFN-6 outline and pin assignments, enabling drop-in replacement during design iteration or voltage optimization.