onsemi NCP752AMX18TCG

Overview

NCP752AMX18TCG from onsemi is a 200 mA ultra-low-noise, ultra-low-quiescent-current LDO voltage regulator with fixed 1.8 V output, designed for noise-sensitive RF power stages in satellite radios and infotainment systems. It delivers ±2% output accuracy over load/line/temperature, 11.5 µV_RMS output noise (100 Hz–100 kHz), and 68 dB PSRR at 1 kHz - all without requiring an external noise-bypass capacitor.

For engineers reviewing the NCP752AMX18TCG datasheet, pinout, applications, or equivalent options, this page provides verified functional context, validated package mapping to XDFN-6 (1.5 × 1.5 mm), confirmed Power Good timing behavior (t_RD = 2 µs, t_RR = 2 µs), and real-world design implications of its auto low-power mode and active output discharge.

Technical Context

The NCP752AMX18TCG employs a PMOS pass transistor architecture enabling reverse-current blocking and ultra-low dropout (130 mV typical at 200 mA). Its internal bandgap reference feeds a precision error amplifier that drives the pass element while maintaining stability with only a 1 µF ceramic output capacitor.

It integrates dual-mode enable logic: EN < 0.4 V forces shutdown with 0.12 µA typical disable current, while EN > 0.9 V enables regulation and disables active discharge. The open-drain PG output asserts high when V_OUT reaches 92–96% of nominal and includes 2% hysteresis and 2 µs timeout delay - specific to the "A" variant per datasheet Table 4.

Key Specifications

Pinout & Package

Package: XDFN-6 (1.5 × 1.5 mm, 0.5 mm pitch, Case 711AE), thermally enhanced with exposed thermal pad. Pin 5 is NC (may be grounded for improved thermal dissipation).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Torex XC6210B182MR-G and Richtek RT9080AGQW, the NCP752AMX18TCG uniquely combines sub-15 µA quiescent current, 2 µs PG timing, and 11.5 µV_RMS noise in a 1.5 × 1.5 mm XDFN package - making it the only option qualified for RF power amplifier bias in space- and power-constrained portable systems.

Availability

NCP752AMX18TCG is available at Aetrix Electronics and suitable for satellite radio receivers, portable medical instrumentation, and Bluetooth® audio devices requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.

Supply support for NCP752AMX18TCG 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP752AMX18TCG belongs to onsemi's high-performance LDO family engineered specifically for ultra-low-noise, ultra-low-I_Q power delivery in battery-operated RF and precision analog systems - emphasizing clean regulation without external noise filters.

FAQ

What is the maximum input voltage rating for the NCP752AMX18TCG?

The NCP752AMX18TCG has an absolute maximum input voltage rating of 6 V. However, for reliable continuous operation, the recommended operating input voltage range is 2.0 V to 5.5 V. Exceeding 6 V risks permanent damage, and operation above 5.5 V voids parametric guarantees including dropout, PSRR, and thermal performance. The device includes undervoltage lockout (UVLO) that disables regulation below ~1.5 V typical.

Does the NCP752AMX18TCG require an external noise-bypass capacitor?

No, the NCP752AMX18TCG does not require an external noise-bypass capacitor to achieve its specified 11.5 µV_RMS output noise (100 Hz–100 kHz). This is enabled by its internal low-noise architecture and optimized bandgap/reference design. Adding a bypass capacitor provides no measurable improvement and may degrade stability if improperly selected - the datasheet explicitly confirms "no additional noise bypass capacitor" is needed.

How does the Power Good (PG) timing differ between NCP752A and NCP752B variants?

The NCP752AMX18TCG is the "A" variant, featuring PG timeout delay (t_RD) and reaction time (t_RR) both specified at 2 µs. In contrast, the "B" variant has t_RD = 200 µs and t_RR = 5 µs. This 100× faster timeout makes the NCP752AMX18TCG suitable for systems requiring immediate fault detection and fast reset assertion, such as RF transceivers and real-time sensor interfaces.

Can the NCP752AMX18TCG be used with a 0.5 µF output capacitor?

No - the minimum stable output capacitance for the NCP752AMX18TCG is 500 nF (0.5 µF), but the datasheet specifies 1.0 µF as the standard design value with full safety margin for DC bias, temperature, and tolerance variation. Using exactly 0.5 µF risks instability under worst-case conditions; the recommended minimum is 1.0 µF X5R/X7R ceramic with ESR < 700 mΩ.

What is the purpose of the NC pin (Pin 5) on the NCP752AMX18TCG XDFN-6 package?

Pin 5 on the NCP752AMX18TCG is a no-connect (NC) terminal - it is not electrically bonded to the die. Per the datasheet, it may be tied to GND to improve thermal conduction from the package to the PCB copper pour, enhancing power dissipation capability. Doing so introduces no electrical side effects and is a validated thermal relief technique for high-ambient or high-duty-cycle applications.