onsemi NCP163BFCS2925T2G

Overview

NCP163BFCS2925T2G from onsemi is a 250 mA ultra-low-noise, high-PSRR LDO regulator with fixed 2.925 V output, designed for RF and analog circuits in battery-powered devices. It delivers ±2% output accuracy over load/temperature, 80 mV dropout at 250 mA (XDFN4/WLCSP), 6.5 µV_RMS output noise (10 Hz–100 kHz), and 92 dB PSRR at 1 kHz - enabling clean power delivery to sensitive receivers and ADCs in smartphones and wireless LAN modules.

For engineers reviewing the NCP163BFCS2925T2G datasheet, pinout, applications, or equivalent options, key selection criteria include its non-active-discharge architecture, WLCSP4 0.64 mm × 0.64 mm × 0.4 mm package, 12 µA quiescent current, thermal shutdown at 160°C, and compatibility with 1 µF ceramic input/output capacitors.

Technical Context

The NCP163BFCS2925T2G employs a PMOS pass transistor with integrated soft-start and bandgap reference, delivering stable regulation without requiring external compensation. Its enable logic (VENH = 1.2 V, VENL = 0.4 V) controls activation while internal pull-down ensures default-off behavior when EN is floating.

Unlike the "A" version, this "B" variant omits active output discharge - disabling the 280 Ω discharge path during shutdown - making it suitable for systems where uncontrolled VOUT discharge could interfere with sequencing or cause back-powering of upstream circuitry.

Key Specifications

Pinout & Package

Package: WLCSP4 (Case 567XW), 0.64 mm × 0.64 mm × 0.4 mm, Pb-free, halogen-free, RoHS-compliant. Exposed pad (EPAD) tied to GND for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP163AFCS2925T2G, the NCP163BFCS2925T2G avoids unintended discharge-induced transients in sequenced power domains; compared with TPL7407LDRVR, it delivers superior noise/PSRR for RF/analog use but offers single-rail simplicity and discrete enable control.

Availability

NCP163BFCS2925T2G is available at Aetrix Electronics and suitable for smartphone RF modules, wireless LAN transceivers, and medical wearable analog signal chains requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP163BFCS2925T2G 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 NCP163 product line targets ultra-low-noise, high-PSRR power regulation for RF and precision analog circuits - specifically engineered to replace legacy LDOs in next-generation mobile and wireless infrastructure where spectral purity and battery efficiency are critical.

FAQ

What is the output voltage tolerance of the NCP163BFCS2925T2G over temperature and load?

The NCP163BFCS2925T2G maintains ±2% output voltage accuracy across −40°C to +125°C junction temperature and 0–250 mA load current, as specified in the Electrical Characteristics table under VIN = VOUT(NOM) + 1 V conditions. This tolerance applies to the WLCSP4 and XDFN4 packages; SOT23−5L retains ±2% for all outputs including 2.925 V.

Does the NCP163BFCS2925T2G support active output discharge?

No, the NCP163BFCS2925T2G does not support active output discharge. The "B" suffix denotes the non-active-discharge variant - unlike the "A" version (e.g., NCP163AFCS2925T2G), it omits the internal 280 Ω discharge path. During shutdown, VOUT remains floating unless externally discharged.

What is the minimum recommended output capacitor for stable operation of the NCP163BFCS2925T2G?

The NCP163BFCS2925T2G is designed to remain stable with a minimum effective output capacitance of 0.7 µF (accounting for DC bias and temperature derating). A 1 µF X7R or X5R ceramic capacitor placed adjacent to the OUT pin is recommended for optimal transient response and PSRR performance.

Can the NCP163BFCS2925T2G operate from a 2.5 V input when regulating 2.925 V?

No, the NCP163BFCS2925T2G cannot regulate 2.925 V from a 2.5 V input. Its operating input voltage range is 2.2 V to 5.5 V, but the dropout voltage at 250 mA is ≥95 mV for 2.8 V output and ≥80 mV for 3.3 V output. To achieve 2.925 V output, VIN must be ≥3.025 V (2.925 V + 100 mV typical dropout) under full load.

What thermal resistance values apply to the NCP163BFCS2925T2G in its WLCSP4 package?

In the WLCSP4 package (Case 567XW), the NCP163BFCS2925T2G has a junction-to-ambient thermal resistance (R_JA) of 108°C/W when mounted on a JEDEC-standard test board. Actual R_JA depends on PCB copper area and thickness - Figure 50 shows R_JA dropping to ~90°C/W with 600 mm² of 2 oz copper.