onsemi NCP700CMT45TBG

Overview

NCP700CMT45TBG from onsemi is a 200 mA ultra-low-noise, high-PSRR LDO regulator optimized for RF power amplifier supply in battery-powered portable devices. It delivers 4.5 V output with ±2.5% accuracy, 80 mV typical dropout at 200 mA, 10 µV_RMS output noise (10 Hz–100 kHz), and 70 dB PSRR at 1 kHz - enabling clean biasing of sensitive RF stages in smartphones and precision instrumentation.

For engineers reviewing the NCP700CMT45TBG datasheet, pinout, applications, or equivalent options, key selection criteria include its WDFN6 1.5 mm × 1.5 mm footprint, BYP-pin noise reduction capability, EN-controlled enable/disable function, and compatibility with low-ESR ceramic capacitors as small as 1 µF.

Technical Context

The NCP700CMT45TBG employs a BiCMOS process to integrate bipolar elements for ultra-low noise and CMOS for low ground current (70 µA typ. at no load). Its architecture features a dedicated BYP pin connected directly to the bandgap reference node, allowing external 10–100 nF capacitors to suppress noise before amplification by the error amplifier and PMOS pass device.

Regulation relies on a precision bandgap reference and high-gain error amplifier driving a PMOS pass transistor. Enable control is implemented via a logic-level EN pin with 0.4 V/1.2 V thresholds and an internal 5 MΩ pull-down resistor, supporting both active-high operation and simple tie-to-IN configuration for always-on use.

Key Specifications

Pinout & Package

Package: WDFN6 (Case 511BJ), 1.5 mm × 1.5 mm × 0.8 mm, exposed thermal pad, Pb-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP700CMT45TBG, the XC6210B452MR-G trades 25× higher output noise and 10 dB lower PSRR for lower unit cost in larger SOT-25 packaging, while the ADP160ACBZ-4.5-R7 matches PSRR and noise performance but limits max load to 150 mA in a non-pin-compatible TSOT-23 format.

Availability

NCP700CMT45TBG is available at Aetrix Electronics and suitable for smartphone RF power amplifiers, portable GPS receivers, battery-powered instrumentation, and noise-sensitive audio systems requiring stable component supply with guaranteed long-term manufacturability.

Supply support for NCP700CMT45TBG 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 NCP700CMT45TBG belongs to onsemi's high-performance LDO family designed specifically for RF and precision analog applications demanding ultra-low noise, high PSRR, and minimal footprint in portable electronics.

FAQ

What is the maximum input voltage rating for the NCP700CMT45TBG?

The NCP700CMT45TBG has an absolute maximum input voltage rating of 6 V. Operation above 5.5 V is not recommended, as the device may enter undefined behavior or experience accelerated degradation. The specified operating input range is 2.5 V to 5.5 V, ensuring full parametric compliance including dropout, regulation, and PSRR performance across temperature and load conditions. Exceeding 6 V risks permanent damage to the internal PMOS pass transistor and bandgap reference circuitry.

Does the NCP700CMT45TBG require a minimum load current for stability?

No, the NCP700CMT45TBG does not require a minimum load current for stability. Its internal compensation and BiCMOS architecture ensure stable operation from zero load up to 200 mA. This eliminates the need for dummy loads or bleeder resistors in battery-powered standby modes, preserving system efficiency. Stability is maintained with 1 µF ceramic output capacitors across the full temperature range (−40 °C to +125 °C), as verified in the datasheet's stability characterization.

How does the BYP pin reduce output noise in the NCP700CMT45TBG?

The BYP pin in the NCP700CMT45TBG provides direct access to the internal bandgap reference node - the dominant source of output noise. Connecting a 10–100 nF capacitor from BYP to GND shunts high-frequency noise currents away from the error amplifier input, reducing total integrated output noise from 23 µV_RMS (10 nF) to 10 µV_RMS (100 nF) in the 10 Hz–100 kHz band. This technique avoids degrading PSRR or transient response, unlike output-stage filtering.

What thermal considerations apply to the NCP700CMT45TBG in a 200 mA application?

At 200 mA with 4.5 V output and 5.0 V input, the NCP700CMT45TBG dissipates approximately 100 mW. With its WDFN6 package thermal resistance (Junction-to-Ambient) of 185 °C/W on a standard 1 oz FR4 board, this yields a junction temperature rise of ~18.5 °C above ambient. To maintain TJ ≤ 125 °C, ambient must stay below 106.5 °C. For sustained 200 mA operation, use ≥645 mm² copper area under the exposed pad and consider airflow or thermal vias to improve heat spreading.

Can the NCP700CMT45TBG be used without connecting the EN pin?

Yes, the NCP700CMT45TBG can be used without external EN control by connecting the EN pin directly to the IN pin. This leverages the internal 5 MΩ pull-down resistor to ensure reliable turn-on when VIN is applied, eliminating the need for external pull-up circuitry. In this configuration, the device powers up synchronously with the input rail and remains enabled as long as VIN is within specification. No additional components or logic sequencing are required for basic regulator operation.