onsemi NCP186BMX175TAG

Overview

NCP186BMX175TAG from onsemi is a 1 A CMOS low-dropout (LDO) regulator with fixed 1.75 V output, 1.8 V to 5.5 V input range, and 100 mV typical dropout at 1 A (V_OUT = 3.0 V). It features ±1% output voltage accuracy, 90 µA typical quiescent current, thermal shutdown at 165°C, and operates in the XDFN8 1.2×1.6 mm package without output discharge functionality. It powers noise-sensitive analog circuitry in portable image sensors.

For engineers reviewing the NCP186BMX175TAG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance at 1.75 V output, stability with 1 µF ceramic capacitors, EN pin logic thresholds (1.0 V high / 0.4 V low), and thermal resistance of 111 °C/W in XDFN8 packaging.

Technical Context

The NCP186BMX175TAG implements a PMOS pass transistor architecture enabling ultra-low dropout and reverse-current protection via its inherent body diode. Its adaptive ground current design achieves 90 µA quiescent current at no load while maintaining fast transient response-critical for powering image sensor pixel arrays during burst readout.

It integrates a 0.7 V internal reference, soft-start circuitry to suppress inrush current, and over-current protection that limits output to 1.4 A typ. The absence of active output discharge (B-version) simplifies bias sequencing in systems where controlled discharge is unnecessary or handled externally.

Key Specifications

Pinout & Package

Package: XDFN8 1.2 mm × 1.6 mm, 0.4 mm pitch, exposed pad (EPAD) recommended to be connected to GND for thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A20175PDBVR and MCP1826T-175I/OT, the NCP186BMX175TAG delivers superior thermal protection (165°C + 20°C hysteresis), smaller XDFN8 footprint (1.2×1.6 mm), and optimized dropout for 1.75 V output-making it ideal for thermally constrained, noise-sensitive portable imaging systems.

Availability

NCP186BMX175TAG is available at Aetrix Electronics and suitable for mobile image sensors, portable medical imaging devices, and wearable biometric sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP186BMX175TAG 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 NCP186 series is designed specifically for portable, battery-powered equipment demanding ultra-low noise, fast transient response, and minimal dropout-targeting image sensors, audio codecs, and precision analog subsystems.

FAQ

What is the maximum input voltage rating for the NCP186BMX175TAG?

The NCP186BMX175TAG has an absolute maximum input voltage rating of 6.0 V. Operation above this level risks permanent damage. For reliable continuous operation, the recommended input range is 1.8 V to 5.5 V per the datasheet's operating conditions. This range ensures optimal dropout performance, thermal stability, and output accuracy across temperature. The NCP186BMX175TAG must not be subjected to input transients exceeding 6.0 V, even briefly, unless externally clamped.

Does the NCP186BMX175TAG include output discharge functionality?

No, the NCP186BMX175TAG does not include output discharge functionality. The "B" suffix explicitly denotes the version without active discharge, unlike the "A" variant (e.g., NCP186AMX175TAG). When disabled via the EN pin, the NCP186BMX175TAG disconnects the pass transistor but leaves the output floating. External discharge circuitry is required if rapid V_OUT decay is needed during shutdown sequences.

What is the minimum output capacitance required for stability with the NCP186BMX175TAG?

The NCP186BMX175TAG is stable with a minimum effective output capacitance of 0.8 µF. However, the datasheet recommends using 1.0 µF ceramic (X7R or X5R) for optimal dynamic performance, including load transient response and PSRR. Capacitor selection must account for DC bias derating-especially with small-package types like 0201-where effective capacitance can drop significantly at 1.75 V bias. The NCP186BMX175TAG does not require ESR, but ESR should remain below 0.5 Ω.

How does the enable pin (EN) behave during power-up for the NCP186BMX175TAG?

The EN pin of the NCP186BMX175TAG has an internal 150 nA pull-down current source, ensuring the device remains disabled (high-impedance output) when the pin is left floating. To enable regulation, EN must be driven above 1.0 V (typical threshold); regulation begins within microseconds, with V_OUT reaching 98% of 1.75 V in time dependent on C_OUT and load. The NCP186BMX175TAG does not require external pull-up resistors unless interfacing with open-drain logic.

What thermal resistance value applies to the NCP186BMX175TAG in its XDFN8 package?

The NCP186BMX175TAG in the XDFN8 1.2×1.6 mm package has a junction-to-air thermal resistance (θ_JA) of 111 °C/W when mounted on a standard JEDEC test board. This value assumes minimal copper area; actual θ_JA improves significantly with larger GND pours connected to the EPAD and N/C pins. With 2 oz copper and 200 mm² thermal pad area, θ_JA can reach ~85 °C/W. The NCP186BMX175TAG's 165°C thermal shutdown provides margin before reaching this limit under 1 A load at ambient temperatures up to 85°C.