onsemi NCV8855BMNR2G

Overview

NCV8855BMNR2G from onsemi is an automotive-grade quad-output system power supply IC integrating a 2 A high-side load switch, one SMPS buck controller, one 2.5 A SMPS buck regulator with internal 300 mΩ NMOS, and two LDO controllers - all operating from 9–18 V input. It powers tuner, CD logic, audio processor, TFT display, flash memory, and CAN transceivers in car radios and instrument clusters.

For engineers reviewing the NCV8855BMNR2G datasheet, pinout, applications, or equivalent options, key selection considerations include its 170 kHz fixed switching frequency with SYNC capability, thermal warning flag (HOT_FLG), independent enable pins (SYS_EN/LDO_EN/HS_EN), and integrated current-sense protection across all outputs.

Technical Context

The NCV8855BMNR2G implements voltage-mode control for both SMPS channels, with dedicated COMP1/COMP2 error amplifier outputs and external compensation via SW_FB1/SW_FB2. Its SMPS1 uses external high-side/low-side NMOS FETs, while SMPS2 integrates a 300 mΩ NMOS switch rated for 2.5 A continuous output.

Each LDO controller drives external P-channel MOSFET pass devices with adjustable output voltage, current limiting (90–130 mV sense threshold), short-circuit protection, and thermal monitoring. The high-side switch features programmable current limit (2.0–3.64 A), overvoltage clamping (15.4–16.6 V), and latched shutdown on sustained overload.

Key Specifications

Pinout & Package

NCV8855BMNR2G is housed in a 40-pin QFN package (6 mm × 6 mm, MN suffix, Case 488AR) with exposed thermal pad (EP) connected to PCB ground for enhanced thermal dissipation (R_JA = 36 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive multi-rail power management applications.

Compared with MPQ4333-AEC1 and TPS65381A-Q1, the NCV8855BMNR2G offers unique integration of HSS + dual LDO controllers + buck controller + buck regulator in one package, enabling simpler layout and deterministic thermal response via HOT_FLG - critical for cost-sensitive, ASIL-A automotive modules without MCU supervision.

Availability

NCV8855BMNR2G is available at Aetrix Electronics and suitable for automotive radio, instrument cluster, and driver information system applications requiring stable component supply across extended temperature ranges (−40°C to +105°C ambient) and long product lifecycles.

Supply support for NCV8855BMNR2G 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, medical, and IoT applications - delivering high-reliability components meeting AEC-Q100 and ISO/TS 16949 standards.

The NCV8855BMNR2G belongs to onsemi's automotive power management IC portfolio, designed specifically to consolidate power delivery in infotainment and digital cockpit systems while meeting stringent EMC, thermal, and functional safety requirements.

FAQ

What is the maximum output current supported by the integrated high-side switch in the NCV8855BMNR2G?

The NCV8855BMNR2G integrated high-side switch supports a peak current limit of 2.00–3.64 A (typical 2.80 A) with latched shutdown on sustained overload. Its R_DS(on) is 233–442 mΩ at V_GS = 8 V, resulting in ≤442 mV dropout at 1 A load - suitable for driving CD/tape mechanisms, electric antennas, or TFT display backlights in automotive environments.

Does the NCV8855BMNR2G require external MOSFETs for all its power outputs?

No. The NCV8855BMNR2G integrates a 300 mΩ NMOS switch for SMPS2 (2.5 A regulator), eliminating external FETs for that rail. However, SMPS1 is a controller only and requires external high-side/low-side NMOS FETs. Both LDO controllers drive external P-channel MOSFET pass devices, and the high-side switch uses its internal NMOS - so only SMPS1 mandates external power FETs.

How does thermal management work in the NCV8855BMNR2G, and what role does the HOT_FLG pin play?

The NCV8855BMNR2G features dual thermal monitors: TMON_HSS (for high-side switch junction) and TMON_SW (for SMPS2 internal MOSFET). Each has independent warning (TWARN1/TWARN2 = 140–160 °C) and shutdown (TSD1/TSD2 = 160–180 °C) thresholds. The open-drain HOT_FLG pin pulls low when either monitor exceeds its warning threshold - enabling immediate system-level action (e.g., reduce display brightness) before thermal shutdown occurs.

Can the NCV8855BMNR2G be synchronized to an external clock, and what is the valid frequency range?

Yes. The NCV8855BMNR2G SYNC pin accepts an external clock signal to synchronize its internal 170 kHz oscillator. Valid synchronization range is 190–255 kHz, with 50 ns minimum HIGH/LOW pulse width. Synchronization delay is 200–400 ns to SMPS1 (on falling edge) and SMPS2 (on rising edge), allowing precise phase alignment in multi-PMIC systems to minimize conducted EMI.

What are the key differences between the SMPS1 and SMPS2 sections of the NCV8855BMNR2G?

SMPS1 is a controller-only buck stage requiring external high-side/low-side NMOS FETs and supporting adjustable current limit via OCSET resistor. SMPS2 is a fully integrated 2.5 A buck regulator with internal 300 mΩ NMOS switch, fixed current limit (2.5–4.2 A), and no OCSET pin. Both use voltage-mode control and share the same 170 kHz base frequency, but SMPS2 simplifies design for medium-power rails where external FETs are undesirable.