NXP Semiconductors MC34VR500V8ES

Overview

MC34VR500V8ES from NXP Semiconductors is a multi-output DC/DC power management IC designed specifically for the LS1046A communications processor. It integrates four buck regulators (SW1: 4.5 A, SW2: 2.0 A, SW3: 2.5 A, SW4: 1.0 A), five LDOs, DDR reference generation (REFOUT), and I²C programmability - delivering complete system power for processor cores, DDR memory, and peripherals in compact networking equipment.

For engineers reviewing the MC34VR500V8ES datasheet, MC34VR500V8ES pinout, MC34VR500V8ES application, or MC34VR500V8ES equivalent, this page provides verified regulator output ranges (e.g., SW1: 0.625–1.875 V), confirmed VTT-disabled operation per Table 1, thermal protection thresholds (130 °C shutdown), I²C interface timing, and exact QFN-EP 56-pin package mapping - all validated against NXP's Rev. 12 (March 2021) technical data.

Technical Context

The MC34VR500V8ES implements a SMARTMOS-based PMIC architecture with independent control of each buck stage via I²C registers, supporting PWM/PPM/APS modes and dynamic voltage scaling. Its power control logic includes dedicated processor interface signals (EN, STBY, PORB, INTB) and event-driven sequencing aligned to LS1046A boot requirements.

SW4 operates in standard buck mode (0.625–1.975 V, 1.0 A), not VTT tracking - a key differentiator from V1/V3/V4 variants - as confirmed by Table 1 (SW4 VTT mode = Disabled) and Section 5.1. REFOUT supplies 10 mA DDR reference voltage, while internal 16 MHz ±8% RC oscillator enables precise timing during startup and regulation.

Key Specifications

Pinout & Package

MC34VR500V8ES uses a 56-pin QFN-EP (8 mm × 8 mm, 0.5 mm pitch) with exposed thermal pad (EP). Pin functions are validated per Table 2 (Rev. 12), including dedicated signal grounds (SGND1–SGND4), separate LX/FB nodes per buck stage, and I²C bus isolation (SCL/SDA/VCCI2C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail PMIC applications.

Compared with MPQ4436-AEC1 and TPS65270, the MC34VR500V8ES uniquely integrates all LS1046A power rails-including VTT-disabled SW4 for flexible auxiliary use-within a single I²C-programmable package, reducing total solution size by >40% and eliminating external sequencing logic.

Availability

MC34VR500V8ES is available at Aetrix Electronics and suitable for network attached storage, mobile wireless routers, and IoT gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC34VR500V8ES 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

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and communication markets.

The MC34VR500 series was developed explicitly to address power delivery complexity in QorIQ LS1/T1 family communications processors, integrating processor-aware sequencing, DDR memory support, and robust thermal management in a single PMIC.

FAQ

What is the SW4 configuration for MC34VR500V8ES?

The MC34VR500V8ES configures SW4 as a standard buck regulator (0.625–1.975 V, 1.0 A), not a VTT tracking regulator. This is confirmed in Table 1 of the datasheet, where "SW4 VTT mode" is explicitly listed as "Disabled" for MC34VR500V8ES - distinguishing it from V1/V3/V4 variants. The output serves auxiliary system rails like HDMI or Ethernet PHY, independent of DDR termination requirements.

Which processor does MC34VR500V8ES support?

MC34VR500V8ES is factory-configured for the LS1046A communications processor, as stated in Table 1 ("Processor" column). Its default start-up sequence (Table 8), voltage settings (e.g., SW1_VOLT = 0.85 V), and pinout alignment match LS1046A power requirements - including support for LS1046ARDB-PA reference design. It is not validated for LS1028 or LX2160 without firmware reconfiguration.

Does MC34VR500V8ES include DDR4 memory support?

Yes, MC34VR500V8ES supports DDR4 memory through its dedicated REFOUT regulator (10 mA output) and LDO1 (250 mA, 0.8–1.55 V) for VDDQ. Although SW4 is disabled for VTT tracking per Table 1, the device retains full DDR4 reference generation capability - REFOUT provides the precise 0.6 V reference needed for DDR4 command/address buses, independent of SW4 operation.

What thermal protection features does MC34VR500V8ES provide?

MC34VR500V8ES includes four programmable thermal warning interrupts (THERM110I to THERM130I) and a hard thermal shutdown at 130 °C (±10 °C tolerance). Per Table 5, the shutdown threshold has 10 °C hysteresis to prevent oscillation. These protections are implemented via an on-die temperature sensor and require no external components - critical for fanless LS1046A systems where junction temperature must stay below 125 °C under continuous load.

How is the start-up sequence configured for MC34VR500V8ES?

The MC34VR500V8ES uses factory-programmed start-up registers defined in Table 8: SW1 and SW2 sequence first (SEQ = 1), followed by SW3 (SEQ = 1), then LDO2–LDO5 and REFOUT (SEQ = 4–5), with LDO1 last (SEQ = -). This order ensures LS1046A core power is established before DDR and peripherals. Sequence timing (tD3 = 1.0 ms between rails) is fixed in hardware and cannot be altered without I²C reprogramming post-power-on.