NXP Semiconductors MC34700EPR2

Overview

MC34700EPR2 from NXP (formerly Freescale) is a quad-output power management IC integrating three buck regulators and one LDO, designed for space-constrained systems requiring four independent rails. It delivers 1.5A at 2.0–5.25V (CH1), 1.25A at 0.7–3.6V (CH2/CH3), and 400mA at 0.7–3.6V (CH4), with internal MOSFETs, 800 kHz fixed-frequency PWM, ±1.5% output accuracy, and separate enable inputs per channel - used in set-top boxes, laser printers, and telecom line cards.

For engineers reviewing the MC34700EPR2 datasheet, MC34700EPR2 pinout, MC34700EPR2 application, or MC34700EPR2 equivalent, key selection considerations include input voltage range partitioning (9–18V for CH1; 1.5–6V for CH2–CH4), voltage-mode control with external compensation on all buck channels, power-good signaling, and thermal/overcurrent/overvoltage protection architecture.

Technical Context

The MC34700EPR2 implements three voltage-mode controlled buck regulators (two synchronous, one non-synchronous) and one adjustable LDO, each with independent enable logic and cycle-by-cycle current limiting. Channel 1 supports voltage feedforward and accepts 9.0–18V input; channels 2–3 accept 1.5–6.0V derived from CH1 output or external bias; CH4 accepts input from any prior channel output or external source.

It features an open-drain PGOOD signal asserted when all outputs are within ±5% regulation, internal soft-start (typ. 4 ms), and overtemperature shutdown at +150°C. All regulators share a fixed 800 kHz switching frequency, eliminating external timing component selection while enabling consistent EMI profile and inductor sizing across designs.

Key Specifications

Pinout & Package

MC34700EPR2 is housed in a 32-pin QFN package (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Freescale MC34700FS Rev 1 and MC34700 datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-output power management applications.

Compared with MPQ4436-AEC1 and TPS65270PWP, the MC34700EPR2 uniquely supports 1.5V minimum input on CH2–CH4 and includes voltage feedforward on CH1 - critical for stable operation in legacy 12V systems with wide input ripple and tight sequencing constraints.

Availability

MC34700EPR2 is available at Aetrix Electronics and suitable for set-top boxes, laser printers, and telecom line cards requiring stable component supply, long-lifecycle support, and verified thermal performance across -40°C to +85°C.

Supply support for MC34700EPR2 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications.

The MC34700EPR2 belongs to NXP's legacy analog power management portfolio, originally developed by Freescale to address compact, multi-rail power needs in consumer and telecom infrastructure equipment.

FAQ

What input voltage ranges does the MC34700EPR2 support per channel?

The MC34700EPR2 supports 9.0V–18V on VIN1 (Channel 1), and 1.5V–6.0V on VIN2, VIN3, and LDO_VIN (Channels 2–4). Channels 2 and 3 may be powered from Channel 1's output or an external bias rail; Channel 4 may be powered from any of Channels 1–3 or an external source. This partitioning enables efficient cascaded regulation in multi-stage power architectures.

Does the MC34700EPR2 require external MOSFETs?

No, the MC34700EPR2 integrates all power MOSFETs for its three buck regulators and LDO. There are no external high-side or low-side FETs required - only external inductors, output capacitors, feedback resistors, and bootstrap capacitors. This integration reduces total solution size and eliminates gate-drive design complexity for the MC34700EPR2.

What is the purpose of the voltage feedforward feature on Channel 1 of the MC34700EPR2?

Voltage feedforward on Channel 1 of the MC34700EPR2 improves dynamic line regulation by directly scaling the PWM ramp with input voltage. This compensates for input variations (e.g., 9–18V automotive transients) without requiring complex loop compensation, resulting in faster response to VIN steps and reduced output deviation - a key advantage for the MC34700EPR2 in unstable input environments.

How does the MC34700EPR2 handle power sequencing across its four outputs?

The MC34700EPR2 provides independent active-high enable inputs (EN1, EN2, EN3, EN_LDO) for each regulator, allowing full control over startup and shutdown order. No internal sequencing logic is present - timing is determined externally via GPIO, supervisor IC, or RC delays. This flexibility makes the MC34700EPR2 adaptable to diverse system-level sequencing requirements without firmware dependency.

Is the MC34700EPR2 RoHS-compliant and lead-free?

Yes, the MC34700EPR2 is RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU and JEDEC J-STD-609 Category 3 marking requirements. The "R2" suffix denotes tape-and-reel packaging with Pb-free (lead-free) terminal finish and halogen-free molding compound - confirmed in NXP's official product change notices and material declarations for the MC34700EPR2.