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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear + Switching

NXP Semiconductors MC34700EP

Name: MC34700EP
Brand: NXP Semiconductors
SKU: MC34700EP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC34700EP

Manufacturer:: NXP Semiconductors

Category:: Voltage Regulators - Linear + Switching

Package:: 32-VFQFN Exposed Pad

Datasheet:: MC34700EP.pdf

Description:: IC REG QUAD BUCK/LNR SYNC 32QFN

Quantity:: RFQ Add To RFQ list

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Inventory:3,598

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Product details

Overview

MC34700EP from NXP (formerly Freescale) is a quad-output power management IC integrating three buck regulators and one LDO, delivering 1.5A/1.25A/1.25A/0.4A across four rails. It operates with VIN1 = 9.0–18V and VIN2/VIN3/LDO_VIN = 1.5–6.0V, features ±1.5% output voltage accuracy, fixed 800 kHz switching frequency, and internal MOSFETs - used in set-top boxes, cable modems, and laser printers.

For engineers reviewing the MC34700EP datasheet, MC34700EP pinout, MC34700EP application, or MC34700EP equivalent, key selection considerations include input voltage domain partitioning (channel 1 vs. channels 2–4), independent enable control per rail, voltage-mode control with external compensation, power-good signaling, and thermal/overcurrent/overvoltage protection architecture.

Technical Context

The MC34700EP implements voltage-mode PWM control on all three buck channels, with channel 1 featuring voltage feedforward for improved line transient response. Each buck regulator uses external compensation networks (COMPx/FBx pins) to tailor loop stability and dynamic performance for specific load and layout conditions.

Channel 1 supplies bias to channels 2 and 3; channels 2–4 support flexible input sourcing (from upstream outputs or external rails). The LDO (channel 4) accepts input from any of the first three outputs or an external source, enabling cascaded or independent power tree configurations without external regulators.

Key Specifications

Parameter	Value and Actual Design Meaning
VIN1 Range	9.0 V to 18 V - defines primary high-voltage input domain for channel 1 and bias source for downstream rails
VIN2/VIN3/LDO_VIN Range	1.5 V to 6.0 V - supports cascaded operation from VOUT1 or external low-voltage sources
Output Currents	VOUT1: 1.5 A; VOUT2/VOUT3: 1.25 A each; LDO (VOUT4): 400 mA - sets maximum sustained load capability per rail
Output Voltage Accuracy	±1.5% - ensures tight regulation across temperature and line/load variations for sensitive logic/memory rails
Switching Frequency	Fixed 800 kHz - enables predictable EMI profile and consistent inductor sizing without frequency programming
Protection Features	Overvoltage, undervoltage, overcurrent (cycle-by-cycle), short-circuit, overtemperature - provides autonomous fault containment without host intervention
Power-Good Output	Open-drain PGOOD signal - enables system-level power sequencing validation and reset assertion

Pinout & Package

MC34700EP is housed in a 32-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Freescale MC34700FS Rev 1 and MC34700 datasheet.

Pin/Terminal	Circuit Role	Design Meaning
VIN1	Main high-voltage input supply	Accepts 9–18 V input for channel 1; powers internal circuitry and supplies bias to channels 2/3
VIN2, VIN3, LDO_VIN	Secondary input supplies	Each accepts 1.5–6.0 V from upstream outputs or external sources - enables flexible power tree topology
VOUT1–VOUT4	Regulated output terminals	Deliver 2.0–5.25 V / 0.7–3.6 V / 0.7–3.6 V / 0.7–3.6 V at rated currents; require external output capacitors
EN1–EN3, EN_LDO	Active-high enable inputs	Independent digital control of each regulator's startup/shutdown - supports custom power-up sequencing
PGOOD	Open-drain status output	Asserts low when all outputs are within ±10% regulation window - used for system reset or sequencing coordination
BST1–BST3	Bootstrap supply connections	Provide gate drive voltage for high-side MOSFETs in synchronous buck channels 1–3
COMP1–COMP3, FB1–FB3, LDO_FB	Compensation and feedback nodes	Enable external Type II/III compensation network design for loop stability and transient response tuning

Key Features

Feature	Design Value
Three integrated buck regulators + one LDO	Reduces board area and BOM count by consolidating four independent power rails into single QFN package
Voltage feedforward on channel 1	Improves line transient response time without increasing compensation complexity or requiring additional components
Separate enable per channel	Enables precise, software- or hardware-controlled power sequencing - critical for multi-rail SoC/microprocessor systems
Internal power MOSFETs	Eliminates need for external high-side/low-side switches, reducing design iteration time and layout sensitivity
Fixed 800 kHz switching frequency	Ensures repeatable EMI behavior and simplifies filter design versus variable-frequency alternatives

Applications

Set-Top Box Power Tree	Cable Modem Core Supply
Use Scenario: Powering SoC, DDR memory, tuner, and front-panel display in compact consumer STB enclosures. IC Role / Device Role / Timing Role: MC34700EP delivers four regulated rails - VOUT1 (3.3 V/1.5 A) for SoC I/O, VOUT2 (1.2 V/1.25 A) for core, VOUT3 (1.5 V/1.25 A) for DDR, VOUT4 (3.3 V/0.4 A) for display backlight. Use Value: Single-chip solution eliminates discrete DC/DC + LDO combinations, reducing footprint by >40% and easing thermal management in sealed enclosures.	Use Scenario: Providing isolated, sequenced power to Ethernet PHY, DOCSIS processor, flash memory, and RF front-end in cable modem designs. IC Role / Device Role / Timing Role: MC34700EP generates VOUT1 (12 V → 3.3 V/1.5 A) as main system rail, VOUT2 (3.3 V → 1.2 V/1.25 A) for CPU core, VOUT3 (3.3 V → 2.5 V/1.25 A) for memory, VOUT4 (3.3 V → 3.3 V LDO/0.4 A) for analog PHY bias. Use Value: Independent ENx pins allow strict boot-order compliance with DOCSIS specification; PGOOD confirms stable rail delivery before firmware execution.
Laser Printer Engine Control	Point-of-Sale Terminal
Use Scenario: Supplying motor drivers, sensor interfaces, thermal print head, and MCU in space-constrained printer engine boards. IC Role / Device Role / Timing Role: MC34700EP supplies VOUT1 (12 V → 5 V/1.5 A) for stepper drivers, VOUT2 (5 V → 3.3 V/1.25 A) for MCU, VOUT3 (5 V → 2.5 V/1.25 A) for sensors, VOUT4 (5 V → 3.3 V LDO/0.4 A) for thermal head reference. Use Value: Cascaded input capability (VIN2/VIN3/LDO_VIN sourced from VOUT1) minimizes external bias supplies; overtemperature protection prevents thermal runaway during high-duty-cycle print jobs.	Use Scenario: Powering ARM-based payment processor, LCD controller, EMV smart-card reader, and USB interface in compact countertop POS terminals. IC Role / Device Role / Timing Role: MC34700EP delivers VOUT1 (12 V → 3.3 V/1.5 A) for main processor, VOUT2 (3.3 V → 1.8 V/1.25 A) for DDR, VOUT3 (3.3 V → 3.3 V/1.25 A) for peripherals, VOUT4 (3.3 V → 3.3 V LDO/0.4 A) for secure element. Use Value: ±1.5% output accuracy ensures reliable operation of cryptographic modules and touch-screen controllers; PGOOD enables deterministic boot under varying AC adapter conditions.

Set-Top Box Power Tree

Cable Modem Core Supply

Use Scenario: Powering SoC, DDR memory, tuner, and front-panel display in compact consumer STB enclosures.

IC Role / Device Role / Timing Role: MC34700EP delivers four regulated rails - VOUT1 (3.3 V/1.5 A) for SoC I/O, VOUT2 (1.2 V/1.25 A) for core, VOUT3 (1.5 V/1.25 A) for DDR, VOUT4 (3.3 V/0.4 A) for display backlight.

Use Value: Single-chip solution eliminates discrete DC/DC + LDO combinations, reducing footprint by >40% and easing thermal management in sealed enclosures.

Use Scenario: Providing isolated, sequenced power to Ethernet PHY, DOCSIS processor, flash memory, and RF front-end in cable modem designs.

IC Role / Device Role / Timing Role: MC34700EP generates VOUT1 (12 V → 3.3 V/1.5 A) as main system rail, VOUT2 (3.3 V → 1.2 V/1.25 A) for CPU core, VOUT3 (3.3 V → 2.5 V/1.25 A) for memory, VOUT4 (3.3 V → 3.3 V LDO/0.4 A) for analog PHY bias.

Use Value: Independent ENx pins allow strict boot-order compliance with DOCSIS specification; PGOOD confirms stable rail delivery before firmware execution.

Laser Printer Engine Control

Point-of-Sale Terminal

Use Scenario: Supplying motor drivers, sensor interfaces, thermal print head, and MCU in space-constrained printer engine boards.

IC Role / Device Role / Timing Role: MC34700EP supplies VOUT1 (12 V → 5 V/1.5 A) for stepper drivers, VOUT2 (5 V → 3.3 V/1.25 A) for MCU, VOUT3 (5 V → 2.5 V/1.25 A) for sensors, VOUT4 (5 V → 3.3 V LDO/0.4 A) for thermal head reference.

Use Value: Cascaded input capability (VIN2/VIN3/LDO_VIN sourced from VOUT1) minimizes external bias supplies; overtemperature protection prevents thermal runaway during high-duty-cycle print jobs.

Use Scenario: Powering ARM-based payment processor, LCD controller, EMV smart-card reader, and USB interface in compact countertop POS terminals.

IC Role / Device Role / Timing Role: MC34700EP delivers VOUT1 (12 V → 3.3 V/1.5 A) for main processor, VOUT2 (3.3 V → 1.8 V/1.25 A) for DDR, VOUT3 (3.3 V → 3.3 V/1.25 A) for peripherals, VOUT4 (3.3 V → 3.3 V LDO/0.4 A) for secure element.

Use Value: ±1.5% output accuracy ensures reliable operation of cryptographic modules and touch-screen controllers; PGOOD enables deterministic boot under varying AC adapter conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ4436-AEC1	Automotive-grade (AEC-Q100), dual buck + dual LDO; no voltage feedforward; 2.5 MHz switching	Designed for automotive infotainment; lacks cascaded input flexibility and independent EN per rail	Choose only if AEC-Q100 qualification and higher frequency are required; not drop-in due to different pinout and control scheme
TPS65270	Two bucks + one LDO; 2.5 V–18 V input; no independent EN per channel; no PGOOD	Targeted at DSP/ARM power; requires external sequencing logic and monitoring circuitry	Select when cost-sensitive dual-rail designs dominate; not suitable for four-rail sequencing-critical applications like STBs or modems

Compared with MPQ4436-AEC1 and TPS65270, the MC34700EP uniquely supports four independently enabled rails with cascaded input sourcing and voltage feedforward - making it optimal for consumer and industrial multi-rail systems where sequencing, footprint, and bias efficiency are prioritized over automotive qualification or ultra-high switching frequency.

Availability

MC34700EP is available at Aetrix Electronics and suitable for set-top boxes, cable modems, and laser printers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MC34700EP 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, with deep heritage in analog and power management from its Freescale acquisition.

The MC34700EP belongs to NXP's legacy analog power management portfolio, designed specifically for space-constrained consumer and industrial systems needing integrated, sequenced, and protected multi-rail power delivery without external MOSFETs or complex compensation.

FAQ

What input voltage ranges does the MC34700EP support for each channel?

The MC34700EP supports 9.0 V to 18 V on VIN1 (channel 1), and 1.5 V to 6.0 V on VIN2, VIN3, and LDO_VIN (channels 2–4). Channels 2 and 3 may be powered from VOUT1; channel 4 may be powered from any of VOUT1–VOUT3 or an external source. This architecture enables efficient cascaded power trees in multi-rail systems using the MC34700EP.

Does the MC34700EP require external MOSFETs?

No, the MC34700EP integrates all power MOSFETs internally - including high-side and low-side switches for the three buck regulators and pass transistor for the LDO. This eliminates external switch selection, layout optimization, and gate-drive design effort, making the MC34700EP a fully self-contained power solution.

How is power sequencing controlled on the MC34700EP?

Power sequencing on the MC34700EP is controlled via four independent active-high enable inputs: EN1, EN2, EN3, and EN_LDO. Each corresponds to one output rail and allows precise timing control through external GPIOs or RC delays. This enables custom startup/shutdown order without additional logic, a key capability confirmed in the MC34700EP datasheet and application notes.

What protection features are built into the MC34700EP?

The MC34700EP includes overvoltage, undervoltage, cycle-by-cycle overcurrent, short-circuit, and overtemperature protection across all channels. It also provides an open-drain PGOOD output that asserts only when all four outputs are within ±10% regulation. These protections operate autonomously - no host intervention required - ensuring robust operation in the MC34700EP's target applications.

Is the MC34700EP pin-compatible with newer NXP power management ICs?

No, the MC34700EP is not pin-compatible with newer NXP PMICs such as the PCA9450 or PF5020 families. Its 32-pin QFN layout, terminal assignment (e.g., BSTx, COMPx, ENx), and functional partitioning are unique to the MC34700EP design. Migration requires PCB redesign and firmware adaptation; replacement should be evaluated per application requirements, not assumed as drop-in.

MC34700EP Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tray

Product Status:: Obsolete

Topology:: Step-Down (Buck) Synchronous (3), Linear (LDO) (1)

Number of Outputs:: 4

Frequency - Switching:: 800kHz

Voltage/Current - Output 1:: 2V ~ 5.25V, 1.5A

Voltage/Current - Output 2:: 0.7V ~ 3.6V, 1.25A

Voltage/Current - Output 3:: 0.7V ~ 3.6V, 1.25A

w/LED Driver:: No

w/Supervisor:: No

w/Sequencer:: No

Voltage - Supply:: 9V ~ 18V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-QFN-EP (5x5)

MC34700EP FAQ

1.How can I place an order for MC34700EP through Aetrix?

Please submit a Request for Quotation (RFQ) for MC34700EP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MC34700EP reliable?

The price and inventory of MC34700EP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34700EP is usually 5 days.

3.What payment methods are accepted for MC34700EP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34700EP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC34700EP?

MC34700EP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC34700EP order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MC34700EP?

For technical support, including MC34700EP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34700EP requirements.

6.How does Aetrix verify that MC34700EP is sourced from the original manufacturer or authorized distributors?

All MC34700EP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC34700EP meets industry standards.

7.What is the process for return or replacement of MC34700EP?

All MC34700EP units undergo pre-shipment inspection (PSI). If there is an issue with MC34700EP, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MC34700EP part is unused and in its original packaging.

Return procedure for MC34700EP:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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