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NXP Semiconductors MC34704BEP
- Part No.:
- MC34704BEP
- Manufacturer:
- NXP Semiconductors
- Category:
- Power Management - Specialized
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
MC34704BEP.pdf
- Description:
- IC POWER MANAGEMENT 56-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,444
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Product details
Overview
MC34704BEP from NXP Semiconductors (formerly Freescale) is a 5-channel DC-DC power management IC (PMIC) designed for multimedia application processors. It delivers regulated outputs of 0.6–3.6 V, 5.0–15 V, and −5.0 to −9.0 V from a single 2.7–5.5 V input, supports I²C programmability, dynamic voltage scaling, and operates up to 2.0 MHz switching frequency. It targets Li-ion/polymer battery-powered portable devices and USB-powered systems.
For engineers reviewing the MC34704BEP datasheet, MC34704BEP pinout, MC34704BEP application, or MC34704BEP equivalent, key selection criteria include regulator count (5 vs. 8), REG2–REG5/REG8 output voltage ranges, ±2% output accuracy, thermal/overcurrent protection per channel, and QFN56 package compatibility with space-constrained PCB layouts.
Technical Context
The MC34704BEP implements five independent switching regulators-REG2 (buck-boost), REG3 (buck), REG4 (buck-boost), REG5 (buck-boost), and REG8 (boost)-with dedicated feedback (FBx), bootstrap (BTx), switch node (SWx), and compensation (COMPx) pins. Each regulator features per-channel overcurrent, undervoltage/overvoltage detection, and thermal monitoring (except REG7, excluded in B variant).
Its I²C interface (SCL/SDA) enables full configuration of output voltages, soft-start timing (SS), oscillator frequency (FREQ), and sequencing. The device uses SMARTMOS technology and integrates compensation for REG2, REG3, REG4, REG5, and REG8, eliminating external compensation components for those channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Count | 5 independent DC-DC regulators: REG2, REG3, REG4, REG5, REG8 - no REG1, REG6, REG7 (B-variant exclusion) |
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-ion/polymer batteries and USB 5 V supply |
| Output Voltage Ranges | REG2/REG5: 0.6–3.6 V; REG3: 0.6–1.8 V; REG4: 0.6–3.6 V; REG8: 5.0–15 V - covers core, I/O, DDR, LCD, and LED bias rails |
| Output Accuracy | ±2% - ensures stable voltage delivery under load and temperature variation for processor subsystems |
| Switching Frequency | 750 kHz to 2.0 MHz - enables use of small external inductors and capacitors for compact power solutions |
| I²C Interface | Standard-mode (up to 400 kHz) - allows real-time voltage adjustment, fault reporting, and sequencing control via host MCU |
| Shutdown Current | ≤5.0 µA at 5.5 V VIN - minimizes battery drain in system sleep states |
Pinout & Package
The MC34704BEP is housed in a Pb-free 56-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad (PGND). Pin assignments are identical to MC34704AEP except for NC pins at positions 23 (VOUT1 → NC0), 28 (COMP7 → NC1), 29 (VREF7 → NC2), 30 (FB7 → AGND1), 31 (DRV7 → NC3), 32 (VOUT7 → PGND1), 34 (BT6 → NC4), and 36 (VOUT6 → PGND3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Battery input supply | Main power rail for all regulators; requires 10 µF decoupling capacitor |
| VOUT2–VOUT5, VOUT8 | Regulated output voltage pins | Direct connection to load; must be routed with low-inductance paths and local ceramic filtering |
| FB2–FB5, FB8 | Voltage feedback inputs | Connect resistor dividers to set output voltage; reference = 0.600 V (except REG8 current mode = 0.230 V) |
| SW2D/SW2U, SW3, SW4D/SW4U, SW5D/SW5U, SW8 | Switching nodes | High-frequency AC nodes connecting to external inductors; require tight layout and Kelvin routing |
| BT2D/BT2U, BT3, BT4D/BT4U, BT5D/BT5U, BT8 | Bootstrap capacitor inputs | Drive high-side FET gates; require 0.01 µF (BT3/BT4U/BT8) or 1.0 µF (BT2D/BT2U/BT5U/BT5D) ceramic caps to SWx |
| SCL / SDA | I²C serial interface | Enable register-based configuration, fault readback, and dynamic voltage scaling without hardware changes |
| RST | Open-drain reset output | Signals microprocessor reset; requires external pull-up to VIN or another supply rail |
| ONOFF | Hardware enable/disable | Active-high signal to globally power up/down all regulators - supports mechanical power switch integration |
Key Features
| Feature | Design Value |
|---|---|
| Per-regulator protection | Independent overcurrent, short-circuit, undervoltage, overvoltage, and thermal detection - eliminates need for discrete supervision ICs |
| I²C programmability | Full register access for output voltage, soft-start time, switching frequency, and fault response - enables firmware-driven power policy adaptation |
| Dynamic voltage scaling (DVS) | ±10–17.5% DVS range with 1.0–2.5% step size on all 5 regulators - supports processor DVFS for power/performance optimization |
| Integrated compensation | On-chip compensation networks for REG2, REG3, REG4, REG5, and REG8 - reduces BOM count and layout area |
| True cutoff capability | Complete isolation of boost and buck-boost outputs during shutdown - prevents reverse current and leakage into powered-down rails |
Applications
| Smartphone Application Processor Power | Tablet DDR Memory Supply |
|---|---|
Use Scenario: Powers ARM-based application processor cores (e.g., i.MX series) requiring multiple independent voltage rails with dynamic scaling. IC Role / Device Role / Timing Role: PMIC providing VCORE (REG3), VIO (REG2/REG4), and VDDQ (REG5) with synchronized startup and I²C-controlled DVFS. Use Value: Enables precise core voltage control during CPU frequency transitions, reducing active power by up to 30% versus fixed-output solutions. | Use Scenario: Supplies DDR2/DDR3 memory interface with tightly regulated 1.2–1.8 V VDDQ and 2.5 V VTT rails. IC Role / Device Role / Timing Role: Dual-output regulator (REG4 + REG8) delivering matched, low-noise VDDQ and VTT with <±2% accuracy and fast transient response. Use Value: Maintains signal integrity across high-speed memory buses by minimizing voltage droop during burst accesses. |
| USB-Powered Portable Media Player | LCD Backlight Driver (LED Boost) |
Use Scenario: Powers audio codec, display controller, and NAND flash from 5 V USB input in battery-free portable media players. IC Role / Device Role / Timing Role: Single-input, multi-rail PMIC converting 5 V USB to 3.3 V (REG2), 1.2 V (REG3), 1.8 V (REG4), and 5 V (REG5) with sequenced enable. Use Value: Eliminates need for discrete LDOs and buck converters, reducing solution size by >40% and improving efficiency to >88% at 500 mA load. | Use Scenario: Drives white LED strings in handheld displays requiring constant-current regulation and high-voltage boost. IC Role / Device Role / Timing Role: REG8 configured in current-regulation mode (0.230 V FB reference) delivering up to 30 mA at 5–15 V with thermal foldback. Use Value: Provides flicker-free backlight dimming via I²C while protecting LEDs from overcurrent and thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC34704AEP/R2 | 8-regulator variant including REG1, REG6, REG7; supports negative voltage generation (−5 to −9 V) and higher-voltage boost (15 V) | Required for designs needing VCORE+VIO+DDR+LCD+audio+peripheral rails simultaneously; not pin-compatible due to functional pin reassignments | Select MC34704AEP/R2 only when all 8 rails are required and board layout accommodates identical QFN56 footprint with updated pin mapping |
| TPS65910A3RSLR | Texas Instruments 10-channel PMIC with integrated RTC, LDOs, and battery charger; different I²C address ($58), no negative output, lower max switching frequency (3 MHz) | Targets OMAP/AM335x platforms with system-level power sequencing needs; lacks REG7-style negative bias but adds fuel-gauge and charging | Choose TPS65910A3RSLR for new designs requiring battery management and real-time clock; not drop-in due to different register map and pinout |
Compared with MC34704AEP/R2 and TPS65910A3RSLR, the MC34704BEP offers optimal balance of regulator count, negative/positive dual-rail capability, and compact footprint for mid-tier multimedia processors - ideal where REG1/REG6/REG7 are unused and cost-sensitive BOM reduction is critical.
Availability
MC34704BEP is available at Aetrix Electronics and suitable for smartphone application processor power, tablet DDR memory supply, USB-powered portable media players, and LCD backlight driver applications requiring stable component supply and long-term industrial availability.
Supply support for MC34704BEP 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 acquired Freescale in 2015 and maintains legacy PMIC product lines including the MC34704 family. NXP focuses on secure, energy-efficient semiconductor solutions for automotive, industrial, and IoT markets.
The MC34704 product line was designed specifically for power management of multimedia application processors in portable consumer electronics, emphasizing high integration, I²C configurability, and multi-topology DC-DC conversion in minimal PCB area.
FAQ
What is the regulator configuration of the MC34704BEP?
The MC34704BEP integrates five independent switching regulators: REG2 (buck-boost), REG3 (buck), REG4 (buck-boost), REG5 (buck-boost), and REG8 (boost). It excludes REG1, REG6, and REG7 - distinguishing it from the 8-regulator MC34704AEP/R2 variant. All five regulators support I²C programming, dynamic voltage scaling, and per-channel fault protection.
Does the MC34704BEP support negative voltage output?
No, the MC34704BEP does not support negative voltage output. Negative regulation (−5.0 V to −9.0 V) is provided only by REG7, which is exclusive to the MC34704AEP/R2 variant. The MC34704BEP's five regulators deliver positive outputs ranging from 0.6 V to 15 V.
What is the maximum switching frequency of the MC34704BEP?
The MC34704BEP supports a selectable switching frequency up to 2.0 MHz on REG2 and REG5, and up to 1.5 MHz on REG3 and REG4. REG8 operates up to 2.0 MHz. Frequency is set via the FREQ pin using an external resistor divider between VDDI and AGND, enabling optimization of efficiency versus external component size.
How does the MC34704BEP handle overcurrent protection?
The MC34704BEP provides per-regulator overcurrent protection with ±20% accuracy. For REG2, REG3, REG4, and REG5, overcurrent is detected in the high-side or low-side FET depending on topology; for REG8, it is detected in the low-side FET. Each channel includes a 10 ms timeout timer and automatic retry after fault clearance, ensuring robust operation under transient overload conditions.
Is the MC34704BEP pin-compatible with the MC34704AEP/R2?
No, the MC34704BEP is not pin-compatible with the MC34704AEP/R2 despite sharing the same QFN56 package. Pins 23, 28, 29, 30, 31, 32, 34, and 36 are reassigned as no-connect or alternate ground connections in the B-variant, altering the functional pin map. Board redesign is required when migrating between variants.
MC34704BEP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 56-VFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Applications:
- Processor
- Current - Supply:
- 86mA
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-QFN-EP (7x7)
MC34704BEP FAQ
1.How can I place an order for MC34704BEP through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34704BEP 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 MC34704BEP reliable?
The price and inventory of MC34704BEP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34704BEP is usually 5 days.
3.What payment methods are accepted for MC34704BEP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34704BEP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34704BEP?
MC34704BEP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34704BEP 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 MC34704BEP?
For technical support, including MC34704BEP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34704BEP requirements.
6.How does Aetrix verify that MC34704BEP is sourced from the original manufacturer or authorized distributors?
All MC34704BEP 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 MC34704BEP meets industry standards.
7.What is the process for return or replacement of MC34704BEP?
All MC34704BEP units undergo pre-shipment inspection (PSI). If there is an issue with MC34704BEP, 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 MC34704BEP part is unused and in its original packaging.
Return procedure for MC34704BEP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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