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NXP Semiconductors MCZ34701EWR2
- Part No.:
- MCZ34701EWR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Special Purpose Regulators
- Package:
- 32-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
MCZ34701EWR2.pdf
- Description:
- 1.5 AMPERE SWITCH-MODE POWER SUP
- Quantity:
- Payment:
- Shipping:
Inventory:2,660
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Product details
Overview
MCZ34701EWR2 from NXP Semiconductors (formerly Freescale) is a dual-output power management IC integrating a 1.5A synchronous buck switcher and an external-NMOS LDO controller for microprocessor core (VDDL) and I/O/bus (VDDH) rail generation. It operates from 2.8V–6.0V input, delivers ±1% output voltage accuracy (0.8V reference), supports I²C voltage margining, and enables precise up/down power sequencing for Power QUICC I/II and MPC8xxx families.
For engineers reviewing the MCZ34701EWR2 datasheet, MCZ34701EWR2 pinout, MCZ34701EWR2 application, or MCZ34701EWR2 equivalent, this device is selected for high-efficiency, sequenced dual-rail CPU power delivery requiring programmable reset delay, thermal protection, and I²C-configurable voltage margins in industrial and networking embedded systems.
Technical Context
The MCZ34701EWR2 implements a fixed-frequency (default 300 kHz, adjustable via FREQ pin resistor) synchronous buck regulator with integrated 60 mΩ/65 mΩ HS/LS MOSFETs and a separate LDO gate driver (LDRV) controlling an external N-channel pass transistor. Its internal boost regulator (VBST = 7.7 V nominal, 20 mA drive) supplies gate drive for both integrated and external MOSFETs.
Power sequencing is determined by EN1/EN2 logic states (four modes including disabled, standard, inverted, and no-sequencing), while reset supervision monitors both VOUT and LFB feedback nodes with 20 µs filtering and programmable power-on delay via RT/CT network. I²C interface (SCL/SDA, 100 kHz max) enables real-time voltage margining and address configuration via ADDR/CLKSEL pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8 V to 6.0 V - Supports wide-input industrial and telecom supply rails without pre-regulation. |
| Buck Output Current | 1.5 A continuous - Sufficient for core supply of Power QUICC II and MPC82xx processors. |
| Buck Feedback Voltage | 0.800 V ±2% - Precision reference enabling stable low-voltage core rails (e.g., 1.2 V, 1.8 V) with tight regulation. |
| LDO Control Architecture | External NMOS gate driver (LDRV) - Enables scalable I/O rail current beyond IC limits using discrete pass FETs like IRL2703. |
| Switching Frequency | 300 kHz default (200–400 kHz adjustable) - Balances efficiency, EMI, and inductor size for compact board layout. |
| I²C Interface | Standard-mode (100 kHz), 7-bit address - Allows dynamic voltage margining (±7.9%), fault logging, and system-level power coordination. |
| Thermal Protection | 170 °C trip (10 °C hysteresis) on VOUT/LDO pull-down MOSFETs and die - Prevents catastrophic failure during overload or poor heatsinking. |
Pinout & Package
MCZ34701EWR2 is housed in a 32-pin SOICW (Wide-body Small Outline Integrated Circuit) package with exposed thermal pad, optimized for thermal dissipation in high-current power applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ | Oscillator frequency selection | Connect external resistor (7–22 kΩ) to set switching frequency from 200–400 kHz; open or tied to VDDI defaults to 300 kHz. |
| INV | Buck error amplifier inverting input | Feedback node for VOUT regulation; connects to resistor divider from VOUT to GND. |
| VOUT | Buck converter output | Main core supply output (e.g., 1.2 V); also input to power sequencing control circuitry. |
| VIN2 | Buck input power rail | High-side MOSFET drain connection; accepts 2.8–6.0 V input, shared with VIN1 for internal logic supply. |
| SW | Buck switching node | Connects to power inductor; carries high di/dt current; requires low-inductance layout to minimize EMI. |
| GND / PGND | Analog / power ground | Separate analog (pins 8,9,24,25) and power (pins 10,11) grounds reduce noise coupling into sensitive feedback paths. |
| VBST | Internal boost regulator output | 7.7 V nominal supply for HS/LS gate drivers and external LDO FET gate drive; requires 10 µF low-ESR capacitor. |
| LDRV | LDO gate driver output | Drives gate of external N-channel MOSFET (e.g., IRL2703); supports >1 A LDO output current. |
| SCL / SDA | I²C bus interface | Standard-mode (100 kHz) bidirectional communication for voltage margining, status readback, and address configuration. |
| RST | Open-drain reset output | Active-low reset signal asserted until both VOUT and VLDO are in regulation and RT timer expires; requires external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Precise dual-rail power sequencing | Four EN1/EN2-selectable modes (including inverted sequencing) ensure safe CPU boot/shutdown per MPC8xxx requirements. |
| I²C voltage margining | ±7.9% adjustment in 1% steps enables system-level validation of voltage tolerance margins without hardware changes. |
| Programmable power-on reset delay | RT/CT network sets delay from 10 ms + RtCt; supports synchronization with FPGA or peripheral initialization timing. |
| Integrated boost regulator | 7.7 V, 20 mA VBST supply eliminates need for external charge pump, enabling efficient gate drive for integrated and external FETs. |
| Comprehensive fault protection | UVLO on VBST, overcurrent on buck/LDO paths, thermal shutdown (170 °C), and reset supervision on both outputs. |
Applications
| Baseband Processor Power | Industrial Control Unit |
|---|---|
|
Use Scenario: Powering MPC8272-based wireless baseband processing units in LTE small cells. IC Role / Device Role / Timing Role: Generates sequenced 1.2 V core (VDDL) and 3.3 V I/O (VDDH) rails with synchronized reset release after FPGA configuration. Use Value: Eliminates discrete sequencing ICs and reduces BOM count by integrating buck, LDO controller, and I²C supervision in one 32-pin SOICW. |
Use Scenario: Supplying dual-rail power to Power QUICC II MPC8343E in DIN-rail mounted PLC controllers. IC Role / Device Role / Timing Role: Delivers regulated 1.5 V core and 2.5 V I/O with programmable reset delay matching EtherCAT slave initialization timing. Use Value: Enables field-upgradable voltage margins via I²C to compensate for aging or temperature drift without firmware update. |
| Network Router Line Card | Medical Imaging Subsystem |
|
Use Scenario: Providing core and I/O power to MPC8548-based routing ASICs in carrier-grade routers. IC Role / Device Role / Timing Role: Implements inverted power sequencing (EN1=1, EN2=0) to de-assert I/O before core during graceful shutdown. Use Value: Prevents latch-up and data corruption during hot-swap events by enforcing strict voltage ordering per IEEE 1149.1 guidelines. |
Use Scenario: Supplying tightly regulated rails to DSP-based ultrasound beamforming modules requiring low-noise operation. IC Role / Device Role / Timing Role: Uses separate GND/PGND planes and low-ESR capacitors (1 µF VDDI, 10 µF VBST, 10 µF LDO) to minimize switching noise on analog signal paths. Use Value: Achieves <40 dB ripple rejection at 300 kHz, preserving SNR in high-resolution ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4470-AEC1 | Single-buck + integrated LDO (not external-FET controllable); AEC-Q100 qualified; 2.5 A buck current. | Automotive infotainment SoC power; lacks I²C margining and programmable sequencing modes. | Select when automotive qualification and higher buck current are required, but external LDO flexibility and I²C configurability are not needed. |
| TPS65023B | Triple-output (2 buck + 1 LDO); no external LDO FET drive; I²C interface; 1.5 A per buck channel. | ARM Cortex-A8 application processors; integrates all rails but cannot scale LDO current beyond 0.5 A. | Select when three regulated outputs are required and LDO current stays ≤500 mA; avoid when MPC8xxx sequencing or >1 A I/O rail is needed. |
Compared with MPQ4470-AEC1 and TPS65023B, MCZ34701EWR2 uniquely combines external LDO FET control, four programmable sequencing modes, and I²C voltage margining-making it irreplaceable for legacy Freescale Power QUICC designs requiring field-adjustable margins and scalable I/O current.
Availability
MCZ34701EWR2 is available at Aetrix Electronics and suitable for industrial control units, network router line cards, medical imaging subsystems, and baseband processor power applications requiring stable component supply across extended temperature ranges (-40°C to +85°C).
Supply support for MCZ34701EWR2 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 markets, formed from the acquisition of Freescale Semiconductor in 2015.
The MCZ34701EWR2 belongs to NXP's legacy Power Management IC portfolio, specifically designed for powering Freescale's Power QUICC and MPC8xxx microprocessor families with integrated sequencing, margining, and robust protection.
FAQ
What is the function of the VBST pin on the MCZ34701EWR2?
The VBST pin on the MCZ34701EWR2 provides the 7.7 V nominal output of the internal boost regulator, delivering up to 20 mA to drive the gates of the integrated high-side/low-side buck MOSFETs and the external N-channel pass transistor controlled by the LDRV pin. It requires a 10 µF low-ESR ceramic capacitor to ground for stability and must be decoupled independently from other supplies to maintain gate drive integrity under transient load conditions. This integrated boost eliminates the need for an external charge pump in MCZ34701EWR2 designs.
How does the MCZ34701EWR2 implement power sequencing between core and I/O rails?
The MCZ34701EWR2 implements power sequencing through logic-controlled EN1 and EN2 inputs, which select among four distinct modes: regulators disabled, standard sequencing (VOUT first, then VLDO), inverted sequencing (VLDO first, then VOUT), or no sequencing (both enabled simultaneously). The sequencing control circuitry monitors feedback voltages (INV and LFB) and uses internal timers to enforce delays, ensuring proper voltage ramp-up order required by MPC8xxx and Power QUICC processors. This behavior is hardwired and does not require firmware or external components.
Can the MCZ34701EWR2 support I²C voltage margining for both buck and LDO outputs?
Yes, the MCZ34701EWR2 supports I²C voltage margining for both outputs: the buck regulator (VOUT) and the LDO-controlled rail (VLDO). Using the SDA and SCL pins, the device allows ±7.9% adjustment in 1.0% increments for each output independently. Margining is applied to the respective feedback references (0.800 V for both), enabling system-level validation of voltage tolerance margins during qualification testing or field calibration without modifying resistor dividers. This capability is confirmed in the Electrical Characteristics tables (VMP/VMN and VMP/VMN parameters) and Functional Description section.
What is the maximum recommended value for the reset timer capacitor (Ct) on the MCZ34701EWR2 RT pin?
The maximum recommended value for the reset timer capacitor (Ct) connected to the RT pin of the MCZ34701EWR2 is 47 µF, as specified in Table 3 of the datasheet. Exceeding this value may degrade timing accuracy and increase susceptibility to leakage-induced errors. The reset delay is calculated as tD = 10 ms + RtCt, where Rt is the external resistor. For reliable operation, Rt should be ≥10 kΩ, and Ct must be a low-leakage type (e.g., ceramic or polymer) to prevent drift in the programmed delay. This timing directly controls RST assertion duration after power-up.
Does the MCZ34701EWR2 integrate power MOSFETs for both the buck regulator and the LDO circuit?
The MCZ34701EWR2 integrates N-channel power MOSFETs only for the synchronous buck regulator (Q1 and Q2, with RDS(ON) of 60 mΩ and 65 mΩ respectively); it does not integrate MOSFETs for the LDO circuit. Instead, it provides the LDRV gate driver output and CS current sense input to control an external N-channel MOSFET (e.g., IRL2703), allowing scalable LDO current beyond the IC's internal limits. This architecture is explicitly documented in the Block Diagram, Pin Descriptions (LDRV, CS, LDO pins), and Electrical Characteristics (LDO current sense threshold, LDRV drive current).
MCZ34701EWR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, Power QUICC™ I, II
- Voltage - Input:
- 2.8V ~ 6V
- Number of Outputs:
- 2
- Voltage - Output:
- 7.75V, 0.8V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-SOIC
MCZ34701EWR2 FAQ
1.How can I place an order for MCZ34701EWR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MCZ34701EWR2 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 MCZ34701EWR2 reliable?
The price and inventory of MCZ34701EWR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCZ34701EWR2 is usually 5 days.
3.What payment methods are accepted for MCZ34701EWR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCZ34701EWR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCZ34701EWR2?
MCZ34701EWR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCZ34701EWR2 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 MCZ34701EWR2?
For technical support, including MCZ34701EWR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCZ34701EWR2 requirements.
6.How does Aetrix verify that MCZ34701EWR2 is sourced from the original manufacturer or authorized distributors?
All MCZ34701EWR2 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 MCZ34701EWR2 meets industry standards.
7.What is the process for return or replacement of MCZ34701EWR2?
All MCZ34701EWR2 units undergo pre-shipment inspection (PSI). If there is an issue with MCZ34701EWR2, 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 MCZ34701EWR2 part is unused and in its original packaging.
Return procedure for MCZ34701EWR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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