MxL7704 Five Output Universal PMIC QFN-EP

MxL7704 Five Output Universal PMIC QFN-EP is a highly integrated, programmable Power Management Integrated Circuit (PMIC) optimized for powering high-performance microprocessors, FPGAs, DSPs, and ASICs from a standard 5V supply rail. This advanced power management solution embeds four synchronous step-down buck regulators alongside a clean 100mA Low Dropout (LDO) linear regulator. Consequently, it delivers five independent, precisely controlled output voltage rails while minimizing PCB space and component count. Designers frequently utilize this chip in compact computing architectures like the Raspberry Pi 4, where the device manages complex core, memory, and peripheral power rails flawlessly. Furthermore, its onboard I²C interface allows for dynamic voltage scaling and extensive diagnostic monitoring. Therefore, you should choose the MxL7704 to achieve peak power efficiency and highly flexible, state-machine-controlled sequencing in your embedded system designs.

Key Features:

• Five Regulated Outputs: Features four highly efficient synchronous buck switchers alongside a low-noise 100mA LDO to power complete processor sub-systems.
• Flexible Sequencing Engine: Incorporates a conditional, state-machine-based startup and shutdown sequencing tool suitable for virtually any modern multi-rail SoC.
• Dynamic Voltage Scaling: Supports I²C-controlled real-time adjustments of core voltages, which significantly lowers power consumption during idle processing states.
• Integrated Telemetry: Includes an onboard 8-bit Analog-to-Digital Converter (ADC) that handles system temperature monitoring and precise voltage measurements.
• Thermally Enhanced Package: Housed in a compact, 32-pin QFN-EP package featuring an exposed pad for efficient heat dissipation under heavy loads.

Technical Specifications:

• Input Voltage Range (V_IN): 4.0 V to 5.5 V
• Buck 1 Output Power: 3.0 V to 3.6 V (1.5 A current capacity)
• Buck 2 Output Power: 1.3 V to 1.92 V (1.5 A current capacity)
• Buck 3 Output Power: 0.8 V to 1.6 V (2.5 A current capacity)
• Buck 4 Output Power: 0.6 V to 1.4 V (4.0 A current capacity)
• LDO Output Current: 100 mA (Configurable from 1.5 V to 3.6 V)
• Switching Frequency Range: Programmable from 1 MHz to 2.1 MHz
• Output Accuracy: ±2% maximum total DC output error over line, load, and temperature
• Control Interface: 400 kHz standard/fast mode I²C port

Mechanical Specifications:

• Package Type: QFN-32 (Quad Flat No-Leads with Exposed Pad)
• Pin Count: 32 pins
• Mounting Method: Surface Mount Technology (SMT)
• Thermal Pad: Large bottom-side grounded metal pad for optimized thermal management
• Moisture Sensitivity Level: MSL3 standard protection

Dimensions:

• Package Length: 5.00 mm ±0.10 mm
• Package Width: 5.00 mm ±0.10 mm
• Package Thickness: ≈ 0.85 mm
• Lead Pitch: 0.50 mm spacing

Pinout and Wiring:

• VIN Pins: Connect to the primary 5V DC power supply line, placing local decoupling capacitors nearby.
• LX1 / LX2 / LX3 / LX4: Connect directly to external power inductors for each respective buck switcher channel.
• FB1 / FB2 / FB3 / FB4: Route these voltage feedback pins directly to the output filter capacitors to maintain regulation.
• SCL / SDA: Connect to the I²C clock and data bus lines of your host microcontroller using 4.7 kΩ pull-up resistors.
• PGOOD1 / PGOOD2: Configurable power-good flag outputs used to trigger external reset lines or status indicators.
• Exposed Thermal Pad: Solder this large center pad directly to an expansive PCB ground plane to prevent overheating.

Datasheet Reference:

• Download MaxLinear MxL7704 Five Output Universal PMIC Datasheet

Commonly Used in:

• Single Board Computers: Serves as the principal power distribution hub for boards like the Raspberry Pi 4 Model B.
• FPGA Development Kits: Powering entry-level multi-rail Xilinx Zynq UltraScale+ or Intel Cyclone devices.
• Industrial Controller Core Boards: Providing clean, sequenced voltage rails for high-reliability automation modules.

Applications:

• Embedded System Power: Distributing stable core, memory, and peripheral logic power in dense network architectures.
• Point-of-Load Regulation: Transforming raw 5V bus inputs down to sub-volt levels for sensitive modern digital logic.
• Telemetry-Driven Power Systems: Utilizing the internal ADC for continuous tracking of device diagnostics and thermal status.

Equivalent Models:

• MxL7704-X: Pre-programmed model variation factory-optimized specifically for Xilinx Zynq UltraScale+ (ZU2 and ZU3) MPSoCs.
• MxL7704-A: Standard pre-programmed option tailored with power sequences matching conventional ARM Cortex-A series processors.
• MxL7704-B: The updated iteration of the silicon architecture, however, you must check register default maps for software cross-compatibility.

Package Includes:

• 1 x MxL7704 Five Output Universal PMIC QFN-EP IC