Overview
The CS5308GDWR28 from ON Semiconductor is a highly integrated DC/DC controller designed to meet the demands of low voltage, high current loads with fast transient requirements. This controller utilizes the Enhanced V2 topology, which combines peak current-mode control with an internal PWM ramp and fast-feedback directly from VCORE. This architecture enhances transient response, simplifies design, and reduces overall system cost. The CS5308 includes features such as VTT monitoring, VTT Power Good (VTTPGD), Power Good (PWRGD), and internal MOSFET gate drivers, providing a fully integrated solution for power management.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Junction Temperature | - | - | 150 | °C |
| Lead Temperature Soldering (Reflow) | - | - | 230 | °C |
| Storage Temperature Range | -65 | - | 150 | °C |
| Package Thermal Resistance (Junction-to-Ambient) | - | - | 75 | °C/W |
| ESD Susceptibility (Human Body Model) | - | - | 2.0 kV | - |
| Operating Frequency Range | 200 kHz | - | 800 kHz | - |
| Voltage Identification DAC Accuracy | - | - | ±1.0% | - |
| Power Good Output Fault Delay | 25 μs | 50 μs | 100 μs | - |
| Current Sense Amplifier Bandwidth | 1.0 MHz | - | - | - |
Key Features
- Enhanced V2 Control Method: Combines traditional V2 topology with peak current-mode control for fast transient response and current sensing capability.
- Internal PWM Ramp and Fast-Feedback: Enhances transient response and simplifies design by providing fast-feedback directly from VCORE to the internal PWM comparator.
- 5-Bit DAC with 1% Tolerance: Allows for precise voltage regulation.
- Adjustable Output Voltage Positioning: Enables adaptive voltage positioning based on load conditions.
- Multi-Phase Architecture: Reduces input and output filter ripple, allowing for smaller filter components and increased output inductor current slew rate.
- Current Sensing: Current sensed through sense resistors or output inductors.
- Adjustable Hiccup Mode Current Limit: Provides flexible current limiting options.
- Overvoltage Protection: Implemented through synchronous MOSFETs.
- Individual Current Limits for Each Phase: Ensures balanced current distribution across phases.
- On-Board Current Share Amplifiers: Facilitates current sharing among phases.
- VTT Monitoring and VTT Power Good (VTTPGD): Monitors and reports the status of VTT voltage.
- Power Good (PWRGD) and VCORE Power Good: Indicates the power status of the output voltage.
- On/Off Control through COMP Pin: Allows for easy control of the controller's operation.
- Improved Noise Immunity: Enhances the controller's robustness against noise.
Applications
The CS5308GDWR28 is particularly suited for high-current, low-voltage applications such as:
- Server and Data Center Power Supplies: Where high efficiency and fast transient response are critical.
- High-Performance Computing Systems: Including workstations and high-end desktop computers.
- Telecommunications Equipment: Where reliable and efficient power management is essential.
- Industrial Power Supplies: Requiring robust and flexible power management solutions.
Q & A
- What is the operating frequency range of the CS5308GDWR28?
The operating frequency range is from 200 kHz to 800 kHz, set by a resistor connected to the ROSC pin.
- What is the Enhanced V2 control method used in the CS5308GDWR28?
The Enhanced V2 control method combines traditional V2 topology with peak current-mode control for fast transient response and current sensing capability.
- How does the CS5308GDWR28 achieve current sharing among phases?
Current sharing is accomplished by referencing all phases to the same CSREF and COMP pins, ensuring that phases with larger current signals turn off earlier than those with smaller current signals.
- What is the purpose of the internal PWM ramp in the CS5308GDWR28?
The internal PWM ramp compensates for propagation delays, allowing for smaller external ramps, lower minimum pulse widths, higher frequency operation, and PWM duty cycles above 50% without external slope compensation.
- How does the CS5308GDWR28 protect against overvoltage conditions?
The CS5308GDWR28 implements overvoltage protection through synchronous MOSFETs.
- What is the function of the VTT monitoring and VTTPGD in the CS5308GDWR28?
VTT monitoring and VTTPGD (VTT Power Good) monitor and report the status of the VTT voltage, ensuring proper operation and signaling any faults.
- Can the CS5308GDWR28 be used in single-phase configurations?
While the CS5308GDWR28 is designed for multi-phase applications, it can be used in single-phase configurations, but it may not fully utilize its multi-phase benefits.
- How does the CS5308GDWR28 handle current limiting?
The CS5308GDWR28 features adjustable hiccup mode current limiting and individual current limits for each phase, ensuring robust current management.
- What is the significance of the 5-bit DAC in the CS5308GDWR28?
The 5-bit DAC provides precise voltage regulation with a 1% tolerance, allowing for accurate output voltage setting.
- How does the CS5308GDWR28 improve noise immunity?
The CS5308GDWR28 is designed with improved noise immunity features to enhance its robustness against noise and ensure reliable operation.
