GX5200: A cost-effective alternative to the SGM5200, specifically optimized for digital power supplies

Compared to traditional analog power supplies, the primary difference in digital power supplies lies in their control and communication components. In complex multi-system applications, digital power supplies are programmed via software to enable diverse functionalities. They are widely adopted in high-performance systems requiring precise control over multiple variables, rapid real-time response, and management of multiple analog power systems. Their scalability and reusability allow users to easily adjust operational parameters and optimize power system performance. Through real-time overcurrent protection and management, it can also reduce the number of peripheral components.

Core requirements for the analog-to-digital converter in a digital power supply architecture:

Multi-channel coordination: Simultaneous acquisition of multiple power supply parameters (voltage/current/phase) is required, with channel-to-channel offset error <0.1%

Dynamic response: Overcurrent protection delay requirement <500ns, ADC sampling rate ≥1MSPS

Noise suppression: In a switching power supply EMI environment, SNR must be >70 dB to ensure control loop stability.

The GXSC 16-channel 12-bit GX5200 offers outstanding performance and is fully suitable for digital power applications. This chip supports automatic or manual mode selection for input, with an integrated input driver buffer. The input signal is directly driven to the ADC via the buffer after passing through the MUX switch, or can be bypassed using an external input buffer. The chip includes an internal reference voltage and reference driver buffer. The internal reference voltage can directly drive the ADC through the reference buffer, or it can be bypassed using an external reference voltage. Its performance is compatible with the SGM5200 from Sunplus Microelectronics, with the following features:

Targeted advantages of the GX5200:

1. Integrated 16-channel input MUX + buffer, with channel switching time <100 ns

2. 2 MSPS per channel throughput rate (SGM5200 is 1 MSPS), combined with a 72 dB SNR to enhance real-time control accuracy

3. Built-in reference voltage temperature drift of ±20 ppm/°C, superior to SGM5200 (±25 ppm/°C)

GX5200 Performance Overview:

• Power supply voltage: VAVDD: 2.7V to 3.63V; VDVDD: 1.7V to 3.63V

• Sampling rate up to: 2MHz

• Signal-to-noise ratio (SNR): 72dB

• Spurious-free dynamic range (SFDR): 82dB

• Total harmonic distortion (THD): 74dB

• Low operating power consumption (IAVDD): 1.5mA

• Shutdown power consumption (ITotal): <1uA

• Two selectable reference input configurations: Configuration 1: 0V to 2.5V; Configuration 2: 0V to 2V

• Operating temperature range: -40°C to 125°C

• Available in QFN-32 packaging