General Description

The MCP16503 is an optimally integrated PMIC, for general purpose eMPUs (Embedded Microprocessor Units), requiring Dynamic Voltage Scaling (DVS). The regulators' Start-up voltages are adjustable using selection resistors, and the regulators can be fully adjusted by using I²C. The MCP16503 integrates four DC-DC Buck regulators and two auxiliary LDOs, and provides a comprehensive interface to the MPU, which includes an interrupt flag and a 1 MHz I²C interface.

All Buck channels can support loads up to 1A and are 100% duty cycle capable. Two 300 mA LDOs are provided such that sensitive analog loads can be supported. Unlike MCP16502, the MCP16503 comes with a simple logic level EN pin, which simplifies the start-up procedure, being able to start even when the input voltage ramps slowly or when the input voltage is unstable and suddenly drops below UVLO. After the initial Start-up, the PMIC can be shutdown and started by the MPU, using the PWRHLD pin. This method allows greater precision in the output voltage setting by eliminating inaccuracies due to external feedback resistors while minimizing external component count. The voltage selection set allows easy migration across different generations of memory. The default power channel sequencing is built-in according to the requirements of the MPU, starting from buck1 and LDOx, buck2, buck3, and buck4. A dedicated pin (LPM) facilitates the transition to Low-Power mode and the implementation of Backup mode with DDR in self-refresh (Hibernate mode). The MCP16503 features a low no-load operational quiescent current and it draws less than 10 μA in full shutdown. Active discharge resistors are provided on each output. All Buck channels support safe start-up into pre-biased outputs. The MCP16503 is available in a 32-pin 5 × 5 mm VQFN package with an operating junction temperature range from −40°C to +125°C.