LP877451A1RXVRQ1

The LP87745-Q1 device is designed to meet the power management requirements of AWR and IWR MMICs in various automotive and industrial applications. The device integrates three step-down DC/DC converters, one 5 V boost converter, and one 1.8 V or 3.3 V LDO. The LDO is powered by the boost converter and supplies the xWR I/O. The device is controlled via an SPI serial interface and enable signals. The step-down DC/DC converters support a programmable switching frequency, configurable to 4.4 MHz, 8.8 MHz, or 17.6 MHz. High switching frequencies and low noise across a wide frequency range enable an LDO-free power solution requiring minimal or no passive filtering. This improves both thermal performance and transient settling performance on the MMIC RF power rails. The device forces the switching clock into PWM mode for RF performance and can also be synchronized to an external clock. The device supports remote voltage sensing to compensate for IR drop between the regulator output and the point-of-load (POL), thereby improving output voltage accuracy. The LP87745-Q1 device supports programmable startup and shutdown delays and sequences, synchronized to the enable signal. The sequences can also include GPO signals for controlling external regulators, load switches, and processor resets. Default device settings are programmed into non-volatile memory (NVM). The device controls the output slew rate to minimize output voltage overshoot and inrush current during startup.

Applications

• Low ripple, low noise applications

Key features

• AEC-Q100 qualified, device temperature grade 1, ambient operating temperature range -40°C to +125°C
• Functional safety compliant, developed for functional safety applications; documentation available to support ISO 26262 functional safety system design up to ASIL-C/SIL-2
• Input supply overvoltage and undervoltage monitoring
• Regulator output overvoltage and undervoltage monitoring
• Overvoltage and undervoltage monitoring for one external power rail
• Integrated question-and-answer watchdog
• Level or PWM error signal monitoring (ESM)
• Integrated BIST and CRC
• Nominal input voltage 3.3 V, input voltage range 3 V to 4 V
• Three integrated low-noise step-down DC/DC converters, output voltage range 0.9 V to 1.9 V, BUCK3 supports 0.8 V or 0.82 V output, maximum output current 3 A per channel, switching frequency options: 4.4 MHz, 8.8 MHz, 17.6 MHz
• Integrated 5 V boost converter, maximum output current 350 mA
• Integrated 150 mA LDO, output voltage selectable: 1.8 V or 3.3 V
• Output short-circuit and overload protection
• Input OVP and UVLO
• Overtemperature warning and protection
• SPI support