1 Features
• Device operating temperature : –40°C to +125°C
ambient
• Input voltage: 3.3 V nominal (3 V to 4 V range)
• Three low-noise step-down DC/DC converters:
– Output voltage: 0.9 V to 1.9 V, 0.8 V (BUCK3),
0.82 V (BUCK3)
– Maximum output current: 3 A/ 3 A/ 3 A
– Switching frequency: 4.4 MHz, 8.8 MHz, and
17.6 MHz
• 5 V boost converter
– Maximum output current: 350 mA
• 150 mA LDO
– Output voltage 1.8 V or 3.3 V
• Output short-circuit and overload protection
• Input overvoltage protection (OVP) and
undervoltage lockout (UVLO)
• Overtemperature warning and protection
• Serial peripheral interface (SPI)

2 Applications
• Factory automation & control
• Industrial transport (non-car & non-light truck)
• Low ripple, low noise applications

3 Description
The LP8774x device is designed to meet the power
management requirements of the IWR MMICs in
various industrial radar applications. The device has
three step-down DC/DC converters, a 5-V boost
converter and a 1.8 V or 3.3 V LDO. The LDO is
powered from the boost and intended for xWR I/O
supply. An SPI serial interface and enable signals
control the device.
The step-down DC/DC converters support
programmable switching frequency of 4.4 MHz, 8.8
MHz, or 17.6 MHz. High switching frequency and low
noise across wide frequency range enable LDO-free
power solution with minimal or no passive filtering.
The high switching frequency improves thermals and
transient settling for the MMIC RF rails. The device
forces the switching clock into PWM mode for optimal
RF performance and can also be synchronized to an
external clock. The device supports remote voltage
sensing to compensate IR drop between the regulator
output and the point-of-load (POL) which improves the
accuracy of the output voltage.