1 Features
• AEC-Q100 qualified with the following results:
– Device temperature grade 1: –40°C to +125°C
ambient operating temperature
• Functional safety-compliant device
– Developed for functional safety applications
– Documentation available to aid 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 rail
– Q&A watchdog
– Level or PWM error signal monitor (ESM)
– BIST and CRC
• 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
• Short and medium range corner radar
• Long range front radar
• Ultra-short range radar
• Low ripple, low noise applications

3 Description
The LP87745-Q1 device is designed to meet the
power management requirements of the AWR and
IWR MMICs in various automotive and 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.
This 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-ofload
(POL) which improves the accuracy of the output
voltage.