SNVU769A September   2021  – October 2022

 

  1.   Abstract
  2.   Trademarks
  3. 1Top View with Basic External Connections
  4. 2Input, Output Voltages, and Load Current Requirements
  5. 3Jumpers and connectors
    1. 3.1 Test Points
  6. 4Getting Started
    1. 4.1 GUI
    2. 4.2 GUI Installation and working with GUI
  7. 5Watchdog
  8. 6Schematics, Layout and BOM
    1. 6.1 Schematic Diagram
    2. 6.2 PCB Layer Diagram
    3. 6.3 Components List
  9. 7Revision History

2 Input, Output Voltages, and Load Current Requirements

LP87745-Q1 device works with 3.3 V input supply and supply is internally monitored for undervoltage (UV) and overvoltage (OV) conditions and hence keep the input supply voltage within 3.3 V +/- 8 % to avoid input supply UV/OV detection. Input power plane to the PMIC has option for additional filtering using L1 and L2 on the bottom side of the PCB.

  • If the VBAT/preregulator path is used (default configuration), input supply to the device is already regulated to 3.3 V.
  • If external 3.3 V supply is used, ensure that input supply voltage is always within the recommended voltage range and drop across supply path must be considered.
  • If EVM is configured to work with USB supply, regulators should not be loaded.

Table 2-1 lists the input and output voltage for each regulator and their maximum load-current requirements. Refer LP87745-Q1 device data sheet for more information about device electrical characteristics and its features.

Table 2-1 Input and Output Voltages, and Load Current Requirements
Regulator Name Input Supply Voltage at PMIC Supply Pin Output Voltage Maximum Load Current
BUCK1 3.04 V - 3.56 V 1.8 V 3 A
BUCK2 3.04 V - 3.56 V 1.0 V 3 A
BUCK3 3.04 V - 3.56 V 1.2 V 3 A
BOOST 3.04 V - 3.56 V 5 V 0.3 A
VIO_LDO 5 V (Generated from BOOST) 3.3 V 0.150 A

If all the regulators are loaded with maximum load current simultaneously, PMIC and PCB can become hot. Make sure that PMIC junction temperature does not exceed 150 °C.