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.
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.
Input, Output Voltages, and Load Current Requirements
SNVU769A – SEPTEMBER 2021 – REVISED OCTOBER 2022
LP877451Q1EVM Evaluation Module
3
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