How to Validate PMIC Low-Voltage Output Regulation

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Benchtop DC Electronic Load
+ Benchtop DC Electronic Load
Benchtop DC Electronic Load
+ Benchtop DC Electronic Load

Characterize Low-Voltage PMIC Output Rails

Power management integrated circuit (PMIC) output regulation testing requires supplying the device with controlled input power while applying defined current loads to the regulated output rail. Establish the required input voltage and PMIC operating configuration, then connect a programmable electronic load to the output under test using remote sensing where appropriate to reduce the effect of voltage drop in the load connections. Apply a sequence of output-current levels while measuring voltage directly at the regulated rail. The resulting measurements characterize how the output voltage changes from light load through higher-current operating points and establish the relationship between load current and regulated output voltage across the selected operating range.

Dynamic measurements extend the test by transitioning the electronic load between defined current levels while capturing output voltage and load current as functions of time. Program the initial current, final current, transition timing, and slew rate according to the required load profile, then correlate the current transition with voltage deviation and recovery at the PMIC output. Repeat the sequence at different input voltages and output-current levels to characterize regulation and transient behavior across the intended operating conditions. For very low output voltages, verify that each voltage-current combination remains within the electronic load's low-voltage operating region, since available sink current and transient performance can decrease as the voltage across the load approaches its minimum operating limit.

PMIC Output Regulation Validation Solution

Testing low-voltage PMIC output regulation requires applying controlled input power and repeatable output-current conditions while measuring rail voltage throughout static and dynamic load changes. The solution uses a Keysight triple-output DC power supply to provide controlled power to the device under test and a Keysight benchtop DC electronic load to apply programmed current levels to the regulated output rail. Defined current levels, transition timing, and slew rates reproduce changing load conditions, while a Keysight oscilloscope captures time-correlated output-voltage and current behavior. Recorded measurements show load regulation, transient deviation, recovery, and settling across each programmed operating condition. This approach supports repeatable PMIC rail characterization across multiple input voltages, output-current levels, and dynamic load sequences.
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See Block Diagram of PMIC Output Regulation Validation Solution

Block Diagram of PMIC Output Regulation Validation Solution

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