LMP92064 Reference Design Circuit | Power Management Application Circuit

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The LMP92064 is a precision low side digital current sensor and voltage monitor with a digital SPI interface. This article mainly introduces the LMP92064 features, application range, reference design circuit and circuit analysis to help you shorten the design time.

LMP92064 features:

The analog front end (AFE) includes a precision current sense amplifier and a buffer voltage channel for measuring the load current of the shunt resistor and the supply voltage of the load. The device simultaneously samples current and voltage channels through a separate 125kSps, 12-bit ADC converter for extremely accurate power calculations in unidirectional sensing applications.

• 2 12-bit simultaneous sampling analog-to-digital converters (ADCs)
• 12-bit current sensing channel
• 12-bit voltage channel
• Internal reference voltage
• Serial Peripheral Interface (SPI) Frequency: Up to 20MHz
• Temperature range: –40°C to 105°C
• 16-Pin Wafer Level Small Outline Leadless (WSON) Package

Typical applications for the LMP92064 include: Enterprise Server, Telecom, Power Management

LMP92064 internal structure block diagram:

LMP92064 reference design circuit:

LMP92064 application circuit analysis: In this example, the LMP92064 is used to sense the load current flowing through the sense resistor, R1. Additionally, the voltage across R3 can be sensed to calculate the bus voltage. The load that will be monitored is operating from a –48-V bus. Because the GND pin of the LMP92064 is connected to the –48-V bus, –48 V becomes the ground reference for the device.

LMP92064 Chinese information: click to download

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