LMP92064

INCP

INCN

INVP

INVG

48V

System

Management

Control Unit

SPI Bus

GND

VDD

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LMP92064

SNOSCX0A – JUNE 2013 – REVISED DECEMBER 2014

LMP92064 Precision Low-Side, 125-kSps Simultaneous Sampling,

Current Sensor and Voltage Monitor With SPI

1 Features

3 Description

The LMP92064 is a precision low-side digital current

1

•

Two Simultaneous Sampling 12-Bit ADCs

sensor and voltage monitor with a digital SPI

–

Conversion Rate: 125 kSps (Minimum)

interface. This analog frontend (AFE) includes a

•

12-Bit Current Sense Channel

precision current sense amplifier to measure a load

current across a shunt resistor and a buffered voltage

–

Input-referred Offset: ±15

μV

channel to measure the voltage supply of the load.

–

Common-mode Voltage Range: –0.2 V to 2 V

The current and voltage channels are sampled

–

Maximum Differential Input Voltage: 75 mV

simultaneously by independent 125-kSps, 12-bit ADC

converters,

allowing

for

very

accurate

power

–

Fixed Gain: 25 V/V

calculations in unidirectional sensing applications.

–

Gain Error: ±0.75% (Maximum)

The

LMP92064

includes

an

internal

2.048-V

–

Bandwidth (–3dB): 70 kHz

reference for the ADCs, eliminating the need of an

–

DC PSRR: 100 dB

external reference and reducing component count

–

DC CMRR: 110 dB

and board space.

•

12-Bit Voltage Channel

A host can communicate with the LMP92064 using a

–

INL: ±1 LSB

four-wire SPI interface running at speeds of up to

20 MHz. The fast SPI interface lets the user take

–

Offset Error: ±2 mV (Maximum)

advantage of the higher bandwidth ADC to capture

–

Gain Error: ±0.75% (Maximum)

fast varying signals. The four-wire interface with

–

Maximum Input Voltage: 2.048 V

dedicated unidirectional input and output lines also

allows for an easy interface to digital isolators in

–

Bandwidth: 100 kHz

applications where isolation is required.

•

Internal Reference

The LMP92064 operates from a single 4.5-V to 5.5-V

•

SPI Frequency: Up to 20 MHz

supply and includes a separate digital supply pin. The

•

Temperature Range: –40°C to 105°C

LMP92064 is specified over a temperature range of

•

16-Pin WSON Package

–40°C to 105°C, and is available in a 5-mm x 4-mm

16-Pin WSON package.

2 Applications

Device Information(1)

•

Enterprise Servers

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Telecommunications

LMP92064

WSON (16)

5.00 mm x 4.00 mm

•

Power Management

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

Simplified Schematic

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.