Monolithic Power Systems Inc. MP8110DK-LF-Z

Overview

MP8110DK-LF-Z from Monolithic Power Systems is a precision high-side current-sense amplifier operating from 2.5V to 40V supply, featuring 1.4V–40V input common-mode range independent of V_CC, 400µV typical input offset voltage, 12µA typical supply current, and dual buffered outputs (OUT1 for resistive loads, OUT2 for capacitive loads). It enables accurate battery discharge monitoring in portable systems without disrupting ground paths.

For engineers reviewing the MP8110DK-LF-Z datasheet, MP8110DK-LF-Z pinout, MP8110DK-LF-Z application, or MP8110DK-LF-Z equivalent, key selection criteria include common-mode voltage resilience during deep battery discharge, low quiescent current for energy-constrained designs, dual-output drive capability, and MSOP-8 thermal performance in space-limited layouts.

Technical Context

The MP8110 employs a precision current-sense architecture with integrated P-channel MOSFET gate control and dual output buffers. Its input stage maintains operation down to 1.4V common-mode voltage-critical for monitoring 2-cell Li-ion packs at end-of-discharge-while rejecting supply variations via 97dB PSRR.

It delivers two distinct output signals: OUT1 provides low-impedance current-source drive (500µA max) optimized for resistor-based sensing networks, while OUT2 supplies higher-current (5mA max), rail-to-rail voltage output suitable for driving ADC inputs or capacitive signal chains with 26µs rise/fall times.

Key Specifications

Pinout & Package

MP8110DK-LF-Z is housed in an 8-pin MSOP package (3.0mm × 3.0mm, 0.65mm pitch), optimized for thermal dissipation (θ_JA = 150°C/W) and PCB area efficiency in portable electronics.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current-sense amplifier applications.

Compared with INA219BIDR and MAX4080TASA+, MP8110DK-LF-Z uniquely combines ultra-low quiescent current, dual analog outputs, and deep common-mode operation-making it optimal for analog-intensive, battery-constrained systems requiring both precision feedback and flexible signal routing.

Availability

MP8110DK-LF-Z is available at Aetrix Electronics and suitable for portable PCs, smart battery packs, and portable test equipment requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.

Supply support for MP8110DK-LF-Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP8110 belongs to MPS's precision current-sensing product line, engineered specifically for high-accuracy, low-power, high-voltage battery monitoring in portable and energy-critical systems.

FAQ

What is the minimum input common-mode voltage supported by MP8110DK-LF-Z?

The MP8110DK-LF-Z supports a minimum input common-mode voltage of 1.4V, verified across temperature and supply conditions. This enables reliable current sensing on deeply discharged 2-cell Li-ion batteries (down to ~2.8V total) without loss of functionality or increased offset drift.

Can MP8110DK-LF-Z operate with a 2.5V supply while sensing at 1.4V common-mode?

Yes. The input common-mode range (1.4V–40V) is fully independent of V_CC. At V_CC = 2.5V, the device maintains full functionality and specified offset (≤2mV) at 1.4V common-mode, confirmed in electrical characteristics tables and typical performance curves.

What is the functional difference between OUT1 and OUT2 pins?

OUT1 is a current-output stage (max 500µA) designed for direct connection to gain-setting resistors or precision I-to-V converters. OUT2 is a voltage-output buffer (rail-to-rail, 5mA drive) intended for ADC inputs, comparators, or RC filter networks-enabling simultaneous analog signal processing paths.

Is the NC pin (Pin 2) safe to connect to ground or leave floating?

Pin 2 is internally unconnected and must remain unconnected-neither grounded nor tied to any net. Connecting it may cause unpredictable behavior or violate internal isolation boundaries, as explicitly stated in the Pin Functions table of the datasheet.

How does the MP8110DK-LF-Z handle high dv/dt noise on the sense resistor?

The MP8110 incorporates inherent common-mode rejection (97dB PSRR) and internal filtering that suppresses high-frequency transients. Layout best practices-such as symmetric trace routing, local 100pF CGS capacitor, and separation from switching node traces-are recommended to maintain >60dB CMRR above 1MHz.

Does MP8110DK-LF-Z require external gain-setting resistors for basic operation?

Yes. RG1 and RG2 must be externally connected to opposite sides of the sense resistor to establish the differential input path. Gain is set by the ratio of external R_GS to RG1/RG2; omitting these resistors results in undefined operation and potential damage due to uncontrolled input bias currents.

What is the maximum allowable sense voltage (V_SENSE) across RG1–RG2?

The absolute maximum differential input voltage is 5V, but for specified accuracy, V_SENSE should be limited to ≤100mV per the Electrical Characteristics table. Exceeding 100mV increases nonlinearity and reduces current accuracy beyond the ±5% no-load error specification.