Monolithic Power Systems Inc. MPQ8112GJ-AEC1-P

Overview

MPQ8112GJ-AEC1-P from Monolithic Power Systems is a 60V AEC-Q100 Grade 1 qualified high-side current-sense amplifier with fixed 50V/V voltage output gain, 700kHz bandwidth, 300µA typical supply current, and 0V–60V common-mode input range. It operates from 2.7V to 60V supply and is used in automotive battery monitoring, ADAS power rails, and EPS motor phase current sensing where ground-path integrity is critical.

For engineers reviewing the MPQ8112GJ-AEC1-P datasheet, MPQ8112GJ-AEC1-P pinout, MPQ8112GJ-AEC1-P application, or MPQ8112GJ-AEC1-P equivalent, key selection criteria include its fixed-gain voltage-output architecture, V5 enable/disable control pin, TSOT23-6L package thermal performance (θJA = 220°C/W), ±1% current-sense gain accuracy, and operation down to –40°C for under-hood deployment.

Technical Context

The MPQ8112GJ-AEC1-P implements a precision high-side current mirror topology with internal 1kΩ common-input resistors (RIN_1/RIN_2) and a 10kΩ internal load resistor (RIN_OUT), delivering a fixed 50V/V gain without external gain-setting components. Its V5 pin provides digital on/off control via 1.9V/2.0V UVLO thresholds, enabling low-power sleep mode with 0.2µA shutdown current.

It features built-in back-to-back clamping diodes (±400mV) across RG1–RG2 pins for overvoltage protection, and an internal compensation circuit activated below 1.2V common-mode voltage to maintain accuracy-critical for low-VCM battery monitoring during deep discharge or cold-crank conditions.

Key Specifications

Pinout & Package

MPQ8112GJ-AEC1-P is housed in a thermally enhanced TSOT23-6L package (2.9mm × 1.6mm × 0.85mm), rated MSL1, with exposed pad not connected internally. The package supports 0.57W continuous power dissipation at 25°C ambient and requires tight layout of RG1/RG2 traces adjacent to the sense resistor for optimal CMR.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX40056ATA+T and TSC2100IDR, MPQ8112GJ-AEC1-P uniquely combines 60V operation, AEC-Q100 Grade 1, fixed 50V/V gain, and V5 enable control - making it the only drop-in solution for automotive high-side battery and motor current monitoring without external level-shifting or qualification revalidation.

Availability

MPQ8112GJ-AEC1-P is available at Aetrix Electronics and suitable for Advanced Driver Assistance Systems (ADAS), Electric Power Steering (EPS), and Battery Management Units (BMU) requiring stable component supply across automotive production lifecycles.

Supply support for MPQ8112GJ-AEC1-P 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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ8112 family belongs to MPS's automotive-grade current-sense amplifier product line, engineered specifically for high-reliability, high-common-mode-voltage monitoring in electric powertrain, chassis, and ADAS subsystems.

FAQ

What is the maximum allowable sense voltage (VSENSE) for MPQ8112GJ-AEC1-P?

The absolute maximum differential input voltage (VRG1 – VRG2) is ±400mV per datasheet Absolute Maximum Ratings. For guaranteed accuracy, VSENSE must not exceed 200mV - this ensures total output error remains within ±2% across temperature and supply variations, as verified in Typical Performance Characteristics on page 7.

Can MPQ8112GJ-AEC1-P operate with VCM = 0V, such as during battery deep discharge?

Yes. The device activates an internal compensation circuit when VCM drops below 1.2V, driving the internal MOSFET drain high to maintain current mirror functionality. This enables accurate sensing down to 0V common-mode, as confirmed in Figure 7's "VCM = 0V" error curves and Application Information section on page 11.

Is the TSOT23-6L package lead-free and RoHS compliant?

Yes. MPQ8112GJ-AEC1-P is fully lead-free, halogen-free, and complies with the EU RoHS directive. MPS confirms green status on its Quality Assurance webpage, and the TSOT23-6L package uses matte tin plating with no exemptions applied.

How does V5 pin behavior affect system power sequencing?

V5 must be driven above 2.0V to enable the device and below 1.9V to disable it. Its 1mA minimum drive requirement means it must be sourced from a robust regulator or buffered GPIO - not a weak pull-up. During MCU reset, holding V5 low prevents false current readings and reduces system quiescent current to 0.2µA.

What is the recommended PCB layout for minimizing offset drift?

Place RG1 and RG2 pads within 0.5mm of the sense resistor terminals; use Kelvin connections to avoid trace resistance errors. Route VCC and V5 bypass capacitors (0.1µF and 10nF respectively) directly to GND with shortest possible paths. Avoid routing noisy signals under the IC or near RG1/RG2 traces per Figure 6 layout guidelines.

Does MPQ8112GJ-AEC1-P require external gain-setting resistors?

No. Unlike the MPQ8112A variant, the MPQ8112GJ-AEC1-P integrates precision 1kΩ input resistors and a 10kΩ output resistor to deliver fixed 50V/V gain. External RG1/RG2 connections serve only as Kelvin sense points - no resistor values are selected or populated for gain setting.

What failure modes are mitigated by the internal back-to-back diodes?

The ±400mV clamping diodes protect against transient overvoltage events such as load dump (ISO 7637-2 Pulse 5a), inductive kickback from relay coils, and ESD strikes. When VSENSE exceeds ±400mV, the diodes conduct - provided external RG1/RG2 limit current to <100mA - preventing gate oxide damage to the internal current mirror MOSFET.