Monolithic Power Systems Inc. MP6506GQ-P

Overview

MP6506GQ-P from Monolithic Power Systems is a bipolar stepper-motor driver IC with dual integrated N-channel full-bridge MOSFETs, operating from 2.7V to 15V and delivering up to 500mA per channel. It features under-voltage lockout (2.5V rising threshold), thermal shutdown (165°C), and an over-temperature fault flag. Used in POS printers and battery-powered cameras for precise open-loop position control of 2-phase stepper motors.

For engineers reviewing the MP6506GQ-P datasheet, MP6506GQ-P pinout, MP6506GQ-P application, or MP6506GQ-P equivalent, key selection considerations include its QFN16 (3×3mm) thermally enhanced package, dual full-bridge gate logic (AIN1/AIN2/BIN1/BIN2), external PWM current control capability, and sleep mode quiescent current of 1μA at 5V.

Technical Context

The MP6506GQ-P implements two independent full-bridge drivers using internal N-channel MOSFETs with typical on-resistance of 460mΩ (HS) and 395mΩ (LS) at 25°C and VIN=5V. It employs an internal charge pump to drive high-side gates, enabling operation across the full 2.7V–15V supply range without external bootstrap components.

Control is implemented via four logic-level inputs (AIN1/AIN2/BIN1/BIN2) that directly configure bridge states - including forward, reverse, fast decay, and slow decay modes - while nSLEEP enables hardware-controlled 1μA sleep mode with ~1.5ms wake-up delay. Fault reporting is provided through an open-drain FAULT pin asserting low during thermal shutdown.

Key Specifications

Pinout & Package

MP6506GQ-P is housed in a thermally enhanced 3mm × 3mm QFN-16 package with exposed thermal pad (JEDEC MO-220 VEED-4 compliant). The pad must be soldered to a PCB ground plane with ≥4 thermal vias for reliable 500mA operation at ambient temperatures up to +85°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bipolar stepper-motor driver applications.

Compared with TB6600HG and DRV8834, MP6506GQ-P delivers optimal balance of integration, thermal performance, and low-power sleep for space-constrained 2.7V–15V portable stepper applications - offering smallest PCB footprint and lowest quiescent draw among the three.

Availability

MP6506GQ-P is available at Aetrix Electronics and suitable for POS printers, video security cameras, and digital still cameras requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MP6506GQ-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 analog and power ICs, with core expertise in DC/DC conversion, motor control, and LED drivers.

The MP6506 belongs to MPS's integrated motor driver product line, designed specifically for compact, battery-efficient bipolar stepper control in consumer imaging, automation, and portable industrial equipment.

FAQ

What is the maximum motor supply voltage supported by MP6506GQ-P?

The absolute maximum supply voltage is 18V, but the recommended operating range is 2.7V to 15V per the datasheet. Operation above 15V risks exceeding safe SOA limits and may trigger UVLO or thermal shutdown even at moderate load currents.

Does MP6506GQ-P support microstepping?

No - MP6506GQ-P supports only full-step and half-step excitation modes via direct logic-level input sequencing. Microstepping requires external current DACs or dedicated microstepping drivers like the DRV8834 or STSPIN220.

How is thermal protection implemented on MP6506GQ-P?

Thermal protection uses an on-die temperature sensor that triggers shutdown at 165°C (typical), pulling the FAULT pin low. Recovery occurs automatically at ~150°C due to 15°C hysteresis, preventing oscillation during thermal transients.

Can MP6506GQ-P drive two independent DC motors?

Yes - the dual full-bridge architecture allows independent bidirectional control of two brushed DC motors. Each bridge accepts separate IN1/IN2 signals, enabling forward/reverse and brake functionality per motor without additional components.

What capacitor value is required on the BST pin?

A ceramic capacitor between 10nF and 100nF (X7R or better) must be placed from BST to VIN. A 22nF or 47nF 0402/0603 capacitor is commonly used; placement must be within 2mm of the BST and VIN pins to ensure stable high-side gate drive.

Is the exposed thermal pad electrically connected?

Yes - the exposed pad is internally connected to GND (pin 11) and must be soldered to a PCB ground plane. It is not isolated; connecting it to any other net violates thermal and electrical specifications and risks latch-up or premature failure.

What logic levels are accepted on AIN1/AIN2/BIN1/BIN2 inputs?

Inputs accept standard TTL-compatible logic: logic low ≤0.6V and logic high ≥2.0V at VIN ≥2.7V. Input leakage is <1µA, and no external pull-ups are required unless driving from open-drain sources.