Monolithic Power Systems Inc. MP6507GF-Z

Overview

MP6507GF-Z 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 700mA per channel. It features internal charge pump, 1.1mA quiescent current, thermal shutdown with over-temperature flag, and supports both external PWM and internal constant-off-time current control for POS printers and battery-powered cameras.

For engineers reviewing the MP6507GF-Z datasheet, MP6507GF-Z pinout, MP6507GF-Z application, or MP6507GF-Z equivalent, key selection criteria include its 500mΩ high-side/low-side R_DS(on), 27µs constant off-time, 185mV current-sense threshold, and TSSOP-EP 16-pin thermal package - all critical for compact, thermally constrained stepper control designs.

Technical Context

The MP6507GF-Z implements two independent full-bridge drivers with synchronous rectification during slow-decay current decay, reducing power loss versus body-diode conduction. Its internal charge pump enables high-side N-MOSFET gate drive without external bootstrap components.

Current regulation operates via either externally applied logic-level PWM signals (AIN1/AIN2/BIN1/BIN2) or internal constant-off-time control using external sense resistors (SENA/SENB) and a 185mV trip threshold. Blanking time (2.7µs) prevents false current-limit triggering during switching transitions.

Key Specifications

Pinout & Package

TSSOP16-EP (5.0mm × 6.4mm) with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (θ_JA = 45°C/W).

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, MP6507GF-Z uniquely balances 700mA drive, ultra-low sleep current, thermal flag visibility, and compact TSSOP-EP packaging - making it optimal for cost-sensitive, thermally constrained, battery-operated stepper systems.

Availability

MP6507GF-Z is available at Aetrix Electronics and suitable for POS printers, video security cameras, and digital still cameras requiring stable component supply across production lifecycles.

Supply support for MP6507GF-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.

The MP6507 belongs to MPS's motor driver product line, engineered specifically for compact, efficient bipolar stepper control in portable and embedded imaging equipment.

FAQ

What is the minimum supply voltage required for MP6507GF-Z to operate correctly?

The MP6507GF-Z requires a minimum supply voltage of 2.7V to ensure proper gate drive, internal LDO regulation, and current-sense amplifier functionality. Below this threshold, under-voltage lockout disables outputs to prevent undefined behavior. Operation at 2.7V delivers full 700mA capability only at reduced ambient temperature due to R_DS(on) increase.

How does the internal charge pump function, and what external component is required?

The internal charge pump generates a boosted voltage for high-side N-MOSFET gate drive, eliminating need for external bootstrap circuitry. A 10nF to 100nF ceramic capacitor must be placed between BST and VIN pins; 22nF X7R is recommended for stability across temperature and voltage.

Can MP6507GF-Z drive unipolar stepper motors?

No - MP6507GF-Z is designed exclusively for bipolar stepper motors with center-tapped or dual-winding configurations. Its dual full-bridge topology cannot replicate the unipolar current-steering scheme; attempting unipolar connection risks incorrect winding energization and torque loss.

What is the purpose of the blanking time (T_BLANK), and how is it implemented?

T_BLANK (2.7µs typ.) disables the current-sense comparator immediately after bridge switching to ignore transient spikes from MOSFET body diode reverse recovery. It is fixed internally and not user-adjustable, ensuring robust current limiting without external timing components.

Does MP6507GF-Z support microstepping, and if so, how is it achieved?

MP6507GF-Z does not natively generate microstep waveforms but supports microstepping via precise external PWM sequencing on AIN1/AIN2/BIN1/BIN2 inputs. The internal current regulator maintains accurate amplitude, enabling smooth 1/4-, 1/8-, or 1/16-step resolution when driven by a capable MCU timer subsystem.

How is thermal performance affected by the exposed pad connection?

The exposed thermal pad must be soldered to a dedicated PCB copper pour tied to GND. With ≥4 thermal vias (0.3mm diameter) connecting to inner ground planes, θ_JA improves from 90°C/W (standard TSSOP) to 45°C/W - enabling 2.8W continuous dissipation at +85°C ambient without derating.

What failure modes trigger the FAULT pin, and how is recovery handled?

Only junction over-temperature (>165°C) asserts the open-drain FAULT pin low. Recovery occurs automatically when die temperature falls to ~150°C (15°C hysteresis); no reset or power cycle is needed. UVLO and current-limit faults do not activate FAULT - they only disable outputs temporarily.