Monolithic Power Systems Inc. MP9517GJS-P

Overview

MP9517GJS-P from Monolithic Power Systems is a single-phase brushless DC motor driver IC with integrated Hall-effect sensor, power MOSFETs, and full protection circuitry. It operates from 3.3V to 18V, delivers up to 2A output current limit, features fixed 26kHz switching frequency, soft-on/off commutation (22.5°/45°), and open-drain FG speed indicator output - designed for compact CPU fan control in servers and desktop PCs.

For engineers reviewing the MP9517GJS-P datasheet, MP9517GJS-P pinout, MP9517GJS-P application, or MP9517GJS-P equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and over-current protection thresholds, real-world timing behavior (rotor lock detection at 0.6s), and package-specific layout guidance for TSOT23-6-SL.

Technical Context

The MP9517GJS-P integrates a Hall-effect sensor aligned at (540µm, 508µm, 80µm) within the TSOT23-6-SL package to detect rotor position and synchronize phase commutation. Its internal half-bridge drives OUT1 and OUT2 with total R_DS(on) of 1.02Ω (HS+LS), enabling direct connection to single-phase BLDC motors without external gate drivers.

Control logic implements adaptive PWM-to-output duty mapping with 7.8%–9% startup hysteresis, 2kHz–100kHz input PWM compatibility, and automatic BEMF/current zero-crossing alignment. Protection includes UVLO (3.25V rising), OVP (19V trip), thermal shutdown (150°C), rotor deadlock recovery (0.6s detection + 3.6s hold), and reverse voltage blocking.

Key Specifications

Pinout & Package

MP9517GJS-P is packaged in TSOT23-6-SL - a 6-pin, 1.6mm × 2.9mm surface-mount package with exposed pad for thermal enhancement and pin 1 located at lower-left corner when top marking is read left-to-right.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-phase BLDC motor driver applications.

Compared with MP6532GJ-Z and DRV10970RGET, MP9517GJS-P uniquely combines integrated Hall sensing, reverse-voltage blocking, rotor lock auto-recovery, and 26kHz silent switching in a 6-pin TSOT23 package - making it optimal for cost-sensitive, space-constrained CPU fan designs requiring zero external sensing components.

Availability

MP9517GJS-P is available at Aetrix Electronics and suitable for CPU fan control, server chassis cooling, industrial blower systems, and embedded thermal management requiring stable component supply across production lifecycles.

Supply support for MP9517GJS-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, including DC/DC converters, motor drivers, and LED controllers - headquartered in Kirkland, WA, with global design and support centers.

The MP9517 belongs to MPS's integrated BLDC motor driver product line, engineered specifically for ultra-compact, low-noise, self-contained fan control in computing and communications infrastructure where board space, acoustic performance, and reliability are critical.

FAQ

What is the minimum PWM duty cycle required to start motor rotation?

The MP9517GJS-P requires ≥9% PWM duty cycle to initiate rotation, with 1.2% hysteresis below which the motor remains stationary. This threshold is fixed in silicon and does not vary with temperature or supply voltage; startup occurs only after Hall signal edges confirm rotor presence and position.

Does MP9517GJS-P require an external pull-up resistor on the FG pin?

Yes - the FG pin is open-drain and must be pulled up externally (typically 4.7kΩ to 5V or 3.3V) to generate valid speed pulses. Without pull-up, FG remains floating and cannot drive tachometer circuits or microcontroller input pins reliably.

How does rotor deadlock protection recover after triggering?

Upon detecting no Hall edge for 0.6s, MP9517GJS-P turns on both low-side MOSFETs for 3.6s, then attempts automatic restart. FG resumes output only after three consecutive Hall signal edges are detected - ensuring mechanical clearance before re-engaging commutation.

What is the thermal resistance (θ_JA) for the TSOT23-6-SL package?

The junction-to-ambient thermal resistance (θ_JA) for MP9517GJS-P in TSOT23-6-SL is 100°C/W when mounted on a standard 4-layer JEDEC JESD51-7 PCB. With proper copper pour and thermal vias under the exposed pad, θ_JC is 55°C/W, enabling 1.25W continuous dissipation at 25°C ambient.

Can MP9517GJS-P drive motors outside the 3.3V–18V range?

No - operation outside 3.3V–18V violates recommended conditions. Absolute maximum VCC is ±22V, but UVLO activates at 3.25V (rising) and OVP trips at 19V. Below 3.3V or above 18V, the device may fail to start, stall, or enter undefined states; sustained overvoltage risks permanent damage.

Is the Hall sensor position fixed within the TSOT23-6-SL package?

Yes - the Hall-effect sensor cell is physically located at (X,Y,Z) = (540µm, 508µm, 80µm) relative to the package datum, as specified in the datasheet. This fixed placement ensures consistent magnetic field sensitivity and eliminates calibration requirements during PCB layout.

What happens during input reverse voltage connection?

When VCC is connected with reverse polarity (e.g., –18V), MP9517GJS-P immediately disables all internal circuitry, draws only 1mA reverse supply current, and holds shutdown until correct polarity is restored - preventing latch-up or oxide damage to internal MOSFETs and Hall sensor.