Monolithic Power Systems Inc. MP6536DU-LF-Z

Overview

MP6536DU-LF-Z from Monolithic Power Systems is a 3-channel half-bridge gate driver IC designed to control external N-channel MOSFETs in 3-phase brushless DC motor inverters. It supports 5V–26V VSP supply, delivers ±5.5A peak output current per channel, features 10ns dead time, integrated current limiting, thermal shutdown at 160°C, and open-drain fault reporting (FAULTB, FLT2B, FLT3B). Used in compact BLDC motor control modules for drones and power tools.

For engineers reviewing the MP6536DU-LF-Z datasheet, MP6536DU-LF-Z pinout, MP6536DU-LF-Z application, or MP6536DU-LF-Z equivalent, this page provides verified functional specifications, validated package mapping (QFN-40, 5mm×5mm), confirmed terminal roles, real-world motor drive context, and direct alternative part comparisons with documented electrical and protection-level differences.

Technical Context

The MP6536 operates as a logic-level-to-high-power gate driver with three independent half-bridge channels, each comprising high-side and low-side MOSFET drivers powered via bootstrap (BST1–BST3) and internal regulated gate supplies (VDR1/VDR2). All inputs accept standard 3.3V/5V CMOS logic signals with defined thresholds (e.g., PWMx low <1.0V, high >1.6V).

It integrates dual UVLO (VSP and BST), cycle-by-cycle current limiting (5.5A per SWx), thermal shutdown (160°C trip, 35°C hysteresis), and fault flagging with channel-specific monitoring (FLT2B/FLT3B) and global FAULTB. Standby (STBYB) and shutdown (SHDNB) pins enable system-level power sequencing and safe state entry.

Key Specifications

Pinout & Package

MP6536DU-LF-Z is housed in a thermally enhanced 40-pin QFN package (5mm × 5mm, 0.5mm pitch) with exposed thermal pad (PGND-connected) for efficient heat dissipation in motor drive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-channel half-bridge driver applications.

Compared with DRV8305PWP and STSPIN32F0A, MP6536DU-LF-Z offers superior voltage margin (26V), deterministic per-channel fault visibility, and minimal external components-making it optimal for discrete, high-reliability BLDC inverters where MCU resources or board space are constrained.

Availability

MP6536DU-LF-Z is available at Aetrix Electronics and suitable for electric power tools, drone propulsion systems, industrial fan controllers, and medical pump drives requiring stable component supply, consistent thermal performance, and long-term motor drive reliability.

Supply support for MP6536DU-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 MP6536 belongs to MPS's motor driver product line, engineered specifically for compact, high-efficiency 3-phase BLDC inverter stages in portable and industrial equipment where thermal robustness and fault transparency are critical.

FAQ

What is the minimum recommended bootstrap capacitor value for MP6536DU-LF-Z?

The datasheet specifies a minimum of 0.1µF ceramic capacitor between each BSTx pin and its corresponding SWx node. This value ensures sufficient charge storage for high-side gate drive during 1MHz PWM operation and maintains voltage stability across load transients. Larger values (e.g., 0.22µF) improve margin under heavy duty cycles but increase PCB area and cost.

Can MP6536DU-LF-Z drive P-channel high-side MOSFETs?

No. The MP6536DU-LF-Z is designed exclusively for N-channel high-side and low-side MOSFETs using bootstrap gate drive architecture. Its BSTx pins provide positive voltage referenced to SWx, which is incompatible with P-channel source-referenced gate drive requirements. External level-shifting circuitry would be needed-and is not supported by the IC's internal logic or protection schemes.

How does the MP6536 handle simultaneous overcurrent and thermal faults?

When both overcurrent (OCP) and thermal (OTP) faults occur, FAULTB pulls low immediately, and all affected channels enter high-impedance state. The device prioritizes OTP recovery: normal operation resumes only after junction temperature falls below 125°C, regardless of OCP clearance. FLT2B/FLT3B reflect the dominant fault condition per channel per Table 1 in the datasheet.

Is the exposed thermal pad on the QFN-40 package electrically connected?

Yes-the exposed pad is internally connected to PGND and must be soldered to a solid copper ground plane on the PCB. This connection is essential for both thermal dissipation (θJC = 8°C/W) and electrical noise immunity. Floating or unconnected pads cause excessive junction temperature rise and potential thermal shutdown during sustained 5.5A operation.

What is the purpose of the VDR1 and VDR2 pins, and how should they be bypassed?

VDR1 powers gate drivers for SW1/SW2; VDR2 powers the SW3 driver. Each supplies ~5V regulated from VSP. They must be bypassed to PGND with 0.1µF–10µF ceramic capacitors placed within 2mm of the pin. Insufficient bypassing causes gate drive instability, increased EMI, and premature fault triggering due to undershoot on internal logic rails.

Does MP6536DU-LF-Z support 100% duty cycle operation on any channel?

No. Due to bootstrap architecture, sustained 100% high-side duty cycle is impossible-BSTx voltage decays without periodic low-side conduction to recharge the bootstrap capacitor. The datasheet recommends limiting high-side on-time to ≤95% and using STBYB for true high-impedance hold states instead of attempting extended 100% PWM.

How is the 10ns dead time enforced, and is it adjustable?

The 10ns dead time is fixed and internally generated by propagation delay matching between high-side and low-side driver paths. It is not user-adjustable via external components or registers. This fixed value ensures consistent shoot-through prevention across temperature and supply voltage variations without requiring layout-dependent timing compensation.