NXP Semiconductors MC34933EPR2

Overview

MC34933EPR2 from Freescale Semiconductor is a dual-channel H-bridge motor driver IC designed for precision bipolar stepper and brushed DC motor control in compact optical systems. It delivers 1.4 A peak output current per channel, operates from 2.0 V to 7.0 V motor supply (VM), supports 3.0 V logic compatibility, and integrates shoot-through protection and thermal detection - enabling reliable auto-focus actuation in digital camera lens modules.

For engineers reviewing the MC34933EPR2 datasheet, MC34933EPR2 pinout, MC34933EPR2 application, or MC34933EPR2 equivalent, key selection criteria include its 1.0 Ω max R_DS(on) at 25 °C, independent PWM control up to 200 kHz per bridge, tri-state mode activation via VCC detect or thermal shutdown, and UQFN-16 package with exposed thermal pad.

Technical Context

The MC34933EPR2 implements two fully independent high-side/low-side MOSFET drivers per channel using Freescale's SMARTMOS process, with integrated charge pump (VG = VM + VCC) enabling high-side gate drive without external bootstrap components. Its control logic accepts standard 3.0 V CMOS-level inputs (IN1A/IN1B/IN2A/IN2B) and supports four discrete states: forward, reverse, brake, and high-impedance.

Internal protection includes VCC under-voltage detection (trip at 2.2 V typical, 0.1 V hysteresis) and thermal shutdown (activation at 170 °C typical, 20 °C hysteresis), both forcing outputs into tri-state. The device maintains <100 µA motor supply quiescent current and <400 µA logic supply quiescent current - critical for battery-powered imaging modules.

Key Specifications

Pinout & Package

The MC34933EPR2 is housed in a 16-pin UQFN (Ultra Thin Quad Flat No-lead) package with an exposed thermal pad (EP), measuring 3.0 mm × 3.0 mm × 0.55 mm. The EP must be soldered to a PCB ground plane using ≥4 thermal vias for effective heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual H-bridge motor driver applications.

Compared with TB6612FNG and DRV8833, the MC34933EPR2 uniquely combines hardware-enforced shoot-through protection, integrated charge pump for flexible VM/VCC ratios, and autonomous VCC/thermal fault responses - making it optimal for safety-critical, battery-sensitive optical actuation where firmware supervision is limited.

Availability

MC34933EPR2 is available at Aetrix Electronics and suitable for digital camera autofocus modules, optical image stabilization systems, and compact scanner motor drives requiring stable component supply across production lifecycles.

Supply support for MC34933EPR2 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

Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in analog, mixed-signal, and embedded processing solutions for automotive, industrial, and consumer electronics.

The MC34933EPR2 belongs to Freescale's analog motor driver product line, engineered specifically for low-voltage, low-power optical actuation in space-constrained imaging systems - emphasizing integration, protection, and battery efficiency.

FAQ

What is the maximum continuous output current per channel for the MC34933EPR2?

The MC34933EPR2 supports 1.0 A maximum continuous DC load current per channel at TA = 25 °C, and 0.7 A at TA = 85 °C. Its 1.4 A peak rating applies to short-duration pulses (10 ms at 200 ms intervals), enabling burst-mode operation for lens acceleration without thermal saturation. This rating is validated under the specified thermal layout with exposed pad properly connected.

Does the MC34933EPR2 require external components for high-side gate drive?

Yes - the MC34933EPR2 requires two external 0.1 µF ceramic capacitors connected between CH and CL pins to enable its integrated charge pump. This pump generates VG = VM + VCC, allowing full enhancement of high-side MOSFETs even when VM exceeds VCC (e.g., 5.0 V motor supply with 3.0 V logic). No external diodes or bootstrap capacitors are needed.

How does the MC34933EPR2 handle undervoltage and overtemperature conditions?

The MC34933EPR2 autonomously disables its H-bridge drivers under two fault conditions: (1) VCC drops below 2.2 V (typical), triggering tri-state mode to prevent logic corruption; and (2) junction temperature exceeds 170 °C (typical), halting output switching until temperature falls by ~20 °C hysteresis. Both protections are hardware-based and require no MCU intervention.

Can the MC34933EPR2 drive a unipolar stepper motor?

No - the MC34933EPR2 is designed exclusively for bipolar stepper and brushed DC motors. Its dual full-H-bridge architecture provides bidirectional current control per winding, which is incompatible with unipolar stepper configurations requiring center-tapped coils and single-ended drivers. Using it with unipolar motors would result in incorrect phase excitation and potential damage.

What is the purpose of the exposed pad on the MC34933EPR2 UQFN package?

The exposed pad on the MC34933EPR2 serves as the primary thermal dissipation path, directly connected to the die substrate. It must be soldered to a PCB ground plane using at least four thermal vias to achieve the specified R_θJC of 23 °C/W. While electrically tied to ground, its main function is thermal - not signal integrity - and insufficient thermal design will cause premature thermal shutdown during sustained 1.0 A operation.