Renesas M56788AFP#D32J

Overview

M56788AFP#D32J from Mitsubishi Electric (formerly Mitsubishi Semiconductors) is a 5-channel actuator driver IC designed for optical disc drive servo systems. It integrates five independent H-bridge output stages with built-in operational amplifiers, dual mute control (MUTE1 for CH1–CH4, MUTE2 for CH5), thermal shutdown, and bootstrap-enabled low-saturation operation. Typical saturation voltage is 1.35 V at 0.5 A load without bootstrap, dropping further with VBS1/VBS2 ≥ Vm + 1.0 V. It supports CD/DVD/Blu-ray focus, tracking, spindle, sled, and loading actuator control.

For engineers reviewing the M56788AFP#D32J datasheet, M56788AFP#D32J pinout, M56788AFP#D32J application, or M56788AFP#D32J equivalent, key selection considerations include dual motor supply separation (Vm1 for CH1–CH2, Vm2 for CH3–CH5), ±0.5 mV input offset voltage per channel, 5×/8× programmable gain via external resistor networks, and thermal shutdown activation at 155 °C.

Technical Context

The M56788AFP#D32J implements five fully differential input amplifier stages (E1–E5) driving high-current H-bridge outputs, each with independently configurable gain (×5 for CH1/CH2, ×8 for CH3–CH5). Input offset voltage is tightly controlled at ±0.5 mV across all channels under recommended operating conditions (VBS = Vm = 5 V).

It features two isolated bootstrap supplies (VBS1 for CH1–CH2, VBS2 for CH3–CH5), enabling extended output swing beyond Vm rails and reducing saturation voltage. Thermal protection activates at 155 °C (non-guaranteed trip point), and dual mute logic disables power/control circuits selectively: MUTE1 (Pin 26) controls CH1–CH4, MUTE2 (Pin 25) controls CH5.

Key Specifications

Pinout & Package

Package: 42-pin POWER-SSOP (42P9R-K), thermally enhanced surface-mount package with exposed thermal pad (GND-connected pins 3, 8, 17, 18, 19, 20, 42).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5-channel optical actuator driver applications.

Compared with BA5954FP-E2 and TC78H653FTG, the M56788AFP#D32J uniquely integrates five matched analog servo channels with dual mute, bootstrap support, and CH3IN flexibility - making it the only direct solution for legacy and mid-tier optical drive platforms requiring full analog servo integration in one package.

Availability

M56788AFP#D32J is available at Aetrix Electronics and suitable for optical disc drive manufacturing, servo subsystem repair, and industrial CD/DVD/BD player refurbishment requiring stable component supply and long-term lifecycle support.

Supply support for M56788AFP#D32J 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

Mitsubishi Electric Corporation is a global leader in power semiconductors, industrial automation, and optical storage components, with decades of expertise in precision analog ICs for consumer and industrial applications.

The M56788AFP#D32J belongs to Mitsubishi's optical actuator driver product line, engineered specifically for high-accuracy, low-noise servo control in CD, DVD, and Blu-ray disc drives - emphasizing thermal robustness, channel isolation, and analog signal fidelity.

FAQ

What is the maximum allowable load current per channel for the M56788AFP#D32J?

The absolute maximum rating for load current per channel (CH1–CH5) is 500 mA, as specified in the Absolute Maximum Ratings table. This value applies under continuous DC conditions with proper thermal management - e.g., using a 2-layer PCB (A-type board) supporting up to 4.5 W dissipation. Exceeding 500 mA risks thermal shutdown activation or permanent damage.

Does the M56788AFP#D32J support PWM input control?

Yes, the M56788AFP#D32J supports PWM input control via its flexible input amplifier architecture. Each channel (E1–E5) accepts differential or single-ended inputs, and the internal op-amps are optimized for fast settling with PWM duty-cycle modulation. Application Circuit No. 2 explicitly demonstrates differential PWM input for focus, tracking, and spindle control.

How does the bootstrap function reduce saturation voltage in the M56788AFP#D32J?

The M56788AFP#D32J uses two independent bootstrap supplies (VBS1 for CH1–CH2, VBS2 for CH3–CH5). When VBS* is set ≥ Vm* + 1.0 V, the PNP emitter in the output stage is driven higher, reducing base-emitter voltage drop and lowering saturation voltage - e.g., from 1.35 V (no bootstrap) to <1.0 V. This directly decreases power loss and junction temperature during full-swing actuator operation.

What is the purpose of the CH3IN pin on the M56788AFP#D32J?

The CH3IN pin provides a dedicated single-ended input for Channel 3, distinct from the differential IN3+/IN3− pair. It enables simplified connection to spindle or sled control signals that originate from single-ended DACs or comparator outputs. Internally, CH3IN feeds the E3 amplifier with ×8 gain - matching the higher gain requirement of spindle motors versus focus/tracking coils.

Can the M56788AFP#D32J operate with only one motor supply voltage?

No - the M56788AFP#D32J requires two separate motor supply domains: Vm1 (pins VM1+/VM1−) for CH1–CH2, and Vm2 (pins VM2+/VM2−, VM3+/VM3−, etc.) for CH3–CH5. This separation is hardwired in the internal power routing and cannot be bypassed. Using a single supply violates the pin function specification and may cause malfunction or damage.