Monolithic Power Systems Inc. MP4865AGBD-T

Overview

MP4865AGBD-T from Monolithic Power Systems is a 64-channel, high-voltage SPST analog switch with integrated output bleed resistors, designed for medical ultrasound beamforming and NDT transducer multiplexing. It supports ±90V analog signal switching, 14Ω typical on-resistance, ±1.8A peak current per channel, and operates from dual low-voltage supplies (3.3V/5V logic + 5V translator). Its serial shift register control enables compact I/O footprint in high-density PZT arrays.

For engineers reviewing the MP4865AGBD-T datasheet, MP4865AGBD-T pinout, MP4865AGBD-T application, or MP4865AGBD-T equivalent, this device delivers verified high-voltage analog routing without external HV supplies - critical for ultrasound transmit/receive (T/R) switching, timing-critical echo signal integrity, and cascaded multi-chip channel expansion via DOUT.

Technical Context

The MP4865AGBD-T implements a two-stage digital control architecture: a 64-bit serial shift register followed by a parallel 64-bit latch, synchronized by a 60MHz max clock and edge-triggered LE\ enable. Each channel's SWINx/SWOUTx pair routes ±90V signals with 2.0µs turn-on/turn-off times and -66dB off-isolation at 5MHz.

Its patented level-shifting architecture eliminates dedicated ±HV supplies by translating 5V logic to drive high-voltage switches directly. Integrated 20–50kΩ output bleed resistors suppress residual charge on SWOUTx nodes between pulses, reducing acoustic ring-down and improving near-field image resolution in ultrasound systems.

Key Specifications

Pinout & Package

BGA-144 (10mm × 10mm) package with 0.8mm pitch, MSL Level 3, suitable for high-reliability medical PCB assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage analog switching applications.

Compared with TMUX136 and ADG1414, MP4865AGBD-T uniquely combines 64-channel density, ±90V capability, integrated bleed, and serial control - delivering a complete, supply-free T/R switching solution for medical and NDT ultrasound systems where channel count, voltage, and timing precision are non-negotiable.

Availability

MP4865AGBD-T is available at Aetrix Electronics and suitable for medical ultrasound imaging systems, non-destructive testing equipment, and portable transceiver modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP4865AGBD-T 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 and analog ICs, with core expertise in high-efficiency DC/DC conversion and high-voltage analog integration.

The MP4865A belongs to MPS's high-voltage analog switch product line, engineered specifically for medical ultrasound and NDT applications where eliminating external HV supplies, minimizing acoustic artifacts, and enabling dense channel counts are primary design objectives.

FAQ

What is the maximum allowable analog signal voltage for MP4865AGBD-T?

The MP4865AGBD-T supports analog signals from 0V to ±90V under recommended operating conditions. Absolute maximum ratings allow ±105V transient exposure, but sustained operation above ±90V risks reliability degradation and is not guaranteed per datasheet specifications.

Does MP4865AGBD-T require external high-voltage supplies?

No. The device uses only two low-voltage supplies: VLL (2.7–5.5V) for logic and VDD (4.5–5.5V) for internal level shifting. Its patented architecture generates necessary gate drive voltages internally, eliminating all external ±HV rails, bypass capacitors, and associated safety certifications.

How does the integrated output bleed resistor improve ultrasound image quality?

The 20–50kΩ bleed resistor on each SWOUTx pin actively discharges residual transducer capacitance after transmit pulses, reducing mechanical ring-down. This shortens the dead zone, improves near-field resolution, and enhances contrast in B-mode and Doppler imaging - confirmed in clinical ultrasound reference designs.

Can multiple MP4865AGBD-T devices be cascaded? How many?

Yes - the DOUT pin allows daisy-chaining. With a 60MHz clock and 64-bit shift register, full configuration of one device takes ≤1.07µs. Practical cascading supports ≥16 devices in series while maintaining sub-20µs total update time, sufficient for real-time beam steering in commercial ultrasound platforms.

What is the thermal performance of MP4865AGBD-T in continuous operation?

In a 4-layer PCB per JESD51-9, θJA is 21°C/W. At maximum junction temperature (125°C) and 25°C ambient, the device supports up to 4.8W continuous power dissipation. Under typical ultrasound burst duty cycles (<1%), thermal load remains well below this limit, enabling reliable operation without forced cooling.

Is MP4865AGBD-T compatible with 3.3V logic interfaces?

Yes. VLL accepts 2.7–5.5V, so 3.3V logic levels are fully supported. Input thresholds scale with VLL (VIH = 0.8×VLL, VIL = 0.2×VLL), ensuring robust noise margins. However, VDD must remain at 4.5–5.5V to guarantee proper level-shifter operation and ±90V switching performance.

What package variant is MP4865AGBD-T?

MP4865AGBD-T is the tray-packaged version of the MP4865AGBD, which uses a BGA-144 (10mm × 10mm, 0.8mm pitch) package. The "-T" suffix denotes tape-and-reel alternative; both share identical die, pinout, and electrical characteristics.