MP7745DF-LF-Z - 2x20W Class-D Stereo Amplifier | MPS
MPN: MP7745DF-LF-Z ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MP7745DF-LF-Z Overview
A Class-D audio amplifier is a switching power amplifier that uses PWM-related transistor operation to deliver audio energy efficiently compared with a conventional linear amplifier. The MP7745 belongs to the hierarchy Class-D amplifier → audio amplifier → analog power amplifier → power-management semiconductor. This category is especially useful for portable speakers, compact consumer audio equipment, and other systems where speaker output power and board area are important.
Key features include 2 × 20 W stereo output, a 9.5 V to 26 V supply range, integrated 250 mΩ power MOSFETs, single-ended outputs, short-circuit protection, and startup/shutdown pop elimination. The MP7745 is intended for surface-mount designs using its exposed-pad TSSOP package. The verified distributor listing describes the MP7745DF-LF-Z as a lead-free, RoHS-compliant amplifier in a 20-TSSOPF-EP package.
The MP7745’s integrated output stage simplifies the power layout, but the exposed pad still requires careful thermal design. The LC output-filter network is critical because Class-D outputs contain high-frequency switching energy. Inductor selection, capacitor placement, speaker wiring, and return-current paths should follow the manufacturer’s recommended application circuit. The evaluation board EV7745DF-01A provides a manufacturer-supported reference for evaluating the MP7745 in a stereo speaker amplifier design.
Typical uses include portable Bluetooth speakers, compact stereo speakers, multimedia speaker systems, small audio consoles, and consumer products requiring two amplified speaker channels. The 2 × 20 W capability makes the part appropriate for low-impedance speakers when the supply and thermal limits are respected. Compared with a discrete Class-D design, integrated MOSFETs can reduce component count and simplify assembly, although thermal performance still depends on PCB copper area, load impedance, output waveform, and ambient temperature.
For a new design, use the MP7745DF-LF-Z when a compact, integrated stereo Class-D solution is preferred over a discrete output stage. Verify the exact pinout, recommended LC filter, input coupling, supply decoupling, and exposed-pad land pattern against the manufacturer datasheet. This page combines the verified specifications, source links, application guidance, and drop-in comparison framework needed for engineering evaluation.
Drop-in alternatives for MP7745DF-LF-Z — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MP7745DF-LF-Z (same form factor and footprint) — differing in Integrated Power MOSFET Resistance, Lead-Free Status, Operating Temperature, Output Power, Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MP7745DF-LF
✅ Drop-In📋 Reference alternative (not in catalog)
MP7745DF-Z
✅ Drop-In📋 Reference alternative (not in catalog)
MP7745DF-LF-P
✅ Drop-In📋 Reference alternative (not in catalog)
MP7742DF-LF-Z
✅ Drop-In✓ In Stock
$0.97 / Unit
View Datasheet →MP7722DF-LF-Z
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MP7745DF-LF-Z Maximum Ratings & Electrical Characteristics
| Product Type | Stereo Class-D audio amplifier IC |
| Number of Channels | 2 channels |
| Output Configuration | Single-ended stereo |
| Output Power | 20 W per channel into 4 Ω |
| Supply Voltage Range | 9.5 V to 26 V |
| Integrated Power MOSFET Resistance | 250 mΩ |
| Protection | Short-circuit protection |
| Startup Feature | Startup pop elimination |
| Shutdown Feature | Shutdown pop elimination |
| Operating Temperature | -40 °C to +85 °C |
| Maximum Power Dissipation | 3.1 W |
| Package | 20-pin TSSOPF-EP |
| Package Outline | TSSOP, MO-153ACT |
| Mounting Type | Surface mount |
| RoHS Compliance | RoHS compliant |
| Lead-Free Status | Lead free |
| Evaluation Board | EV7745DF-01A |
MP7745DF-LF-Z tssop, mo-153act Pin Configuration Guide
Pin configuration for MP7745DF-LF-Z (tssop, mo-153act package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for MP7745DF-LF-Z.
Refer to the datasheet for full pin configuration.
Typical Applications
MP7745DF-LF-Z is suitable for 6 applications: Portable Bluetooth Speaker, Compact Stereo Speaker, Multimedia Speaker System, Consumer Audio Console, USB Audio Speaker, Industrial Audio Notification Unit.
Portable Bluetooth Speaker
The MP7745DF-LF-Z fits a compact stereo Bluetooth speaker that needs 20 W per channel into 4 Ω speakers. Its integrated 250 mΩ MOSFETs reduce the number of external output-power components, while startup and shutdown pop elimination helps control audible transitions. The designer should place the input, supply, and output-filter components according to the manufacturer application circuit, preserve the exposed-pad thermal connection, and verify battery or adapter voltage across the 9.5 V to 26 V supply range.
Recommended
Compact Stereo Speaker
The MP7745DF-LF-Z provides two amplified channels for compact stereo speaker systems where each channel targets 20 W into 4 Ω. Its single-ended Class-D output architecture can simplify system integration compared with a discrete MOSFET output stage. The key engineering constraint is the LC output filter: its inductance and capacitance must be selected according to the manufacturer’s switching-frequency and load recommendations. Thermal performance should be validated with the actual speaker enclosure, because copper area and ambient temperature affect the exposed-pad junction temperature.
Recommended
Multimedia Speaker System
The MP7745DF-LF-Z is suitable for a multimedia speaker system requiring independent left and right amplified outputs from a regulated supply. Its 2 × 20 W stereo specification allows a compact implementation for desktop or home-theater accessories, while short-circuit protection adds resilience in consumer audio equipment. The system designer should keep analog input routing away from switching-node and output-filter currents, provide local supply decoupling, and use the EV7745DF-01A evaluation board as a reference for startup, shutdown, filtering, and exposed-pad layout.
Recommended
Consumer Audio Console
The MP7745DF-LF-Z can serve as the stereo speaker driver in a small consumer audio console, provided the supply and speaker impedance match its verified 9.5 V to 26 V and 4 Ω operating targets. The integrated output MOSFETs reduce assembly count, and the pop-elimination functions improve mute and power-control behavior. Designers should avoid placing high-current speaker returns near sensitive audio inputs, verify filter stability across the full audio band, and calculate thermal margin using the worst-case continuous-output condition rather than only the nominal 20 W rating.
Recommended
USB Audio Speaker
The MP7745DF-LF-Z is appropriate for a USB audio speaker when a digital audio source is followed by a stereo DAC or codec and a low-impedance speaker load. The amplifier’s two-channel output supports conventional left/right routing, while its short-circuit protection helps protect the output stage during cable or load faults. Power-supply design should prevent switching ripple from entering the audio input path, and the output LC filter must be placed according to the MP7745 reference layout to limit radio-frequency and EMI radiation.
Recommended
Industrial Audio Notification Unit
The MP7745DF-LF-Z can be used in industrial audio notification equipment when two speaker channels, short-circuit protection, and a compact surface-mount implementation are useful. Its -40 °C to +85 °C operating range covers many industrial environments, but the final design must verify enclosure temperature, supply tolerance, and speaker impedance under worst-case conditions. A robust implementation should include input protection, controlled shutdown sequencing, filter layout that limits EMI, and sufficient exposed-pad copper to keep junction temperature below the manufacturer’s limits.
Recommended
Recommended Products Summary
Engineering reference data for MP7745DF-LF-Z — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MP7745DF-LF | MP7745DF-Z | MP7745DF-LF-P | MP7742DF-LF-Z | MP7722DF-LF-Z |
|---|---|---|---|---|---|---|
| Package | 20-pin TSSOPF-EP | 20-pin TSSOPF-EP | 20-pin TSSOPF-EP | 20-pin TSSOPF-EP | 20-pin TSSOPF-EP | 20-pin TSSOPF-EP |
| Brand | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems | Monolithic Power Systems |
| Channel Count | 2 | 2 | 2 | 2 | 2 | 2 |
Key Differentiators
- Integrated 250 mΩ power MOSFET output stage (vs MP7722DF-LF-Z)
- Startup and shutdown pop elimination (vs MP7742DF-LF-Z)
- Single-ended stereo Class-D architecture (vs MP7742DF-LF-Z)
Design Notes
Use the manufacturer’s exposed-pad land pattern and connect the thermal pad to the ground plane with the recommended copper and via arrangement. The verified package is TSSOPF-EP rather than a generic TSSOP, so the pad geometry and paste design must be matched. Keep the exposed-pad thermal path free of accidental plane splits and validate the board with the actual amplifier enclosure and speaker-load conditions.
Place local input and output decoupling close to the relevant MP7745 pins, and route high-current supply and speaker-return paths so switching current does not share sensitive audio input traces. The verified supply range is 9.5 V to 26 V; confirm regulator tolerance, startup current, and load transients. A supply that is quiet at idle can still introduce audible or RF interference if its dynamic impedance is inadequate.
Do not treat MP7722DF-LF-Z, MP7742DF-LF-Z, or a generic Class-D amplifier as a drop-in replacement without comparing pin functions and electrical limits. The verified search identifies related MPS parts and comparison pages, but it does not establish complete pin compatibility. Confirm output topology, supply range, gain, filter requirements, exposed-pad geometry, and thermal limits against both manufacturer datasheets before changing a PCB.
Class-D switching outputs require careful LC filtering and layout. Keep the switching node compact, route speaker outputs away from analog inputs, and use the manufacturer’s recommended output-filter values and placement. An incorrectly selected filter can increase audible distortion, EMI radiation, or speaker resonances even when the amplifier’s 20 W output rating is satisfied. Evaluate the finished assembly with the speaker cable and enclosure attached.
Compliance Information
The verified distributor data identifies MP7745DF-LF-Z as RoHS compliant and lead free. No verified information was supplied for REACH, halogen-free status, conflict-minerals compliance, or AEC-Q100 qualification.
