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Monolithic Power Systems Inc. MP8128GQ-P
- Part No.:
- MP8128GQ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Special Purpose Regulators
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
MP8128GQ-P.pdf
- Description:
- 1A LNB POWER REGULATOR WITH I2C
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MP8128GQ-P from Monolithic Power Systems is a 1A LNB voltage regulator with integrated I²C interface and DiSEqC 2.x support, designed for satellite receiver antenna port power and control. It delivers low-noise 13–18V output via a boost + tracking LDO architecture, supports 8–14V input, provides 22kHz tone generation/detection, and features configurable current limiting (up to 1.43A), OCP/SCP/OVP/OTP, and QFN-20 (3mm×3mm) packaging.
For engineers reviewing the MP8128GQ-P datasheet, MP8128GQ-P pinout, MP8128GQ-P application, or MP8128GQ-P equivalent, this device serves as a complete DiSEqC-compliant LNB power solution requiring no external tone generator, minimal passive count, and precise I²C-configurable voltage/current/tone settings for satellite set-top boxes, PC card receivers, and TV tuners.
Technical Context
The MP8128GQ-P integrates a 440kHz fixed-frequency boost converter followed by a tracking linear regulator that maintains VBOOST = VOUT + 1.1V, enabling low-noise output while rejecting switching ripple. Its DiSEqC 2.x compliance is implemented through dedicated TDI/TDO pins, internal tone generator (20–24kHz), and external tone injection capability via EXTM.
I²C control enables real-time configuration of output voltage (10.33V/12V/13V/15V/18V), current limit (via ILIMT resistor), tone source selection (internal/external), and fault reporting via IRQ. The device also includes dynamic overload protection with 50ms on-time and 1.8s off-time, plus soft-start via TCAP capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 14V - matches standard satellite receiver DC bus; UVLO at 7.15V prevents erratic startup under brownout. |
| Output Voltage Range | 10.33V to 18V - selectable via I²C VLINE bits; covers universal LNB requirements including universal (13/18V) and regional variants. |
| Max Output Current | 1.43A - configurable via ILIMT resistor (6.98kΩ); sufficient for dual-LNB or high-capacitance coaxial loads. |
| Tone Frequency | 20–24kHz - meets DiSEqC 2.x spec; internally generated or externally injected via EXTM pin with 50% ±10% duty cycle. |
| Switching Frequency | 440kHz - enables compact 10µH inductor use; reduces EMI vs lower-frequency boost stages. |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-off. |
| I²C Clock Max | 400kHz - compatible with standard Fast-mode I²C controllers; ADDR pin supports 4 unique addresses (0001000–0001011). |
Pinout & Package
MP8128GQ-P is housed in a thermally enhanced QFN-20 (3mm × 3mm) package with exposed PGND pad for optimal heat dissipation. Pin 1 is SW (boost switch node), and the exposed pad must be soldered to PGND with ≥4 thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Boost switch drain | Connects to inductor and rectifier diode; carries high di/dt switching current; requires tight layout and Kelvin return path. |
| 4 EN | Enable control input | Active-high logic; must be pulled high via resistor divider from VDD-floating EN causes undefined operation. |
| 5 SDA / 6 SCL | I²C bidirectional data/clock | Supports standard I²C protocol; open-drain outputs require external pull-ups; VIH = 1.2V min ensures compatibility with 1.8V/3.3V hosts. |
| 7 IRQ | Open-drain fault indicator | Pulls low on OCP/OVP events; allows system-level fault logging without polling; requires external pull-up. |
| 11 ILIMT | Current limit setting | Analog input; resistor-to-GND sets LDO current limit (475mA–1.43A); floating pin disables regulation. |
| 14 TDO / 15 TDI | Tone detection interface | TDI accepts AC-coupled 22kHz signal from LNB_OUT; TDO asserts low when tone detected-enables DiSEqC 2.x handshake verification. |
| 17 VOUT | LDO regulated output | Delivers low-noise power to LNB; rated for 40V max; backward leakage <1.3mA enables safe hot-swap into live coaxial lines. |
Key Features
| Feature | Design Value |
|---|---|
| DiSEqC 2.x compatibility | Full hardware support for tone detection (TDI/TDO), bidirectional communication, and pulse timing per EN 50494-2/EN 50607 standards. |
| Integrated I²C interface | Eliminates need for external microcontroller or GPIO-based configuration; supports voltage, current, tone, and fault status readback. |
| Tracking LDO architecture | VBOOST tracks VOUT + 1.1V, minimizing dropout loss and heat generation while maintaining >70% efficiency at 1A load. |
| Selectable 22kHz source | Internal generator (TEN=1, TCTRL=0) or external injection (TEN=1, TCTRL=1) enables flexible system-level tone management. |
| Dynamic overload protection | Auto-retry behavior (50ms ON / 1.8s OFF) sustains operation during transient LNB surges without latching off. |
Applications
| Satellite Set-Top Box LNB Power | PC Card Satellite Receiver |
|---|---|
|
Use Scenario: Powering single or dual LNBs in consumer-grade DVB-S/S2 set-top boxes with motorized dish control. IC Role / Device Role / Timing Role: Primary LNB supply IC delivering regulated 13/18V, generating DiSEqC 2.x tone, and reporting faults via IRQ to host MCU. Use Value: Reduces BOM count by integrating boost, LDO, tone generator, and I²C interface-eliminating discrete 22kHz oscillator and level-shifting components. |
Use Scenario: Compact satellite TV reception in laptop PCMCIA/ExpressCard form factor with space-constrained PCB layout. IC Role / Device Role / Timing Role: Single-chip LNB power and DiSEqC control solution operating from 12V laptop rail; handles hot-plug detection via TDI/TDO. Use Value: Enables full DiSEqC 2.x functionality in sub-25mm² footprint; QFN-20 package and minimal external parts meet portable device thermal and size constraints. |
| TV Integrated Satellite Tuner | Professional Satellite Monitoring System |
|
Use Scenario: Embedded satellite tuner modules in smart TVs requiring reliable LNB power with zero audible noise. IC Role / Device Role / Timing Role: Low-noise LDO output suppresses switching ripple; tracking architecture ensures stable VOUT under varying coax cable capacitance. Use Value: Achieves <20mVpp output ripple at 1A, preventing interference with sensitive RF front-end; soft-start via TCAP avoids inrush-induced audio pop. |
Use Scenario: Multi-LNB monitoring in broadcast headend or VSAT hub stations requiring remote diagnostics and configuration. IC Role / Device Role / Timing Role: I²C-configurable voltage/current/tone parameters enable centralized firmware control across dozens of LNB channels. Use Value: Real-time readback of VOUT, IOUT, and fault flags via I²C allows predictive maintenance; IRQ pin enables interrupt-driven fault logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LNB voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX21002ETJ+T | Single-stage buck-boost topology; no integrated tone generator; requires external 22kHz circuit; I²C interface only for voltage setting. | Lacks native DiSEqC 2.x tone detection (TDI/TDO) and dynamic overload recovery; suited for simpler DiSEqC 1.x systems. | Choose when DiSEqC 2.x handshake and tone detection are unnecessary and board space permits external tone circuitry. |
| LMX2594RHAR | RF synthesizer with integrated LNB bias tee driver-not a dedicated LNB regulator; no OCP/SCP/OVP; no DiSEqC support. | Designed for active antenna arrays with phase-coherent LO distribution-not for standalone LNB power delivery. | Not a functional replacement; only relevant in hybrid RF/LNB designs where synthesis and bias are co-integrated. |
Compared with MAX21002ETJ+T and LMX2594RHAR, MP8128GQ-P uniquely combines DiSEqC 2.x hardware compliance, integrated tone generation/detection, and robust protection in a single QFN package-making it the only drop-in solution for next-generation satellite receivers requiring full two-way DiSEqC protocol support.
Availability
MP8128GQ-P is available at Aetrix Electronics and suitable for satellite set-top box manufacturing, PC card satellite receiver production, and professional broadcast equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MP8128GQ-P 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 ICs, with over two decades of expertise in DC/DC conversion, motor drivers, and satellite power solutions.
The MP8128 product line targets satellite receiver subsystems, delivering integrated LNB power, DiSEqC control, and I²C configurability to replace multi-chip discrete implementations in cost- and space-sensitive consumer and professional applications.
FAQ
What is the maximum allowable VOUT rating for MP8128GQ-P?
The absolute maximum VOUT rating is +40V, as specified in the Absolute Maximum Ratings table. This allows safe operation during transient overvoltage events on the coaxial line, such as lightning-induced surges or hot-plug insertion into live satellite feeds, without damage to the internal LDO or protection circuits.
How does the ILIMT pin configure output current limit?
The ILIMT pin accepts a resistor to ground to set the LDO current limit: 6.98kΩ yields 1.43A, 14kΩ yields 650mA, and 19.1kΩ yields 475mA. The relationship is linear and monotonic; values between these resistors scale proportionally. Floating ILIMT disables regulation entirely.
Can MP8128GQ-P operate with an external 22kHz tone source?
Yes-when TEN = 1 and TCTRL = 1, the EXTM pin accepts an external 20–24kHz square wave (0.5–0.85Vpp). The internal tone generator is disabled, and the device passes the external signal to VOUT. This mode supports legacy tone sources or synchronized multi-channel systems.
What is the purpose of the TDI and TDO pins in DiSEqC 2.x operation?
TDI receives the 22kHz tone signal from the LNB_OUT line (AC-coupled), and TDO asserts low when tone is detected-enabling hardware-level confirmation of DiSEqC command receipt. This forms the physical layer handshake required for DiSEqC 2.x bidirectional communication and error recovery.
Does MP8128GQ-P support automatic soft-start, and how is it controlled?
Yes-soft-start is controlled by the TCAP pin: connecting a capacitor (e.g., 100nF) from TCAP to SGND sets the output voltage ramp time. The TCAP voltage serves as the feedback reference; larger capacitors increase rise time, reducing inrush current and avoiding coaxial line transients.
What I²C address options are available via the ADDR pin?
The ADDR pin supports four I²C addresses: 0001000 (ADDR grounded), 0001001 (ADDR via 27kΩ), 0001010 (ADDR via 47kΩ), and 0001011 (ADDR floating). Each configures a unique 7-bit address, enabling up to four MP8128GQ-P devices on the same I²C bus for multi-LNB systems.
Is MP8128GQ-P compatible with both DiSEqC 1.x and 2.x protocols?
Yes-hardware-level compatibility is confirmed in the datasheet. DiSEqC 1.x operation uses basic tone generation and voltage switching; DiSEqC 2.x adds TDI/TDO handshake, pulse timing, and bidirectional message framing-all supported natively without firmware modification.
MP8128GQ-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, LNB
- Voltage - Input:
- 14V
- Number of Outputs:
- 1
- Voltage - Output:
- 40V
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x3)
MP8128GQ-P FAQ
1.How can I place an order for MP8128GQ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8128GQ-P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MP8128GQ-P reliable?
The price and inventory of MP8128GQ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP8128GQ-P is usually 5 days.
3.What payment methods are accepted for MP8128GQ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8128GQ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8128GQ-P?
MP8128GQ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8128GQ-P order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MP8128GQ-P?
For technical support, including MP8128GQ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8128GQ-P requirements.
6.How does Aetrix verify that MP8128GQ-P is sourced from the original manufacturer or authorized distributors?
All MP8128GQ-P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP8128GQ-P meets industry standards.
7.What is the process for return or replacement of MP8128GQ-P?
All MP8128GQ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP8128GQ-P, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MP8128GQ-P part is unused and in its original packaging.
Return procedure for MP8128GQ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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