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Monolithic Power Systems Inc. MP3430HQ-Z
- Part No.:
- MP3430HQ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
MP3430HQ-Z.pdf
- Description:
- IC REG BOOST ADJ 600MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,004
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Product details
Overview
MP3430HQ-Z from Monolithic Power Systems is a monolithic 90V step-up converter with integrated high-side avalanche photodiode (APD) current monitoring, featuring 1.3MHz fixed-frequency current-mode control, 0.9A internal N-FET switch, and dual precision APD monitor outputs (1:10 and 1:2 ratios). It delivers stable bias voltage for optical receivers in fiber-optic network equipment.
For engineers reviewing the MP3430HQ-Z datasheet, MP3430HQ-Z pinout, MP3430HQ-Z application, or MP3430HQ-Z equivalent, key selection criteria include APD current-limit programmability via RLIM, ±5% APD monitor tolerance, 50ns fast-response current sensing, thermal shutdown at 160°C, and QFN16 (3×3mm) package compatibility with high-voltage optical front-ends.
Technical Context
The MP3430HQ-Z implements a constant-frequency, current-mode boost architecture with internal compensation and soft-start, enabling fast transient response and cycle-by-cycle current limiting. Its PWM comparator compares ramp-modulated switch current against feedback-derived error voltage to regulate output up to 90V.
It integrates a dedicated high-side APD current mirror with two buffered outputs (MON1 and MON2), each with defined gain ratios (0.10 mA/mA and 0.50 mA/mA), clamped output voltage (2.2–3.5V), and sub-50ns delay for optical power transient detection. APD over-current protection is resistor-programmable via RLIM with linear threshold scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion or 3.3V/5V system rails without external LDO pre-regulation. |
| Max Output Voltage | 90V - sufficient for biasing high-gain APDs in long-haul fiber-optic receivers and LiDAR modules. |
| Switching Frequency | 1.3MHz (typ.) - enables compact magnetics (e.g., 2.2µH inductors) and reduces EMI filtering burden. |
| APD Monitor Response | 50ns (tdelay1) - captures rapid optical transients without missing critical APD saturation events. |
| Feedback Reference | 0.8V (typ.) - allows precise VOUT programming using standard resistor dividers with <0.12%/V line regulation. |
| Thermal Shutdown | 160°C with 10°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| APD Current Limit Range | 0.36–4.3mA (programmable via RLIM) - covers typical APD operating currents while avoiding optical damage. |
Pinout & Package
MP3430HQ-Z is housed in a thermally enhanced 3mm × 3mm QFN-16 package with exposed thermal pad (EP), optimized for high-voltage DC-DC conversion and low-noise APD biasing. The package supports ≤60°C/W junction-to-ambient thermal resistance on a 4-layer PCB per JESD51-7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 PGND | Power Ground | Internally connected ground pins; must both be soldered to large PCB ground plane for low-impedance return path and thermal dissipation. |
| 2 VIN | Input Supply | 2.7–5.5V input rail; requires local 10µF ceramic bypass capacitor to prevent UVLO false triggering during startup. |
| 3 EN | Enable Control | Logic-level shutdown pin (0.6V max disable, 1.6V min enable); 100kΩ–10nF RC filter recommended for clean turn-on sequencing. |
| 5 FB | Feedback Input | Connects to resistor divider tap; regulates output by comparing 0.8V internal reference - sets VOUT = 0.8V × (1 + RTOP/RBOTTOM). |
| 7 MON2 | APD Current Monitor Output #2 | Sources 50% of APD current (IAPD × 0.5); converts to voltage across RMON2 for analog monitoring or ADC interface. |
| 8 AGND | Analog Ground | Separate analog reference node; must be tied to PGND at single point near IC to minimize noise coupling into MON1/MON2 paths. |
| 9 RLIM | APD Current-Limit Programming | Resistor-to-ground sets APD over-current threshold (e.g., 27.2kΩ → 2.5mA limit); linear scaling enables fine-grained optical safety tuning. |
| 10 MON1 | APD Current Monitor Output #1 | Sources 10% of APD current (IAPD × 0.1); provides high-resolution, low-noise signal for closed-loop APD bias control. |
| 12 APD | APD Cathode Connection | High-voltage output node (up to 90V); connects directly to APD cathode - requires proper creepage/clearance layout per IEC 60950. |
| 13 MONIN | APD Monitor Power Supply | Supplies bias to internal APD current mirror; requires external RC low-pass filter to reject switching noise from SW node. |
| 14, 15 SW | Power Switch Node | Drains internal 100V/0.9A N-FET; trace must be short and wide to minimize EMI and ringing from 90V flyback transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-ratio APD current monitoring | 1:10 (MON1) and 1:2 (MON2) mirrored outputs enable simultaneous high-resolution control and robust fault detection. |
| Programmable APD over-current protection | RLIM pin accepts 13.7kΩ–137kΩ resistors to set APD current limit from 0.36mA to 4.3mA - matches diverse APD sensitivity requirements. |
| 50ns APD current response time | Enables real-time detection of optical surge events before APD damage occurs - critical for burst-mode PON receivers. |
| Integrated soft-start and compensation | Eliminates need for external compensation components or startup timing circuits - reduces BOM count and layout complexity. |
| High-side APD monitor with ±5% tolerance | Ensures accurate optical power measurement across temperature (-40°C to +125°C), supporting closed-loop bias stability in uncooled modules. |
Applications
| APD Biasing in Fiber-Optic Receivers | PIN Diode Biasing for Optical Transceivers |
|---|---|
|
Use Scenario: Providing stable, adjustable high-voltage bias to avalanche photodiodes in GPON/XPON optical line terminals (OLTs) and optical network units (ONUs). IC Role / Device Role / Timing Role: Step-up converter + APD current monitor - generates 40–90V bias while continuously measuring photocurrent for automatic gain control (AGC). Use Value: Enables >30dB dynamic range in optical receivers without external op-amps or discrete current-sense resistors, reducing component count and board area. |
Use Scenario: Supplying reverse-bias voltage to PIN diodes in SFP+/QSFP+ optical transceiver modules used in data center switches and routers. IC Role / Device Role / Timing Role: High-efficiency boost regulator - delivers regulated 24–36V bias with low ripple (<0.1%) to maintain consistent PIN diode capacitance and insertion loss. Use Value: Achieves >85% efficiency at 2.5mA load, minimizing thermal stress in space-constrained pluggable modules and extending module lifetime. |
| LiDAR Receiver Front-Ends | Fiber-Optic Network Test Equipment |
|
Use Scenario: Biasing APDs in time-of-flight (ToF) LiDAR receivers for autonomous vehicles and industrial sensing, where fast optical pulse detection is essential. IC Role / Device Role / Timing Role: Fast-response APD bias generator - delivers 70–90V bias with 50ns current-monitor latency to capture nanosecond-scale laser return pulses. Use Value: Supports sub-nanosecond timing resolution by eliminating external current-sense delays, improving distance measurement accuracy by >1cm at 100m range. |
Use Scenario: Powering optical receiver calibration circuits in bit-error-rate testers (BERTs) and optical spectrum analyzers requiring precise, drift-free APD bias. IC Role / Device Role / Timing Role: Precision high-voltage source - maintains <±0.5% output voltage drift over temperature and line, enabling repeatable optical power measurements. Use Value: Reduces calibration uncertainty by eliminating external DAC-based bias sources, cutting test setup time and improving measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar APD biasing and high-voltage boost applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX32700ETL+ | Higher 120V output capability but no integrated APD monitor; requires external current-sense amplifier and protection circuitry. | Lacks MON1/MON2 outputs - unsuitable for closed-loop APD bias control without added components and layout area. | Select when absolute max output voltage >90V is required and APD monitoring is handled externally. |
| TSM1081IR | Lower 60V max output; includes only single-ratio (1:1) APD monitor; slower 200ns response time. | Insufficient for 90V APDs in long-reach fiber systems; limited dynamic range due to lack of dual-ratio monitoring. | Choose only for cost-sensitive, short-reach applications where 60V bias and basic monitoring suffice. |
Compared with MAX32700ETL+ and TSM1081IR, MP3430HQ-Z uniquely combines 90V output, dual-ratio APD monitoring, and 50ns response in one QFN16 package - delivering full optical front-end functionality without compromise on integration, speed, or voltage range.
Availability
MP3430HQ-Z is available at Aetrix Electronics and suitable for fiber-optic network equipment, LiDAR receiver modules, and optical test instrumentation requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.
Supply support for MP3430HQ-Z 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 analog and power ICs, with core expertise in DC-DC conversion, motor drivers, and optical power management.
The MP3430 product line is designed specifically for high-voltage optical receiver biasing, integrating step-up conversion and precision APD current monitoring to simplify front-end design in fiber-optic and LiDAR systems.
FAQ
What is the maximum allowable APD voltage applied to the APD pin?
The APD pin supports voltages up to 90V under normal operation, with an absolute maximum rating of 100V. Exceeding 90V risks violating the device's specified operating conditions and may trigger overvoltage protection or reduce reliability. Layout must observe ≥0.5mm creepage from APD to adjacent low-voltage pins per IPC-2221B Class B.
How does the RLIM resistor determine the APD current limit threshold?
The RLIM pin voltage linearly scales the APD current limit: IAPD,MAX (mA) ≈ –122 × VRLIM + 48. VRLIM is set by connecting RLIM to GND; for example, 27.2kΩ yields ~2.5mA limit at 40V MONIN. RLIM values between 13.7kΩ and 137kΩ cover the full 0.36–4.3mA range.
Can MON1 and MON2 be used simultaneously without interference?
Yes - MON1 and MON2 operate independently with separate current mirrors and output clamps (2.2–3.5V). They share only the MONIN supply rail, so proper decoupling (e.g., 100nF ceramic + 10µF tantalum) on MONIN is required to prevent crosstalk during fast APD current transients.
Is the MP3430HQ-Z compatible with discontinuous conduction mode (DCM) only?
Yes - the MP3430HQ-Z is explicitly designed for DCM operation due to its high conversion ratio (e.g., 3.3V→90V). Operating in CCM risks instability from right-half-plane zero; design guidelines mandate K < KCRIT, verified via inductor selection (e.g., ≤2.2µH for 50V output) and minimum load constraints.
What is the purpose of the MONIN pin, and how should it be decoupled?
MONIN supplies bias to the internal APD current mirror circuitry. It must be filtered with a low-pass RC network (e.g., 10Ω + 100nF) referenced to AGND to suppress switching noise from the SW node, ensuring <±5% monitor accuracy. Direct connection to VOUT or SW causes significant gain error and response delay.
Does the MP3430HQ-Z require external compensation components?
No - the MP3430HQ-Z features fully internal compensation optimized for its current-mode control loop. No external capacitors or resistors are needed on the COMP or FB pins. This eliminates tuning effort and improves production consistency across varying input/output conditions.
How is thermal performance affected by the exposed pad (EP) connection?
The exposed pad is electrically connected to PGND and serves as the primary thermal path. Soldering EP to ≥4cm² of inner-layer copper pour (with ≥4 thermal vias) reduces θJA from 60°C/W to ≤45°C/W, allowing full 0.9A switch current at +85°C ambient without thermal shutdown.
MP3430HQ-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 90V
- Current - Output:
- 600mA (Switch)
- Frequency - Switching:
- 1.3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
MP3430HQ-Z FAQ
1.How can I place an order for MP3430HQ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3430HQ-Z 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 MP3430HQ-Z reliable?
The price and inventory of MP3430HQ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3430HQ-Z is usually 5 days.
3.What payment methods are accepted for MP3430HQ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3430HQ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3430HQ-Z?
MP3430HQ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3430HQ-Z 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 MP3430HQ-Z?
For technical support, including MP3430HQ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3430HQ-Z requirements.
6.How does Aetrix verify that MP3430HQ-Z is sourced from the original manufacturer or authorized distributors?
All MP3430HQ-Z 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 MP3430HQ-Z meets industry standards.
7.What is the process for return or replacement of MP3430HQ-Z?
All MP3430HQ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3430HQ-Z, 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 MP3430HQ-Z part is unused and in its original packaging.
Return procedure for MP3430HQ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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