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Monolithic Power Systems Inc. MPQ9843GL-Z
- Part No.:
- MPQ9843GL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-PowerVQFN
- Datasheet:
-
MPQ9843GL-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:19,952
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Product details
Overview
MPQ9843GL-Z from Monolithic Power Systems is a 36V, 3A synchronous step-down converter with AEC-Q100 Grade-1 qualification, 14μA no-load quiescent current, and programmable 350kHz–2.5MHz switching frequency. It integrates 125mΩ high-side and 55mΩ low-side MOSFETs, delivers power-good signaling, and operates across automotive battery input ranges (3.3V–36V) in engine control units and ADAS camera modules.
For engineers reviewing the MPQ9843GL-Z datasheet, MPQ9843GL-Z pinout, MPQ9843GL-Z application, or MPQ9843GL-Z equivalent, key selection criteria include its ultra-low IQ for battery longevity, AEC-Q100 compliance for automotive deployment, hiccup-mode OCP for robust fault handling, and QFN-16 (3mm×4mm) wettable flank package for automated optical inspection.
Technical Context
The MPQ9843GL-Z uses peak-current-mode control with internal compensation, enabling fast transient response and stable loop behavior without external components. Its dual-mode operation-selectable forced CCM for noise-sensitive applications or AAM for light-load efficiency-supports dynamic load profiles in automotive infotainment and telematics.
It features integrated bootstrap refresh, 80ns minimum on-time for high-duty-cycle operation (e.g., 5V-out from 6V-in), and precision 0.8V feedback reference with ±1% tolerance over –40°C to +125°C. The PG output asserts when VOUT reaches 85–95% of nominal, with 30µs deglitching for reliable system sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports cold-crank (3.3V) and load-dump (36V) transients in automotive 12V systems. |
| Output Current | 3A continuous - sustains full load at TJ ≤ 125°C with standard PCB layout and 2oz copper. |
| Quiescent Current | 14μA at no load - enables >1-year battery standby in always-on vehicle modules without drain. |
| Switching Frequency | 350kHz to 2.5MHz - adjustable via FREQ pin resistor; allows EMI optimization and compact magnetics. |
| Feedback Reference | 0.800V ±1% - ensures accurate output regulation across temperature and line/load variations. |
| Power Good Threshold | 85–95% of VREF rising / 79–89% falling - provides clean, glitch-free rail monitoring for MCU reset sequencing. |
| Thermal Shutdown | 170°C with 20°C hysteresis - protects against sustained overload while permitting brief peak-power bursts. |
Pinout & Package
MPQ9843GL-Z is housed in a thermally enhanced QFN-16 (3mm × 4mm) package with wettable flanks for solder joint inspection. Exposed thermal pad (Pin 4/9 PGND) must be connected to ≥4 thermal vias to internal ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PHASE | Synchronization phase select | Configures SYNC input alignment: high = in-phase, low = 180° out-of-phase; tie to GND if unused. |
| 2 VIN | Main input supply | Accepts 3.3V–36V; requires local 10μF ceramic decoupling to PGND for EMI suppression. |
| 3,10 SW | Switch node | High-frequency AC node connecting internal HS/LS FETs; minimal trace area reduces radiated emissions. |
| 4,9 PGND | Power ground | Low-impedance return path for power switches; must be isolated from AGND except at single-point star ground. |
| 5 EN | Enable control | Active-high logic input (0.9–1.2V threshold); supports controlled power-up/down with external microcontroller. |
| 6 SYNC | Frequency sync & mode select | Accepts 350kHz–2.5MHz clock; also selects AAM (low) or forced CCM (high) before startup. |
| 7 PG | Open-drain power good | Signals VOUT stability; requires external pull-up (e.g., 100kΩ to 3.3V) for MCU reset coordination. |
| 8 BIAS | Bias supply input | Optional 5–18V auxiliary supply to reduce VCC regulator losses and improve full-load efficiency. |
| 11 BST | Bootstrap capacitor connection | Connect 0.1μF X7R ceramic between BST and SW to drive high-side FET gate reliably. |
| 12 VCC | Internal bias regulator output | Supplies gate drivers and logic; requires ≥1μF ceramic bypass to AGND near pin. |
| 13 AGND | Analog ground reference | Reference for FB, SS, and error amplifier; connect to PGND only at single point under IC body. |
| 14 SS | External soft-start | Capacitor-to-GND sets ramp time; 10μA current source enables precise inrush control (e.g., 100nF = 10ms). |
| 15 FB | Feedback input | 0.8V reference node; for adjustable version, use resistor divider; fixed-output variants tie directly to VOUT. |
| 16 FREQ | Frequency programming | Resistor-to-GND sets fSW: 180kΩ = ~475kHz, 82kΩ = ~1MHz, 27kΩ = ~2.5MHz. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade-1 qualified | Rated for –40°C to +125°C junction operation - validated for under-hood automotive environments. |
| Hiccup-mode over-current protection | Shuts down and auto-retries on short-circuit - prevents thermal runaway while preserving system availability. |
| 80ns minimum on-time | Enables 90%+ duty cycle (e.g., 32V→3.3V conversion) without pulse-skipping instability. |
| Wettable flank QFN-16 package | Facilitates automated AOI of solder joints - critical for zero-defect automotive manufacturing. |
| EMI-optimized design | Meets CISPR 25 Class 5 conducted/radiated limits with standard filter - reduces board-level filtering cost. |
Applications
| Engine Control Unit (ECU) | ADAS Camera Module |
|---|---|
|
Use Scenario: Powers 3.3V microcontroller, CAN transceiver, and sensor interface in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Primary 12V-to-3.3V buck regulator with cold-crank support and load-dump immunity. Use Value: Maintains regulation during 3.3V battery dips and 36V surges, ensuring uninterrupted ECU operation per ISO 7637-2. |
Use Scenario: Supplies 5V to image sensor and 1.2V to ISP in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Dual-rail power source with independent soft-start sequencing for sensor initialization. Use Value: 14μA IQ extends parking-mode battery life; AAM mode minimizes heat generation in sealed enclosures. |
| Automotive Infotainment Head Unit | Telematics Control Unit (TCU) |
|
Use Scenario: Generates 1.1V core voltage for ARM-based SoC and 3.3V for display interface in center-stack displays. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter feeding downstream LDOs and DC-DCs. Use Value: Programmable 2.2MHz switching avoids AM radio band; low EMI simplifies EMC validation. |
Use Scenario: Provides 3.3V to cellular modem, GNSS receiver, and secure element in vehicle connectivity modules. IC Role / Device Role / Timing Role: Always-on power rail with power-good signaling for safe firmware updates and OTA recovery. Use Value: PG output synchronizes modem reset with VOUT stabilization, preventing UART lockup during boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4433GQ-AEC1-P | 4A rating, 40V max VIN, 25μA IQ, fixed 2.2MHz fSW | Better suited for higher-current infotainment SoCs; lacks frequency programming and AAM mode | Select when output current >3A is required and fixed-frequency operation suffices. |
| TPS543B20RTWR | 3A, 18V max VIN, 15μA IQ, PMBus interface, 400kHz–2.2MHz fSW | Requires external MOSFETs; supports digital telemetry but not AEC-Q100 qualified | Choose for non-automotive industrial systems needing real-time telemetry and flexible topology. |
Compared with MPQ4433GQ-AEC1-P and TPS543B20RTWR, the MPQ9843GL-Z uniquely balances AEC-Q100 compliance, ultra-low IQ, and analog programmability - making it optimal for cost-sensitive, safety-critical 3A automotive rails where digital control adds unnecessary complexity.
Availability
MPQ9843GL-Z is available at Aetrix Electronics and suitable for automotive ECU, ADAS camera module, and telematics control unit designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for MPQ9843GL-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 global R&D centers and ISO/TS 16949-certified quality systems.
The MPQ9843 belongs to MPS's automotive-grade DC-DC converter product line, engineered specifically for harsh-temperature, high-reliability vehicle subsystems including powertrain, chassis, and driver-assistance electronics.
FAQ
What is the maximum allowable input voltage for MPQ9843GL-Z?
The absolute maximum input voltage is 40V, but the recommended operating range is 3.3V to 36V. Operation above 36V risks violating the 40V absolute limit during load-dump transients unless external clamping is implemented per ISO 7637-2 Pulse 5a.
Does MPQ9843GL-Z require an external bootstrap capacitor?
Yes - a 0.1μF X7R ceramic capacitor must be placed between BST and SW pins. This capacitor supplies gate-drive energy for the high-side MOSFET and must be located within 2mm of the pins to ensure reliable switching at 2.5MHz.
How is soft-start time configured on MPQ9843GL-Z?
Soft-start is set by an external capacitor on the SS pin: tSS ≈ (CSS × 0.8V) / 10μA. For example, a 100nF capacitor yields ~8ms ramp time. Leaving SS floating defaults to 0.7ms internal soft-start.
Can MPQ9843GL-Z operate without the BIAS pin connected?
Yes - BIAS may be left floating or tied to PGND. However, connecting BIAS to a clean 5–18V supply reduces VCC regulator dissipation and improves full-load efficiency by up to 1.2% at 3A.
What is the purpose of the PHASE pin?
The PHASE pin selects synchronization phase relative to the external SYNC clock: logic high enables in-phase operation, low enables 180° out-of-phase. It is used to stagger multiple MPQ9843GL-Z devices and reduce input ripple current in multi-rail systems.
Is MPQ9843GL-Z compatible with lead-free reflow profiles?
Yes - the QFN-16 package is RoHS-compliant and rated for JEDEC J-STD-020D moisture sensitivity level 3. Standard lead-free reflow (peak 260°C, 20–40s above 217°C) is supported with proper pre-bake if exposed to ambient >60% RH for >168 hours.
How does the power-good (PG) signal behave during undervoltage conditions?
PG goes open-drain low when VFB falls below 79–89% of VREF (falling threshold). It remains low until VFB rises above 85–95% of VREF (rising threshold), with 30µs deglitching to reject noise-induced false triggers during brownouts.
MPQ9843GL-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MPQ
- Package/Case:
- 16-PowerVQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 3A
- Frequency - Switching:
- 350kHz ~ 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x4)
MPQ9843GL-Z FAQ
1.How can I place an order for MPQ9843GL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ9843GL-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 MPQ9843GL-Z reliable?
The price and inventory of MPQ9843GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ9843GL-Z is usually 5 days.
3.What payment methods are accepted for MPQ9843GL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ9843GL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ9843GL-Z?
MPQ9843GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ9843GL-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 MPQ9843GL-Z?
For technical support, including MPQ9843GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ9843GL-Z requirements.
6.How does Aetrix verify that MPQ9843GL-Z is sourced from the original manufacturer or authorized distributors?
All MPQ9843GL-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 MPQ9843GL-Z meets industry standards.
7.What is the process for return or replacement of MPQ9843GL-Z?
All MPQ9843GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ9843GL-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 MPQ9843GL-Z part is unused and in its original packaging.
Return procedure for MPQ9843GL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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