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Monolithic Power Systems Inc. MPQ9842GL-P
- Part No.:
- MPQ9842GL-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-PowerVQFN
- Datasheet:
-
MPQ9842GL-P.pdf
- Description:
- IC REG BUCK ADJ 2A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:940
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Product details
Overview
MPQ9842GL-P from Monolithic Power Systems is a 36V, 2A, AEC-Q100 Grade-1 qualified synchronous step-down DC/DC converter with integrated 125mΩ high-side and 55mΩ low-side MOSFETs, 14μA no-load quiescent current, and programmable 350kHz–2.5MHz switching frequency. It delivers stable output in automotive infotainment power rails and ADAS camera modules requiring wide-input, low-IQ, and EMI-compliant operation.
For engineers reviewing the MPQ9842GL-P datasheet, MPQ9842GL-P pinout, MPQ9842GL-P application, or MPQ9842GL-P equivalent, this page provides verified technical context on peak-current-mode control, AAM/CCM mode selection via SYNC, BST refresh for high-duty-cycle operation, PG signal timing, and QFN-16 (3mm×4mm) thermal layout requirements.
Technical Context
The MPQ9842GL-P uses peak-current-mode control with internal error amplifier and 0.8V reference to regulate output voltage, enabling fast transient response and simplified loop compensation. Its PLL-based oscillator supports precise frequency synchronization and phase alignment (in-phase or 180° out-of-phase) via PHASE pin.
It implements dual operating modes: Advanced Asynchronous Mode (AAM) for ultra-high light-load efficiency (14μA IQ) and forced Continuous Conduction Mode (CCM) for fixed-frequency ripple control. BST refresh circuitry sustains >95% duty cycle by actively refreshing the bootstrap capacitor during low-VBST conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - Supports full automotive battery range including cold-crank (4.5V) and load-dump (36V) transients. |
| Output Current | 2A continuous - Delivers full rated current without derating at TA ≤ 85°C on standard 4-layer PCB. |
| Quiescent Current | 14μA at no load - Enables >1-year battery standby in always-on vehicle modules (e.g., telematics, door controllers). |
| Switching Frequency | 350kHz–2.5MHz programmable - Allows EMI optimization and small external component selection (e.g., 4.7μH inductor @ 500kHz). |
| Feedback Reference | 0.800V ±1.5% - Enables precise output regulation across temperature; supports adjustable (via FB divider) or fixed 3.3V/5V variants. |
| Power Good Threshold | ±10% window (85–95% rising / 79–89% falling) - Provides reliable system power sequencing with 30μs deglitch timing. |
| Thermal Shutdown | 170°C with 20°C hysteresis - Protects against sustained overload while allowing brief peak-power operation in burst-mode applications. |
Pinout & Package
MPQ9842GL-P is housed in a thermally enhanced QFN-16 package (3mm × 4mm, 0.5mm pitch) with wettable flank option (GL-P suffix), supporting automated optical inspection (AOI) and improving solder joint reliability in automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PHASE | Synchronization phase selector | Configures internal clock phase alignment (0° or 180°) relative to external SYNC; tie to GND if unused. |
| 2 VIN | Main input supply | Accepts 3.3–36V; requires local 10μF ceramic decoupling to PGND for EMI suppression and voltage stability. |
| 3,10 SW | Switch node | High dv/dt node connecting internal HS/LS FETs; must be routed with minimal loop area to reduce radiated emissions. |
| 4,9 PGND | Power ground return | Primary return path for high-current switching; requires dedicated copper pour and multiple vias to inner ground plane. |
| 5 EN | Enable control | Digital logic input (0.9–1.2V threshold); pull low for <2μA shutdown; must not float to prevent erratic startup. |
| 6 SYNC | Frequency sync & mode select | Accepts 350kHz–2.5MHz external clock; low at startup enables AAM, high enables forced CCM. |
| 7 PG | Open-drain power good | Asserts when VOUT is within ±10% of target; requires external pull-up (e.g., to 3.3V) for system monitoring. |
| 8 BIAS | Efficiency-boosting bias rail | Accepts 5–18V external supply to reduce internal regulator loss; improves full-load efficiency by ~1.2% at 12VIN/5VOUT. |
| 11 BST | Bootstrap supply | Charges via internal regulator; requires 0.1–1μF ceramic capacitor to SW for high-side gate drive integrity. |
| 12 VCC | Internal bias supply | 5V regulated output powering control logic; requires ≥1μF local decoupling to AGND. |
| 13 AGND | Analog ground reference | Separate low-noise ground for FB, SS, and error amplifier; must connect to PGND at single point near VCC capacitor. |
| 14 SS | Soft-start timing | 10μA current source charges external capacitor; sets inrush current ramp time; internal 0.7ms minimum ensures safe startup. |
| 15 FB | Voltage feedback input | 0.8V reference comparator input; for adjustable version, connects to resistor divider; for fixed versions, tied directly to VOUT. |
| 16 FREQ | Frequency programming | Resistor-to-ground sets fSW: 180kΩ = 475kHz, 82kΩ = 1MHz, 27kΩ = 2.5MHz (per Equation 1 in datasheet). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade-1 qualification | Validated for -40°C to +125°C junction operation - meets automotive power supply reliability requirements for engine bay and cabin applications. |
| 80ns minimum on-time | Enables high step-down ratios (e.g., 24V→3.3V @ 2MHz) without pulse-skipping artifacts or instability. |
| Hiccup-mode over-current protection | Shuts down and auto-retries on sustained overload - prevents thermal runaway while maintaining system-level fault containment. |
| Low-dropout BST refresh | Maintains high-side gate drive at >95% duty cycle by forcing LS-FET conduction to recharge BST capacitor - critical for 24V→5V/3.3V automotive rails. |
| CISPR 25 Class 5 compliant EMI performance | Passes conducted/radiated emissions limits up to 1GHz with recommended filter layout - eliminates need for external EMI filters in most automotive designs. |
Applications
| Automotive Infotainment Display Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powers LCD backlight drivers and SoC core rails in head-unit displays exposed to 12V battery fluctuations and thermal cycling. IC Role / Device Role / Timing Role: Primary buck converter delivering 3.3V/5V at 2A with tight line/load regulation (<±0.5%) and fast transient recovery (<10μs). Use Value: AEC-Q100 qualification and 14μA IQ ensure compliance with OEM sleep-mode current budgets and long-term field reliability. |
Use Scenario: Supplies image sensor and ISP in rear-view or surround-view cameras operating in under-hood or exterior mounting locations. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with 36V input tolerance and thermal shutdown protecting against reverse-battery and load-dump events. Use Value: 80ns min on-time and BST refresh enable stable 5V output from 24V input even at 90%+ duty cycle-critical for compact camera PCBs with limited heatsinking. |
| Industrial Telematics Gateway | Commercial Vehicle Telematics Unit |
|
Use Scenario: Powers LTE modem, GNSS receiver, and microcontroller in fleet management gateways installed in truck cabins with wide ambient temperature swings. IC Role / Device Role / Timing Role: Input-stage DC/DC converting 9–36V vehicle bus to stable 5V/3.3V rails with PG signaling for safe MCU boot sequencing. Use Value: PG output with 30μs deglitch ensures clean power-good assertion before firmware initialization, preventing brown-out resets. |
Use Scenario: Supplies CAN transceivers, microcontroller, and memory in J1939-compliant telematics units subject to ISO 7637-2 pulse 5a/b (load dump). IC Role / Device Role / Timing Role: Robust front-end regulator with 40V absolute max input rating and hiccup OCP to survive repeated load-dump transients. Use Value: Integrated 125mΩ/55mΩ MOSFETs eliminate external FET layout complexity and reduce BOM count versus discrete controller solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4420AGL-AEC1 | Lower 2.5A rating, 4.5–36V input, fixed 500kHz fSW, no SYNC/PHASE pins | Lacks frequency synchronization and phase control; suited for cost-sensitive, non-EMI-critical modules | Select when design does not require EMI tuning or multi-phase coordination, and 2.5A output suffices. |
| TPS543B20RHLT | 36V, 3A, PMBus interface, 400kHz–2.2MHz fSW, higher 25μA IQ | Includes digital telemetry and margining; larger 4mm×4mm QFN package with higher θJA | Choose when system-level power monitoring, dynamic voltage scaling, or tighter output accuracy (±0.5%) is required. |
Compared with MPQ4420AGL-AEC1, MPQ9842GL-P offers superior light-load efficiency and EMI flexibility; versus TPS543B20RHLT, it trades digital control for lower quiescent current and smaller footprint-ideal for space-constrained automotive modules where analog simplicity and ultra-low IQ dominate.
Availability
MPQ9842GL-P is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and industrial telematics gateways requiring stable component supply with AEC-Q100 traceability and extended temperature support.
Supply support for MPQ9842GL-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MPQ9842 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for harsh-environment vehicle subsystems demanding AEC-Q100 reliability, low quiescent current, and robust EMI performance without external filtering.
FAQ
What is the maximum allowable input voltage for MPQ9842GL-P?
The absolute maximum input voltage is 40V, but the recommended operating range is 3.3V to 36V per datasheet specifications. Operation above 36V risks exceeding safe operating area during load-dump transients unless external clamping (e.g., TVS) is implemented per ISO 7637-2 Pulse 5a.
Can MPQ9842GL-P operate with a 24V input and 3.3V output at 2A?
Yes. With a 4.7μH inductor and 500kHz switching frequency, the MPQ9842GL-P achieves >92% efficiency at 24VIN/3.3VOUT/2A. Its 80ns minimum on-time and BST refresh ensure stable regulation even at ~14% duty cycle without pulse skipping or dropout.
How does the SYNC pin affect efficiency and noise performance?
When SYNC is pulled low at startup, MPQ9842GL-P enters Advanced Asynchronous Mode (AAM), reducing IQ to 14μA and minimizing switching losses at light loads. When pulled high, it forces Continuous Conduction Mode (CCM), fixing fSW for predictable EMI spectrum and lower output ripple-but with reduced light-load efficiency.
Is external compensation required for the MPQ9842GL-P control loop?
No. The MPQ9842GL-P features an optimized internal compensation network designed for standard 4.7μH–10μH inductors and 22μF–47μF output capacitors. External compensation is unnecessary unless using non-standard LC values or requiring custom transient response shaping.
What is the purpose of the BIAS pin, and when should it be used?
The BIAS pin accepts an external 5–18V supply to power internal circuitry, bypassing the VIN-regulated VCC rail. Use it when VIN exceeds 12V to reduce power dissipation in the internal regulator-improving full-load efficiency by up to 1.2% and lowering die temperature in thermally constrained layouts.
Does MPQ9842GL-P support output voltages other than 3.3V and 5V?
Yes-the MPQ9842GL-P is the adjustable-output variant. By connecting a resistor divider between VOUT and AGND with the center tap to FB, any output from 0.8V to VIN × 95% can be set. Fixed 3.3V and 5V versions exist (MPQ9842GLE-33-AEC1, MPQ9842GLE-5-AEC1) but use different FB configurations.
How is thermal performance validated for MPQ9842GL-P in automotive applications?
MPS characterizes thermal resistance on a 4-layer JEDEC-standard board (θJA = 43°C/W) and on its EVB (θJA = 43°C/W, θJC = 5°C/W). At 2A/12VIN/5VOUT, junction temperature rise is <45°C above ambient-well below the 125°C max rating, confirming suitability for under-dash and cabin-mounted automotive modules.
MPQ9842GL-P 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:
- 2A
- 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)
MPQ9842GL-P FAQ
1.How can I place an order for MPQ9842GL-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ9842GL-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 MPQ9842GL-P reliable?
The price and inventory of MPQ9842GL-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ9842GL-P is usually 5 days.
3.What payment methods are accepted for MPQ9842GL-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ9842GL-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ9842GL-P?
MPQ9842GL-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ9842GL-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 MPQ9842GL-P?
For technical support, including MPQ9842GL-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ9842GL-P requirements.
6.How does Aetrix verify that MPQ9842GL-P is sourced from the original manufacturer or authorized distributors?
All MPQ9842GL-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 MPQ9842GL-P meets industry standards.
7.What is the process for return or replacement of MPQ9842GL-P?
All MPQ9842GL-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ9842GL-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 MPQ9842GL-P part is unused and in its original packaging.
Return procedure for MPQ9842GL-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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