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Monolithic Power Systems Inc. MP9842GL-P
- Part No.:
- MP9842GL-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-PowerVQFN
- Datasheet:
-
MP9842GL-P.pdf
- Description:
- IC REG BUCK ADJ 2A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:887
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Product details
Overview
MP9842GL-P from Monolithic Power Systems is a 36V, 2A synchronous step-down DC/DC converter with integrated 125mΩ high-side and 55mΩ low-side MOSFETs, programmable 350kHz–2.5MHz switching frequency, 14μA no-load quiescent current, and power-good (PG) output - designed for automotive and battery-powered systems requiring high efficiency across wide input voltage (3.3V–36V) and light-to-full load conditions.
For engineers reviewing the MP9842GL-P datasheet, MP9842GL-P pinout, MP9842GL-P application, or MP9842GL-P equivalent, this device supports pre-bias start-up, selectable forced CCM/AAM modes, 80ns minimum on-time, hiccup OCP, and BST refresh for high-duty-cycle operation - critical for ECU power rails, industrial sensors, and portable instrumentation where thermal management and supply stability are essential.
Technical Context
The MP9842GL-P employs peak-current-mode control with internal error amplifier and optimized compensation network, enabling fast transient response and stable loop behavior without external compensation components. Its PLL-based oscillator supports precise frequency synchronization and phase alignment across multiple units via SYNC/PHASE pins.
It integrates dual regulation paths: VCC powered from VIN (with internal 2.6V regulator) or externally via BIAS pin (5V–18V), reducing dissipation and improving efficiency at high VIN; BST charging uses dedicated refresh circuitry to sustain >95% duty cycle operation by actively monitoring and restoring BST–SW voltage above 2.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports direct connection to automotive battery (cold-crank down to 3.3V) and industrial 24V rails without pre-regulation. |
| Output Current | 2A continuous - delivers full rated current with thermal shutdown protection at ≤125°C junction temperature in QFN-16 package. |
| Quiescent Current | 14μA at no load - enables multi-week battery runtime in always-on IoT sensors and telematics modules. |
| Switching Frequency | 350kHz to 2.5MHz - programmable via FREQ resistor or external SYNC clock; allows EMI optimization and compact magnetics selection. |
| Feedback Reference | 0.800V ±2% - precision reference enables accurate output regulation (±1%) with standard 1% resistors in feedback divider. |
| Power Good Threshold | ±10% of VOUT - open-drain PG asserts low when output deviates beyond tolerance, enabling system-level fault detection and sequencing. |
| Min On-Time | 80ns - supports high VIN-to-VOUT ratios (e.g., 24V→3.3V at ~14% duty cycle) without pulse-skipping instability. |
| Thermal Shutdown | 170°C with 20°C hysteresis - protects against sustained overload or poor PCB heatsinking while allowing automatic recovery. |
Pinout & Package
MP9842GL-P is housed in a thermally enhanced QFN-16 (3mm × 4mm) package with exposed thermal pad (PGND-connected), supporting ≥2.6W power dissipation at +25°C ambient per θJA = 48°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PHASE | Phase alignment control | Configures in-phase or 180° out-of-phase operation relative to SYNC clock - enables interleaved parallel operation to halve input ripple current. |
| 2 VIN | Main input supply | Supplies internal control circuitry and high-side switch; requires local 4.7µF ceramic decoupling to minimize switching noise injection. |
| 3,10 SW | Switch node | Drives external inductor; connects internally to both MOSFETs - must be routed with minimal loop area to reduce EMI and voltage spikes. |
| 4,9 PGND | Power ground | Reference for power stage; requires solid copper pour and multiple vias to thermal pad - separates high di/dt return path from analog ground. |
| 5 EN | Enable control | Digital enable with 0.9–1.2V threshold; pulls chip into 2µA shutdown state when low - supports microcontroller-controlled power sequencing. |
| 6 SYNC | Frequency sync & mode select | Accepts 350kHz–2.5MHz logic-level clock; high level at startup forces CCM, low/floating enables AAM for light-load efficiency optimization. |
| 7 PG | Power good indicator | Open-drain output pulled low when VOUT deviates >±10%; requires external pull-up to system rail for fault signaling or reset generation. |
| 8 BIAS | External bias supply | Accepts 5V–18V external source to power internal regulators - reduces VIN dissipation and improves efficiency at high input voltages. |
| 11 BST | Bootstrap supply | Charges via internal regulator from SW node; requires 0.1–1µF ceramic capacitor between BST and SW for high-side gate drive integrity. |
| 12 VCC | Internal bias rail | Stabilized ~5V supply for gate drivers and logic; requires ≥1µF local decoupling - sourced from VIN or BIAS depending on configuration. |
| 13 AGND | Analog ground | Reference for FB, SS, and error amplifier - must be isolated from PGND except at single-point connection to avoid noise coupling into feedback path. |
| 14 SS | Soft-start timing | Internal 10µA current source charges external capacitor; sets ramp time for VOUT to prevent inrush and overshoot during startup. |
| 15 FB | Feedback input | Senses output voltage via resistor divider; 0.800V reference enables precise regulation - trace routing must avoid noise sources and vias. |
| 16 FREQ | Frequency programming | Resistor-to-ground sets oscillator frequency (e.g., 82kΩ → ~1MHz); enables deterministic EMI placement and layout-driven frequency selection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 14μA no-load IQ enables >1-year battery life in always-on automotive body controllers and wireless sensor nodes. |
| Integrated dual MOSFETs | 125mΩ HS + 55mΩ LS switches eliminate external FETs and drivers - reduces BOM count and PCB area by >30% vs discrete solutions. |
| Selectable conduction mode | SYNC pin configures forced CCM (low ripple, fixed frequency) or AAM (high efficiency at light load) - adapts dynamically to system load profile. |
| BST refresh for high duty cycle | Active BST–SW voltage monitoring sustains >95% duty cycle operation - supports 24V→3.3V conversion without dropout under full load. |
| Hiccup over-current protection | Auto-retry shutdown on short-circuit limits average power dissipation and prevents thermal runaway during sustained faults. |
| Pre-bias start-up support | Allows safe startup into pre-charged output capacitors - essential for hot-swap and power-rail sequencing in multi-rail systems. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Transmitter |
|---|---|
|
Use Scenario: Powers microcontroller, CAN transceiver, and LIN interface in door module with 12V battery input subject to cold-crank (down to 3.3V) and load-dump transients. IC Role / Device Role / Timing Role: Primary 3.3V/2A power rail regulator with PG monitoring for system reset assertion and fault logging. Use Value: 14μA IQ extends sleep-mode battery life; 36V max rating withstands ISO 7637-2 pulse 5a; PG signal triggers MCU watchdog reset on undervoltage. |
Use Scenario: Supplies 5V/2A to 4–20mA transmitter IC, ADC, and isolation barrier in hazardous-area pressure sensor housing. IC Role / Device Role / Timing Role: Isolated secondary-side buck regulator fed from flyback output; operates continuously in harsh ambient (-40°C to +85°C). Use Value: AAM mode maintains >85% efficiency at 10mA load; thermal shutdown prevents field failure in sealed enclosures; SYNC enables EMI spread-spectrum alignment. |
| Portable Medical Instrumentation | Telematics Control Unit (TCU) |
|
Use Scenario: Powers ARM Cortex-M7 SoC and display driver in handheld ultrasound probe operating from rechargeable Li-ion (3.0–4.2V) and 24V vehicle adapter. IC Role / Device Role / Timing Role: Dual-input buck converter accepting either battery or vehicle supply; manages seamless switchover and brownout recovery. Use Value: Wide 3.3–36V input eliminates need for separate boost/buck stages; 80ns min on-time supports 24V→5V conversion; SS pin enables controlled power-up sequence. |
Use Scenario: Generates 1.2V core and 3.3V I/O rails for LTE modem, GNSS receiver, and eSIM controller in fleet-tracking unit mounted in vehicle cabin. IC Role / Device Role / Timing Role: Secondary-stage point-of-load regulator downstream of primary 5V supply; synchronized to system clock to suppress conducted EMI. Use Value: SYNC/PHASE pins allow interleaving with other MP9842GL-P units to reduce input capacitor RMS current by 30%; PG confirms rail stability before modem initialization. |
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-A-Z | Same 36V/2A rating but 20μA IQ, fixed 500kHz frequency, no SYNC/PHASE or BIAS pin - lacks frequency flexibility and ultra-low-IQ advantage. | Best suited for cost-sensitive, non-EMI-critical industrial supplies where fixed frequency simplifies layout. | Select MP9842GL-P when programmable frequency, <15μA IQ, or multi-unit synchronization is required. |
| LM61480RQR | TI part with 36V/8A rating, 15μA IQ, and spread-spectrum option - larger current capability but higher BOM cost and footprint (QFN-16 vs MP9842's smaller thermal pad). | Preferred for high-current applications like ADAS camera modules where 2A is insufficient. | Choose MP9842GL-P for space-constrained 2A designs needing minimal external components and lowest standby power. |
Compared with MPQ4420AGL-A-Z, MP9842GL-P delivers 30% lower no-load IQ and full frequency programmability; versus LM61480RQR, it offers identical IQ with smaller footprint and lower gate-drive complexity - making it optimal for compact, battery-sensitive automotive and portable systems.
Availability
MP9842GL-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor transmitters, portable medical instrumentation, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MP9842GL-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 MP9842 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for robust operation in 12V/24V automotive environments and battery-powered equipment demanding ultra-low quiescent current and high reliability.
FAQ
What is the maximum allowable input voltage for MP9842GL-P?
The absolute maximum input voltage is 40V, but the recommended operating range is 3.3V to 36V. Operation above 36V risks exceeding internal MOSFET breakdown limits and may trigger overvoltage protection. Sustained exposure to 40V is not advised - use transient clamping if load-dump events exceed 36V.
Can MP9842GL-P operate with an input voltage below 3.3V?
No - the under-voltage lockout (UVLO) rising threshold is 2.4V to 3.2V, and the device will not start or regulate below ~3.3V. For sub-3.3V inputs, consider the MP9486A (1.8V–18V) or MPQ4423 (2.5V–36V), which support lower VIN start-up.
How does the BIAS pin improve efficiency?
When BIAS is supplied with 5V–18V, the internal regulators draw power from BIAS instead of VIN, reducing power loss in the VIN-to-VCC LDO path. At VIN = 24V, this lowers total dissipation by ~180mW and raises full-load efficiency by up to 1.2 percentage points.
Is the MP9842GL-P pin-compatible with other MP98xx variants?
Yes - MP9842GL-P shares identical QFN-16 (3mm×4mm) pinout and footprint with MP9841 and MP9843, differing only in current rating (1.5A/2A/3A) and internal MOSFET RDS(on). Layout reuse is possible, but verify thermal performance and current-limit thresholds for each variant.
What happens during pre-bias start-up?
If FB voltage exceeds SS – 150mV at startup, the IC inhibits both HS- and LS-FET switching until SS rises above FB. This prevents reverse current flow into a pre-charged output capacitor - protecting downstream loads and avoiding uncontrolled inrush.
Does MP9842GL-P support output voltage tracking?
Yes - the SS pin accepts external voltage ramp signals, enabling precise power-rail sequencing with other converters. Tie SS to another converter's PG or SS output via resistor divider to coordinate ramp rates and ensure proper turn-on order in multi-rail systems.
How is thermal performance affected by PCB layout?
Thermal resistance drops from θJA = 48°C/W (4-layer board, 2oz Cu) to ≤32°C/W with full thermal pad soldering, 6+ vias to inner ground planes, and 200mm² copper pour. Poor layout (e.g., missing vias or small pad) can raise junction temperature by >25°C at 2A load.
MP9842GL-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x4)
MP9842GL-P FAQ
1.How can I place an order for MP9842GL-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP9842GL-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 MP9842GL-P reliable?
The price and inventory of MP9842GL-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP9842GL-P is usually 5 days.
3.What payment methods are accepted for MP9842GL-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9842GL-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP9842GL-P?
MP9842GL-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP9842GL-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 MP9842GL-P?
For technical support, including MP9842GL-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9842GL-P requirements.
6.How does Aetrix verify that MP9842GL-P is sourced from the original manufacturer or authorized distributors?
All MP9842GL-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 MP9842GL-P meets industry standards.
7.What is the process for return or replacement of MP9842GL-P?
All MP9842GL-P units undergo pre-shipment inspection (PSI). If there is an issue with MP9842GL-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 MP9842GL-P part is unused and in its original packaging.
Return procedure for MP9842GL-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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