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Monolithic Power Systems Inc. MP9843GL-Z
- Part No.:
- MP9843GL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-PowerVQFN
- Datasheet:
-
MP9843GL-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,037
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Product details
Overview
MP9843GL-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 125mΩ high-side and 55mΩ low-side MOSFETs, delivering 3A continuous output current across a 3.3V–36V input range. It features programmable 350kHz–2.5MHz switching frequency, 14μA no-load quiescent current, and power-good (PG) monitoring - enabling use in automotive infotainment power rails and battery-powered industrial sensors.
For engineers reviewing the MP9843GL-Z datasheet, MP9843GL-Z pinout, MP9843GL-Z application, or MP9843GL-Z equivalent, key selection criteria include its ultra-low IQ for standby operation, BST refresh capability for high-duty-cycle dropout, hiccup-mode OCP, AAM/CCM mode selectability via SYNC, and QFN-16 (3mm×4mm) thermal performance with θJA = 48°C/W.
Technical Context
The MP9843GL-Z employs peak-current-mode control with internal compensation, enabling fast transient response and stable loop design without external type-II/type-III networks. Its error amplifier compares FB voltage to a precision 0.800V reference and drives VCOMP to regulate duty cycle.
It supports dual operating modes: forced continuous conduction mode (CCM) for fixed-frequency ripple control, and advanced asynchronous mode (AAM) for light-load efficiency optimization - entering power-save mode (PSM) below ~10mA load with <2μA shutdown current and 14μA no-load IQ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports wide automotive battery transients (cold crank, load dump) and industrial 24V systems. |
| Output Current | 3A continuous - sufficient for powering microcontrollers, CAN transceivers, and sensor signal chains. |
| Quiescent Current | 14μA at no load - enables >1-year battery life in always-on IoT nodes with LiSOCl₂ or coin cells. |
| Switching Frequency | 350kHz to 2.5MHz - adjustable via FREQ resistor or external SYNC clock; avoids AM radio band and enables compact magnetics. |
| Feedback Reference | 0.800V ±1.5% - high-accuracy reference enables ±1% output regulation with standard 1% resistors. |
| Power Good Threshold | ±10% window on VOUT - open-drain PG asserts low when output deviates beyond 90–110% of setpoint, enabling system sequencing. |
| Thermal Shutdown | 170°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-off. |
Pinout & Package
MP9843GL-Z is housed in a thermally enhanced QFN-16 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. The package supports ≥2.6W power dissipation at TA = +25°C and requires proper PCB copper pour and vias under the pad for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PHASE | Synchronization phase control | Selects in-phase or 180° out-of-phase operation when paralleling multiple MP9843s to reduce input ripple. |
| 2 VIN | Main power input | Supplies internal control circuitry and high-side switch; requires local 4.7–10µF ceramic decoupling. |
| 3,10 SW | Switch node | Drives external inductor; connects internally to both MOSFETs - must be routed with minimal loop area. |
| 4,9 PGND | Power ground return | Low-impedance return path for high di/dt currents; separate from AGND to avoid noise coupling. |
| 5 EN | Enable control | Digital input with 0.9–1.2V threshold; pulls chip into 2μA shutdown when low. |
| 6 SYNC | Frequency sync & mode select | Accepts 350kHz–2.5MHz clock; high at startup forces CCM, low enables AAM/PSM. |
| 7 PG | Open-drain power good | Asserts low when VOUT falls outside ±10%; requires external pull-up for system monitoring. |
| 8 BIAS | Efficiency-boosting bias supply | Accepts 5–18V external rail to reduce internal LDO loss and improve light-load efficiency. |
| 11 BST | Bootstrap supply | Charges via internal regulator from SW; requires 0.1µF ceramic capacitor to SW for HS gate drive. |
| 12 VCC | Internal bias rail | Regulated ~5V supply for logic and drivers; requires ≥1µF local decoupling to AGND. |
| 13 AGND | Analog ground reference | Reference for FB, SS, and error amplifier; must be connected to PGND at single point near IC. |
| 14 SS | Soft-start timing | Charged by internal 10µA current source; sets ramp time and enables pre-bias start-up. |
| 15 FB | Voltage feedback input | Compares divider output to 0.800V reference; trace must be short and free of vias to minimize noise. |
| 16 FREQ | Frequency programming | Resistor-to-ground sets oscillator frequency per RFREQ = 170kΩ / fSW(kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 125mΩ HS + 55mΩ LS MOSFETs eliminate external discrete switches and reduce BOM count and layout complexity. |
| Ultra-Low Quiescent Current | 14μA no-load IQ enables >10-year shelf life in battery-backed applications like smart meters and remote sensors. |
| BST Refresh Architecture | Enables >95% duty cycle operation by actively refreshing bootstrap charge during dropout, supporting 3.3V-out from 3.6V-in. |
| Hiccup-Mode Over-Current Protection | Shuts down and auto-restarts on short-circuit, preventing thermal runaway while maintaining fault visibility. |
| Programmable Minimum On-Time | 80ns minimum on-time allows stable 500kHz+ operation even at 12V-in/1.2V-out, supporting high step-down ratios. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powers display controller, audio codec, and USB hub in 12V vehicle head units with cold-crank immunity. IC Role / Device Role / Timing Role: Primary 3.3V/3A buck regulator with PG signaling for system boot sequencing and brownout detection. Use Value: 36V max input withstands load-dump transients; 14μA IQ extends backup battery runtime during ignition-off state. | Use Scenario: Supplies wireless sensor module (MCU + LoRa + analog front-end) in battery-operated factory condition monitors. IC Role / Device Role / Timing Role: Main system regulator operating in AAM/PSM to minimize average current draw during sleep cycles. Use Value: Achieves >92% efficiency at 100μA load due to PSM entry, extending 2xAA alkaline battery life to >5 years. |
| Medical Portable Diagnostic Device | Rail-Switching Industrial PLC I/O |
Use Scenario: Generates isolated 5V and 3.3V rails for ADC, op-amps, and BLE radio in handheld ultrasound probe. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter feeding downstream LDOs and isolated DC/DCs. Use Value: 350kHz–2.5MHz frequency tuning avoids EMI-sensitive bands near 1.5MHz imaging clocks. | Use Scenario: Provides 24V-to-5V conversion for digital I/O modules in programmable logic controllers with 24V field bus input. IC Role / Device Role / Timing Role: Input-stage buck converter with robust OCP and thermal shutdown for unattended industrial environments. Use Value: Hiccup OCP prevents latch-up during cable short events; QFN thermal pad ensures reliable operation at 70°C ambient. |
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 |
|---|---|---|---|
| LM61480RQWR | Higher 4.5A rating, 50μA IQ, fixed 2.1MHz frequency; no AAM/PSM or BST refresh. | Better for high-current, fixed-frequency designs where light-load efficiency is secondary. | Choose LM61480RQWR if output current >3.3A is required and thermal margin is constrained. |
| TPS543320RHLT | 3A rating, 15μA IQ, PMBus interface, 400kHz–2.2MHz sync; no hiccup OCP (latch-off only). | Suitable for digitally managed power systems requiring telemetry and dynamic voltage scaling. | Choose TPS543320RHLT when system-level telemetry, fault logging, or multi-rail coordination is needed. |
Compared with LM61480RQWR and TPS543320RHLT, MP9843GL-Z uniquely balances ultra-low IQ, BST refresh for high-duty-cycle operation, hiccup OCP, and AAM/CCM mode flexibility - making it optimal for cost-sensitive, battery-aware, and automotive-grade applications where reliability under transient stress is critical.
Availability
MP9843GL-Z is available at Aetrix Electronics and suitable for automotive infotainment power, industrial sensor node supply, and medical portable diagnostic device applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP9843GL-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP9843 belongs to MPS's automotive-qualified high-voltage buck converter product line, engineered for robust operation in 12V/24V vehicle electrical systems and battery-powered industrial equipment with stringent efficiency and thermal requirements.
FAQ
What is the minimum input voltage required for MP9843GL-Z to start up and regulate?
The MP9843GL-Z has a VIN under-voltage lockout (UVLO) rising threshold of 2.4V to 3.2V, with 150mV hysteresis. It begins startup when VIN exceeds the rising threshold (typically ~2.8V), and regulation is maintained down to 3.3V input for most output voltages - though dropout performance improves significantly when BIAS is externally supplied.
Can MP9843GL-Z operate with a 3.3V input to generate a 3.3V output?
No - the MP9843GL-Z is a step-down converter and cannot achieve unity-gain regulation. Its minimum dropout is governed by BST refresh capability and MOSFET RDS(on); for 3.3V output, practical minimum input is ~3.6V with BIAS supplied, or ~4.2V with BIAS floating, due to combined VFB, gate drive, and conduction losses.
How does the PHASE pin affect synchronization when using multiple MP9843GL-Z devices?
The PHASE pin configures relative switching alignment: pulling PHASE high synchronizes the device in-phase with the SYNC clock, while pulling it low shifts switching by 180°. When two MP9843GL-Z units share one SYNC signal but have opposite PHASE states, their input current ripples cancel, reducing RMS input capacitor stress and allowing smaller bulk capacitance.
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 the internal gate drivers and control circuitry, bypassing the internal VIN-regulated VCC LDO. This reduces power loss and improves efficiency - especially at high input voltages (>15V) or light loads - and lowers thermal stress. Leave BIAS floating or tie to GND if unused.
Does MP9843GL-Z support pre-bias start-up, and how is it enabled?
Yes - MP9843GL-Z supports pre-bias start-up. If the FB voltage exceeds (SS voltage −150mV) at startup, the IC delays switching until SS rises above FB, preventing reverse current flow into a pre-charged output. No external components are required; this behavior is inherent and automatic when the SS capacitor is properly sized.
What is the maximum achievable switching frequency with external SYNC, and what are the timing constraints?
The MP9843GL-Z accepts SYNC signals from 350kHz to 2.5MHz. For reliable synchronization, the external clock must exceed the RFREQ-set frequency by ≥250kHz. Pulse width must exceed 100ns to overcome pad parasitic capacitance, and logic levels must meet VSYNC_LOW ≤ 0.4V and VSYNC_HIGH ≥ 1.8V for clean edge detection.
MP9843GL-Z 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:
- 3A
- 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)
MP9843GL-Z FAQ
1.How can I place an order for MP9843GL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP9843GL-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 MP9843GL-Z reliable?
The price and inventory of MP9843GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP9843GL-Z is usually 5 days.
3.What payment methods are accepted for MP9843GL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9843GL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP9843GL-Z?
MP9843GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP9843GL-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 MP9843GL-Z?
For technical support, including MP9843GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9843GL-Z requirements.
6.How does Aetrix verify that MP9843GL-Z is sourced from the original manufacturer or authorized distributors?
All MP9843GL-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 MP9843GL-Z meets industry standards.
7.What is the process for return or replacement of MP9843GL-Z?
All MP9843GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP9843GL-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 MP9843GL-Z part is unused and in its original packaging.
Return procedure for MP9843GL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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