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Monolithic Power Systems Inc. MP9843GL-P
- Part No.:
- MP9843GL-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-PowerVQFN
- Datasheet:
-
MP9843GL-P.pdf
- Description:
- IC REG BUCK ADJ 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:475
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Product details
Overview
MP9843GL-P from Monolithic Power Systems is a 36V, 3A 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 load ranges.
For engineers reviewing the MP9843GL-P datasheet, MP9843GL-P pinout, MP9843GL-P application, or MP9843GL-P equivalent, key selection considerations include its AAM/CCM mode selectability via SYNC, 80ns minimum on-time for high-duty-cycle operation, BST refresh capability, pre-bias start-up support, and thermal shutdown with 20°C hysteresis.
Technical Context
The MP9843GL-P employs peak-current-mode control with internal error amplifier and 0.8V reference, enabling fast transient response and simplified loop compensation. Its dual-mode operation-selectable forced CCM or Advanced Asynchronous Mode (AAM)-dynamically optimizes efficiency: AAM enables power-save mode (PSM) at light loads, reducing IQ to 14μA, while CCM maintains fixed frequency and lower output ripple.
It integrates bootstrap charging with BST refresh logic to sustain >95% duty cycle operation; when BST–SW drops below 2.5V, the LS-FET is forced on to recharge the BST capacitor. The device supports external synchronization (350kHz–2.5MHz), phase alignment (via PHASE pin), and soft-start timing controlled by an internal 10μA current source charging an external capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports direct connection to automotive battery rails (cold-crank down to 3.3V) and industrial 24V systems. |
| Continuous Output Current | 3A - delivered with integrated MOSFETs; no external power switches required. |
| No-Load Quiescent Current | 14μA - enables multi-year battery life in always-on IoT and telematics applications. |
| Switching Frequency Range | 350kHz to 2.5MHz - programmable via FREQ resistor or external SYNC clock; avoids AM radio band and enables compact magnetics. |
| Feedback Reference Voltage | 0.8V ±2% - precision reference enabling accurate output regulation across temperature and line/load conditions. |
| Power Good Threshold | ±10% of VOUT - open-drain PG signal asserts after deglitch timer (30μs rise, 50μs fall) for reliable system sequencing. |
| Minimum On-Time | 80ns - supports high input-to-output voltage 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 thermal design; automatic recovery upon cooling. |
Pinout & Package
MP9843GL-P is housed in a thermally enhanced QFN-16 (3mm × 4mm, 0.5mm pitch) package with exposed thermal pad (PGND-connected) for efficient heat dissipation in space-constrained automotive and industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PHASE | Synchronization phase control | Configures in-phase or 180° out-of-phase operation relative to SYNC clock; enables interleaved parallel operation to reduce input ripple. |
| 2 VIN | Main power input | Supplies internal control circuitry and high-side switch; requires local 4.7–10μF ceramic decoupling with 0.1μF high-frequency bypass. |
| 3,10 SW | Switch node | Drives external inductor; high dv/dt node requiring minimized trace area and tight coupling to PGND. |
| 4,9 PGND | Power ground | Reference for power stage; must be connected to large copper pour with multiple vias to thermal pad for low-impedance return path. |
| 5 EN | Enable control | Digital enable/disable with 0.9–1.2V threshold; pulls device into 2μA shutdown state when low. |
| 6 SYNC | Frequency sync & mode select | Accepts 350kHz–2.5MHz external clock; high logic level enables forced CCM, low/floating enables AAM. |
| 7 PG | Power good indicator | Open-drain output asserting when VOUT is within ±10% of target; requires external pull-up for system monitoring. |
| 8 BIAS | Efficiency-boosting bias supply | Accepts 5–18V external supply to reduce internal LDO losses; improves full-load efficiency by up to 2% when used. |
| 11 BST | Bootstrap supply | Charges internal high-side gate driver; requires 0.1μF ceramic capacitor between BST and SW for reliable HS-FET turn-on. |
| 12 VCC | Internal bias rail | Regulated ~5V supply for control logic; requires ≥1μF ceramic decoupling to AGND. |
| 13 AGND | Analog ground | Reference for FB, SS, and error amplifier; must be separated from PGND and joined at single point near IC. |
| 14 SS | Soft-start timing | Internal 10μA current source charges external capacitor; sets ramp time and prevents output overshoot during startup. |
| 15 FB | Voltage feedback input | Monitors resistor divider output; 0.8V reference enables precise output setting (e.g., 3.3V with 41.2kΩ/13kΩ). |
| 16 FREQ | Frequency programming | Resistor-to-ground sets oscillator frequency per RFREQ = 170000 / fSW(kHz) (kΩ); enables deterministic EMI tuning. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 14μA no-load IQ and 2μA shutdown current - extends battery runtime in always-on vehicle modules and portable diagnostics tools. |
| Integrated dual-MOSFET power stage | 125mΩ HS + 55mΩ LS RDS(on) - eliminates external switch losses and reduces BOM count for compact 3A solutions. |
| Programmable switching frequency | 350kHz–2.5MHz via resistor or SYNC - enables EMI compliance in noise-sensitive infotainment and ADAS subsystems. |
| Advanced Asynchronous Mode (AAM) | Automatic transition to PSM at light loads - sustains >85% efficiency down to 1mA output current without external intervention. |
| BST refresh & low dropout operation | Maintains regulation at >95% duty cycle - supports 24V→3.3V conversion under cold-crank (≤6V input) without dropout. |
| Hiccup over-current protection | Cycle-by-cycle current limit + auto-retry on short-circuit - prevents thermal runaway while enabling safe fault recovery in wiring harness applications. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers 3.3V SoC, display interface, and audio codec in head-unit under varying battery voltage (6V–16V) and engine cranking. IC Role / Device Role / Timing Role: Primary 3A buck regulator with pre-bias start-up and ±10% PG monitoring for safe boot sequencing. Use Value: 14μA IQ prevents parasitic drain during vehicle sleep; 80ns min-on-time ensures stable 3.3V output even at 6V input. |
Use Scenario: Generates isolated 5V rail for digital I/O isolation barriers and sensor signal conditioning in factory automation controllers. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter accepting 24V field supply and delivering regulated 5V at up to 3A. Use Value: AAM mode maintains >90% efficiency at 10mA standby load; SYNC pin allows synchronization with main controller clock to suppress beat frequencies. |
| Telematics Control Unit (TCU) | Portable Diagnostic Tool |
|
Use Scenario: Supplies 3.3V to LTE modem, GNSS receiver, and microcontroller in always-connected vehicle tracking devices. IC Role / Device Role / Timing Role: Main system power regulator with BIAS pin connected to 5V USB input to maximize efficiency during wired operation. Use Value: 2μA shutdown current enables <1μA system standby; hiccup OCP protects against antenna cable shorts during field deployment. |
Use Scenario: Powers ARM-based diagnostic interface operating from 9V–32V vehicle battery or bench supply during service garage use. IC Role / Device Role / Timing Role: Single-chip 3A buck solution replacing discrete controllers + MOSFETs; supports wide VIN for universal compatibility. Use Value: QFN-16 (3×4mm) footprint minimizes PCB area; thermal shutdown with 20°C hysteresis prevents damage during prolonged 3A bench testing. |
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 |
|---|---|---|---|
| MPQ4433-AEC1 | Automotive-grade (AEC-Q100 Grade 1), 40V/3.5A, 17μA IQ, fixed 2.2MHz frequency | Requires no frequency programming; higher VIN max and tighter temp range (–40°C to +125°C junction) | Preferred for production automotive ECUs where qualification and fixed-frequency EMI control are mandatory. |
| LM61480-Q1 | Automotive 42V/8A, 15μA IQ, spread-spectrum EMI reduction, adjustable soft-start | Higher current capability and integrated EMI suppression; larger QFN-16 (4×4mm) package | Selected when scaling to >3A loads or when board-level EMI filtering must be minimized in crowded chassis environments. |
Compared with MP9843GL-P, MPQ4433-AEC1 offers drop-in automotive qualification but lacks frequency programmability and SYNC-driven mode selection; LM61480-Q1 delivers higher current and EMI features at the cost of larger footprint and reduced light-load optimization granularity.
Availability
MP9843GL-P is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O modules, telematics control units, and portable diagnostic tools requiring stable component supply across extended temperature and voltage ranges.
Supply support for MP9843GL-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP9843 belongs to MPS's high-voltage synchronous buck converter product line, engineered specifically for automotive and industrial applications demanding wide input range, ultra-low quiescent current, and robust protection in harsh electrical environments.
FAQ
What is the recommended layout practice for the PGND and AGND pins on MP9843GL-P?
PGND (pins 4 and 9) must be connected to a large, low-impedance copper pour tied directly to the thermal pad with ≥6 thermal vias; AGND (pin 13) should be routed separately and joined to PGND at a single point near the IC. This separation prevents switching noise from corrupting the feedback and soft-start signals, ensuring stable regulation and accurate power-good assertion.
Can MP9843GL-P operate with a 5V input and 3.3V output at 3A continuously?
Yes - with VIN = 5V and VOUT = 3.3V, the MP9843GL-P operates at ~66% duty cycle and remains within thermal limits using the QFN-16 package with standard 4-layer PCB layout (θJA ≈ 48°C/W). Full 3A continuous output is achievable provided the inductor DCR is ≤15mΩ and input/output capacitors meet RMS current ratings.
How does the BIAS pin improve efficiency, and what happens if it is left unconnected?
Connecting a 5–18V supply to BIAS powers the internal gate drivers and control logic directly, bypassing the VIN-to-VCC LDO and reducing conduction loss. If left floating or grounded, the IC defaults to internal VCC regulation from VIN - functional but with ~1–2% lower full-load efficiency and higher thermal stress at high input voltages.
Is pre-bias start-up supported, and how does it behave when FB voltage is non-zero at enable?
Yes - MP9843GL-P supports pre-bias start-up. When FB > (SS − 150mV) at EN assertion, both HS- and LS-FETs remain off until SS voltage exceeds FB. This prevents reverse current flow into a pre-charged output, protecting downstream circuitry and avoiding uncontrolled inrush into existing bus capacitance.
What is the minimum external resistor value for the FREQ pin, and why is there a lower limit?
The minimum recommended RFREQ is 27kΩ (for ~2.5MHz operation). Lower values increase internal oscillator current and may cause timing jitter or frequency instability due to comparator propagation delay limitations; the datasheet specifies 27kΩ as the validated lower bound for guaranteed 2.5MHz operation across temperature and process corners.
Does MP9843GL-P support output capacitor ESR monitoring or feedforward compensation?
No - the MP9843GL-P uses a fixed internal compensation network optimized for standard ceramic output capacitors (low ESR). It does not provide access to the error amplifier output (VCOMP) or support external type-II/type-III compensation; stability relies on proper selection of output capacitance (≥22μF) and ESR < 5mΩ per the datasheet guidelines.
How does the PHASE pin affect operation when only one MP9843GL-P is used?
When only one device is present, the PHASE pin has no functional impact - it can be left floating or tied to GND/VIH without affecting regulation, efficiency, or protection behavior. Its sole purpose is phase alignment in multi-phase configurations; unused states are electrically benign and do not alter internal timing or control loops.
MP9843GL-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:
- 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-P FAQ
1.How can I place an order for MP9843GL-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP9843GL-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 MP9843GL-P reliable?
The price and inventory of MP9843GL-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP9843GL-P is usually 5 days.
3.What payment methods are accepted for MP9843GL-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9843GL-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP9843GL-P?
MP9843GL-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP9843GL-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 MP9843GL-P?
For technical support, including MP9843GL-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9843GL-P requirements.
6.How does Aetrix verify that MP9843GL-P is sourced from the original manufacturer or authorized distributors?
All MP9843GL-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 MP9843GL-P meets industry standards.
7.What is the process for return or replacement of MP9843GL-P?
All MP9843GL-P units undergo pre-shipment inspection (PSI). If there is an issue with MP9843GL-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 MP9843GL-P part is unused and in its original packaging.
Return procedure for MP9843GL-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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