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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP9841GL-Z

Name: MP9841GL-Z
Brand: Monolithic Power Systems Inc.
SKU: MP9841GL-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP9841GL-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-PowerVQFN

Datasheet:: MP9841GL-Z.pdf

Description:: IC REG BUCK ADJ 1A 16QFN

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Product details

Overview

MP9841GL-Z from Monolithic Power Systems is a 36V, 1A synchronous step-down DC/DC converter with integrated 125mΩ high-side and 115mΩ low-side MOSFETs, programmable 350kHz–2.5MHz switching frequency, 14μA no-load quiescent current, and power-good (PG) output. It operates across 3.3V–36V input range and delivers stable 3.3V/5V outputs in automotive infotainment power rails and industrial sensor node supplies.

For engineers reviewing the MP9841GL-Z datasheet, MP9841GL-Z pinout, MP9841GL-Z application, or MP9841GL-Z equivalent, key selection criteria include its AEC-Q100-qualified operation, selectable forced CCM/AAM mode, 80ns minimum on-time for high-duty-cycle regulation, and QFN-16 (3mm×4mm) thermal performance with θJA = 48°C/W.

Technical Context

The MP9841GL-Z employs peak-current-mode control with internal error amplifier referenced to 0.8V feedback threshold, enabling fast transient response and simplified loop compensation. Its dual-mode operation-forced continuous conduction mode (CCM) or advanced asynchronous mode (AAM)-is selected via SYNC pin logic level at startup.

Bootstrap charging is managed by an internal regulator maintaining ~5V between BST and SW, with automatic BST refresh during low-V_BST conditions to sustain >95% duty cycle operation. Thermal shutdown activates at 170°C with 20°C hysteresis, and hiccup-mode over-current protection responds to output short-circuit events.

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	1A continuous - sufficient for powering microcontrollers, CAN transceivers, and analog front-ends in compact embedded systems.
Quiescent Current	14μA at no load - enables multi-year battery life 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 small external component selection.
Feedback Reference	0.8V ±2% - precise reference enables accurate output voltage setting with standard 1% resistors (e.g., 3.3V via 41.2kΩ/13kΩ divider).
Min On-Time	80ns - supports high-input-to-low-output conversion ratios (e.g., 24V→3.3V at ~14% duty cycle) without pulse-skipping instability.
Power Good Threshold	±10% of V_OUT - open-drain PG signal asserts after deglitch timer (30μs rise / 50μs fall) for reliable system power sequencing.

Pinout & Package

MP9841GL-Z is housed in a thermally enhanced QFN-16 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad (PGND-connected) for PCB heat dissipation. Pin 1 is marked with dot; top marking includes "MP" prefix, year/week code, and lot number.

Pin/Terminal	Circuit Role	Design Meaning
1 PHASE	SYNC phase select	Logic input to configure in-phase or 180° out-of-phase operation when paralleling multiple MP9841GL-Z for reduced input ripple.
2 VIN	Main input supply	Accepts 3.3V–36V; powers internal circuitry and high-side switch; requires local 4.7µF ceramic decoupling.
3,10 SW	Switch node	Drives external inductor; connects internally to both MOSFETs; high dv/dt node requiring tight layout and Kelvin grounding.
4,9 PGND	Power ground	High-current return path for MOSFETs and inductor; must be connected to thermal pad and separate from AGND plane.
5 EN	Enable control	Digital input (0.9V–1.2V threshold); pulls device into 2μA shutdown when low; must not be left floating.
6 SYNC	Frequency sync & mode select	Accepts 350kHz–2.5MHz external clock; also selects CCM (high) or AAM (low/floating) at startup.
7 PG	Power good indicator	Open-drain output asserting low when V_OUT deviates >±10%; requires external pull-up for MCU reset or sequencing logic.
8 BIAS	External bias supply	Optional 5V–18V input to reduce V_IN power loss and improve efficiency; float or tie to GND if unused.
11 BST	Bootstrap supply	Charges internal high-side driver via 0.1µF–1µF capacitor to SW; critical for sustaining high-duty-cycle operation.
12 VCC	Internal bias rail	Internally regulated ~5V supply for gate drivers and logic; requires ≥1µF ceramic decoupling to AGND.
13 AGND	Analog ground	Reference for FB, SS, and error amplifier; must be star-connected to PGND at single point near IC.
14 SS	Soft-start timing	Capacitor-based ramp (10µA internal current source) controlling output voltage slew rate and inrush limiting.
15 FB	Voltage feedback	0.8V reference comparator input; connects to resistor divider; sensitive node requiring short, shielded trace routing.
16 FREQ	Frequency programming	Resistor-to-ground sets oscillator frequency per R_FREQ = 170000/f_SW(kHz); enables precise EMI band placement.

Key Features

Feature	Design Value
Ultra-low quiescent current	14μA no-load IQ enables >10-year battery life in always-on automotive body electronics and remote sensors.
Integrated power MOSFETs	125mΩ HS + 115mΩ LS switches eliminate external FETs and gate drivers, reducing BOM count and board area by >30%.
Selectable CCM/AAM mode	SYNC pin configures fixed-frequency CCM (low ripple) or adaptive AAM (high light-load efficiency), eliminating need for external mode control logic.
Low dropout operation	BST refresh circuit sustains >95% duty cycle, enabling 24V→3.3V conversion without external LDO post-regulation.
Hiccup over-current protection	Auto-retry short-circuit recovery prevents thermal runaway during sustained overload, supporting unattended industrial deployments.

Applications

Automotive Infotainment

Industrial Sensor Node

Use Scenario: Powering display controller, audio codec, and touch interface in 12V vehicle head units with cold-crank tolerance.

IC Role / Device Role / Timing Role: Primary 3.3V/5V buck regulator delivering regulated power under dynamic load steps and wide input transients.

Use Value: 36V max input withstands load-dump spikes; 14μA IQ extends backup battery runtime during ignition-off monitoring.

Use Scenario: Supplying ultra-low-power microcontroller, MEMS accelerometer, and LoRaWAN transceiver in battery-operated factory floor sensors.

IC Role / Device Role / Timing Role: Main system power converter operating in AAM mode during sleep cycles and transitioning to CCM during data transmission bursts.

Use Value: 2μA shutdown current and 14μA no-load IQ enable multi-year deployment without battery replacement.

Telematics Control Unit

Rail-to-Rail Industrial PLC I/O

Use Scenario: Generating isolated 5V rail for GPS/GNSS module and cellular modem in vehicle tracking devices with CAN bus interface.

IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter stepping 24V vehicle power to 5V, synchronized to system clock via SYNC pin.

Use Value: Programmable 350kHz–2.5MHz frequency avoids noise coupling into sensitive RF receivers and meets CISPR-25 Class 5 limits.

Use Scenario: Providing stable 3.3V supply to FPGA configuration memory and ADC reference in modular industrial I/O cards with 24V backplane input.

IC Role / Device Role / Timing Role: Compact, thermally robust buck stage replacing discrete solutions in space-constrained DIN-rail mounted enclosures.

Use Value: QFN-16 package with exposed thermal pad achieves 125°C junction temperature margin at 1A load with minimal heatsinking.

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
MPQ4431GQ-A	AEC-Q100 qualified 36V/2A converter with 25μA IQ, fixed 2.2MHz frequency, no SYNC/PHASE pins.	Lacks frequency synchronization and phase control; better suited for cost-sensitive single-rail designs without EMI coordination needs.	Choose when higher output current (2A) is required and programmable frequency is unnecessary.
TPS54332DR	36V/3A converter with 100μA IQ, adjustable soft-start, but no AAM mode or BST refresh for high-duty-cycle operation.	Higher IQ reduces battery life; lacks low-dropout capability for 24V→3.3V direct conversion.	Prefer when 3A output and TI ecosystem support outweigh efficiency and dropout requirements.

Compared with MP9841GL-Z, MPQ4431GQ-A trades programmability and phase control for higher current, while TPS54332DR sacrifices light-load efficiency and high-duty-cycle capability for broader vendor support and higher output rating.

Availability

MP9841GL-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, telematics control units, and rail-to-rail PLC I/O requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MP9841GL-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 MP9841 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for AEC-Q100 compliance, wide-input operation, and ultra-low quiescent current in harsh-temperature environments.

FAQ

What is the maximum allowable input voltage for MP9841GL-Z, and what happens above that limit?

The absolute maximum input voltage is 40V. Exceeding this rating risks permanent damage to the internal high-side MOSFET and control circuitry due to oxide breakdown or junction overvoltage. The device incorporates under-voltage lockout (UVLO) that disables operation below 2.4V but provides no overvoltage protection - external TVS or crowbar circuits are required for load-dump transients exceeding 40V.

How does the MP9841GL-Z achieve 14μA quiescent current, and under what conditions is it measured?

The 14μA IQ is achieved through deep-sleep state activation in Advanced Asynchronous Mode (AAM), where the internal oscillator halts and only essential bias circuits remain active. It is measured at TJ = +25°C, V_FB = 0.85V (no load), with no switching activity and EN high - representing true no-load standby consumption in battery-backed systems.

Can MP9841GL-Z operate with 100% duty cycle, and what limits its maximum duty cycle?

No, MP9841GL-Z cannot sustain true 100% duty cycle due to bootstrap capacitor recharge requirements. Its effective maximum duty cycle is limited by BST voltage decay; when V_BST–V_SW drops below 2.5V, the high-side FET is disabled to allow low-side conduction and BST refresh. This mechanism enables >95% duty cycle in practice, sufficient for 24V→3.3V conversion.

What is the purpose of the BIAS pin, and when should it be used?

The BIAS pin accepts an external 5V–18V supply to power the internal gate drivers and regulators, bypassing the VIN-to-VCC linear regulator. Use BIAS when VIN exceeds 12V to reduce power dissipation and improve full-load efficiency by up to 3%; leave floating or tie to GND if VIN ≤ 12V or when board space prohibits adding a secondary supply.

How is the soft-start time determined, and can it be adjusted for sequencing with other rails?

Soft-start time is set by an external capacitor on the SS pin, charged by a precision 10μA internal current source. Time = (C_SS × 0.8V) / 10μA. For sequencing, connect SS to an external voltage ramp or another regulator's PG signal to coordinate power-up order - the MP9841GL-Z will track the applied SS voltage until it exceeds 0.8V.

Does MP9841GL-Z support pre-bias start-up, and how does it behave if the output is already powered?

Yes, MP9841GL-Z supports pre-bias start-up. If FB voltage exceeds SS – 150mV at enable, both high-side and low-side FETs remain off until SS rises above FB. This prevents reverse current flow and output voltage collapse, making it safe for hot-swap and redundant power supply applications.

What thermal derating applies to the QFN-16 package at elevated ambient temperatures?

With θ_JA = 48°C/W on a 4-layer PCB, the maximum continuous output current derates linearly above +25°C ambient: at +85°C ambient, max current drops to ~0.7A; at +105°C, it falls to ~0.5A. Full 1A operation requires junction temperature ≤125°C, achievable with ≥2cm² copper pour and 4+ thermal vias under the exposed pad.

MP9841GL-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:: 1A

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)

MP9841GL-Z FAQ

1.How can I place an order for MP9841GL-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP9841GL-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 MP9841GL-Z reliable?

The price and inventory of MP9841GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP9841GL-Z is usually 5 days.

3.What payment methods are accepted for MP9841GL-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9841GL-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP9841GL-Z?

MP9841GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP9841GL-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 MP9841GL-Z?

For technical support, including MP9841GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9841GL-Z requirements.

6.How does Aetrix verify that MP9841GL-Z is sourced from the original manufacturer or authorized distributors?

All MP9841GL-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 MP9841GL-Z meets industry standards.

7.What is the process for return or replacement of MP9841GL-Z?

All MP9841GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP9841GL-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 MP9841GL-Z part is unused and in its original packaging.

Return procedure for MP9841GL-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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