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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Gate Drivers

Monolithic Power Systems Inc. MP1921GQ-B-Z

Name: MP1921GQ-B-Z
Brand: Monolithic Power Systems Inc.
SKU: MP1921GQ-B-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP1921GQ-B-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Gate Drivers

Package:: 10-VFDFN Exposed Pad

Datasheet:: MP1921GQ-B-Z.pdf

Description:: IC GATE DRVR HALF-BRIDGE 10QFN

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Product details

Overview

MP1921GQ-B-Z from Monolithic Power Systems is a 100V, 2.5A high-frequency half-bridge N-channel MOSFET gate driver in QFN10 (3mm×3mm) package. It features independently controlled high-side and low-side drivers with <5ns propagation matching, integrated bootstrap diode, and dual UVLO protection. Used in telecom DC/DC converters driving 1nF loads with 12ns/9ns rise/fall times at 12V VDD.

For engineers reviewing the MP1921GQ-B-Z datasheet, MP1921GQ-B-Z pinout, MP1921GQ-B-Z application, or MP1921GQ-B-Z equivalent, key selection criteria include bootstrap voltage range (120V), propagation delay (16ns typ), gate drive matching (<5ns), quiescent current (<150µA), and QFN10 thermal performance (θJA = 50°C/W).

Technical Context

The MP1921GQ-B-Z implements a level-shifted floating driver architecture to control high-side N-MOSFETs in half-bridge topologies, with independent TTL-compatible INH/INL inputs enabling dead-time programmability. Its internal bootstrap diode supports up to 120V BST-to-SW differential voltage and handles 100mA forward current with 0.9V VF.

UVLO thresholds are set at 8.1V (VDD) and 7.1V (VBST–SW) with 0.5V/0.55V hysteresis, forcing both DRVH and DRVL low during undervoltage conditions. Propagation delays are matched within ±2.5ns across temperature (–40°C to +125°C), ensuring precise timing in >1MHz switching applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_SW Max	100V - Enables direct use in 48V telecom and 100V industrial bus systems without external level-shifting.
DRVH/DRVL Peak Current	2.5A pull-up / 3.5A pull-down - Drives 1nF gate capacitance with 12ns/9ns edges at 12V, supporting >1MHz PWM.
Propagation Delay	16ns typ - Ensures minimal timing skew between control input and gate output for tight dead-time control.
Gate Drive Matching	<5ns - Guarantees simultaneous turn-on/turn-off of high- and low-side FETs to prevent shoot-through.
Bootstrap Diode V_F	0.9V @ 100mA - Reduces external component count and improves efficiency vs. discrete bootstrap solutions.
Quiescent Current	150µA max - Minimizes standby power loss in always-on power supply controllers.
Operating Temp Range	–40°C to +125°C - Validated for avionics and industrial environments with full parameter guarantee.

Pinout & Package

MP1921GQ-B-Z is housed in a thermally enhanced QFN10 (3mm×3mm) package with exposed thermal pad (Pin 9). The package supports 2.5W continuous power dissipation at 25°C ambient and requires PCB land pattern per JEDEC MO-229 VEED-5.

Pin/Terminal	Circuit Role	Design Meaning
1 VDD	Low-side supply input	Power source for internal logic and low-side driver; requires local 0.1µF decoupling to VSS.
3 BST	Bootstrap supply node	Connects to SW via 0.1µF capacitor; supplies floating high-side driver with up to 120V differential capability.
4 DRVH	Floating high-side gate output	Drives N-MOSFET gate referenced to SW; rated for 100V swing relative to SW node.
5 SW	Switching node	Connection point between high-side and low-side MOSFETs; serves as return for BST capacitor and reference for DRVH.
7 INH	High-side enable input	TTL-compatible signal controlling DRVH; must be sequenced with INL to enforce dead time and avoid shoot-through.
8 INL	Low-side enable input	TTL-compatible signal controlling DRVL; independent control enables flexible PWM and synchronous rectification schemes.
9 VSS / Exposed Pad	Ground reference & thermal path	Primary ground return and thermal conduction path; must be soldered to large copper pour for θJA = 50°C/W.
10 DRVL	Low-side gate output	Drives N-MOSFET gate referenced to VSS; delivers 2.5A peak sink current for fast turn-off.

Key Features

Feature	Design Value
Integrated bootstrap diode	Eliminates external diode, reduces BOM count by one component, and improves reliability in high-reliability telecom systems.
Dual independent UVLO	Separate 8.1V VDD and 7.1V (VBST–SW) thresholds prevent false triggering during startup or transient brownout events.
Matched propagation delay	<5ns difference between DRVH and DRVL ensures consistent timing margins across process, voltage, and temperature.
120V BST voltage range	Supports high-input-voltage topologies like active-clamp forward converters where V_SW swings exceed 100V.
TTL-compatible inputs	Accepts standard 0V/3.3V or 0V/5V logic levels without external level shifters, simplifying controller interface design.

Applications

Telecom Half-Bridge Power Supplies

Avionics DC/DC Converters

Use Scenario: 48V input, 12V/20A isolated DC/DC module in 19-inch rack-mounted telecom equipment.

IC Role / Device Role / Timing Role: Gate driver for synchronous half-bridge primary-side MOSFETs operating at 500kHz–1MHz with programmable dead time.

Use Value: 16ns propagation delay and <5ns matching minimize dead-time overhead, increasing converter efficiency by ~0.8% at full load.

Use Scenario: 28V aircraft bus-fed 5V/10A DC/DC converter in flight control actuator electronics.

IC Role / Device Role / Timing Role: High-reliability gate driver enabling radiation-tolerant layout with dual UVLO and thermal pad grounding.

Use Value: Exposed thermal pad and –40°C to +125°C guaranteed operation ensure stable gate drive under rapid ambient transients during takeoff/landing.

Two-Switch Forward Converters

DC Motor Drivers

Use Scenario: Industrial 100V input, 24V/5A two-switch forward supply powering PLC I/O modules.

IC Role / Device Role / Timing Role: Simultaneous gate driver for both primary-side switches synchronized by single PWM signal on INH/INL.

Use Value: Independent INH/INL control allows precise overlap management during soft-start, preventing transformer saturation during line surges.

Use Scenario: 48V battery-powered 20A brushed DC motor H-bridge in automated guided vehicle (AGV) traction control.

IC Role / Device Role / Timing Role: Half-bridge driver controlling high-side/low-side MOSFETs in bidirectional motor drive with regenerative braking.

Use Value: 2.5A peak pull-down current ensures sub-100ns turn-off of low-side FET, minimizing shoot-through risk during direction reversal.

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge gate driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRS21844SPbF	Higher 600V V_BS rating but no integrated bootstrap diode; 20ns propagation delay; SOIC-8 package.	Preferred in industrial motor drives requiring higher voltage margin; lacks QFN thermal performance.	Select when >120V bootstrap swing or through-hole assembly is required; add external bootstrap diode.
LM5109BMAX	100V V_DD max; no BST diode; 25ns propagation; HTSSOP-8; lower peak current (1.5A).	Suitable for cost-sensitive 48V telecom supplies with relaxed switching speed requirements.	Choose for lower-cost designs where 12ns edge speed and 2.5A drive are not mandatory.

Compared with IRS21844SPbF and LM5109BMAX, MP1921GQ-B-Z delivers superior high-frequency performance (16ns delay, <5ns matching), integrated BST diode, and QFN10 thermal efficiency-making it optimal for compact, high-efficiency 500kHz–2MHz telecom and avionics converters.

Availability

MP1921GQ-B-Z is available at Aetrix Electronics and suitable for telecom power supplies, avionics DC/DC converters, and two-switch forward converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP1921GQ-B-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 power management ICs, founded in 1997 and headquartered in Kirkland, WA.

The MP1921 product line targets high-frequency, high-voltage half-bridge gate drivers for telecom, aerospace, and industrial DC/DC conversion-designed to replace discrete driver + bootstrap diode solutions with integrated, thermally optimized QFN packages.

FAQ

What is the maximum allowable V_SW voltage for MP1921GQ-B-Z?

The absolute maximum V_SW rating is +105V, with recommended operating limit at +100V. This enables direct use in 48V telecom systems with 100V transient tolerance and compatibility with two-switch forward topologies operating up to 100V input.

Does MP1921GQ-B-Z require an external bootstrap diode?

No. MP1921GQ-B-Z integrates a bootstrap diode with 0.9V forward voltage at 100mA and 2.5Ω dynamic resistance. External diodes are unnecessary unless higher current (>100mA) or lower VF (<0.7V) is required for specific thermal or efficiency targets.

How is shoot-through prevented in MP1921GQ-B-Z designs?

Shoot-through is prevented by independent INH/INL control, requiring external dead-time insertion in the PWM controller. The device itself does not embed dead-time logic; instead, its <5ns gate matching and 16ns propagation delay enable precise external timing control to maintain safe non-overlap between high-side and low-side FET conduction.

What is the thermal pad connection requirement for QFN10 package?

The exposed thermal pad (Pin 9) must be soldered to a solid copper plane tied to VSS. Per JEDEC MO-229 VEED-5, minimum recommended land area is 2.5mm×2.5mm with ≥4 thermal vias (0.3mm diameter) connecting to inner ground layers to achieve θJA = 50°C/W.

Can MP1921GQ-B-Z drive GaN HEMTs?

Yes-its 12ns/9ns rise/fall times, 2.5A peak drive strength, and <5ns matching meet typical GaN gate requirements. However, layout parasitics must be minimized, and gate resistor tuning is recommended to control dV/dt and prevent oscillation in high-speed GaN switching.

What is the minimum input pulse width supported?

The minimum input pulse width that reliably changes the output is 50ns, guaranteed by design. This supports PWM frequencies up to 10MHz in burst-mode or digital control schemes where narrow pulses are used for fine-grained regulation.

Is MP1921GQ-B-Z pin-compatible with earlier MP1921 variants?

Yes-MP1921GQ-B-Z shares identical QFN10 pinout, electrical characteristics, and thermal behavior with MP1921GQ-B. The "–Z" suffix denotes tape-and-reel packaging only; no functional or mechanical differences exist between the two orderables.

MP1921GQ-B-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: MP

Package/Case:: 10-VFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: -

Driven Configuration:: Half-Bridge

Channel Type:: Independent

Number of Drivers:: 2

Gate Type:: N-Channel MOSFET

Voltage - Supply:: 9V ~ 18V

Logic Voltage - VIL, VIH:: -

Current - Peak Output (Source, Sink):: 2.5A

Input Type:: Non-Inverting

High Side Voltage - Max (Bootstrap):: 120 V

Rise / Fall Time (Typ):: 12ns, 9ns

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-QFN (3x3)

MP1921GQ-B-Z FAQ

1.How can I place an order for MP1921GQ-B-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP1921GQ-B-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 MP1921GQ-B-Z reliable?

The price and inventory of MP1921GQ-B-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1921GQ-B-Z is usually 5 days.

3.What payment methods are accepted for MP1921GQ-B-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1921GQ-B-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP1921GQ-B-Z?

MP1921GQ-B-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP1921GQ-B-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 MP1921GQ-B-Z?

For technical support, including MP1921GQ-B-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1921GQ-B-Z requirements.

6.How does Aetrix verify that MP1921GQ-B-Z is sourced from the original manufacturer or authorized distributors?

All MP1921GQ-B-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 MP1921GQ-B-Z meets industry standards.

7.What is the process for return or replacement of MP1921GQ-B-Z?

All MP1921GQ-B-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP1921GQ-B-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 MP1921GQ-B-Z part is unused and in its original packaging.

Return procedure for MP1921GQ-B-Z:

1.Submit a request within 90 days.

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

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