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

STMicroelectronics PM8841D

Name: PM8841D
Brand: STMicroelectronics
SKU: PM8841D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PM8841D

Manufacturer:: STMicroelectronics

Category:: Gate Drivers

Package:: SC-74A, SOT-753

Datasheet:: PM8841D.pdf

Description:: IC GATE DRVR LOW-SIDE SOT23-5

Quantity:: RFQ Add To RFQ list

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Inventory:7,648

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Product details

Overview

PM8841D from STMicroelectronics is a single-channel low-side MOSFET gate driver IC designed for digital power conversion systems. It delivers 1 A sink and 0.8 A source peak output current, operates from 10 V to 18 V supply, features externally adjustable input threshold via IN_TH pin (2–5.5 V), and supports -40 °C to 125 °C ambient operation in SOT23-5 package. It is used with STLUX™ microcontrollers in digitally controlled PFC boost converters.

For engineers reviewing the PM8841D datasheet, PM8841D pinout, PM8841D application, or PM8841D equivalent, key selection criteria include its asymmetric drive capability (1 A sink / 0.8 A source), input UVLO with 1.5 V threshold, short propagation delays (<30 ns), integrated pull-down resistors (100 kΩ on IN, 50 kΩ on OUT), and compatibility with high-frequency switching topologies requiring precise gate control.

Technical Context

The PM8841D implements a dedicated low-side driver architecture with independent input and output UVLO protection circuits, preventing unsafe MOSFET activation during undervoltage conditions. Its input threshold is fully defined by an external voltage applied to the IN_TH pin-enabling direct matching to MCU logic supply levels (e.g., 3.3 V or 5 V).

Propagation delay is tightly controlled at ≤30 ns (IN to OUT) under no-load conditions, and output rise/fall times are ≤20 ns into 470 pF load. The device integrates internal pull-downs on both IN and OUT pins (100 kΩ and 50 kΩ typ.), eliminating need for external biasing in most configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	10 V to 18 V - supports wide-input SMPS rails without external regulation
Output Sink/Source	1 A sink / 0.8 A source - enables fast turn-off and robust turn-on of medium-power MOSFETs
IN_TH Range	2 V to 5.5 V - allows flexible interface with 3.3 V or 5 V logic controllers
Propagation Delay	<30 ns - ensures timing accuracy in >1 MHz switching applications
Operating Temp	-40 °C to 125 °C - qualified for industrial and automotive under-hood environments
Input Pull-down	100 kΩ - guarantees known logic-low state when IN is floating or un-driven
UVLO Threshold	1.5 V on IN_TH - prevents false triggering during power-up/down sequences

Pinout & Package

The PM8841D is housed in a compact SOT23-5 surface-mount package with standard footprint and thermal performance (R_thJA = 250 °C/W on 2-layer FR4).

Pin/Terminal	Circuit Role	Design Meaning
VCC	IC power supply input	Accepts 10–18 V; requires local 100 nF ceramic bypass capacitor
GND	Reference ground connection	Common return path for supply, input, and output stages
IN	Digital enable input	Internally pulled down (100 kΩ); logic level referenced to IN_TH voltage
IN_TH	Input threshold reference	Sets VIH/VIL thresholds as % of applied voltage (e.g., 3.3 V → VIH ≈ 1.9 V)
OUT	Gate drive output	Push-pull output with 50 kΩ internal pull-down; drives MOSFET gate directly

Key Features

Feature	Design Value
Asymmetric drive strength	1 A sink / 0.8 A source - optimizes EMI reduction during turn-on while minimizing turn-off delay
External threshold programming	IN_TH pin accepts 2–5.5 V - eliminates level-shifting components when interfacing with mixed-voltage MCUs
Dual-stage UVLO	Independent UVLO on VCC and IN_TH - prevents erratic behavior during brown-out or partial power-up
Integrated pull-downs	100 kΩ on IN, 50 kΩ on OUT - ensures safe default states without external resistors

Applications

Digitally Controlled PFC Boost Converter

Digitally Controlled Flyback Converter

Use Scenario: High-efficiency AC-DC front-end with digital control loop executing peak-current mode modulation.

IC Role / Device Role / Timing Role: Low-side gate driver for main boost MOSFET; synchronizes switching with STLUX™ controller's PWM output and IN_TH-referenced logic thresholds.

Use Value: Enables <30 ns propagation delay and 1 A sink current to minimize dead-time uncertainty and reduce conduction losses in continuous conduction mode.

Use Scenario: Isolated DC-DC converter for industrial IoT sensors with tight size constraints and variable load profiles.

IC Role / Device Role / Timing Role: Gate driver for primary-side MOSFET; interfaces directly with 3.3 V digital controller using IN_TH tied to same rail.

Use Value: Integrated 100 kΩ IN pull-down and 50 kΩ OUT pull-down eliminate external biasing, reducing BOM count and PCB area in space-constrained designs.

Digitally Controlled Inverse Buck (LED Driver)

Wireless Battery Charger Transmitter

Use Scenario: Constant-current LED string driver with adaptive dimming and thermal foldback.

IC Role / Device Role / Timing Role: Low-side switch driver for inverse buck topology; driven by digital controller with dynamically adjusted IN_TH for temperature-compensated threshold.

Use Value: Adjustable input threshold allows real-time tuning of VIH/VIL to maintain noise margin across wide junction temperature range (-40 °C to 125 °C).

Use Scenario: Resonant wireless power transmitter operating at 100–205 kHz with digital frequency hopping.

IC Role / Device Role / Timing Role: Gate driver for half-bridge low-side MOSFET; leverages short propagation delay and fast rise/fall times (<20 ns) to maintain precise zero-voltage switching timing.

Use Value: 1 A sink capability ensures rapid gate discharge during hard-switching transitions, reducing body-diode conduction and improving efficiency at high Q-factor coils.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-side gate driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IRS2004SPBF	Higher 2 A sink / 2 A source; fixed 3.3 V logic threshold; no external IN_TH pin	Requires level-shifting for non-3.3 V controllers; better suited for high-current discrete MOSFETs	Select when higher drive strength is needed and controller voltage matches fixed threshold
UCC27524ADRV	1.5 A sink / 1.5 A source; dual-output; no UVLO on input stage; fixed 1.3 V threshold	Lacks IN_TH programmability and input-stage UVLO; requires external pull-downs	Select for dual-channel needs or where tighter drive symmetry outweighs safety features

Compared with IRS2004SPBF and UCC27524ADRV, the PM8841D uniquely combines externally adjustable logic thresholds, dual-stage UVLO, and integrated pull-downs-making it optimal for digitally controlled SMPS where MCU supply voltage varies or system-level fault prevention is critical.

Availability

PM8841D is available at Aetrix Electronics and suitable for digitally controlled PFC boost converters, flyback power supplies, LED drivers, and wireless battery charger transmitters requiring stable component supply and long-term industrial availability.

Supply support for PM8841D 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, analog chips, and MEMS sensors for industrial, automotive, and consumer markets.

The PM8841D belongs to ST's digital power driver family, engineered specifically to interface with STLUX™ digital power MCUs and deliver reliable, high-speed gate control in compact, thermally efficient packages for next-generation switched-mode power supplies.

FAQ

What is the minimum recommended IN_TH voltage for reliable operation?

The PM8841D specifies a minimum IN_TH voltage of 2 V per datasheet Table 4. Below this, input threshold hysteresis and VIH/VIL definitions become undefined. Operation at 2.0 V yields ~0.72 V VIH (36% of IN_TH) and ~0.5 V VIL (25%), providing adequate noise margin in low-voltage digital systems with clean supply rails.

Can the IN_TH pin be left unconnected or tied directly to VCC?

No-IN_TH must be actively driven within 2–5.5 V. Tying it directly to VCC (10–18 V) exceeds absolute maximum rating and risks damage. If VCC is used as reference, a resistor divider is mandatory. Floating IN_TH causes undefined input thresholds and may lead to erratic switching or latch-up.

Does the PM8841D support driving IGBTs?

Yes-the datasheet explicitly cites IGBT driving in Section 6.3, noting that asymmetric drive (stronger sink than source) helps prevent latch-up. With 1 A sink capability and fast fall time (<20 ns), it is suitable for low-to-medium power IGBTs in flyback or resonant topologies up to ~20 kHz switching frequency.

Is a bypass capacitor required on the VCC pin, and what value is recommended?

Yes-a 100 nF ceramic capacitor is mandatory and must be placed as close as possible to the VCC pin. This suppresses high-frequency current spikes during gate charging/discharging. Additional bulk capacitance (e.g., 1–10 μF tantalum or aluminum electrolytic) is recommended upstream for stability under dynamic load conditions.

PM8841D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SC-74A, SOT-753

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Driven Configuration:: Low-Side

Channel Type:: Single

Number of Drivers:: 1

Gate Type:: N-Channel, P-Channel MOSFET

Voltage - Supply:: 10V ~ 18V

Logic Voltage - VIL, VIH:: -

Current - Peak Output (Source, Sink):: 800mA, 1A

Input Type:: Non-Inverting

High Side Voltage - Max (Bootstrap):: -

Rise / Fall Time (Typ):: 20ns, 20ns (Max)

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-5

PM8841D FAQ

1.How can I place an order for PM8841D through Aetrix?

Please submit a Request for Quotation (RFQ) for PM8841D 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 PM8841D reliable?

The price and inventory of PM8841D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PM8841D is usually 5 days.

3.What payment methods are accepted for PM8841D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PM8841D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PM8841D?

PM8841D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PM8841D 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 PM8841D?

For technical support, including PM8841D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PM8841D requirements.

6.How does Aetrix verify that PM8841D is sourced from the original manufacturer or authorized distributors?

All PM8841D 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 PM8841D meets industry standards.

7.What is the process for return or replacement of PM8841D?

All PM8841D units undergo pre-shipment inspection (PSI). If there is an issue with PM8841D, 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 PM8841D part is unused and in its original packaging.

Return procedure for PM8841D:

1.Submit a request within 90 days.

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

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