My Inquiry
My Account
STMicroelectronics PM8851D
- Part No.:
- PM8851D
- Manufacturer:
- STMicroelectronics
- Category:
- Gate Drivers
- Package:
- SOT-23-6
- Datasheet:
-
PM8851D.pdf
- Description:
- IC GATE DRVR LOW-SIDE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:21,624
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PM8851D from STMicroelectronics is a single-channel low-side MOSFET gate driver with asymmetric 1 A sink / 0.8 A source capability, complementary SRC/SNK outputs, external input threshold reference (IN_TH), and UVLO-protected operation across 10–18 V supply and –40 °C to 125 °C ambient. It interfaces directly with STLUX™ digital power MCUs in digitally controlled PFC boost, flyback, and inverse buck converters.
For engineers reviewing the PM8851D datasheet, PM8851D pinout, PM8851D application, or PM8851D equivalent, key selection criteria include configurable input threshold voltage (2–5.5 V), sub-30 ns propagation delays, integrated pull-down resistors (100 kΩ typ.), dual-stage UVLO (input and output), and SOT23-6L footprint compatibility with high-density digital power layouts.
Technical Context
The PM8851D implements a dedicated low-side driver architecture with independent sourcing and sinking paths driven by a single IN signal, where logic thresholds are dynamically set via the externally biased IN_TH pin-enabling seamless interfacing with MCU I/Os at 1.8 V, 3.3 V, or 5 V logic levels. Its truth table defines SRC = VCC / SNK = GND during IN high, and both outputs Hi-Z during IN low.
Input and output UVLO circuits independently monitor VCC and IN_TH voltages, disabling drive outputs if either falls below its respective turn-on threshold (e.g., VCC,on ≈ 10 V, IN_TH,UV ≈ 1.5 V). Propagation delays remain ≤30 ns (IN to SRC/SNK) under no-load conditions, and rise/fall times are ≤20 ns into 470 pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sink current | 1.1 A max at VSNK = VCC/2 - enables fast MOSFET turn-off in high-dV/dt switching nodes |
| Source current | 940 mA max at VSRC = VCC/2 - supports controlled gate turn-on to limit EMI from Miller capacitance |
| Propagation delay | ≤30 ns (IN to SRC/SNK, no load) - preserves timing integrity in >1 MHz digital power control loops |
| Input threshold range | 2 V to 5.5 V on IN_TH pin - allows direct matching to MCU core/logic supply without level-shifting |
| Supply voltage range | 10 V to 18 V on VCC - accommodates unregulated auxiliary rails common in SMPS front-end stages |
| Operating temperature | –40 °C to 125 °C ambient - qualified for industrial and automotive under-hood power conversion environments |
| UVLO hysteresis | 0.5 V to 1 V on VCC - prevents oscillation during brown-out recovery in noisy power systems |
Pinout & Package
PM8851D is housed in a compact, surface-mount SOT23-6L package (JEDEC MO178AB compliant), optimized for proximity to power MOSFET gates to minimize parasitic inductance and EMI coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | IC power supply input | Accepts 10–18 V; powers internal logic, drivers, and pull-downs; requires local 100 nF ceramic bypass |
| GND | Reference ground connection | Common return path for VCC, IN, IN_TH, SRC, and SNK; must be low-impedance for stable UVLO and drive performance |
| IN | Digital enable/control input | CMOS-compatible signal with 100 kΩ internal pull-down; triggers complementary SRC/SNK action per truth table |
| IN_TH | Input threshold reference | Defines VIH/VIL as % of applied voltage (2–5.5 V); enables precise logic-level alignment with host MCU supply |
| SNK | Gate drive sinking output | Delivers up to 1.1 A sink current; actively pulls MOSFET gate to GND; includes 100 kΩ internal pull-down |
| SRC | Gate drive sourcing output | Delivers up to 940 mA source current; actively drives MOSFET gate toward VCC; includes 100 kΩ internal pull-down |
Key Features
| Feature | Design Value |
|---|---|
| Asymmetric drive strength | 1.1 A sink / 0.94 A source enables EMI-optimized turn-on and fast, robust turn-off in peak-current-mode topologies |
| Configurable input threshold | IN_TH pin accepts 2–5.5 V reference - eliminates external level shifters when interfacing with 1.8 V/3.3 V/5 V MCUs |
| Dual-stage UVLO protection | Independent monitoring of VCC and IN_TH ensures gate drive remains disabled until both supply and logic reference are valid |
| Integrated pull-down resistors | 100 kΩ (typ.) on IN, SRC, and SNK pins guarantees defined logic states during MCU reset or floating control conditions |
| Low propagation delay | ≤30 ns (IN to output) with <20 ns rise/fall into 470 pF - maintains tight timing margins in >1 MHz digital power controllers |
Applications
| Digitally Controlled PFC Boost Converter | Digitally Controlled Flyback Converter |
|---|---|
|
Use Scenario: High-efficiency AC-DC front-end with STLUX™ MCU managing variable-frequency, average-current-mode PFC. IC Role / Device Role / Timing Role: Low-side gate driver for main boost MOSFET; delivers asymmetric drive to suppress EMI during turn-on while ensuring rapid, jitter-free turn-off synchronized to MCU PWM edges. Use Value: Enables >98% efficiency at full load with <5% THD, leveraging sub-30 ns timing fidelity and 1.1 A sink current to minimize conduction loss during critical zero-crossing intervals. |
Use Scenario: Isolated DC-DC adapter for consumer electronics, using digital peak-current-mode control with adaptive demagnetization detection. IC Role / Device Role / Timing Role: Low-side driver for primary-side MOSFET; provides Hi-Z state during transformer reset and fast sink action to terminate conduction precisely at valley points. Use Value: Reduces switching loss by 18% vs. symmetric drivers, due to 1.1 A sink current enabling <100 ns turn-off delay and eliminating false triggering from reflected ringing. |
| Digitally Controlled Inverse Buck (LED Driver) | Wireless Battery Charger Transmitter |
|
Use Scenario: Constant-current LED string driver with digital dimming, thermal foldback, and fault reporting via I²C. IC Role / Device Role / Timing Role: Gate driver for low-side switch in inverse buck topology; handles 100–500 kHz PWM dimming with cycle-by-cycle current limiting. Use Value: Supports flicker-free dimming down to 0.1% duty cycle using 0.8 A source current for soft turn-on and 1.1 A sink for immediate current cutoff, minimizing LED current overshoot. |
Use Scenario: Resonant wireless charging transmitter operating at 100–205 kHz, requiring precise half-bridge timing and overtemperature shutdown coordination. IC Role / Device Role / Timing Role: Low-side driver for synchronous rectifier or half-bridge leg; interfaces with STM32G0-based charger controller via IN_TH-referenced logic. Use Value: Ensures <±2 ns channel-to-channel skew between SRC/SNK outputs, maintaining ZVS conditions across 10–100 W output range and preventing shoot-through under transient load steps. |
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 |
|---|---|---|---|
| IRS2005PBF | Fixed 3.3 V input threshold; no IN_TH pin; 2.5 A sink / 2.5 A source; SOIC-8 package | Requires external level shifting for non-3.3 V MCUs; higher drive current suits larger MOSFETs but increases EMI risk in compact layouts | Select when driving >100 mΩ Rds(on) MOSFETs at <500 kHz and fixed 3.3 V logic interface is acceptable |
| UCC27524ADR | Fixed 2.5 V input threshold; dual independent outputs; 5 A sink / 5 A source; SOIC-8 | Lacks configurable threshold and UVLO on input reference; higher drive capability demands careful layout to avoid ringing | Prefer for high-power LLC resonant converters where 5 A drive and split outputs justify larger footprint and added complexity |
Compared with IRS2005PBF and UCC27524ADR, PM8851D offers unique configurability via IN_TH for mixed-voltage systems, tighter propagation control (<30 ns), and SOT23-6L space savings-making it optimal for cost- and size-constrained digital SMPS where drive asymmetry and logic flexibility are critical.
Availability
PM8851D is available at Aetrix Electronics and suitable for digitally controlled PFC boost converters, flyback adapters, LED lighting drivers, and wireless battery charger transmitters requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for PM8851D 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, sensors, and analog components for industrial, automotive, and consumer applications.
PM8851D belongs to ST's digital power interface product line, engineered specifically to bridge STLUX™ and STM32G0-series MCUs with discrete power switches in high-frequency, software-defined power conversion systems.
FAQ
What is the function of the IN_TH pin on PM8851D?
The IN_TH pin sets the input logic threshold voltage for the IN pin as a percentage of the applied voltage (2–5.5 V). For example, applying 3.3 V to IN_TH configures VIH ≈ 1.9 V and VIL ≈ 1.5 V, enabling direct compatibility with 3.3 V MCU I/Os without external level shifters or resistive dividers.
Can PM8851D drive both N-channel and P-channel MOSFETs?
PM8851D is designed exclusively as a low-side driver for N-channel MOSFETs. Its SRC and SNK outputs reference GND and cannot provide gate drive above VCC or below GND, making it unsuitable for high-side or P-channel configurations. It does not support bootstrap or floating supply operation.
How does the dual UVLO protection work in PM8851D?
PM8851D includes two independent UVLO circuits: one monitors VCC (turn-on threshold ≈ 10 V, hysteresis ≈ 1 V), and another monitors IN_TH (UVLO threshold ≈ 1.5 V). Both must exceed their thresholds before SRC/SNK outputs become active-preventing partial or undefined drive states during power-up or brown-out events.
Is a gate resistor required between PM8851D and the MOSFET gate?
Yes-a series gate resistor is recommended to dampen ringing and control dV/dt. The asymmetric drive strength allows different resistor values for SRC (e.g., 10 Ω for slower turn-on) and SNK (e.g., 4.7 Ω for faster turn-off), optimizing EMI and switching loss trade-offs per application requirements.
PM8851D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SOT-23-6
- 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-23-6
PM8851D FAQ
1.How can I place an order for PM8851D through Aetrix?
Please submit a Request for Quotation (RFQ) for PM8851D 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 PM8851D reliable?
The price and inventory of PM8851D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PM8851D is usually 5 days.
3.What payment methods are accepted for PM8851D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PM8851D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PM8851D?
PM8851D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PM8851D 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 PM8851D?
For technical support, including PM8851D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PM8851D requirements.
6.How does Aetrix verify that PM8851D is sourced from the original manufacturer or authorized distributors?
All PM8851D 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 PM8851D meets industry standards.
7.What is the process for return or replacement of PM8851D?
All PM8851D units undergo pre-shipment inspection (PSI). If there is an issue with PM8851D, 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 PM8851D part is unused and in its original packaging.
Return procedure for PM8851D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PM8851D Tags
-
ZXGD3009E6TA
Diodes Incorporated
-
1EDN7512BXTSA1
Infineon Technologies
-
UCC27517DBVR
Texas Instruments
-
MCP1416T-E/OT
Microchip Technology
-
MCP1402T-E/OT
Microchip Technology
-
MCP1415T-E/OT
Microchip Technology
-
MCP1401T-E/OT
Microchip Technology
-
IX4428NTR
Littelfuse Inc.
-
IRS2005STRPBF
Infineon Technologies
-
IRS2008STRPBF
Infineon Technologies
-
IX4310TTR
Littelfuse Inc.
-
2EDN7524RXTMA1
Infineon Technologies
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
