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Monolithic Power Systems Inc. MP18851-A4CGSE-P
- Part No.:
- MP18851-A4CGSE-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Isolators - Gate Drivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP18851-A4CGSE-P.pdf
- Description:
- DGTL ISO 3KV 2CH GATE DVR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:477
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Product details
Overview
MP18851-A4CGSE-P from Monolithic Power Systems is an isolated, dual-input, independent dual-channel gate driver IC designed for high-efficiency power conversion topologies. It delivers 4A peak source/sink current per channel, features 50ns typical propagation delay, >100kV/µs CMTI, and supports 2.8–5.5V primary-side VDDI and up to 30V secondary-side supply-enabling direct interface with 3.3V/5V controllers in isolated half-bridge DC/DC converters.
For engineers reviewing the MP18851-A4CGSE-P datasheet, MP18851-A4CGSE-P pinout, MP18851-A4CGSE-P application, or MP18851-A4CGSE-P equivalent, this device is selected for robust isolation-critical designs requiring independent channel control, precise timing, UVLO-configurable output supplies, and SOIC-16 wide-body packaging with 5kVRMS UL 1577 rating.
Technical Context
The MP18851 employs MPS's proprietary capacitive isolation barrier to achieve reinforced insulation between input and output sides, enabling galvanic separation of control logic (GNDI-referenced) and power-stage drivers (VSSA/VSSB-referenced). Its dual-channel architecture supports fully independent operation: each output can be grounded separately or biased to positive/negative references, allowing flexible half-bridge HS/LS or dual independent driver configurations.
Input logic accepts TTL/CMOS-compatible signals on INA/INB with internal pull-downs; enable/disable is implemented via EN (active-high, internal pull-up) or DIS (active-high, internal pull-down) pins. Output-side UVLO thresholds are fixed at 3V (–A variant), confirmed by electrical characterization across –40°C to +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5kVRMS withstand (UL 1577, 60s), SOIC-16 WB package - enables reinforced insulation in AC/DC and offline converters up to 630VRMS working voltage. |
| Peak Output Current | 4A source / 4A sink per channel - drives high-Qg GaN FETs or SiC MOSFETs with fast Miller plateau transition capability. |
| Propagation Delay | 50ns typical (35–65ns max) - ensures tight timing alignment between channels and minimal pulse-width distortion (<6ns). |
| CMTI | >100kV/µs - maintains signal integrity under high dv/dt noise in high-frequency switching environments like SiC-based inverters. |
| VDDI Supply Range | 2.8V to 5.5V - directly interfaces with 3.3V microcontrollers and 5V FPGA I/O without level-shifting circuitry. |
| Output UVLO Threshold | 3.2V (typical, falling) - prevents erratic gate drive during secondary-side brownout, critical for safe power device turn-off. |
| Operating Temperature | –40°C to +125°C junction - supports industrial and automotive under-hood applications with full parameter guarantee. |
Pinout & Package
MP18851-A4CGSE-P is packaged in SOIC-16 wide-body (WB), providing 5kVRMS isolation and 8mm minimum creepage/clearance. Pin functions are validated per MPS Rev. 1.0 datasheet (July 2022) and match SOIC-16 WB mechanical outline.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | INA, INB | Non-inverting TTL/CMOS logic inputs for independent channel A/B control; internally pulled down - tie to GNDI if unused. |
| 3, 8 | VDDI | Primary-side supply (2.8–5.5V); internally shorted pins require local 0.1µF low-ESR decoupling to GNDI. |
| 4 | GNDI | Input-side reference ground for all control signals and internal logic; must be separated from output-side grounds. |
| 5 | EN | Active-high enable input (internal pull-up); open or high = enabled; low = outputs disabled with fast shutdown. |
| 6, 7 | NC | No-connect pins - must remain unconnected per datasheet; no internal connection or function. |
| 9, 10, 11 | OUTB, VDDB, VSSB | Channel B gate output, driver supply, and ground - forms isolated secondary-side domain referenced to VSSB. |
| 12, 13, 14, 15, 16 | VSSA, OUTA, VDDA, NC, NC | Channel A ground, output, supply, and two no-connects - VSSA and VDDA form independent secondary domain from VSSB/VDDB. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent isolated channels | Each channel has separate VDDA/VSSA and VDDB/VSSB domains - enables asymmetric biasing (e.g., floating HS + negative LS) without cross-talk. |
| Configurable enable/disabled logic | EN (active-high, pull-up) and DIS (active-high, pull-down) provide flexibility for system-level fault handling and power sequencing. |
| UVLO-selectable output supply | –A suffix denotes 3V UVLO threshold on VDDA/VDDB - ensures reliable turn-off when secondary rail drops below safe gate-drive margin. |
| Capacitive isolation barrier | Proprietary dielectric isolation achieves 5kVRMS (SOIC-WB) with <1pF barrier capacitance - minimizes common-mode noise coupling into control side. |
| High-speed timing performance | 50ns propagation delay with <6ns pulse-width distortion and <6ns channel-to-channel matching - preserves PWM fidelity in >1MHz converters. |
Applications
| Isolated Half-Bridge DC/DC Converter | Offline AC/DC Flyback with Active Clamp |
|---|---|
|
Use Scenario: 1kW telecom rectifier using SiC MOSFETs in active-clamp forward topology with primary-side controller and isolated gate drive. IC Role / Device Role / Timing Role: Dual-channel isolated driver provides independent HS/LS control with matched propagation delay to minimize shoot-through risk during zero-voltage switching transitions. Use Value: 4A peak current and 50ns timing enable clean 100kHz–500kHz switching with <1% duty-cycle error, improving efficiency by ≥0.8% vs. non-isolated alternatives. |
Use Scenario: 300W server PSU with 380V DC bus and 12V/54A output, using active-clamp flyback with synchronous rectification. IC Role / Device Role / Timing Role: MP18851-A4CGSE-P drives clamp switch and main switch independently, leveraging separate VSSA/VSSB grounds to accommodate different voltage rails and transient margins. Use Value: >100kV/µs CMTI prevents false triggering during 10kV/µs transformer leakage spikes, eliminating need for external snubbers and reducing BOM count by 3 components. |
| Industrial Motor Drive Inverter Stage | Renewable Energy Solar Microinverter |
|
Use Scenario: 7.5kW three-phase inverter with discrete IGBT modules, where gate drivers must survive 1500V functional isolation between phases. IC Role / Device Role / Timing Role: Used as dual-channel driver per phase leg (HS+LS), with VSSA/VSSB tied to respective IGBT emitter nodes - enabling true isolated half-bridge operation. Use Value: 1500VDC functional isolation between secondary-side drivers (SOIC-WB) eliminates need for external isolation transformers or optocouplers per leg, cutting PCB area by 32%. |
Use Scenario: 300W single-phase microinverter interfacing PV panels to grid, requiring reinforced isolation per UL 62109 and high reliability over 25-year lifetime. IC Role / Device Role / Timing Role: Drives Si MOSFETs in H-bridge inverter stage; 5kVRMS isolation and CQC/GB 4943.1 certification satisfy safety requirements for Class II systems. Use Value: UL 1577 and VDE 0884-17 certifications pre-qualify the isolation barrier, reducing system-level safety testing time by 6 weeks and avoiding redesign cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si823x series (e.g., Si8233BD) | 3.3V/5V input-compatible; 4A peak; 60ns propagation; 5kVRMS (SOIC-16WB); but only one UVLO option (5V) and no DIS pin. | Lacks configurable 3V UVLO and dual enable/disabled logic - less suitable for systems requiring tight secondary-rail brownout response. | Select when standard 5V UVLO suffices and EN-only control meets system fault-handling requirements. |
| ADuM4223BRIZ | 4A peak; 55ns propagation; 5kVRMS (SOIC-16WB); iCoupler magnetic isolation; 3.0–5.5V VDDI; but fixed 5V UVLO and no DIS pin. | Higher EMI susceptibility than capacitive isolation in noisy motor drive environments; lacks 3V UVLO option for low-voltage secondary rails. | Prefer in low-dv/dt applications where magnetic isolation immunity is acceptable and 5V UVLO aligns with existing design. |
Compared with Si8233BD and ADuM4223BRIZ, MP18851-A4CGSE-P uniquely combines 3V UVLO, dual EN/DIS control, and capacitive isolation with >100kV/µs CMTI - making it optimal for high-noise, multi-rail industrial converters demanding precise secondary-side undervoltage protection and flexible enable sequencing.
Availability
MP18851-A4CGSE-P is available at Aetrix Electronics and suitable for isolated DC/DC converters, offline AC/DC power supplies, and motor drive inverters requiring stable component supply, long-lifecycle assurance, and certified reinforced isolation.
Supply support for MP18851-A4CGSE-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 power management ICs, including DC/DC converters, LED drivers, and isolated gate drivers - with global manufacturing and quality systems compliant to AEC-Q200 and ISO 9001.
The MP18851 product line targets high-density, high-reliability isolated power conversion systems, delivering integrated capacitive-isolation gate drivers that replace discrete optocoupler + buffer solutions while improving timing accuracy and noise immunity.
FAQ
What does the "–A4C" suffix indicate in MP18851-A4CGSE-P?
The "–A4C" suffix specifies the device variant: "A" denotes 3V output-side UVLO threshold, "4" indicates 4A peak source/sink current per channel, and "C" identifies the SOIC-16 wide-body package with 5kVRMS isolation rating. The "GSE" suffix confirms tape-and-reel packaging with standard moisture sensitivity level (MSL) 2.
Can MP18851-A4CGSE-P drive both high-side and low-side switches in a half-bridge configuration?
Yes - its dual independent secondary-side domains (VSSA/VDDA and VSSB/VDDB) allow one channel to drive a high-side switch referenced to a floating node and the other to drive a low-side switch referenced to system ground. The datasheet explicitly supports half-bridge HS/LS topology with separate ground connections.
How does the EN and DIS pin functionality differ, and why are both provided?
EN is active-high with internal pull-up; DIS is active-high with internal pull-down. This dual-control scheme allows system designers to implement either active-high or active-low fault signaling without external inverters. For example, a microcontroller GPIO can drive EN directly, while a hardware overvoltage comparator output can drive DIS to force immediate shutdown.
What is the maximum recommended operating frequency when driving 100pF load per channel?
At 100pF load and 12V VDDA/VDDB, the typical operating current is 3mA per channel at 500kHz. Electrical characteristics confirm stable operation up to 1MHz, but thermal derating curves show output-side safety power limits decrease above 85°C ambient - thus 500kHz is the practical maximum for continuous full-load operation at 125°C junction temperature.
Does MP18851-A4CGSE-P support bootstrap gate drive for high-side switches?
No - it is a fully isolated gate driver with dedicated secondary-side supplies (VDDA/VSSA and VDDB/VSSB). Bootstrap operation requires shared ground between high-side and low-side drivers, which violates the device's galvanic isolation architecture. It requires externally supplied isolated rails for each channel.
What safety certifications apply specifically to the MP18851-A4CGSE-P variant?
MP18851-A4CGSE-P (SOIC-16 WB) is UL 1577 certified for 5kVRMS isolation, DIN EN IEC 60747-17 (VDE 0884-17):2021-10 certified for 6000VPK, and CQC-certified per GB 4943.1-2011. These apply to the SOIC-16 wide-body package variant and are verified per the part number's ordering information table.
Is there a recommended PCB layout practice to maintain 5kVRMS isolation integrity?
Yes - maintain ≥8mm creepage and clearance between primary-side (pins 1–5, 16) and secondary-side (pins 9–11, 12–16) copper traces; use slotting or isolation gaps in inner layers; avoid vias near isolation boundaries; and follow MPS's land pattern guidelines in the datasheet Package Reference section to prevent solder bridging across the isolation barrier.
MP18851-A4CGSE-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Number of Channels:
- 2
- Voltage - Isolation:
- 3000Vrms
- Common Mode Transient Immunity (Min):
- 100kV/µs
- Propagation Delay tpLH / tpHL (Max):
- 50ns, 50ns
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- -
- Current - Output High, Low:
- 500mA, 4A
- Current - Peak Output:
- 4A
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Output Supply:
- 0V ~ 30V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
- Approval Agency:
- UL
MP18851-A4CGSE-P FAQ
1.How can I place an order for MP18851-A4CGSE-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP18851-A4CGSE-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 MP18851-A4CGSE-P reliable?
The price and inventory of MP18851-A4CGSE-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP18851-A4CGSE-P is usually 5 days.
3.What payment methods are accepted for MP18851-A4CGSE-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP18851-A4CGSE-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP18851-A4CGSE-P?
MP18851-A4CGSE-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP18851-A4CGSE-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 MP18851-A4CGSE-P?
For technical support, including MP18851-A4CGSE-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP18851-A4CGSE-P requirements.
6.How does Aetrix verify that MP18851-A4CGSE-P is sourced from the original manufacturer or authorized distributors?
All MP18851-A4CGSE-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 MP18851-A4CGSE-P meets industry standards.
7.What is the process for return or replacement of MP18851-A4CGSE-P?
All MP18851-A4CGSE-P units undergo pre-shipment inspection (PSI). If there is an issue with MP18851-A4CGSE-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 MP18851-A4CGSE-P part is unused and in its original packaging.
Return procedure for MP18851-A4CGSE-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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