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Monolithic Power Systems Inc. MP18021HN-LF
- Part No.:
- MP18021HN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Gate Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP18021HN-LF.pdf
- Description:
- IC GATE DRVR HALF-BRIDGE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,033
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Product details
Overview
MP18021HN-LF from Monolithic Power Systems is a 100V high-frequency half-bridge N-channel MOSFET gate driver in SOIC8 EPAD package, featuring independently controlled high-side and low-side channels with <5ns propagation delay matching, 16ns typical propagation delay, and integrated bootstrap diode. It drives telecom half-bridge power supplies and avionics DC-DC converters requiring precise timing and high-voltage robustness.
For engineers reviewing the MP18021HN-LF datasheet, MP18021HN-LF pinout, MP18021HN-LF application, or MP18021HN-LF equivalent, key selection criteria include bootstrap voltage range (100V), UVLO thresholds (7.7–8.5V on VDD, 6.7–7.5V on BST–SW), 1nF load drive capability (12ns/9ns rise/fall), TTL-compatible inputs, and thermal performance (θJA = 48°C/W).
Technical Context
The MP18021HN-LF implements dual-channel level-shifted gate driving with independent INH and INL control inputs, enabling asynchronous high-side and low-side switching. Its internal floating driver uses charge-pump-based bootstrap operation with an integrated diode, eliminating external diode requirements while supporting up to 100V BST–SW differential voltage.
Under-voltage lockout circuits monitor both VDD and BST–SW rails independently, forcing DRVH and DRVL low upon undervoltage detection. Propagation delay matching (<5ns) and tight rise/fall time consistency (12ns/9ns into 1nF at 12V) support >1MHz switching in two-switch forward and active-clamp forward topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBST Range | –0.3V to +100V: Enables high-side operation with 100V bridge node swing without external bootstrap diode. |
| Propagation Delay | 16ns typ.: Ensures minimal timing skew between PWM input and gate output for stable high-frequency operation. |
| Delay Matching | <5ns: Guarantees synchronous turn-on/turn-off of high-side and low-side FETs to prevent shoot-through. |
| Rise/Fall Time | 12ns/9ns into 1nF @ 12V: Supports fast switching of medium-size MOSFETs in telecom and avionics SMPS. |
| UVLO Thresholds | VDDR = 7.7–8.5V, VBSTR = 6.7–7.5V: Prevents erratic gate drive during brown-out conditions on either supply rail. |
| IDDQ | 150µA max: Minimizes standby power loss in always-on industrial power modules. |
| Thermal Resistance | θJA = 48°C/W: Allows 2.6W continuous dissipation at +25°C ambient in SOIC8 EPAD package. |
Pinout & Package
MP18021HN-LF is housed in an SOIC8 package with exposed thermal pad (JEDEC MS-012 BA), optimized for PCB heat dissipation. The exposed pad must be soldered to a grounded copper area for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Main supply input | Power source for internal logic and low-side driver; requires local 0.1µF ceramic decoupling to VSS. |
| 2 BST | Bootstrap supply | Positive rail for high-side driver; connects via capacitor to SW to generate floating bias above switching node. |
| 3 DRVH | Floating high-side gate output | Drives gate of N-channel high-side MOSFET referenced to SW node; capable of 1.5A peak pull-up at 12V. |
| 4 SW | Switching node | Connection point between high-side and low-side MOSFETs; referenced for BST capacitor and level-shifter return. |
| 5 INH | High-side enable input | TTL-compatible control signal (2.4V high threshold); independent of INL for asymmetric drive timing. |
| 6 INL | Low-side enable input | TTL-compatible control signal; direct drive path to DRVL with matched delay to INH→DRVH path. |
| 7 VSS / Exposed Pad | Ground reference & thermal path | Common return for all circuitry; exposed pad must be soldered to PCB ground plane for thermal management. |
| 8 DRVL | Low-side gate output | Drives gate of N-channel low-side MOSFET referenced to VSS; delivers 2.5A peak pull-down at 12V. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diode | Reduces BOM count by eliminating external diode; VF = 0.5V @ 100µA, RD = 2.5Ω @ 100mA. |
| Independent channel control | INH and INL allow non-overlapping or complementary drive schemes without external logic. |
| Matched propagation delay | <5ns difference between high-side and low-side paths ensures precise dead-time management. |
| UVLO on both supplies | Separate VDD and BST–SW monitoring prevents partial drive during supply sag or bootstrap depletion. |
| High-speed 1nF loading | 12ns rise / 9ns fall times at 12V enable efficient driving of MOSFETs with Qg ≈ 12nC. |
Applications
| Telecom Half-Bridge Power Supplies | Avionics DC-DC Converters |
|---|---|
|
Use Scenario: 48V input telecom rectifier with 12V/20A isolated output using half-bridge topology. IC Role / Device Role / Timing Role: Gate driver for primary-side N-channel MOSFET pair; provides matched timing and bootstrap bias for high-side switch. Use Value: 100V VBST rating supports wide input transients; <5ns matching minimizes conduction overlap losses at 500kHz. |
Use Scenario: MIL-STD-704 compliant 270V DC-DC converter for airborne radar power systems. IC Role / Device Role / Timing Role: High-reliability gate driver controlling SiC MOSFETs in two-switch forward configuration. Use Value: –40°C to +125°C operating range and UVLO hysteresis ensure startup stability under cold cranking and thermal cycling. |
| Two-Switch Forward Converters | Active Clamp Forward Converters |
|
Use Scenario: Industrial 380V AC/DC front-end with two-switch forward stage delivering 48V@15A. IC Role / Device Role / Timing Role: Synchronized gate driver for primary switches; enables zero-voltage switching via precise dead-time control. Use Value: 16ns propagation delay and 12ns rise time support ZVS implementation up to 300kHz with minimal timing margin. |
Use Scenario: High-efficiency server PSU using active clamp forward topology with 54V input and 12V/100A output. IC Role / Device Role / Timing Role: Dual-channel driver managing main switches and active clamp switch with independent INH/INL control. Use Value: Independent inputs allow staggered turn-on of clamp switch; integrated bootstrap diode simplifies layout in compact 1U form factor. |
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 VBS rating (600V), no integrated bootstrap diode, SOIC8 package, 60ns propagation delay. | Targeted at higher-voltage industrial motor drives; requires external bootstrap diode and larger timing margins. | Select when >100V bridge voltage or higher dV/dt immunity is required; avoid if minimizing BOM count is critical. |
| LM5109BMAX/NOPB | 100V VBS, no integrated bootstrap diode, 55ns propagation delay, QFN20 package, higher quiescent current (2mA). | Optimized for high-current automotive DC-DC; lacks independent INH/INL control (uses single input with internal logic). | Select for automotive AEC-Q100 compliance needs; avoid when independent high/low-side timing control is mandatory. |
Compared with IRS21844SPbF and LM5109BMAX/NOPB, MP18021HN-LF offers superior timing precision (<5ns matching vs. >20ns typical), lower propagation delay (16ns vs. ≥55ns), integrated bootstrap diode, and independent control-making it optimal for high-frequency telecom and avionics SMPS where layout simplicity and timing fidelity are critical.
Availability
MP18021HN-LF is available at Aetrix Electronics and suitable for telecom half-bridge power supplies, avionics DC-DC converters, and two-switch forward converters requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.
Supply support for MP18021HN-LF 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 across Asia and North America and global manufacturing partnerships.
The MP18021 belongs to MPS's high-frequency gate driver product line, engineered specifically for isolated DC-DC and telecom power conversion systems demanding precision timing, high-voltage tolerance, and minimal external components.
FAQ
What is the maximum allowable VSW voltage for MP18021HN-LF?
The absolute maximum VSW rating is –5.0V to +100V relative to VSS. This allows operation with high-side FETs switching up to 100V, provided VBST–VSW remains within –0.3V to +18V and VDD stays between –0.3V and +18V per the datasheet's Absolute Maximum Ratings table.
Does MP18021HN-LF require an external bootstrap diode?
No. MP18021HN-LF integrates a bootstrap diode with forward voltage of 0.5V at 100µA and dynamic resistance of 2.5Ω at 100mA. This eliminates the need for an external diode, reducing component count and PCB footprint in space-constrained designs.
How does the UVLO function on the BST–SW rail?
The BST–SW UVLO triggers when the voltage difference falls below 6.7V (typical), forcing DRVH low. Hysteresis is 0.55V, so recovery occurs at ~7.25V. This protects against high-side driver malfunction during bootstrap capacitor discharge or slow-start conditions.
Can MP18021HN-LF drive SiC MOSFETs?
Yes-its 1.5A peak pull-up and 2.5A peak pull-down currents, 12ns/9ns rise/fall times into 1nF, and 100V VBST rating support common 650V SiC MOSFETs with gate charge ≤15nC, provided gate resistor values are selected to limit dV/dt-induced ringing.
What is the thermal pad connection requirement for SOIC8 EPAD?
The exposed pad (Pin 7) must be soldered directly to a solid PCB copper pour tied to VSS. Per JEDEC MS-012 BA, this pad serves as both thermal path and electrical ground; omitting it degrades θJA by >20°C/W and risks thermal shutdown above 1.2W dissipation.
Is MP18021HN-LF pin-compatible with MP18021HQ?
No. MP18021HN-LF uses SOIC8 EPAD (8-pin, 0.150" width), while MP18021HQ uses 3×3mm QFN8. Pin numbering and thermal pad layout differ; PCB layout and land pattern are not interchangeable despite identical pin functions.
MP18021HN-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- Half-Bridge
- Channel Type:
- Independent
- Number of Drivers:
- 2
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 9V ~ 16V
- Logic Voltage - VIL, VIH:
- 1V, 2.4V
- Current - Peak Output (Source, Sink):
- 2.5A, 2.5A
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- 100 V
- Rise / Fall Time (Typ):
- 12ns, 9ns
- Operating Temperature:
- -40°C ~ 140°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP18021HN-LF FAQ
1.How can I place an order for MP18021HN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP18021HN-LF 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 MP18021HN-LF reliable?
The price and inventory of MP18021HN-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP18021HN-LF is usually 5 days.
3.What payment methods are accepted for MP18021HN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP18021HN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP18021HN-LF?
MP18021HN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP18021HN-LF 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 MP18021HN-LF?
For technical support, including MP18021HN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP18021HN-LF requirements.
6.How does Aetrix verify that MP18021HN-LF is sourced from the original manufacturer or authorized distributors?
All MP18021HN-LF 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 MP18021HN-LF meets industry standards.
7.What is the process for return or replacement of MP18021HN-LF?
All MP18021HN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP18021HN-LF, 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 MP18021HN-LF part is unused and in its original packaging.
Return procedure for MP18021HN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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