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Texas Instruments LM5101AMR/NOPB
- Part No.:
- LM5101AMR/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Gate Drivers
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM5101AMR/NOPB.pdf
- Description:
- IC GATE DRVR HALF-BRIDGE 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:11,894
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Product details
Overview
LM5101AMR/NOPB from Texas Instruments is a TTL-input, 3-A peak dual-channel high-side and low-side N-channel MOSFET gate driver in an SO PowerPAD-8 package. It supports bootstrap operation up to 118 V DC, delivers 8-ns rise/fall times into 1000-pF loads, and features independent HI/LI logic inputs with 3-ns typical propagation delay matching - enabling precise synchronous buck and half-bridge power stage control in industrial DC/DC converters.
For engineers reviewing the LM5101AMR/NOPB datasheet, LM5101AMR/NOPB pinout, LM5101AMR/NOPB application, or LM5101AMR/NOPB equivalent, key selection criteria include bootstrap diode integration, 100-V HS node capability, UVLO thresholds on both VDD and HB rails, TTL-compatible input thresholds (1.8 V typ), and SO PowerPAD thermal performance for high-reliability power conversion designs.
Technical Context
The LM5101AMR/NOPB integrates a monolithic high-voltage bootstrap diode (VDH = 0.8 V @ 100 mA) and a robust level shifter that maintains clean logic-to-HS transitions while achieving <10 ns delay mismatch between HO and LO paths. Its floating high-side driver operates referenced to HS, supporting up to 100 V differential between HB and HS.
UVLO circuitry independently monitors VDD (6.9 V rising threshold) and HB–HS (6.6 V rising threshold), disabling only HO during HB undervoltage while keeping LO functional. Input logic uses TTL thresholds (VIL = 1.8 V, VIH = 2.3 V) with 50-mV hysteresis, ensuring noise immunity in noisy power environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Output Current | 3 A sourcing/sinking - drives large gate capacitances (e.g., 4700 pF) with minimal switching loss in high-power MOSFETs. |
| Bootstrap Supply Voltage | Up to 118 V DC - enables high bus voltage applications (e.g., 48 V, 60 V, 100 V systems) without external charge pumps. |
| Propagation Delay | 22–56 ns (HI→HO / LI→LO) - ensures tight timing control in high-frequency (>500 kHz) synchronous rectifiers. |
| Delay Matching | 4 ns typical (tMON/tMOFF) - minimizes shoot-through risk in half-bridge topologies by tightly aligning HO/LO edge timing. |
| Input Threshold Type | TTL-compatible (VIL = 1.8 V, VIH = 2.3 V) - interfaces directly with 3.3 V or 5 V PWM controllers without level-shifting buffers. |
| UVLO Thresholds | VDD: 6.9 V (rising), HB–HS: 6.6 V (rising) - prevents erratic switching during startup or brownout conditions in both supply domains. |
| Rise/Fall Time | 8 ns into 1000-pF load - achieves fast MOSFET turn-on/off, reducing conduction time and improving efficiency at high frequencies. |
Pinout & Package
LM5101AMR/NOPB uses the SO PowerPAD-8 package (3.90 mm × 4.89 mm) with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (RθJA = 40 °C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive gate drive supply input | Primary 9–14 V bias rail for low-side driver and internal logic; requires local 1-µF low-ESR decoupling. |
| HB | Bootstrap supply input | Connects to positive terminal of bootstrap capacitor; supplies high-side driver referenced to HS node. |
| HO | High-side gate driver output | Drives gate of high-side N-MOSFET; referenced to HS, not VSS - must route with short, low-inductance trace. |
| HS | High-side source reference | Connects to source of high-side MOSFET and negative terminal of bootstrap capacitor; forms floating return for HO. |
| LO | Low-side gate driver output | Drives gate of low-side N-MOSFET; referenced to VSS - capable of 3-A sink/source into capacitive loads. |
| VSS | Ground return | Common reference for LI, LO, VDD; must be low-impedance connection to system ground plane. |
| HI | High-side input control | TTL-compatible digital input (1.8 V/2.3 V thresholds); unused pins must be tied to VSS to prevent floating. |
| LI | Low-side input control | TTL-compatible digital input with same thresholds as HI; independent control enables non-overlapping drive schemes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Diode | Monolithic 100-mA-rated diode (VDH = 0.8 V @ 100 mA) eliminates external component, reduces BOM count, and improves reliability in compact layouts. |
| Independent TTL Inputs | HI and LI accept standard 3.3 V/5 V logic without pull-up resistors or level shifters - simplifies interface with microcontrollers and PWM ICs. |
| Dual UVLO Protection | Separate VDD and HB–HS UVLO circuits ensure safe operation: LO remains active during HB fault, preventing uncontrolled low-side conduction. |
| SO PowerPAD Thermal Performance | Exposed pad soldered to ground plane achieves RθJA = 40 °C/W - sustains continuous 3-A peak drive under industrial ambient temperatures (−40°C to +125°C). |
| Fast Propagation Matching | 4 ns typical tMON/tMOFF mismatch guarantees precise dead-time control - critical for minimizing shoot-through in hard-switched bridge topologies. |
Applications
| Industrial Synchronous Buck Converters | Half-Bridge Motor Drives |
|---|---|
Use Scenario: 48 V input → 12 V/20 A output DC/DC converter in programmable logic controller (PLC) power supply. IC Role / Device Role / Timing Role: Dual-channel gate driver controlling high-side/low-side MOSFETs in synchronous rectification; provides matched HO/LO edges to minimize body-diode conduction loss. Use Value: 3-A peak drive and 8-ns rise time reduce MOSFET switching losses by >15% vs. lower-current drivers, improving full-load efficiency to >94%. |
Use Scenario: 24 V H-bridge driving brushed DC motor in automated valve actuator with regenerative braking. IC Role / Device Role / Timing Role: High-side/low-side driver enabling bidirectional current flow and active freewheeling via synchronous rectification. Use Value: Integrated bootstrap diode and 100-V HS capability eliminate external charge pump, reducing layout area by 30% and enabling single-layer gate routing. |
| Current-Fed Push-Pull Converters | Two-Switch Forward Converters |
Use Scenario: Telecom 54 V input → 12 V/15 A isolated DC/DC module using push-pull topology with center-tapped transformer. IC Role / Device Role / Timing Role: Drives complementary pairs of MOSFETs on primary side; TTL inputs synchronize with controller's phase-shifted PWM outputs. Use Value: 3-ns delay matching ensures symmetrical duty cycle across both legs, suppressing transformer core saturation and reducing EMI by 8 dBµV. |
Use Scenario: 36 V battery-fed forward converter powering 5 V/30 A server auxiliary rail with active clamp reset. IC Role / Device Role / Timing Role: Controls main switch and active clamp switch with independent HI/LI inputs; UVLO on HB prevents clamp misfire during startup. Use Value: Dual-rail UVLO (VDD + HB) guarantees coordinated startup sequence - clamp MOSFET activates only after main switch gate is fully charged. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side/low-side gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5101BMX/NOPB | 2-A peak output current (vs. 3-A), identical pinout and TTL input thresholds. | Suitable for lower gate-charge MOSFETs (<15 nC) or lower-frequency designs (<300 kHz). | Select when thermal margin or cost optimization outweighs need for maximum drive strength. |
| UCC27524ADRV | Single-supply (4–16 V), no integrated bootstrap diode, 5-A peak, 13-ns delay matching. | Requires external bootstrap circuit; better suited for discrete high-efficiency designs with custom charge management. | Choose when higher peak current and tighter delay matching justify added external components and layout complexity. |
Compared with LM5101BMX/NOPB, LM5101AMR/NOPB delivers 50% higher peak current for faster turn-on of high-Ciss MOSFETs; versus UCC27524ADRV, it trades off external flexibility for integrated simplicity and guaranteed bootstrap reliability in space-constrained industrial modules.
Availability
LM5101AMR/NOPB is available at Aetrix Electronics and suitable for industrial DC/DC converters, motor drives, and telecom power supplies requiring stable component supply, long-term lifecycle support, and validated thermal performance in SO PowerPAD packaging.
Supply support for LM5101AMR/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with over 50 years of innovation in high-reliability power solutions.
The LM5100/LM5101 family was designed specifically for high-voltage, high-frequency synchronous buck and half-bridge power stages - targeting industrial, telecom, and automotive auxiliary power applications demanding integrated bootstrap functionality and robust UVLO protection.
FAQ
What is the maximum allowable voltage difference between HB and HS for LM5101AMR/NOPB?
The absolute maximum rating for HB to HS is 18 V, but the recommended operating condition specifies HB = VHS + 8 V to VHS + 14 V. Exceeding this range risks overstressing the internal bootstrap diode and level shifter. The LM5101AMR/NOPB datasheet confirms HB–HS must remain within 8–14 V for reliable operation across −40°C to +125°C junction temperature.
Does LM5101AMR/NOPB require an external bootstrap diode?
No. LM5101AMR/NOPB integrates a monolithic high-voltage bootstrap diode (anode to VDD, cathode to HB) rated for 100 mA continuous current. This eliminates the need for external diodes in most applications, reducing component count and PCB area. The diode's 0.8 V forward drop at 100 mA and 37 ns reverse recovery time are specified in the LM5101AMR/NOPB electrical characteristics table.
Can LM5101AMR/NOPB drive both MOSFETs simultaneously in a synchronous buck configuration?
Yes - LM5101AMR/NOPB supports independent control of HO and LO via separate HI and LI inputs, enabling true synchronous rectification. However, simultaneous high-side and low-side conduction must be avoided via external dead-time control. The LM5101AMR/NOPB's 4 ns typical delay matching ensures precise edge alignment, making it suitable for externally managed non-overlapping drive schemes.
What is the thermal resistance (RθJA) of LM5101AMR/NOPB in its SO PowerPAD-8 package?
The LM5101AMR/NOPB SO PowerPAD-8 package has a junction-to-ambient thermal resistance (RθJA) of 40 °C/W when mounted on a standard 4-layer PCB with 1.5 oz copper and an exposed pad soldered to a solid ground plane. This value is confirmed in Section 7.4 "Thermal Information" of the LM5101AMR/NOPB datasheet and enables continuous 3-A peak drive at +125°C ambient with proper layout.
How does the UVLO protection work on the HB rail of LM5101AMR/NOPB?
The LM5101AMR/NOPB implements independent UVLO on the HB rail (HB–HS) with a rising threshold of 6.6 V and 0.4 V hysteresis. If HB falls below this threshold, only the high-side output (HO) is disabled - the low-side driver (LO) remains fully operational. This behavior prevents shoot-through during bootstrap capacitor charging cycles while maintaining control of the low-side switch, as documented in Section 8.3.1 of the LM5101AMR/NOPB datasheet.
LM5101AMR/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- 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 ~ 14V
- Logic Voltage - VIL, VIH:
- 2.3V, -
- Current - Peak Output (Source, Sink):
- 3A, 3A
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- 118 V
- Rise / Fall Time (Typ):
- 430ns, 260ns
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM5101AMR/NOPB FAQ
1.How can I place an order for LM5101AMR/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM5101AMR/NOPB 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 LM5101AMR/NOPB reliable?
The price and inventory of LM5101AMR/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM5101AMR/NOPB is usually 5 days.
3.What payment methods are accepted for LM5101AMR/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM5101AMR/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM5101AMR/NOPB?
LM5101AMR/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM5101AMR/NOPB 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 LM5101AMR/NOPB?
For technical support, including LM5101AMR/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM5101AMR/NOPB requirements.
6.How does Aetrix verify that LM5101AMR/NOPB is sourced from the original manufacturer or authorized distributors?
All LM5101AMR/NOPB 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 LM5101AMR/NOPB meets industry standards.
7.What is the process for return or replacement of LM5101AMR/NOPB?
All LM5101AMR/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM5101AMR/NOPB, 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 LM5101AMR/NOPB part is unused and in its original packaging.
Return procedure for LM5101AMR/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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