Overview
The LM5113SDE/NOPB, manufactured by Texas Instruments, is a 1.2-A/5-A, 90-V half-bridge gate driver specifically designed to drive both the high-side and low-side enhancement mode Gallium Nitride (GaN) FETs. This device is suitable for synchronous buck or half-bridge configurations. The LM5113 features independent high-side and low-side TTL logic inputs, which can withstand input voltages up to 14 V regardless of the VDD voltage. The high-side driver operates using a bootstrap technique with the bias voltage internally clamped at 5.2 V to prevent exceeding the maximum gate-source voltage rating of the GaN FETs.
Key Specifications
| Parameter | Value | Description |
|---|---|---|
| Peak Source/Sink Current | 1.2 A / 5 A | Maximum current the driver can source or sink |
| High-Side Floating Bias Voltage Rail | Up to 100 VDC | Maximum voltage the high-side driver can operate at |
| Internal Bootstrap Supply Voltage Clamping | 5.2 V typical | Clamping voltage to prevent gate voltage from exceeding the maximum gate-source voltage rating |
| Pull-down/Pull-up Resistance | 0.6 Ω / 2.1 Ω | Resistance values for turn-off and turn-on paths |
| Propagation Times | 28 ns typical | Time for the signal to propagate through the driver |
| Propagation Delay Matching | 1.5 ns typical | Difference in propagation times between high-side and low-side drivers |
| Supply Rail Undervoltage Lockout (UVLO) | 3.8 V (VDD), 3.2 V (Bootstrap) | Voltage thresholds below which the driver is disabled |
| Package Options | WSON-10, DSBGA-12 | Available package types for the LM5113 |
Key Features
- Independent High-Side and Low-Side TTL Logic Inputs: Inputs can withstand voltages up to 14 V regardless of the VDD voltage.
- Split Gate Outputs: Allows for adjustable turn-on and turn-off strength independently.
- Internal Bootstrap Supply Voltage Clamping: Prevents the gate voltage from exceeding the maximum gate-source voltage rating of GaN FETs.
- Fast Propagation Times and Excellent Propagation Delay Matching: Ensures high-frequency operation with minimal delay mismatch.
- Supply Rail Undervoltage Lockout (UVLO): Prevents partial turn-on of GaN FETs when the supply voltage is below the threshold.
- Low Power Consumption: Optimized for efficient operation.
- Compact Packaging Options: Available in WSON-10 and DSBGA-12 packages, aiding in power dissipation and minimizing package inductance.
Applications
- Merchant Telecom Rectifiers: Used in high-efficiency power conversion systems.
- Merchant DC/DC Converters: Suitable for high-frequency switching applications.
- Closed Loop Stepper Motor Drive: Enhances motor control precision and efficiency.
- Baseband Unit (BBU) and Macro Remote Radio Unit (RRU): Used in telecommunications infrastructure for high-power conversion needs.
Q & A
- What is the maximum voltage the LM5113 can operate at?
The LM5113 can operate up to 100 VDC on the high-side floating bias voltage rail.
- What is the purpose of the internal bootstrap supply voltage clamping?
The internal clamping prevents the gate voltage from exceeding the maximum gate-source voltage rating of the GaN FETs, typically clamped at 5.2 V.
- What are the pull-down and pull-up resistance values of the LM5113?
The pull-down resistance is 0.6 Ω, and the pull-up resistance is 2.1 Ω.
- What is the propagation delay matching of the LM5113?
The propagation delay matching is typically 1.5 ns.
- What are the package options available for the LM5113?
The LM5113 is available in WSON-10 and DSBGA-12 packages.
- Can the LM5113 operate at high frequencies?
- What is the purpose of the supply rail undervoltage lockout (UVLO)?
The UVLO prevents the GaN FETs from being partially turned on when the supply voltage is below the threshold (3.8 V for VDD and 3.2 V for bootstrap).
- How do the split gate outputs of the LM5113 benefit its operation?
The split gate outputs allow for adjustable turn-on and turn-off strength independently, providing flexibility in switching speed adjustment.
- What types of applications is the LM5113 suitable for?
The LM5113 is suitable for applications such as merchant telecom rectifiers, DC/DC converters, closed loop stepper motor drives, and telecommunications infrastructure like BBU and RRU.
- How does the LM5113 handle power dissipation?
The WSON-10 package includes an exposed pad to aid power dissipation, and the DSBGA package offers a compact footprint with minimized package inductance.
