LM5113
www.ti.com
SNVS725E –JUNE 2011–REVISED JANUARY 2012
LM5113 5A, 100V Half-Bridge Gate Driver for Enhancement Mode GaN FETs
Check for Samples: LM5113
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FEATURES
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Excellent propagation delay matching (1.5ns
typical)
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Independent high-side and low-side TTL logic
inputs
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Supply rail under-voltage lockout
Low power consumption
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1.2A/5A peak source/sink current
High-side floating bias voltage rail operates up
to 100VDC
TYPICAL APPLICATIONS
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Current Fed Push-Pull converters
Half and Full-Bridge converters
Synchronous Buck converters
Two-switch Forward converters
Forward with Active Clamp converters
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Internal bootstrap supply voltage clamping
Split outputs for adjustable turn-on/turn-off
strength
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0.6Ω /2.1Ω pull-down/pull-up resistance
Fast propagation times (28ns typical)
DESCRIPTION
The LM5113 is designed to drive both the high-side and the low-side enhancement mode Gallium Nitride (GaN)
FETs in a synchronous buck or a half bridge configuration. The floating high-side driver is capable of driving a
high-side enhancement mode GaN FET operating up to 100V. The high-side bias voltage is generated using a
bootstrap technique and is internally clamped at 5.2V, which prevents the gate voltage from exceeding the
maximum gate-source voltage rating of enhancement mode GaN FETs. The inputs of the LM5113 are TTL logic
compatible, and can withstand input voltages up to 14V regardless of the VDD voltage. The LM5113 has split
gate outputs, providing flexibility to adjust the turn-on and turn-off strength independently.
In addition, the strong sink capability of the LM5113 maintains the gate in the low state, preventing unintended
turn-on during switching. The LM5113 can operate up to several MHz. The LM5113 is available in a standard
LLP-10 pin package and a 12-bump micro SMD package. The LLP-10 pin package contains an exposed pad to
aid power dissipation. The micro SMD package offers a compact footprint and minimized package inductance.
Packages
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LLP-10 (4 mm x 4 mm)
micro SMD (2 mm x 2 mm)
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