LMG1205 Datasheet, PDF (1/24 Pages) Texas Instruments – 100-V, 1.2-A, 5-A, Half-Bridge Gate Driver for Enhancement Mode GaN FETs

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LMG1205
SNOSD37 – MARCH 2017
LMG1205 100-V, 1.2-A, 5-A, Half-Bridge Gate Driver for Enhancement Mode GaN FETs
1 Features
•1 Independent High-Side and Low-Side
TTL Logic Inputs
• 1.2-A Peak Source, 5-A Sink Current
• High-Side Floating Bias Voltage Rail
Operates up to 100 VDC
• Internal Bootstrap Supply Voltage Clamping
• Split Outputs for Adjustable
Turnon, Turnoff Strength
• 0.6-Ω Pulldown, 2.1-Ω Pullup Resistance
• Fast Propagation Times (35 ns Typical)
• Excellent Propagation Delay Matching
(1.5 ns Typical)
• Supply Rail Undervoltage Lockout
• Low Power Consumption
2 Applications
• Current-Fed Push-Pull Converters
• Half and Full-Bridge Converters
• Synchronous Buck Converters
• Two-Switch Forward Converters
• Forward with Active Clamp Converters
3 Description
The LMG1205 is designed to drive both the high-side
and the low-side enhancement mode Gallium Nitride
(GaN) FETs in a synchronous buck, boost, or half-
bridge configuration. The device has an integrated
100-V bootstrap diode and independent inputs for the
high-side and low-side outputs for maximum control
flexibility. The high-side bias voltage is generated
using a bootstrap technique and is internally clamped
at 5 V, which prevents the gate voltage from
exceeding the maximum gate-source voltage rating of
enhancement mode GaN FETs. The inputs of the
LMG1205 are TTL logic compatible and can
withstand input voltages up to 14 V regardless of the
VDD voltage. The LMG1205 has split-gate outputs,
providing flexibility to adjust the turnon and turnoff
strength independently.
In addition, the strong sink capability of the LMG1205
maintains the gate in the low state, preventing
unintended turnon during switching. The LMG1205
can operate up to several MHz. The LMG1205 is
available in a 12-pin DSBGA package that offers a
compact footprint and minimized package inductance.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMG1205
DSBGA (12)
2.00 mm × 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Diagram
0.1 F
VIN
HB
HOH
VDD
1F
HI
HS
LMG1205
Load
LI
LOH
LOL
VSS
Copyright © 2017, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.