TPS28226
www.ti.com
SLUS791–OCTOBER 2007
High-Frequency 4-A Sink Synchronous MOSFET Drivers
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FEATURES
DESCRIPTION
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Drives Two N-Channel MOSFETs with 14-ns
Adaptive Dead Time
The TPS28226 is a high-speed driver for N-channel
complimentary driven power MOSFETs with adaptive
dead-time control. This driver is optimized for use in
variety of high-current one and multi-phase dc-to-dc
converters. The TPS28226 is a solution that provides
highly efficient, small size low EMI emmissions.
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Gate Drive Voltage: 6.8 V Up to 8.8 V
Wide Power System Train Input Voltage: 3 V
Up to 27 V
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Wide Input PWM Signals: 2.0 V up to 13.2-V
Amplitude
The performance is achieved by up to 8.8-V gate
drive voltage, 14-ns adaptive dead-time control, 14-ns
propagation delays and high-current 2-A source and
4-A sink drive capability. The 0.4-Ω impedance for
the lower gate driver holds the gate of power
MOSFET below its threshold and ensures no
shoot-through current at high dV/dt phase node
transitions. The bootstrap capacitor charged by an
internal diode allows use of N-channel MOSFETs in
half-bridge configuration.
Capable Drive MOSFETs with ≥40-A Current
per Phase
High Frequency Operation: 14-ns Propagation
Delay and 10-ns Rise/Fall Time Allow FSW - 2
MHz
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Capable Propagate <30-ns Input PWM Pulses
Low-Side Driver Sink On-Resistance (0.4 Ω)
Prevents dV/dT Related Shoot-Through
Current
The TPS28226 features
a 3-state PWM input
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3-State PWM Input for Power Stage Shutdown
compatible with all multi-phase controllers employing
3-state output feature. As long as the input stays
within 3-state window for the 250-ns hold-off time, the
driver switches both outputs low. This shutdown
Space Saving Enable (input) and Power Good
(output) Signals on Same Pin
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Thermal Shutdown
UVLO Protection
mode prevents
output-voltage.
a
load from the reversed-
Internal Bootstrap Diode
The other features include under voltage lockout,
thermal shutdown and two-way enable/power good
signal. Systems without 3-state featured controllers
can use enable/power good input/output to hold both
outputs low during shutting down.
Economical SOIC-8 and Thermally Enhanced
3-mm x 3-mm DFN-8 Packages
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High Performance Replacement for Popular
3-State Input Drivers
The TPS28226 is offered in an economical SOIC-8
and thermally enhanced low-size Dual Flat No-Lead
(DFN-8) packages. The driver is specified in the
extended temperature range of –40°C to 125°C with
the absolute maximum junction temperature 150°C.
APPLICATIONS
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Multi-Phase DC-to-DC Converters with Analog
or Digital Control
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Desktop and Server VRMs and EVRDs
Portable/Notebook Regulators
Synchronous Rectification for Isolated Power
Supplies
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UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
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Copyright © 2007, Texas Instruments Incorporated