TPS28225
TPS28226
www.ti.com
SLUS710C –MAY 2006–REVISED APRIL 2010
High-Frequency 4-A Sink Synchronous MOSFET Drivers
Check for Samples: TPS28225, TPS28226
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FEATURES
DESCRIPTION
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Drives Two N-Channel MOSFETs with 14-ns
Adaptive Dead Time
The TPS28225 and TPS28226 are high-speed
drivers for N-channel complimentary driven power
MOSFETs with adaptive dead-time control. These
drivers are optimized for use in variety of high-current
one and multi-phase dc-to-dc converters. The
Wide Gate Drive Voltage: 4.5 V Up to 8.8 V
With Best Efficiency at 7 V to 8 V
Wide Power System Train Input Voltage: 3 V
Up to 27 V
TPS28225/6 is
a solution that provides highly
Wide Input PWM Signals: 2.0 V up to 13.2-V
Amplitude
efficient, small size low EMI emmissions.
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 TPS28225/6 features a 3-state PWM input
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
mode prevents
output-voltage.
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3-State PWM Input for Power Stage Shutdown
Space Saving Enable (input) and Power Good
(output) Signals on Same Pin
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Thermal Shutdown
UVLO Protection
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 TPS28225/6 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.
The TPS28226 operates in the same manner as the
TPS28225/6 other than the input under voltage lock
out. Unless otherwise stated all references to the
TPS28225 apply to the TPS28226 also.
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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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
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