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SLUS710 – MAY 2006
High-Frequency 4-A Sink Synchronous MOSFET Driver
FEATURES
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Drives Two N-Channel MOSFETs with 14-ns
Adaptive Dead Time
Wide Gate Drive Voltage: 4.5V Up to 8.8V
With Best Efficiency at 7V to 8V
Wide Power System Train Input Voltage: 3V
Up to 27V
Wide Input PWM Signals: 2.0V up to 13.2-V
Amplitude
Capable Drive MOSFETs with
≥40-A
Current
per Phase
High Frequency Operation: 14ns Propagation
Delay and 10ns Rise/Fall Time Allow Fsw -
2MHz
Capable Propagate <30-ns Input PWM Pulses
Low-Side Driver Sink On-Resistance (0.4Ω)
Prevents dV/dT Related Shoot-Through
Current
3-State PWM Input for Power Stage Shutdown
Space Saving Enable (input) and Power Good
(output) Signals on Same Pin
Thermal Shutdown
UVLO Protection
Internal Bootstrap Diode
Economical SOIC-8 and Thermally Enhanced
3-mm x 3-mm DFN-8 Packages
High Performance Replacement for Popular
3-State Input Drivers
DESCRIPTION
The TPS28225 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 TPS28225 is a solution that provides
highly 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.
The TPS28225 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 a load from the reversed-
output-voltage.
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.
The TPS28225 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.
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APPLICATIONS
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Multi-Phase DC-to-DC Converters with
Analog or Digital Control
Desktop and Server VRMs and EVRDs
Portable/Notebook Regulators
Synchronous Rectification for Isolated Power
Supplies
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
