TPS28226
www.ti.com
SLUS791–OCTOBER 2007
High-Frequency 4-A Sink Synchronous MOSFET Drivers
1
FEATURES
DESCRIPTION
•
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.
•
•
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
•
•
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
•
•
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
•
•
•
•
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
•
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
1
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.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information current as of publication date.
Products conform to specifications per the terms of Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated
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