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TPS28225_15

更新时间： 2024-01-01 19:35:17
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德州仪器 - TI /
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30页 988K
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TPS28225 High-Frequency 4-A Sink Synchronous MOSFET Drivers

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TPS28225  
www.ti.com  
SLUS710–MAY 2006  
High-Frequency 4-A Sink Synchronous MOSFET Driver  
FEATURES  
DESCRIPTION  
•
•
•
•
•
•
Drives Two N-Channel MOSFETs with 14-ns  
Adaptive Dead Time  
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.  
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  
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.  
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  
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  
•
•
3-State PWM Input for Power Stage Shutdown  
Space Saving Enable (input) and Power Good  
(output) Signals on Same Pin  
mode prevents  
output-voltage.  
a
load from the reversed-  
•
•
•
•
Thermal Shutdown  
UVLO Protection  
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.  
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  
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.  
APPLICATIONS  
•
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  
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