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FEATURES

DESCRIPTION

APPLICATIONS

TPS28225

SLUS710 – MAY 2006

High-Frequency 4-A Sink Synchronous MOSFET Driver

•

Drives Two N-Channel MOSFETs with 14-ns

The TPS28225 is a high-speed driver for N-channel

Adaptive Dead Time

complimentary driven power MOSFETs with adaptive

dead-time control. This driver is optimized for use in

•

Wide Gate Drive Voltage: 4.5V Up to 8.8V

variety of high-current one and multi-phase dc-to-dc

With Best Efficiency at 7V to 8V

converters. The TPS28225 is a solution that provides

•

Wide Power System Train Input Voltage: 3V

highly efficient, small size low EMI emmissions.

Up to 27V

The performance is achieved by up to 8.8-V gate

•

Wide Input PWM Signals: 2.0V up to 13.2-V

drive voltage, 14-ns adaptive dead-time control,

Amplitude

14-ns propagation delays and high-current 2-A

•

Capable Drive MOSFETs with

≥40-A Current

source and 4-A sink drive capability. The 0.4-

Ω

per Phase

impedance for the lower gate driver holds the gate of

power MOSFET below its threshold and ensures no

•

High Frequency Operation: 14ns Propagation

shoot-through current at high dV/dt phase node

Delay and 10ns Rise/Fall Time Allow Fsw -

transitions. The bootstrap capacitor charged by an

2MHz

internal diode allows use of N-channel MOSFETs in

•

Capable Propagate <30-ns Input PWM Pulses

half-bridge configuration.

•

Low-Side Driver Sink On-Resistance (0.4

Ω)

The TPS28225 features a 3-state PWM input

Prevents dV/dT Related Shoot-Through

compatible with all multi-phase controllers employing

Current

3-state output feature. As long as the input stays

•

3-State PWM Input for Power Stage Shutdown

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

mode

prevents

a

load

from

the

reversed-

(output) Signals on Same Pin

output-voltage.

•

Thermal Shutdown

The other features include under voltage lockout,

•

UVLO Protection

thermal shutdown and two-way enable/power good

•

Internal Bootstrap Diode

signal. Systems without 3-state featured controllers

can use enable/power good input/output to hold both

•

Economical SOIC-8 and Thermally Enhanced

outputs low during shutting down.

3-mm x 3-mm DFN-8 Packages

•

High Performance Replacement for Popular

The TPS28225 is offered in an economical SOIC-8

3-State Input Drivers

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.

•

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.

Copyright © 2006, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.