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SLUS651C – MARCH 2005 – REVISED MAY 2010
Digital Control Compatible Single Low-Side ±4-A MOSFET Driver with Current Sense
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FEATURES
Adjustable Current Limit Protection
3.3-V, 10-mA Internal Regulator
DSP/µC Compatible Inputs
Single ±4-A TrueDrive™ High Current Driver
10-ns Typical Rise and Fall Times with 2.2-nF
Loads
25-ns Input-to-Output Propagation Delay
25-ns Current Sense to Output Delay
Programmable Current Limit Threshold
Digital Output Current Limit Flag
4.5-V to 15-V Supply Voltage Range
Rated from -40°C to 105°C
Lead(Pb)-Free Packaging
DESCRIPTION
The UCD7100 is a member of the UCD7K family of
digital control compatible drivers for applications
utilizing digital control techniques or applications
requiring fast local peak current limit protection.
The UCD7100 is a low-side ±4-A high-current
MOSFET gate driver. It allows the digital power
controllers such as UCD9110 or UCD9501 to
interface to the power stage in single ended
topologies. It provides a cycle-by-cycle current limit
function with programmable threshold and a digital
output current limit flag which can be monitored by
the host controller. With a fast 25-ns cycle-by-cycle
current limit protection, the driver can turn off the
power stage in the unlikely event that the digital
system can not respond to a failure situation in time.
For fast switching speeds, the UCD7100 output stage
uses the TrueDrive™ output architecture, which
delivers rated current of ±4 A into the gate of a
MOSFET during the Miller plateau region of the
switching transition. It also includes a 3.3-V, 10-mA
linear regulator to provide power to the digital
controller.
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APPLICATIONS
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Digitally Controlled Power Supplies
DC/DC Converters
Motor Controllers
Line Drivers
TYPICAL APPLICATION DIAGRAMS
VIN
VOUT
Bias
Winding
Digital Controller
AN1
VDD
PWMA
AGND
INT
PWMB
3
2
5
UCD7100PWP
3V3
IN
CLF
OUT 12
VDD 14
6 ILIM
CS 8
4 AGND
Communication
AN2
AN3
Isolation
Amplifier
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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.
TrueDrive, PowerPAD are trademarks of Texas Instruments.
Copyright © 2005–2010, Texas Instruments Incorporated
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.
TI [ TEXAS INSTRUMENTS ]
