UCD7100_12 Datasheet, PDF (1/26 Pages) Texas Instruments – Digital Control Compatible Single Low-Side ±4-A MOSFET Driver with Current Sense

UCD7100
www.ti.com
SLUS651C – MARCH 2005 – REVISED MAY 2010
Digital Control Compatible Single Low-Side ±4-A MOSFET Driver with Current Sense
Check for Samples: UCD7100
FEATURES
1
•2 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
APPLICATIONS
• Digitally Controlled Power Supplies
• DC/DC Converters
• Motor Controllers
• Line Drivers
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.
TYPICAL APPLICATION DIAGRAMS
VIN
VOUT
Digital Controller
AN1
VDD
PWMA
AGND
INT
PWMB
UCD7100PWP
3 3V3
VDD 14
2 ^IN
5 CLF
6 ILIM
4 AGND
OUT 12
CS 8
Bias
Winding
Communication
AN2
AN3
2
Isolation
Amplifier
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.
TrueDrive, PowerPAD are trademarks of Texas Instruments.
2
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 © 2005–2010, Texas Instruments Incorporated