UCD7230 Datasheet, PDF (1/19 Pages) Texas Instruments – Digital Control Compatible Synchronous Buck ±4-A Drivers with Current Sense Conditioning Amplifier

UCD7230
www.ti.com
SLUS741 – NOVEMBER 2006
Digital Control Compatible Synchronous Buck ±4-A Drivers with Current Sense
Conditioning Amplifier
FEATURES
• Input from Digital Controller Sets Operating
Frequency and Duty Cycle
• Up to 2-MHz Switching Frequency
• Dual Current Limit Protection with
Independently Adjustable Thresholds
• Fast Current Sense Circuit with 25-ns
Propagation Delay and Adjustable Blanking
Interval Prevents Catastrophic Current Levels
• Digital Output Current Limit Flag
• Low Offset, Gain of 25, Differential Current
Sense Amplifier
• 3.3-V, 10-mA Internal Regulator
• Dual ±4-A TrueDrive™ High-Current Drivers
• 10-ns Typical Rise/Fall Times with 2.2-nF
Loads
• 25-ns Input-to-Output Propagation Delay
• 25-ns Current Sense-to-Output Propagation
Delay
• 4.5-V to 15.5-V Supply Voltage Range
APPLICATIONS
• Digitally-Controlled Synchronous-Buck Power
Stages for Single and Multi-Phase
Applications
• Especially Suited for Use with UCD91xx or
UCD95xx Contollers
• High-Current Multi-Phase VRM/EVRD
Regulators for Desktop, Server, Telecom and
Notebook Processors
• Digitally-Controlled Synchronous-Buck Power
Supplies Using µCs or the TMS320TM DSP
Family
DESCRIPTION
The UCD7230 is part of the UCD7K family of digital
control compatible drivers for applications utilizing
digital control techniques or applications requiring
fast local peak current limit protection.
V_IN
V_OUT
BIAS
I_MAX
CLF
VDD
CS
BIAS
CS+
BST
OUT1
SW PVDD OUT2 PGND
+
IO
UVLO
I_DLY
3V3
AGND
3V3
REG
Enable
Blank
DriveandDead-Time
ControlLogic
(D;1-D)
Over
Current
ILIM
Current
Limit Logic
CLF
UCD7230
25x
+ ^{0.6 V}
POS
NEG
ILIM/10
+
AO
IN
SRE
I_DLY
DLY
I_LOAD
PWM
SRE
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
TrueDrive, PowerPAD are trademarks of Texas Instruments.
PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2006, Texas Instruments Incorporated