UCD7230A Datasheet, PDF (1/25 Pages) Texas Instruments – Digital Control Compatible Synchronous Buck Gate Driver with Current Sense Conditioning Amplifier

UCD7230A
www.ti.com
SLUS995 – NOVEMBER 2009
Digital Control Compatible Synchronous Buck Gate Driver
with Current Sense Conditioning Amplifier
Check for Samples: UCD7230A
FEATURES
1
•2 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 Adjustable
Blanking Interval Prevents Catastrophic
Current Levels
• Digital Output Current Limit Flag
• Low Offset, Gain of 48, Differential Current
Sense Amplifier
• 3.3-V, 10-mA Internal Regulator
• Dual TrueDrive™ High-Current Drivers
• 10-ns Typical Rise/Fall Times with 2.2-nF
Loads
• 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
UCD92xx 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 TMS320™ DSP
Family
DESCRIPTION
The UCD7230A is one in the UCD7k family of digital
control compatible drivers for applications utilizing
digital control techniques or applications requiring fast
local peak current limit protection.
The UCD7230A is a MOSFET gate driver specifically
designed for synchronous buck applications. It is
ideally suited to provide the bridge between digital
controllers such as the UCD91xx or the UCD92xx
and the power stage. With cycle-by-cycle current limit
protection, the UCD7230A device protects the power
stage from faulty input signals or excessive load
currents.
V
V
IN
OUT
BIAS
I
MAX
CLF
18 16 17
VDD CSBIAS CS+
1 3V3
13 14 15 12 11 10
BST OUT1 SW PVDD OUT2 PGND
POS 8
NEG 9
2 AGND
UCD7230A
AO 7
IN 20
4 ILIM
5 CLF
SRE 19
IO 6
I
DLY
DLY 3
I_LOAD
PWM
SRE
UDG-09162
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.
TMS320, TrueDrive 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 © 2009, Texas Instruments Incorporated