TPS40020_16 Datasheet, PDF (1/34 Pages) Texas Instruments – ENHANCED, LOW-INPUT VOLTAGE-MODE SYNCHRONOUS BUCK CONTROLLER

Not Recommended for New Designs
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TPS40020
8
TPS40021
SLUS535D − MARCH 2003 − REVISED JULY 2007
ENHANCED, LOWĆINPUT VOLTAGEĆMODE
SYNCHRONOUS BUCK CONTROLLER
FEATURES
DESCRIPTION
D Operating Input Voltage 2.25 V to 5.5 V
D Output Voltage as Low as 0.7 V
D 1% Internal 0.7 V Reference
D Predictive Gate Drive N-Channel MOSFET
Drivers for Higher Efficiency
D Externally Adjustable Soft-Start and Short
Circuit Current Limit
D Programmable Fixed-Frequency
100 KHz-to-1 MHz Voltage-Mode Control
D Source-Only Current or Source/Sink Current
D Quick Response Output Transient
Comparators with Power Good Indication
Provide Output Status
D 16-Pin PowerPAD Package
APPLICATIONS
D Networking Equipment
D Telecom Equipment
D Base Stations
D Servers
D DSP Power
The TPS4002x family of dc-to-dc controllers are designed
for non-isolated synchronous buck regulators, providing
enhanced operation and design flexability through user
programmability.
The TPS4002x utilizes a proprietary Predictive Gate
Drive technology to minimize the diode conduction
losses associated with the high-side and synchronous
rectifier N-channel MOSFET transistions. The integrated
charge pump with boost circuit provides a regulated 5-V
gate drive for both the high side and synchronous rectifier
N-channel MOSFETs. The use of the Predictive Gate
Drive technology and charge pump/boost circuits
combine to provide a highly efficient, smaller and less
expensive converter.
Design flexibility is provided through user programmability
of such functions as: operating frequency, short circuit
current detection thresholds, soft-start ramp time, and
external synchronization frequency. The operating
frequency is programmable using a single resistor over a
frequency range of 100 kHz to 1 MHz. Higher operating
frequencies yield smaller component values for a given
converter power level as well as faster loop closure.
VDD 2.25 V − 5.5 V
TPS40020
1
ILIM/
SYNC
BOOT1 16
VDD
VOUT
VOUT
2 VDD HDRV 15
3 OSNS
SW 14
4 FB BOOT2 13
5 COMP PVDD 12
6 SS/SD LDRV 11
7 RT
PGND 10
8 SGND PWRGD 9
UDG−02094
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.
PowerPAD and Predictive Gate Drive are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright  2004, Texas Instruments Incorporated