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TPS40021 Datasheet

  • TPS40021

  • 增强型低输入 (2.25V-5.5V)、最高频率 1MHz 的同步 降压控制器，...

  • 447.13KB

  • 32页

  • TI

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8
TPS40020
TPS40021
SLUS535C 鈭?MARCH 2003 鈭?REVISED SEPTEMBER 2004
ENHANCED, LOW INPUT VOLTAGE MODE
SYNCHRONOUS BUCK CONTROLLER
FEATURES
D
D
D
D
Operating Input Voltage 2.25 V to 5.5 V
Output Voltage as Low as 0.7 V
1% Internal 0.7 V Reference
Predictive Gate Drive铮?N-Channel MOSFET
Drivers for Higher Efficiency
Circuit Current Limit
DESCRIPTION
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铮?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铮?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.
D
Externally Adjustable Soft-Start and Short
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铮?Package
APPLICATIONS
D
D
D
D
D
Networking Equipment
Telecom Equipment
Base Stations
Servers
DSP Power
VDD
VDD 2.25 V 鈭?5.5 V
1
VOUT
2
3
4
5
6
7
8
TPS40020
ILIM/
SYNC
VDD
OSNS
FB
COMP
SS/SD
RT
SGND
BOOT1 16
HDRV
SW
BOOT2
PVDD
LDRV
PGND
15
14
13
12
11
10
VOUT
PWRGD 9
UDG鈭?2094
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铮?and Predictive Gate Drive铮?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
铮?/div>
2004, Texas Instruments Incorporated

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