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Part: PT7749A
Category:
Power Management
-> Plug-in Power Solutions->Non-Isolated->Single Posi
Description: ti PT7749, 18Amp 'Current Booster' For The PT7700/PT7770 Series
Company: Texas Instruments, Inc.
Datasheet: Download PT7749A datasheet File size : 117 kB
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Datasheet text preview:
PT7749--5V
18 Amp "Current Booster" for PT7700 Series
SLTS052A
(Revised 6/30/2000)
The PT7749 is a high-performance 18 Amp "Current Booster" for the PT7705/6 Regulators housed in a 27pin SIP package. Multiple PT7749 boosters will operate in parallel with the PT7705/6 regulators, boosting output current in increments of 18A . Combinations of a PT7705/6 and PT7749 current boosters can easily supply enough power for virtually any multiple megaprocessor application.
A PT7749 current booster adds a parallel output stage driven directly by the main regulator. As such, the system runs in perfect sychronization providing a low noise solution. The PT7749 only operates in combination with the PT7705/6 regulators and is not a stand-alone product. Therefore please refer the appropriate series data sheet for performance specifications.
Pin-Out Information
Pin F u n c t i o n Pin F u n c t i o n
15 16 17 18 19 20 21 22 23 24 25 26 27 GND GND GND GND GND Vout Vout Vout Vout Vout Vout Do not connect Master Sync In
Features
· · · · · · · Current Boost Tracks Vout of PT7705/06/07 High Efficiency Input Voltage Range: 3V to 5.5V Synchronized with Regulator 27-pin SIP Package Run up to 4 in Parallel - 90 Amps
1 2 3 4 5 6 7 8 9 10 11 12 13
Do not connect Do not connect Do not connect Do not connect Do not connect Do not connect Vi n Vi n Vi n Vi n Vi n Do not connect GND GND
Ordering Information PT7749 o
(For dimensions and PC Board layout, see Package Styles 800 and 810.)
PT Series Suffix (PT1234X)
Case/Pin Configuration Vertical Through-Hole Horizontal Through-Hole Horizontal Surface Mount
N A C
Standard Application
PROGRAMMING PINS
VID0 VID1 VID2 VID3 VID4
14
REMOTE SENSE (+)
64321 26
VIN
L1
7 - 11
1µH +
27
PT7700
13 - 19 5 12
20 - 25
VOUT
CIN STBY* GND
COUT
+
LOAD
GND
REMOTE SENSE (-)
27
L1
7 - 11
1µH +
PT7749
13 - 19
20 - 25
When Cin Co u t L1 When Cin Co u t L1
used with PT7705/7706: = Required 1200µF electrolytic = Required 1200µF electrolytic = Optional 1µH input choke used with PT7707: = Required 1200µF electrolytic = Required 330µF electrolytic = Optional 1µH input choke
CIN
COUT
+
Output Capacitors: When used with a PT7705or PT7706, the PT7749 requires a minimum ouput capacitance of 1200µF. When used with a PT7707, the PT7749 requires a minimum ouput capacitance of 330µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance is 15,000µF. Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 18ADC with a typical value of 1µH. The input capacitance must be rated for a minimum of 1.3Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright © 2000, Texas Instruments Incorporated
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