Texas Instruments PT7746A, PT7746C, PT7746N Datasheet
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4
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
Features
The PT7746 is a new high-performance 32 Amp “Current Booster” for
the PT7770 Series housed in a 27-pin
SIP package.
Multiple PT7746 boosters will
operate in parallel with the PT7770
boosting output current in increments of 32A. Combinations of
PT7770s and PT7746 current
boosters can easily supply enough
power for virtually any multiple
mega-processor application.
A PT7746 current booster adds a parallel
output stage driven by the PT7770. As such,
the system runs in perfect sychronization
providing a low noise solution.
The PT7746 only operates in
combination with the PT7770 series and is
not a stand-alone product. Therefore, please
refer to the PT7771, PT7772, or PT7777
series data sheet for performance
specifications. The PT7746 also has the
same mechanical dimensions and package
options as the PT7770 series.
PT7746
32 AMP “CURRENT BOOSTER”
FOR PT7770 SERIES
Ordering Information
PT7746❏
• 32A Current Boost
• Automatically Tracks
Vo of PT7770
• High Efficiency
• Input Voltage Range:
3V to 5.5V
• Synchronized with PT7770
• 27-pin SIP Package
• Run up to 2 in Parallel -
96 Amps
Standard Application
Series
(For dimensions and PC Board layout,
see Package Styles 1020 and 1030.)
Pin-Out Information
Pin Function
1 Do not connect
2 Do not connect
3 Do not connect
4 Do not connect
5 Do not connect
6 Do not connect
7V
in
8V
in
9V
in
10 V
in
11 V
in
12 Do not connect
13 GND
Pin Function
14 GND
15 GND
16 GND
17 GND
18 GND
19 GND
20 V
out
21 V
out
22 V
out
23 V
out
24 V
out
25 V
out
26 Do not connect
27 Master Sync In
PT7746
PT7770
7 - 11
13 - 19
20 - 25
27
GND GND
V
OUT
12
261
REMOTE SENSE (+)
REMOTE SENSE (-)
VID0
VID1
VID2
VID3
PROGRAMMING PINS
234
STBY*
5
C
IN
+
C
IN
+
C
OUT
+
C
OUT
+
LOAD
7 - 11 20 - 25
13 - 19
27
1µH
L1
1µH
L1
V
IN
6
VID4
PT Series Suffix
(PT1234X)
Case/Pin
Configuration
Vertical Through-Hole
N
Horizontal Through-Hole
A
Horizontal Surface Mount
C
Output Capacitors:
When used with a PT7771 or PT7772, the PT7746 requires a minimum ouput capacitance of 2400µF. When used with a PT7777,
the PT7746 requires a minimum ouput capacitance of 680µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output
capacitance is 30,000µF.
Input Filter:
An input filter is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1µH. The input
capacitance must be rated for a minimum of 2.6Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required.
Application Notes
Mechanical Outline
Product Selector Guide
Revised 8/13/98
When used with PT7771/7772:
Cin= Required 2400µF electrolytic
C
out
= Required 2400µF electrolytic
L1 = Optional 1µH input choke
When used with PT7777:
Cin= Required 2400µF electrolytic
C
out
= Required 680µF electrolytic
L1 = Optional 1µH input choke
IMPORTANT NOTICE
T exas 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
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subject to the terms and conditions of sale supplied at the time of order acknowledgement, 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.
CERT AIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICA TIONS IS UNDERSTOOD T O
BE FULLY AT THE CUSTOMER’S RISK.
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
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Copyright 1999, Texas Instruments Incorporated
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