For assistance or to order, call
(800) 531-5782
PT7743
Series
20 AMP “CURRENT BOOSTER”
FOR PT7709 REGULATOR
Preliminary 2/18/2000
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Ad rm
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The PT7743 is a high-performance
20 Amp “Current Booster”, specifically
designed to operate with the PT7709
series regulator.
A PT7743 booster will operate in
parallel with a PT7709 to provide an
additional 20A of output current.
A combination of a PT7709 and up
to fourPT7743 boosters can power
virtually any multiple mega-processor
application with up to 100A of supply
current.
Each PT7743 current booster adds
another output stage to the PT7709
regulator and operates in perfect
sychronization.
The PT7743 is not a stand-alone
product and can only be used in combi-
nation with the PT7709. Please refer to
the PT7709 series data sheet for the
performance specifications. The PT7743
booster has the same mehanical dimen-
sions and package options as the PT7709
regulator.
Pin-Out Information
Pin Function
Pin Function
15
16
17
18
19
20
21
22
23
24
25
26
27
GND
GND
GND
GND
GND
V
out
V
out
V
out
V
out
V
out
V
out
Do not connect
Master Sync In
Ordering Information
PT7743
❏
(For dimensions and PC Board layout,
see Package Styles 800 and 810.)
Features
•
•
•
•
•
•
•
•
•
20A Current Boost
Output Tracks PT7709
High Efficiency
Short Circuit Protection
Input Voltage Range: 4.5V to 5.5V
Synchronized with PT7709
27-pin SIP Package
Run up to 4 in Parallel - 100 Amps
Short Circuit Protection
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
V
in
V
in
V
in
V
in
V
in
Do not connect
GND
GND
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 (+)
6 4 3 2 1
26
V
IN
L1
7 - 11
1H
+
PT7709
PT7770
27
13 - 19
5
12
20 - 25
V
OUT
C
IN
STBY*
GND
C
OUT
+
LOAD
GND
REMOTE SENSE (-)
27
L1
7 - 11
1H
+
PT7743
PT7746
13 - 19
20 - 25
Cin = Required 1500µF electrolytic
Cout = Required 330µF electrolytic
L1 = Optional 1µH input choke
C
IN
C
OUT
+
Output Capacitors:
The PT7709 and PT7743 each require a minimum ouput capacitance of 330µF for proper operation. Do not use Oscon type capacitors.
Input Filter:
An input filter is optional for most applications. The input inductor must be sized to handle 20ADC 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.
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902
http://www.ti.com/powertrends
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