Texas Instruments PT7748A, PT7748C, PT7748N Datasheet
• 17A Current Boost
• Automatically Tracks Vout of PT7720
• High Efficiency
• Input Voltage Range:
11V to 14V
• Synchronized with PT7720
• 27-pin SIP Package
• Run up to 4 in Parallel - 85 Amps
Standard Application
Cin= Required 560µF electrolytic
C
out
= Required 1200µF electrolytic
L1 = Optional 1µH input choke
Ordering Information
PT7748
❏❏
❏❏
❏
The PT7748 is a new high-performance 17 Amp “Current Booster” for
the PT7720 Series housed in a 27-pin
SIP package. Multiple PT7748 boosters
will operate in parallel with the PT7720
Series boosting output current in increments of 17A . Combinations of
PT7720 and PT7748 current boosters
can easily supply enough power for virtually any multiple megaprocessor
application.
A PT7748 current booster adds a
parallel output stage driven by the
PT7720. As such, the system runs in
perfect sychronization providing a low
noise solution.
The PT7748 only operates in combination with the PT7720 series and is not a
stand-alone product. Therefore please
refer the PT7720 series data sheet for
performance specifications. The PT7748
also has the same mechanical dimensions
and package options as the PT7720 series.
Features
Pin-Out Information
17 AMP “CURRENT BOOSTER”
FOR PT7720 SERIES
PT7748 Series
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 Sync In
PT7748
PT7720
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
For assistance or to order, call (800) 531-5782
52
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
Output Capacitors: The PT7720 series requires a minimum output capacitance of 1200µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance
Is (57,000 ÷ Vout)µF, or 15,000µF, whichever is less.
Input Filter: An input inductor is optional for most applications. The input inductor must be sized to handle 7ADC with a typical value of 1µH. The input capacitance must be rated for a
minimum of 4.0 Arms of ripple current when operated at maximum output current and maximum output voltage. Contact an applications engineer for input capacitor selection for
applications at other output voltages and output currents.
PT Series Suffix
(PT1234X)
Case/Pin
Configuration
Vertical Through-Hole
N
Horizontal Through-Hole
A
Horizontal Surface Mount
C
(For dimensions and PC board layout,
see Package Styles 1000 and 1010.)
Revised 1/13/99
Application Notes
Mechanical Outline
Product Selector Guide
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