18 AMP 鈥淐URRENT BOOSTER鈥?/div>
FOR PT7700 SERIES
Revised 8/13/98
The PT7749 is a new high-perfor-
mance 18 Amp 鈥淐urrent Booster鈥?for
the PT7700 Series housed in a 27-pin
SIP package.
Multiple PT7749 boosters will oper-
ate in parallel with the PT7700 boosting
output current in increments of 18A .
Combinations of PT7700s 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 by the PT7700.
As such, the system runs in perfect
sychronization providing a low noise solu-
tion.
The PT7749 only operates in combina-
tion with the PT7700 series and is not a
stand-alone product. Therefore please refer
the PT7705, PT7706, or PT7707 series
data sheet for performance specifications.
The PT7749 also has the same mechanical
dimensions and package options as the
PT7700 series.
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
PT7749
t
(For dimensions and PC Board layout,
see Package Styles 800 and 810.)
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Current Boost
Automatically Tracks Vout of PT7700
High Efficiency
Input Voltage Range: 3V to 5.5V
Synchronized with PT7700
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
V
in
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
1碌H
+
27
PT7700
13 - 19
5
12
20 - 25
V
OUT
C
IN
STBY*
GND
C
OUT
+
LOAD
GND
REMOTE SENSE (-)
27
L1
7 - 11
1碌H
+
PT7749
13 - 19
20 - 25
When used with PT7705/7706:
Cin = Required 1200碌F electrolytic
Cout = Required 1200碌F electrolytic
L1
= Optional 1碌H input choke
When used with PT7707:
Cin = Required 1200碌F electrolytic
Cout = Required 330碌F electrolytic
L1
= Optional 1碌H input choke
C
IN
C
OUT
+
Output Capacitors:
When used with a PT7705or PT7706, the PT7749 requires a minimum ouput capacitance of 1200碌F. When used with a PT7707, the PT7749
requires a minimum ouput capacitance of 330碌F for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance is 15,000碌F.
Input Filter:
An input filter is optional for most applications. The input inductor must be sized to handle 18ADC with a typical value of 1碌H. 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.
40
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902
http://www.powertrends.com
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