PT7742鈥?.3V
20 Amp 鈥淐urrent Booster鈥?for PT7708
Integrated Switching Regulator
SLTS085
(Revised 6/30/2000)
Description
The PT7742 is a 20 Amp 鈥淐urrent
Booster鈥?for the PT7708 housed in the
same 27-pin SIP package.
Multiple PT7742 boosters will
operate in parallel with one PT7708
product, boosting output current in
increments of 20A. Combinations of a
PT7708 regulator and PT7742 current
boosters can supply power for virtually
any multiple mega-processor applica-
tion.
A PT7742 current booster adds a
parallel output stage that is driven di-
rectly by the regulator. This allows
the system to run in perfect synchron-
ization to provide a low noise solution.
The PT7742 only operates in com-
bination with a PT7708 series regulator,
and is not a stand-alone product. Please
refer to the PT7708 data sheet for the
performance specifications.
The booster uses the same 27-pin
case and has the same package options
as its companion regulator.
Pin-Out Information
Pin Function
1
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
Pin Function
14
15
16
17
18
19
20
21
22
23
24
25
26
27
GND
GND
GND
GND
GND
GND
V
out
V
out
V
out
V
out
V
out
V
out
Do not connect
Master Sync In
(For dimensions and PC Board layout, see
Package Styles 800 and 810.)
Ordering Information
PT7742
J
Features
20A Current Boost
Tracks Vo of a PT7708
High Efficiency
Input Voltage Range:
3.1V to 3.6V
鈥?/div>
Synchronized with PT7708
鈥?/div>
27-pin SIP Package
鈥?/div>
Connect up to 2 in Parallel for
60 Amps
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
2
3
4
5
6
7
8
9
10
11
12
13
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
L1
1 H
+
STBY
REMOTE SENSE (+)
4
7-11
3
2
1
26
SNS(+)
VID3 - VID0
V
IN
Vin
PT7708
Synch
Out
GND
SNS(-)
Vo
20-25
V
OUT
C
IN
GND
STBY*
5
27
13-19
12
+
C
OUT
GND
REMOTE SENSE ( )
LOAD
27
L1
1 H
+
Synch
In
7-11
Vin
PT7742
GND
Vo
20-25
C
IN
13-19
+
C
OUT
External Capacitors:
The PT7742 requires a minimum ouput capacitance of 330碌F for proper operation. The PT7742 also requires an input capacitance of
1500碌F, which must be rated for a minimum of 1.4Arms of ripple current. For transient or dynamic load applications additional capacitance may be required.
For more information refer to the application note regarding capacitor selection for this product.
Input Filter:
An input filter inductor is optional for most applications. The inductor must be sized to handle 20ADC with a typical value of 1碌H.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
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