PT7742 Datasheet, PDF (1/4 Pages) Texas Instruments – 20 Amp Current Booster for PT7708 Integrated Switching Regulator

PT7742—3.3V
20 Amp “Current Booster” for PT7708
Integrated Switching Regulator
Description
The PT7742 is a 20 Amp “Current
Booster” 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
SLTS085
(Revised 6/30/2000)
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.
Features
• 20A Current Boost
• Tracks Vo of a PT7708
• High Efficiency
• Input Voltage Range:
3.1V to 3.6V
• Synchronized with PT7708
• 27-pin SIP Package
• Connect up to 2 in Parallel for
60 Amps
Standard Application
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
7 V_in
8 Vin
9 Vin
10 V_in
11 Vin
12 Do not connect
13 GND
Pin Function
14 GND
15 GND
16 GND
17 GND
18 GND
19 GND
20 V_out
21 Vout
22 Vout
23 V_out
24 Vout
25 Vout
26 Do not connect
27 Master Sync In
Ordering Information
PT7742J
(For dimensions and PC Board layout, see
Package Styles 800 and 810.)
PT Series Suffix
(PT1234X)
Case/Pin
Configuration
Vertical Through-Hole
N
Horizontal Through-Hole A
Horizontal Surface Mount C
PROGRAMMING PINS
VID0
VID1
VID2
VID3
REMOTE SENSE (+)
4321
VID3 - VID0
26
SNS(+)
V_IN
L1
7-11 _Vin
PT7708
Vo ^20-25
1H
Synch
+
C _IN
STBY Out GND
SNS(-)
5 27 13-19 12
+
C_OUT
GND
STBY*
REMOTE SENSE ( )
V_OUT
LOAD
GND
L1
7-11 _Vin
1H
+
C _IN
27
Synch
In
PT7742
GND
13-19
Vo ^20-25
+
C_OUT
External Capacitors: The PT7742 requires a minimum ouput capacitance of 330µF for proper operation. The PT7742 also requires an input capacitance of
1500µF, 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 1µH.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends