PT7741鈥?V
32 Amp 鈥淐urrent Booster鈥?for
PT7775/PT7779 Regulators
SLTS118
(Revised 8/31/2000)
Description
The PT7741 is a high-output 32
Amp 鈥淐urrent Booster鈥?designed to
operate with the PT7775 and
PT7779 regulators. Up to two
PT7741 boosters will operate in
parallel with one regulator, boosting
output current in increments of 32A.
Combinations of one regulator and
PT7741 current boosters can supply
enough power for virtually any mul-
tiple mega-processor application.
The booster adds a parallel output
stage that is driven directly by the
regulator. Both operate in perfect
sychronization for a low noise solution.
The PT7741 only operates with
the PT7775 and PT7775 regulators.
It is not a stand-alone product. Please
refer to the appropriate data sheet for
the performance specifications. The
current booster has the same package
options as the companion regulators.
Pin-Out Information
Features
鈥?/div>
32A Current Boost
鈥?/div>
Tracks Vo of either a
PT7775 or PT7779
鈥?/div>
High Efficiency
鈥?/div>
Input Voltage Range:
4.5V to 5.5V
鈥?/div>
Synchronized with Regulator
鈥?/div>
27-pin SIP Package
鈥?/div>
Run up to 2 in Parallel (96A)
Pin Function
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
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
Ordering Information
PT7741
t
(For dimensions and PC Board layout,
see Package Styles 1020 and 1030.)
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
L1
1碌H
+
STBY
REMOTE SENSE (+)
6
7 - 1 1
Vin
4
3
2
1
26
SNS(+)
VID4 - VID0
V
IN
PT7775/9
Synch
Out
GND
SNS(-)
Vo
20-25
V
OUT
C
IN
GND
STBY*
5
27
13-19
12
+
C
OUT
GND
REMOTE SENSE (鈥?
LOAD
27
L1
1碌H
+
Synch
In
7 - 1 1
Vin
PT7741
GND
Vo
20-25
C
IN
13-19
+
C
OUT
External Capacitors:
When used with a PT7779, the PT7741 requires a minimum ouput capacitance of 330碌F. The maximum allowable output capacitance is
30,000碌F. The PT7741 also requires a minimum input capacitance of 2400碌F, which must be rated for a minimum of 2.0Arms of ripple current. For transient
or dynamic load applications, additional capacitance may be required. For further information, see the accompanying application note on capacitor selection for this
product.
Input Filter:
An input filter inductor is optional for most applications. The input inductor must be sized to handle 32ADC 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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