PT7740鈥?.3V
32 Amp 鈥淐urrent Booster鈥?for
PT7778 Regulator
SLTS117
(Revised 8/31/2000)
Description
The PT7740 is a high-output 32
Amp 鈥淐urrent Booster鈥?designed to
operate with the PT7778 regulator.
Up to two PT7740 boosters will
operate in parallel with a PT7778,
boosting output current in increments
of 32A. Combinations of a PT7778
series regulator and PT7740 current
boosters can supply enough power for
virtually any multiple 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 PT7740 only operates with a
PT7778 regulator and is not a stand-
alone product. Please refer to the
PT7778 data sheet for the perfor-
mance specifications. The current
booster has the same package options
as its companion regulator.
Pin-Out Information
Features
32A Current Boost
Tracks Vo of a PT7778
High Efficiency
Input Voltage Range:
3.1V to 3.6V
鈥?/div>
Synchronized with PT7778
鈥?/div>
27-pin SIP Package
鈥?/div>
Run up to 2 in Parallel (96A)
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
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
PT7740
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
L1
1碌H
+
STBY
REMOTE SENSE (+)
4
7 - 1 1
Vin
3
2
1
26
SNS(+)
VID3 - VID0
V
IN
PT7778
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
PT7740
GND
Vo
20-25
C
IN
13-19
+
C
OUT
External Capacitors:
When used with a PT7778, the PT7740 requires a minimum ouput capacitance of 330碌F. The maximum allowable output capacitance is
30,000碌F. The PT7740 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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