PT7740 Datasheet, PDF (1/2 Pages) Texas Instruments – 32 Amp “Current Booster” for PT7778 Regulator

PT7740—3.3V
32 Amp “Current Booster” for
PT7778 Regulator
Description
The PT7740 is a high-output 32
Amp “Current Booster” 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.
SLTS117
(Revised 8/31/2000)
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.
Features
• 32A Current Boost
• Tracks Vo of a PT7778
• High Efficiency
• Input Voltage Range:
3.1V to 3.6V
• Synchronized with PT7778
• 27-pin SIP Package
• Run up to 2 in Parallel (96A)
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 Vin
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 Vout
21 Vout
22 Vout
23 Vout
24 V_out
25 Vout
26 Do not connect
27 Master Sync In
Ordering Information
PT7740t
(For dimensions and PC Board layout,
see Package Styles 1020 and 1030.)
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
L1
V _IN
1µH
C _IN
REMOTE SENSE (+)
4 32 1
VID3 - VID0
26
SNS(+)
7-11 _Vin
PT7778
Vo ^20-25
Synch
+
STBY Out GND
SNS(-)
+
5 27 13-19 12
C_OUT
GND
STBY*
REMOTE SENSE (–)
V_OUT
LOAD
GND
L1
1µH
7-11
Vin
+
C _IN
27
Synch
In
PT7740
GND
13-19
20-25
Vo
+
C_OUT
External Capacitors: When used with a PT7778, the PT7740 requires a minimum ouput capacitance of 330µF. The maximum allowable output capacitance is
30,000µF. The PT7740 also requires a minimum input capacitance of 2400µF, 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 1µH.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends