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PT7744--3.3V
20 Amp "Current Booster" for PT7712 Integrated Switching Regulator
SLTS089
(Revised 6/30/2000)
Description
The PT7744 is a 20 Amp "Current Booster" for the PT7712 housed in the same 27-pin SIP package. Multiple PT7744 boosters will operate in parallel with one PT7712 product, boosting output current in increments of 20A. Combinations of a PT7712 regulator and PT7744 current boosters can supply power for virtually any multiple mega-processor application. A PT7744 current booster adds a parallel output stage that is driven directly by the regulator. This allows the system to run in perfect synchronization to provide a low noise solution. The PT7744 only operates in combination with a PT7712 series regulator, and is not a stand-alone product. Please refer to the PT7712 data sheet for the performance specifications. The booster uses the same 27-pin case and has the same package options as its companion converter.
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 Vout Vout Vout Vout Vout Vout Do not connect Master Sync In
Ordering Information PT7744J
(For dimensions and PC Board layout, see Package Styles 1420 and 1430.)
Features
* * * * * * * * 20A Current Boost Tracks Vo of a PT7712 High Efficiency Input Voltage Range: 3.1V to 3.6V Synchronized with PT7712 27-pin SIP Package Solderable Copper Case Connect up to 2 in Parallel for 60 Amps
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 1H
+
STBY
REMOTE SENSE (+)
4 7-11
3
2
1
26
SNS(+)
VID3 - VID0
V IN
Vin
PT7712
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 1H
+
Synch In
7-11
Vin
PT7744
GND
Vo
20-25
C IN
13-19
+
C OUT
External Capacitors: The PT7744 requires a minimum ouput capacitance of 330F for proper operation. The PT7744 also requires an input capacitance of 1500F, 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 further 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 1H.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes
PT7711/PT7712, PT7744/PT7745
Capacitor Recommendations for the PT7711/12 Regulators and PT7744/45 Current Boosters
Input Capacitors The recommended input capacitance is determined by 1.4 ampere minimum ripple current rating and 1500F minimum capacitance. Capacitors listed below must be rated for a minimum of 2x the input voltage with +5V operation. Ripple current and 100m Equivalent Series Resistance (ESR) values are the major considerations along with temperature when selecting the proper capacitor. Output Capacitors The minimum required output capacitance is 330F with a maximum ESR less than or equal to 100m. Failure to observe this requirement may lead to regulator instability or oscillation. Electrolytic capacitors have poor ripple performance at frequencies greater than 400kHz, but excellent low frequency transient response. Above the ripple frequency ceramic decoupling capacitors are necessary to improve the transient response and reduce any microprocessor high frequency noise components apparent during higher current excursions. Preferred low ESR type capacitor part numbers are identified in the T able 1 below.
Table 1 Capacitors Characteristic Data
Tantalum Characteristics T antalum capacitors with a minimum 10V rating are recommended on the output bus, but only the AVX TPS Series, Sprague 594/595 Series, or Kemet T495/T510 Series. The AVX TPS Series, Sprague Series or Kemet Series capacitors are specified over other types due to their higher surge current, excellent power dissipation and ripple current ratings. As an example, the TAJ Series by AVX is not recommended. This series exhibits considerably higher ESR, reduced power dissipation and lower ripple current capability. The TAJ Series is a less reliable compared to the TPS series when determining power dissipation capability. Capacitor Table T able 1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple current (rms) ratings. The suggested minimum quantities per regulator for both the input and output buses are identified. This is not an extensive capacitor list. The table below is a selection guide for input and output capacitors. Other capacitor vendors are available with comparable RMS ripple current rating and ESR (Equivalent Series Resistance at 100kHz). These critical parameters are necessary to insure both optimum regulator performance and long capacitor life.
Capac i t or Ve n d o r / Ser i es
Working Voltage Panasonic FC Surface Mtg FA United Chemi -Con LFVSeries Nichicon PL Series PM Series Oscon SS SV AVX Tanatalum TPS- Series Sprague Tantalum 595D/594D Kemet Tantalum T510/T495 Series Sanyo Poscap TPB 16V 35V 10V 16V 25V 16V 16V 10V 10V 25V 10V 10V 10V 10V 10V 10V 10V 10V 10V Value(F)
Capac i t or Char ac t e r i s t i c s
Qu a n t i t y
( ESR) Equi v al e nt Se r i e s Re s i s t anc e 0.038 0.065 0.090 0.032 0.084 0.038 0.084/2=042 0.090 0.044 0.095 0.025W/4=0.006 0.020/4=0.005 0.100/5=20 0.060 0.045W/4=0.011 0.090 0.035 0.070/2=0.035 0.040
1 0 5 C Ma x i m u m Ri ppl e C u r r e n t ( I r ms ) 2000mA 1205mA 755mA 2000mA 825mA 1630mA 825mA x2 770mA 1420mA 750mA >9800mA >9800mA 3500mA 1826mA >4500mA >1660mA 2000mA >2000mA 3000mA
Phy s i c al S i z e ( mm) 18x16.5 12.5x16.5 10x12.5 18x15 10x16 16x20 10x16 10x15 16x15 10x15 10x10.5 10.3x12.6 7.3Lx 4.3Wx 4.1H 7.3L x 5.7W x 4.0H 4.3Wx7.3L x4.0H
I nput Bu s 1
Ou t p u t Bu s 1 1 1 1 1 1 1 1 1 1 N/R (Note) 1 1 1 1 1 2 2
Vendor Number
2200 330 680 1800 330 2200 470 680 1800 330 330 330 330 330 330 680 330 220 220
EEVFC1C222N EEVFC1V331LQ EEUFA1A681 EEUFA1C182A LXV25VB331M10X16LL LXV16VB222M16X20LL LXV16VB471M10X16LL UPL1A681MHH6 UPL1A182MHH6 UPL1E331MPH6 10SS330M 10SV330M(Sufvace Mtg TPSV337M010R0100 TPSV337M010R0060 594D337X0010R2T Surface Mount 595D687X0010R2T 510X337M010AS T495X227M010AS Surface Mount 10TPB220M Surface Mount
1
1
1 4 4 5 5 5 2 5 6 6
7.2L x 4.3W x 3.1H
Note: (N/R) is not recommended for this application, due to extremely low Equivalent Series Resistance (ESR)
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Package S tyle 1420
S uffix N
(Revised 6/30/2000)
PACKAGE INFORMATION AND DIMENSIONS
Power Trends proprietary package design. All rights reserved. Patent pending.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Package S tyle 1430
S uffix A, C
(Revised 6/30/2000)
PACKAGE INFORMATION AND DIMENSIONS
Power Trends proprietary package design. All rights reserved. Patent pending.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each deviceis not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright (c)
2000, Texas Instruments Incorporated

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