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PT7711 Datasheet(PDF) 5 Page - Texas Instruments |
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PT7711 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 9 page For technical support and more information, see inside back cover or visit www.ti.com Application Notes Increasing the Output of the PT7710 Family of ISRs with a 20-A Compatible Current Booster The output of PT7710 family of regulators (PT7711– PT7716) can produce an additional 20-A output using a compatible current booster module. Two booster modules are available. They are the PT7744 and PT7745, which are compatible with regulators that operate off 3.3-V or 5-V input buses respectively. Refer to Table 2-1 for regulator/booster compatiblity. The booster modules are controlled directly by the regu- lator and effectively add a parallel output stage. They operate sychronously, to provide a low-noise solution. Up to two booster modules can be connected to a PT771x regulator. Each booster added increases the regulator’s output current by 20A, for up to 60A of output current. Current boosters are not stand-alone products, and can only operate with a regulator. They are housed in the same package as the regulator, and share the same mechanical outline. Except for an increase in output current, the overall performance of a regulator/booster combination is identical to that of a stand-alone regulator. For more details refer to the applicable regulator specifications. PT7710 Series, PT7744, PT7745 Figure 1-1; Current Booster Application Schematic C IN + C OUT + LOAD V IN VID0 VID1 VID2 VID3 V OUT GND GND STBY* L IN 1µH REMOTE SENSE (–) REMOTE SENSE (+) PROGRAMMING PINS C IN + L IN 1µH PT7744/45 Booster 20-25 13-19 27 7-11 V O V IN GND Synch In VID4 C OUT + PT771x 64 321 26 20-25 12 5 13-19 27 7-11 V O V IN GND SNS(+) SNS(-) Synch Out STBY VID4 - VID0 Table 2-2; Booster Pin-Out Information Pin Function Pin Function Pin Function 1 No Connect 10 Vin 19 GND 2 No Connect 11 Vin 20 Vout 3 No Connect 12 No Connect 21 Vout 4 No Connect 13 GND 22 Vout 5 No Connect 14 GND 23 Vout 6 No Connect 15 GND 24 Vout 7Vin 16 GND 25 Vout 8Vin 17 GND 26 No Connect 9Vin 18 GND 27 Sync In Notes: 1. Each booster requires the same amount of input and output capacitance as recommended for a stand-alone regulator. Consult the individual data sheet of the applicable regulator, and the related application note regarding capacitor selection for this product family. 2. The 1-µH filter choke located at the input of each regulator and booster module (Lin) is optional for most applications. If specified, each inductor must be sized to handle 20ADC at full output load. 3. The pin-out of the current booster modules include a number pins identified, “No Connect” (see Table 2-2). These pins are not connected internally to the module but must be soldered to a pad to preserve the unit’s mechanical integrity. 4. A similar PCB footprint and trace layout between the regulator and each booster will facilitate current sharing between all modules. Table 2-1; Booster Compatibility P7744 Booster PT7745 Booster Regulator (3.3V Input Bus) (5V Input Bus) PT7711 • PT7712 • PT7713 • PT7714 • PT7715 • PT7716 • |
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