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TPS767D318PWP Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS767D318PWP Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 22 page APPLICATION INFORMATION NC NC 1GND 1IN 1IN NC NC 2GND 2IN 2IN NC NC NC NC 1FB/NC 1OUT 1OUT NC NC NC 2OUT 2OUT NC NC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1EN 2EN 2RESET 1RESET U1 TPS767D325 + V I/O V CORE GND 2.5V 3.3V C 33 F 3 m C 33 F 2 m C 1 F 1 m C 1 F 0 m 5V GND R 100k 1 W R 100k 2 W PG RESET toDSP DSP DEVICE OPERATION TPS767D3xx SLVS209H – JULY 1999 – REVISED AUGUST 2008......................................................................................................................................................... www.ti.com The features of the TPS767D3xx family (low-dropout voltage, ultra low quiescent current, power-saving shutdown mode, and a supply-voltage supervisor) and the power-dissipation properties of the TSSOP PowerPAD package have enabled the integration of the dual LDO regulator with high output current for use in DSP and other multiple voltage applications. Figure 25 shows a typical dual-voltage DSP application. Figure 25. Dual-Voltage DSP Application DSP power requirements include very high transient currents that must be considered in the initial design. This design uses higher-valued output capacitors to handle the large transient currents. The TPS767D3xx features very low quiescent current, which remain virtually constant even with varying loads. Conventional LDO regulators use a pnp pass element, the base current of which is directly proportional to the load current through the regulator (IB = IC/β). Close examination of the data sheets reveals that these devices are typically specified under near no-load conditions; actual operating currents are much higher as evidenced by typical quiescent current versus load current curves. The TPS767D3xx uses a PMOS transistor to pass current; because the gate of the PMOS is voltage driven, operating current is low and invariable over the full load range. The TPS767D3xx specifications reflect actual performance under load condition. Another pitfall associated with the pnp pass element is its tendency to saturate when the device goes into dropout. The resulting drop in β forces an increase in I B to maintain the load. During power-up, this translates to large start-up currents. Systems with limited supply current may fail to start up. In battery-powered systems, it means rapid battery discharge when the voltage decays below the minimum required for regulation. The TPS767D3xx quiescent current remains low even when the regulator drops out, eliminating both problems. 10 Submit Documentation Feedback Copyright © 1999–2008, Texas Instruments Incorporated |
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