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TPS70345 Datasheet(PDF) 2 Page - Texas Instruments |
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TPS70345 Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 46 page  1.8V VIN1 VIN2 EN SEQ VOUT1 VSENSE1 PG1 MR2 RESET MR1 VSENSE2 TPS70351PWP 5V 3.3V I/O MR1 Core 0.22 F m RESET 22 F m 47 F m 0.22 F m DSP MR2 PG1 EN 250kW >2V <0.7V 250kW >2V <0.7V >2V <0.7V VOUT2 TPS70345, TPS70348 TPS70351, TPS70358 TPS70302 SLVS285H – AUGUST 2000 – REVISED APRIL 2010 www.ti.com The TPS703xx family of voltage regulators offers very low dropout voltage and dual outputs with power up sequence control, designed primarily for DSP applications. These devices have low noise output performance without using any added filter bypass capacitors, and are designed to have a fast transient response and be stable with 47 mF low ESR capacitors. These devices have fixed 3.3 V/2.5 V, 3.3 V/1.8 V, 3.3 V/1.5 V, 3.3 V/1.2 V, and adjustable voltage options. Regulator 1 can support up to 1 A, and regulator 2 can support up to 2 A. Separate voltage inputs allow the designer to configure the source power. Because the PMOS pass element behaves as a low-value resistor, the dropout voltage is very low (typically 160mV on regulator 1) and is directly proportional to the output current. Additionally, since the PMOS pass element is a voltage-driven device, the quiescent current is very low and independent of output loading (maximum of 250 mA over the full range of output current). This LDO family also features a sleep mode; applying a high signal to EN (enable) shuts down both regulators, reducing the input current to 1 mA at TJ = +25°C. The device is enabled when the EN pin is connected to a low-level input voltage. The output voltages of the two regulators are sensed at the VSENSE1 and VSENSE2 pins respectively. The input signal at the SEQ pin controls the power-up sequence of the two regulators. When the device is enabled and the SEQ terminal is pulled high or left open, VOUT2 turns on first and VOUT1 remains off until VOUT2 reaches approximately 83% of its regulated output voltage. At that time VOUT1 is turned on. If VOUT2 is pulled below 83% (that is, in an overload condition) of its regulated voltage, VOUT1 is turned off. Pulling the SEQ terminal low reverses the power-up order and VOUT1 is turned on first. The SEQ pin is connected to an internal pull-up current source. For each regulator, there is an internal discharge transistor to discharge the output capacitor when the regulator is turned off (disabled). The PG1 pin reports the voltage condition at VOUT1. The PG1 pin can be used to implement an SVS (POR, or power-on reset) for the circuitry supplied by regulator 1. The TPS703xx features a RESET (SVS, POR, or power-on reset). RESET is an active low, open drain output and requires a pull-up resistor for normal operation. When pulled up, RESET goes to a high impedance state (that is, logic high) after a 120 ms delay when all three of the following conditions are met. First, VIN1 must be above the undervoltage condition. Second, the manual reset (MR) pin must be in a high impedance state. Third, VOUT2 must be above approximately 95% of its regulated voltage. To monitor VOUT1, the PG1 output pin can be connected to MR1 or MR2. RESET can be used to drive power-on reset or a low-battery indicator. If RESET is not used, it can be left floating. Internal bias voltages are powered by VIN1 and require 2.7V for full functionality. Each regulator input has an undervoltage lockout circuit that prevents each output from turning on until the respective input reaches 2.5 V. 2 Submit Documentation Feedback Copyright © 2000–2010, Texas Instruments Incorporated |
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