TPS70345-EP 具有加电定序的增强型产品双路输出低压降稳压器

The TPS70345 is designed to provide a complete power management solution for Texas Instruments DSP, processor power, ASIC, FPGA, and digital applications where dual output voltage regulators are required. Easy programmability of the sequencing function makes this family ideal for any Texas Instruments DSP applications with power sequencing requirement. Differentiated features, such as accuracy, fast transient response, SVS supervisory circuit (power on reset), manual reset inputs, and enable function, provide a complete system solution.

The TPS70345 voltage regulator offers low dropout voltage and dual outputs with power up sequence control, which is designed primarily for DSP applications. This device has a 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 µF low ESR capacitors.

This device has a fixed output voltage 3.3 V/1.2 V. 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 160 mV 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 low and independent of output loading (maximum of 250 µA 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 µA at T_J = 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 V_SENSE1 and V_SENSE2 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, V_OUT2 turns on first and V_OUT1 remains off until V_OUT2 reaches approximately 83% of its regulated output voltage. At that time V_OUT1 is turned on. If V_OUT2 is pulled below 83% (i.e. overload condition) of its regulated voltage, V_OUT1 will be turned off. Pulling the SEQ terminal low reverses the power-up order and V_OUT1 is turned on first. The SEQ pin is connected to an internal pullup 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 conditions at V_OUT1. The PG1 pin can be used to implement a SVS (power on reset) for the circuitry supplied by regulator 1.

The TPS70345 features a RESET (SVS, POR, or power on reset). RESET\ is an active low, open drain output and requires a pullup resistor for normal operation. When pulled up, RESET\ goes to a high impedance state (i.e. logic high) after a 120 ms delay when all three of the following conditions are met. First, V_IN1 must be above the undervoltage condition. Second, the manual reset (MR)\ pin must be in a high impedance state. Third, V_OUT2 must be above approximately 95% of its regulated voltage. To monitor V_OUT1, 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 2.7 V 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.