TPS7A7001DDAR

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1. Description

The TPS7A7001DDAR is a high-performance, positivevoltage, low-dropout (LDO) regulator designed for applications requiring very low input voltage and very low dropout voltage at up to 2 A. The device operates with a single input voltage as low as 1.425 V, and with an output voltage programmable to as low as 0.5 V. The output voltage can be set with an external resister divider. The TPS7A7001 features ultra-low dropout, ideal for applications where VOUT is very close to VIN. Additionally, the TPS7A7001 has an enable pin for further reduced power dissipation while in shutdown mode. The TPS7A7001 provides excellent regulation over variations in line, load, and temperature. The TPS7A7001 is available in an 8-pin SO PowerPAD™ package.

2. Features

    1. Input Voltage as Low as 1.425 V

    2. 380 mV Dropout Maximum at 2 A

    3. Adjustable Output from 0.5 V

    4. Protections: Current Limit and Thermal Shutdown

    5. Enable Pin

    6. 1-µA Quiescent Current in Shutdown Mode

    7. Full Industrial Temperature Range

    8. Available in SO-8, Fully RoHS-Compliant Package

3. Applications

    1. Telecom and Networking Cards

    2. Motherboards and Peripheral Cards

    3. Industrial

    4. Wireless Infrastructure

    5. Set-Top Boxes

    6. Medical Equipment

    7. Notebook Computers

    8. Battery-Powered Systems

4. Pin Configuration 

5. Pin Functions

6. Feature Description

  1. Enable (EN): The enable pin (EN) is an active high logic input. When it is logic low, the device turns off and its consumption current is less than 1 µA. When it is logic high, the device turns on. The EN pin is required to be connected to a logic high or logic low level. When the enable function is not required, connect EN to VIN.

  2. Internal Current Limit: The TPS7A7001 internal current limit helps protect the regulator during fault conditions. During current limit, the output sources a fixed amount of current that is largely independent of output voltage. For reliable operation, the device should not be operated in a current limit state for extended periods of time. Powering on the device with the enable pin, or increasing the input voltage above the minimum operating voltage while a low-impedance short exists on the output of the device, may result in a sequence of high-current pulses from the input to the output of the device. The energy consumed by the device is minimal during these events; therefore, there is no failure risk. Additional input capacitance helps to mitigate the load transient requirement of the upstream supply during these events.

7. Dropout Operation

If the input voltage is lower than the nominal output voltage plus the specified dropout voltage, but all other conditions are met for normal operation, the device operates in dropout mode. In this mode, the output voltage tracks the input voltage. During this mode, the transient performance of the device becomes significantly degraded because the pass device is in a triode state and no longer controls the current through the LDO. Line or load transients in dropout can result in large output-voltage deviations.