TPS65000RTET Integrated Circuits (ICs)

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1. Describe

TPS65000RTET devices are single-chip power supplies Management (PWM) ICs for portable applications. Both devices contain a buck converter With two low dropout (LDO) regulators. step- Downconverter enters low power mode at light load Maximum efficiency over the widest possible range load current range. For low noise applications, Device can be forced into fixed frequency PWM through a pin. Buck converters are small in size Because its inductance and capacitance are very small. this Buck Converter with Power Good Output for sequencing. LDO provides 300 mA and Operates over an input voltage range of 1.6 V to 6 V. Buck converter or main battery can LDO directly. buck converters and LDO has separate voltage input to enable Maximum design and assortment flexibility.

2. Feature

    1. Buck converters:

        – VIN range from 2.3 V to 6 V

        – Generate spread spectrum clock (SSC) to reduce EMI

        – 2.25-MHz fixed frequency operation

        – 600mA or 1A (TPS650061) output current

    2. Low Dropout (LDO):

        – VIN range is 1.6 V to 6 V

        – Adjustable output voltage 

        – Output current up to 300mA

        – Independent power input and enable

    3. Supply Voltage Supervisor (TPS65001)

        – Manual reset input for pushbuttons

        – Adjustable reset time

        – Adjustable reset voltage

    4. 3mm × 3mm 16-pin WQFN (TPS65000)

    5. 3mm × 3mm 20-pin WQFN (TPS65001)

3. Application

    1. point of load

    2. Embedded processor capability

    3. cell phone

    4. cell phone

    6. Pocket PC

    7. Pocket PC

    8. Portable media player

4. Pin configuration

5. Pin Description

6. Feature Description

    1. Buck converter

        The output voltage can be selected by a resistor network at the output. The combined resistance of RDC1 and RDC2 should be less than 1 MΩ. Fixed output voltage and additional current limit options are also possible. The buck converter has two modes of operation to maximize efficiency under different load conditions. At moderate to heavy load currents, the device operates in fixed frequency pulse width modulation (PWM) mode, resulting in small output ripple and high efficiency. Pulling the MODE pin to DC high results in a mode within the PWM load range. At light load currents, the device operates in pulse frequency modulation (PFM) mode to improve efficiency. This mode transition occurs when the inductor current through the low-side FET becomes zero, indicating discontinuous conduction. PFM mode also causes the output voltage to increase by a value of 1% from its nominal setting.

    2. Linear Regulator

        Two linear dropout regulators (LDOs) are designed in the TPS65000RTET and TPS65001 to provide flexibility in system design. Each LDO has a separate voltage input and enable signal. The input can be connected to the output of a buck converter or the output of another voltage source. Each LDO output is automatically discharged to ground when EN_LDOx goes low. A resistor network is required to set the output voltage of the LDO. Fixed voltage output versions are also available. Contact your TI sales representative for more information. LDOs are general-purpose devices that can handle inputs from 6 V to 1.6 V, making them suitable for direct connection to a battery.

    3. Oscillator and Spread Spectrum Clock Generation

        The TPS65000RTET contains an internal oscillator running at a typical frequency of 2.25 MHz. This frequency is the fundamental switching frequency of the step-down converter when running in PWM mode. An additional circuit in the oscillator block implements spread spectrum clocking, which modulates the main-switching frequency when the device is in PWM mode. This spread spectrum oscillation reduces the power that may cause EMI. When viewed in the frequency domain, the SSC spreads out the frequency that may introduce interference while simultaneously reducing the power. Because the frequency is continually shifting, the amount of time the switcher spends at any single frequency is reduced. This reduction in time indicates that the receiver that may sense the interference has less time to integrate the interference.