TPS61221DCKT

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1. Describe

TPS61221DCKR series devices provide power solutions for single battery powered products, Two batteries, or three alkaline, NiCd or NiMH batteries, or one Battery Lithium-ion or Lithium-polymer battery. possible output The current depends on the ratio of the input to output voltage. Hysteresis Based Boost Converter Controller Topology Using Synchronous Rectification Maximum efficiency, minimum static current. Adjustable version with output voltage can be programmed via an external resistor divider, or Internally set to a fixed output voltage. this The converter can be turned off by the function enable pin. When off, battery consumption is minimize. The device uses a 6-pin SC-70 For small circuit layout sizes, the package (DCK) size is 2 mm x 2 mm.

2. Feature

    1. Up to 95% efficiency under typical operating conditions

    2. 5.5 μA quiescent current

    3. Start the load at 0.7 V input voltage

    4. Operating input voltage range from 0.7 V to 5.5 V

    5. Power-off pass-through function

    6. Minimum switching current 200 mA

    7. Protect:

        – Output overvoltage

        – over temperature

        – Input undervoltage lockout

    8. Adjustable output voltage from 1.8 V to 6 V

    9. Fixed output voltage version

  10. Small 6-pin SC-70 package

3. Application

    1. Battery powered applications

        – 1 to 3 alkaline batteries, NiCd or NiMH

        – 1 cell Li-ion or Li-ion battery

    2. Solar or fuel cell powered applications

    3. Consumer and portable medical products

    4. Personal care products

    5. White or status LED

    6. cell phone

4. Pin configuration

5. Device Functional Modes

    1. Enabled or disabled

    2. Continuous or discontinuous current operation

    3. Protective mechanisms

        – Output Overload

        – Undervoltage

        – Overvoltage

        – Overtemperature

6. Function description

The device is controlled by a hysteretic current mode controller. The controller regulates the output voltage by keeping the inductor ripple current constant within 200 mA and adjusting the offset of this inductor current according to the output load. If the required average input current is lower than the average inductor current defined by this constant ripple current, the inductor current becomes discontinuous to maintain high efficiency at low load conditions. The output voltage VOUT is monitored through a feedback network connected to a voltage error amplifier. To regulate the output voltage, the voltage error amplifier compares this feedback voltage to an internal reference voltage and adjusts the desired inductor current offset accordingly. In fixed output voltage devices, an internal feedback network is used to program the output voltage. In the adjustable version, an external resistor divider is required. The self-oscillating hysteretic current-mode architecture is inherently stable and responds quickly to load changes. This architecture also allows a wide range of inductor and capacitor values to be used. When EN is driven high, the device is enabled, and when EN is low, the device is disabled. During shutdown, the converter stops switching and all internal control circuits are closed. During shutdown, the input voltage is connected to the output through the back-gate diode of the rectifier MOSFET. This means that the voltage is always present at output, which can be as high or lower than the input voltage, depending on the load.