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tps61220
Related Posts

  • Forum Post: Re: Microphone Power Requirements

    Michael Day
    The Power Quick Search is a good tool for finding power solutions. From www.ti.com , click on Power Management and you will see the fields where you enter your input and output voltages and current. For devices that have PWM/PFM mode, you will need to configure the IC to operate in fixed PWM mode. Also...
    on Jan 18, 2010

  • Forum Post: Re: what happen if the input voltage is higher for a boost converter?

    Michael Day
    The output voltage will track the input voltage. As Vin goes higher, Vout goes higher. There will be a voltage drop across the IC that is a function of the load current. If you need a regulated 3.3V, please consider the TPS61200. The TPS61200 provides a regulated output voltage even if Vin is greater...
    on Feb 4, 2010

  • Forum Post: TPS61220 : Reverse Voltage Protection

    Bijeta chakraborty9485
    My customer is considering the part Tps61220 for the below mentioned specs. The maximum output current from the boost regulator is 75mA. Startup voltage is mimimum 1.0V. I/p voltage range: 0.8V to 1.9V, Output: 3.0V Does the TPS61220 have reverse Voltage protection feature also. Will this...
    on Feb 26, 2010

  • Forum Post: Re: TPS61220 : Reverse Voltage Protection

    Michael Day
    The TPS61220 does not have built in reverse voltage protection. At this time, TI does not provide power solutions with built in protection circuitry. Please refer to this applicaion note for assistance on understanding and designing discrete reverse voltage protection circuitry. http://focus.ti...
    on Mar 2, 2010

  • Forum Post: Re: TPS61220 quiescent current

    Chris Glaser
    From another post on this topic: "Quiescent current is the current required to power the internal circuitry of the IC. This current is measured in a non-switching condition. Please note that quiescent current is not the same as no-load current. With no load, the IC continues to switch, which takes...
    on Apr 6, 2010

  • Forum Post: Re: Battery powered designs

    Chris Glaser
    What are your output current requirements on the 3.3V? If they are low enough, you could also look into using the TPS61220 or TPS61070 which are simpler, smaller parts. The TPS61020 and other boost converters provide a clean, regulated output voltage that is good enough to power most circuits. For...
    on Sep 17, 2010

  • Forum Post: Re: Battery powered designs

    Chris Glaser
    Yes, the TPS61220 should work for your design, based on the output current you have. One note on the output current of any boost converter: the switch current limit is not equal to the output current. In a boost converter the switch current is always many times greater than the output current, because...
    on Sep 20, 2010

  • Forum Post: Re: Voltage drop using TPS61222....

    Chris Glaser
    Make sure that your PCB layout follows the recommendations in the datasheet. You can also order the EVM to do your testing on it, knowing that it has a good layout. Can you post your layout? Also, what are you using for your input supply? What voltage is it? Have you verified that it is not current...
    on Oct 1, 2010

  • Forum Post: Re: TPS61220 step-up converter not working as specified

    Chris Glaser
    What board are you using to run your circuit on? Is it the EVM? Layout is very critical with these parts. Can you post your layout? Please confirm that your input supply is not current limiting and also measure the Vin voltage on the board that you using at the IC's input terminals. A boost converter...
    on Oct 22, 2010

  • Forum Post: Re: TPS61200 - operating from solar cell

    FRANCK DELPINO
    Hello Michael Do you think the TPS61220 is able to work as the same maner as the TPS61200 in the application note. Franck
    on Dec 16, 2010

  • Forum Post: TPS61220 Variable Output Voltage

    Jason Panjikaran
    Hello, I am trying to use the TPS61220 and configure it for a variable output voltage of 2-5V. According to the datasheet this can be done using voltage division with fixed resistors. In the datasheet it states that R1 (resistor between Vout and Vfb) should be changed to provide the required voltage...
    on Jan 10, 2011

  • Forum Post: TPS61220 - Output Short to GND

    Poh Leong Ng
    Can TPS61220 recover after the output pin is shorted to GND? Would the short circuit damage the Vout pin and render the IC useless? For the application, there is a possibility of the Vout pin hitting GND potential.
    on Mar 7, 2011

  • Forum Post: Re: tps61220 regulating input voltage

    Chris Glaser
    Can you post a full schematic of your circuit? Also, I will need to know how the circuit is behaving and how this is different than what you expected.
    on Mar 11, 2011

  • Forum Post: TPS61220 vout too low

    Daniel Blackmer
    I am working on a power supply circuit, and am using a TPS61220 as one of the powering methods. Now the fact that its only one section of the power supply is less important, because even the fabricated test boards that have been made with just the charge pump have the same behavior. We are looking for...
    on Jun 23, 2011

  • Forum Post: Re: TPS61220 with bizarre behavior

    Chris Glaser
    It sounds like noise is getting into your circuit. Could you post your schematic and layout? Even though it is similar to the datasheet, small changes can have a drastic impact on performance. Also, how are you driving the EN pin? What voltage is it at? Could you send a scope capture of Vin, Vout...
    on Jun 23, 2011

  • Forum Post: TPS61222 stability with supercapacitor on output

    Dan-o
    I have a circuit still in design which uses a TPS61222. CIN = 10uF, L = 10uH, COUT = 10U, with an additional 47mF supercapacitor on the output. The main purpose of this circuit is to charge a supercap for backup supply. There will be no load other than the supercap when the TPS61222 is first enabled...
    on Sep 9, 2011

  • Forum Post: Re: Coin Cell Power for MSP430

    Chris Glaser
    I believe the TPS61097-33 is perfect for this application. There is a 3V version in work. Another option is the TPS61220. Either solution allows you to increase the battery life of your system by drawing all the power out of your battery, even at its lower voltages. With a fresh battery, the switcher...
    on Nov 17, 2011

  • Forum Post: Limiting inrush current in TPS61220 family

    Ryan Aylward
    I am testing a new design using the TPS61222 to generate 5V from a 2AA battery pack. The 5V rail is only required for a subsystem containing LEDs - the MCU runs directly off the battery. When the regulator is enabled in order to supply power to the 5V subsystem, an inrush current of up to 200mA is possible...
    on Nov 21, 2011

  • Forum Post: Re: Limiting inrush current in TPS61220 family

    Chris Glaser
    The TPS61220 has a key feature that greatly affects the inrush current--it has a diode connecting L to Vout even when it is off. So, you cannot stop the inrush occurringthrough this diode. Is this desired for your system? Since you are simply driving LEDs, I would expect this to be undesirable since...
    on Nov 21, 2011

  • Forum Post: TPS61220 for charging a battery from piezo electric source

    jairam surya
    I am working on piezoelctric energy harvesting, am using TPS61220 to provide constant DC supply to the battery. The output from the piezo transducer is given to bridge rectifier which is in turn given to dc-dc converter and to which a battery is connected. For testing the dc-dc converter am using TPS61220EVM...
    on Dec 27, 2011

  • Forum Post: Re: usage of TPS61220 for charging a battery.

    jairam surya
    Yes sir the piezoelectric is unable to supply the sufficient power to drive the converter. Am able to charge a capacitor with the incoming piezoelectricity . When am connecting the charged capacitor to converter it is working fine. But when the capacitor is connected to converter and am trying to charge...
    on Dec 29, 2011

  • Forum Post: TPS61222 drawing excessive current

    CF
    Hi, I am using a TPS61222, on the VIN part I have a 3V battery and expecting 5V on the VOUT. The problem I am experiencing is that if I put the device to a DC Power Supply at 3V (Simulating a battery), the DC power supply shows that it's drawing 250mA which would drain my battery in an extremely...
    on Jan 11, 2012

  • Wiki Page: TPS61220 Minimum Output Voltage

    Michael Day
    Q: TPS61220 Minimum Output Voltage by 1879511 Can the TPS61220 be used for output voltage = 1.2V? The specs mention 1.8V vout min, while the FB voltage is 0.5V and Vin Min is 0.7V. Can Vout be 1.2V? What is the limitation? Regards, Denislav A: Re: TPS61220 Minimum Output Voltage...
    on Mar 2, 2012

  • Forum Post: Re: Cant explain current drop in TPS61220

    Michael Day
    It is important for you to remeasure your voltages and currents. I do not understand how you can have 3.5V across a 100 ohm resistor and only get 300mA through it. The equation V=IR must be valid. Also be aware that if you have a 3.5V @ 300ma source which is 1.05V and get a 5V @ 200mA = 1.00W, it requires...
    on Mar 27, 2012

  • Forum Post: RE: TPS61222: Output voltage @ shutdown mode ?

    Chris Glaser
    Yes, you can drive the EN pin from an external PWM signal on many of our parts. Note that due to the softstart time of the particular IC, it may not behave the same way a simple switch does. We do have a broad portfolio of small power switches that do exactly what you need. You can post in the power...
    on Apr 30, 2012
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