Electronic Components Datasheet Search |
|
MP3120 Datasheet(PDF) 7 Page - Monolithic Power Systems |
|
MP3120 Datasheet(HTML) 7 Page - Monolithic Power Systems |
7 / 10 page MP3120-1.2A, 1.1MHz SYNCHRONOUS BOOST MP3120 Rev. 0.93 www.MonolithicPower.com 7 9/20/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. Current Sensing Lossless current sensor converts the N-MOS switch current signal to a voltage signal and it is summed with the internal slope compensation. The summed signal is compared with the error amplifier output to provide a series of PWM signal. The current limit threshold is about 1.2A which is independent of input and output voltage. The switch current signal is blanked for 60ns to enhance noise rejection. Synchronous Rectifier The P-MOS synchronous rectifier is only enabled when VOUT > (VIN + 0.1V) and the FB pin is above 800mV. Thermal Shutdown An internal temperature monitor will start to reduce the peak current limit if the die temperature exceeds 125ºC. If the die temperature continues to rise and reaches to 160ºC, the part will thermally shutdown, all switches will be turned off. The part will be enabled again when the die temperature drops by about 20ºC. Output Disconnect and Inrush Current Limiting The MP3120 is designed to allow true output disconnect by eliminating body diode conduction of the internal PMOS rectifier. This allows VOUT to go to zero volts during shutdown, and drawing zero current from the input source. It also allows for inrush current limiting during start-up, minimizing surge currents from the input. Note that to obtain the advantage of output disconnect, there must be no external schottky diode connected between the SW pin and OUT pin. Board layout is extremely critical to minimize voltage spike on SW pin caused by stray inductance. Keep the output filter capacitors as close as possible to the OUT pin and use very low ESR/ESL ceramic capacitors tied to a good ground plane. Short Circuit Protection Unlike most boost converters, the MP3120 allows the output to be short circuit due to the output disconnect feature. The device incorporates internal features such as current limit feedback, thermal regulation and thermal shutdown to prevent the chip from burning out caused by excessive overload or short circuit. In the event of a short circuit, the current limit reduces to a smaller value. The thermal protection circuit also functions in addition to the current limit in case of the device temperature rise up to above 125ºC. VOUT< VIN Operation The MP3120 maintains the output voltage to be regulated even if the input voltage is above the output voltage. In this mode the P-MOS no longer acts as a low impedance switch, there will be more power dissipation within the IC. This will cause a sharp drop in the efficiency. The maximum output current should be limited in order to maintain an acceptable junction temperature. |
Similar Part No. - MP3120 |
|
Similar Description - MP3120 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |