Electronic Components Datasheet Search |
|
GM6155-5.0ST25R Datasheet(PDF) 5 Page - Gamma Microelectronics Inc. |
|
GM6155-5.0ST25R Datasheet(HTML) 5 Page - Gamma Microelectronics Inc. |
5 / 9 page 5 Applications Information Enable/ Shutdown Forcing EN (enable/ shutdown) high (>2V) enables the regulator. EN is compatible with CMOS logic gates. If enable shutdown feature is not required, connect EN (pin 3) to IN (supply input, pin 1). See Figure 3. Input Capacitor A 1µF capacitor should be placed from IN to GND if there is more than 10 inches of wire between the input and the acfilter capacitor or if a battery is used as the input . Reference Bypass Capacitor BYP (reference bypass) is connected to the internal voltage reference. A 470pF capacitor (C ) connected BYP from BYP to GND quiets this reference, providing a significant reduction in output noise. C reduces the BYP regulator phase margin, when using C , output capacitors of 2.2µF or greater are generally required to BYP maintain stability. The start-up speed of GM6155 is inversely proportional to the size of the reference bypass capacitor. Applications requiring a slow ramp-up of output voltage should consider larger values of C . Likewise, if BYP rapid turn-on is necessary, consider omitting C . BYP If output noise is not a major concern, omit C and leave BYP open. BYP Output Capacitor An output capacitor required between OUT and GND to prevent oscillation. The minimum size of the output capacitor is dependent upon whether a reference bypass capacitor is used. 1.0µF minimum is recommended when C is not used (see Figure 2). 2.2µF minimum is recommended when C is 470pF (see Figure 1). BYP BYP Larger values improve the regulator's transient response, the output capacitor value may be increased without limit. The output capacitor should have an ESR (effective series resistance) of about 5W or less and a resonant frequency above 1MHz. Ultra-low-ESR capacitors can cause a low amplitude oscillation on the output and/ or underdamped transient response. Most tantalum or aluminum electrolytic capacitors are adequate; film types will work, but more expensive. Since many aluminum electrolytics have electrolytes that freeze at about -30°C, solid tantalums ate recommended for operation below -25°C. At lower values for output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.47µF for current below 10mA or 0.33µF for current below 1mA. No-Load Stability GM6155 will remain stable and in regulation with no load (other than the internal voltage divider) unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations Gm6155 is designed to provide 150mA of continuous current in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation: T is the maximum junction temperature of the die, 125°C, and T is the ambient operating temperature. J(max) A R is layout dependent; Table 1 shows examples of junction-to-ambient thermal resistance for the GM6155. qJA P = D(max) (T - T ) J(max) A JA Rq |
Similar Part No. - GM6155-5.0ST25R |
|
Similar Description - GM6155-5.0ST25R |
|
|
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 |