 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
AME8844BEQAADJ Datasheet(PDF) 7 Page - Analog Microelectronics |
|
||||||||||||||||||||||||||||||
AME8844BEQAADJ Datasheet(HTML) 7 Page - Analog Microelectronics |
|
|
7 / 15 page  AME, Inc. 7 AME8844 750mA CMOS LDO Rev.E.01 The AME8844 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal pro- tection circuits. During normal operation, the error ampli- fier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits become ac- tive when the junction temperature exceeds 140oC, or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC. The AME8844 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3 ohms, the current drops back to 600mA to prevent excessive power dissipation. Normal operation is restored when the load resistance exceeds 0.75 ohms. n Detailed Description n External Capacitors The AME8844 is stable with an output capacitor to ground of 4.7 µF or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Con- versely, Aluminum Electrolytic capacitors exhibit the high- est ESR, resulting in the poorest AC response. Unfortu- nately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1 µF ceramic capacitor with a 10 µF Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the in- put and ground to stabilize Vin. The input capacitor should be at least 0.1 µF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection. n Enable When EN pin is pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 2 µA. This pin behaves much like an electronic switch. 100K ohms resistor is necessary between V EN source and EN pin when V EN is higher than VIN. n Adjustable Version The adjustable version uses external feedback resis- tors to generate an output voltage anywhere from 1.5V to 5.0V. Vadj is trimmed to 1.24V and VOUT is given by the equation: VOUT = Vadj ( 1 + R1 / R2 ) Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1 + R2 will reduce stability. In general, R1 and R2 in the 10 of s k Ω will produce adequate stability, given reasonable lay- out precautions. To improve stability characteristics, keep parasitics on the ADJ pin to a minimum, and lower R1 and R2 values. n Power Good The AME8844 includes the Power Good feature. When the output is not within ? 5% of the specified voltage, it pulls low. This can occur under the following conditions: 1) Input Voltage too low. 2) During Over-Temperature. 3) During Over-Current. 4) If output is pulled up. (Note: PG pin is an open-drain output.) (Note: There is no internal pull-up for EN pin. It can not be floating) |
Similar Part No. - AME8844BEQAADJ |
|
Similar Description - AME8844BEQAADJ |
|
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
