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AAT3237IGU-1.8-T1 Datasheet(PDF) 10 Page - Advanced Analogic Technologies |
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AAT3237IGU-1.8-T1 Datasheet(HTML) 10 Page - Advanced Analogic Technologies |
10 / 13 page AAT3237 300mA MicroPower™ LDO with PowerOK 10 3237.2006.01.1.4 POK Output The AAT3237 features an integrated Power-OK comparator which can be used as an error flag. The POK open-drain output goes low when OUT is 6% below its nominal regulation voltage. Connect a pull-up resistor from POK to OUT. Enable Function The AAT3237 features an LDO regulator enable/ disable function. This pin (EN) is active high and is compatible with CMOS logic. To assure the LDO regulator will switch on, the EN turn-on control level must be greater than 2.0V. The LDO regulator will go into the disable shutdown mode when the volt- age on the EN pin falls below 0.6V. If the enable function is not needed in a specific application, it may be tied to V IN to keep the LDO regulator in a continuously on state. When the LDO regulator is in shutdown mode, an internal 1.5k Ω resistor is connected between V OUT and GND. This is intended to discharge C OUT when the LDO regulator is disabled. The internal 1.5k Ω has no adverse effect on device turn-on time. Short-Circuit Protection The AAT3237 contains an internal short-circuit pro- tection circuit that will trigger when the output load current exceeds the internal threshold limit. Under short-circuit conditions, the output of the LDO reg- ulator will be current limited until the short-circuit condition is removed from the output or LDO regu- lator package power dissipation exceeds the device thermal limit. Thermal Protection The AAT3237 has an internal thermal protection cir- cuit which will turn on when the device die tempera- ture exceeds 145°C. The internal thermal protection circuit will actively turn off the LDO regulator output pass device to prevent the possibility of over-temper- ature damage. The LDO regulator output will remain in a shutdown state until the internal die temperature falls back below the 145°C trip point. The combination and interaction between the short- circuit and thermal protection systems allows the LDO regulator to withstand indefinite short-circuit conditions without sustaining permanent damage. No-Load Stability The AAT3237 is designed to maintain output volt- age regulation and stability under operational no- load conditions. This is an important characteristic for applications where the output current may drop to zero. Reverse Output-to-Input Voltage Conditions and Protection Under normal operating conditions, a parasitic diode exists between the output and input of the LDO regulator. The input voltage should always remain greater than the output load voltage, main- taining a reverse bias on the internal parasitic diode. Conditions where V OUT might exceed VIN should be avoided since this would forward bias the internal parasitic diode and allow excessive current flow into the V OUT pin, possibly damaging the LDO regulator. In applications where there is a possibility of V OUT exceeding V IN for brief amounts of time during nor- mal operation, the use of a larger value C IN capaci- tor is highly recommended. A larger value of C IN with respect to C OUT will effect a slower CIN decay rate during shutdown, thus preventing V OUT from exceeding V IN. In applications where there is a greater danger of V OUT exceeding VIN for extended periods of time, it is recommended to place a Schottky diode across V IN to VOUT (connecting the cathode to V IN and anode to VOUT). The Schottky diode forward voltage should be less than 0.45V. |
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