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AAT3216IJS-3.5-T1 Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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AAT3216IJS-3.5-T1 Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
10 / 16 page AAT3216 150mA MicroPower™ LDO with PowerOK 10 3216.2004.01.0.94 Applications Information Consult capacitor vendor data sheets carefully when selecting capacitors for LDO regulators. POK Output The AAT 3216 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 or IN. A delayed POK signal can be implemented with a capacitor in parallel with the pull-up resistor. Enable Function The AAT3216 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 2.0 volts. The LDO regulator will go into the disable shutdown mode when the voltage on the EN pin falls below 0.6 volts. If the enable function is not needed in a specific applica- tion, it may be tied to VIN to keep the LDO regula- tor in a continuously on state. When the LDO regulator is in the shutdown mode, an internal 1.5k Ω resistor is connected between VOUT and GND. This is intended to discharge COUT when the LDO regulator is disabled. The internal 1.5k Ω has no adverse effect on device turn on time. Short Circuit Protection The AAT3216 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 regu- lator 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 AAT3216 has an internal thermal protection cir- cuit which will turn on when the device die temper- ature exceeds 150°C. The internal thermal protec- tion circuit will actively turn off the LDO regulator output pass device to prevent the possibility of over temperature damage. The LDO regulator output will remain in a shutdown state until the internal die temperature falls back below the 150°C trip point. The combination and interaction between the short circuit and thermal protection systems allow the LDO regulator to withstand indefinite short circuit conditions without sustaining permanent damage. No-Load Stability The AAT3216 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 then the output load voltage main- taining a reverse bias on the internal parasitic diode. Conditions where VOUT might exceed VIN should be avoided since this would forward bias the internal parasitic diode and allow excessive current flow into the VOUT pin possibly damaging the LDO regulator. In applications where there is a possibility of VOUT exceeding VIN for brief amounts of time during nor- mal operation, the use of a larger value CIN capaci- tor is highly recommended. A larger value of CIN with respect to COUT will effect a slower CIN decay rate during shutdown, thus preventing VOUT from exceeding VIN. In applications where there is a greater danger of VOUT exceeding VIN for extended periods of time, it is recommended to place a schot- tky diode across VIN to VOUT (connecting the cath- ode to VIN and anode to VOUT). The Schottky diode forward voltage should be less than 0.45 volts. Thermal Considerations and High Output Current Applications The AAT3216 is designed to deliver a continuous output load current of 150mA under normal operat- ing conditions. |
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