AQ1117CY-M1-25-TRL

AQ1117 Low Dropout 1 Amp Voltage Regulator Product Specification Revision 1.5 September 19, 2005 General Description The AQ1117 is a low dropout three terminal voltage regulator, offered in popular fixed options or an adjustable version that can set a precise voltage from 1.22V to 12V with two external resistors. AQ1117 is offered in SOT-89 which has a lower thermal resistance and fits in smaller foot print than a standard SOT-223. With a dropout voltage of less than one volt, the AQ1117 can be used in applications where drop out voltage and size are an issue. To assure accuracy within 1.5% over temperature the heart of the AQ1117 is a selfcorrecting AcuRef™ bandgap reference. On-chip current limit and thermal shutdown with hysteresis protects against any combination of overload and ambient temperature that might cause the junction temperature to exceed safe limits. Applications • Graphic cards • PC motherboards • Switching power supply post-regulation • Telecom equipment • DVD video player Features • Featured in small SOT- 89 package • Vout tolerance 1.5% over temperature • Stable with low cost 1uF capacitor • Low dropout voltage (1V at 1 Amp) • Thermal protection with hysteresis • Short circuit protection • Offered with 1.8V, 2.5V, and 3.3V fixed or • adjustable output RoHS complaint available Typical Application www.acutechnology.com AQ1117 Acutechnology Semiconductor Inc. AQ1117 Pin Configuration SOT-89 Pin Descriptions Pin Name VIN VOUT Ground/Adjust Function Accepts + VCC Regulated Output - VCC for fixed option / Adjust pin for adjustable option Functional Block Diagram www.acutechnology.com 2 Rev. 1.5 September 20, 2005 Acutechnology Semiconductor Inc. AQ1117 Ordering Information Device AQ1117 AQ1117 AQ1117 AQ1117 AQ1117 AQ1117 AQ1117 AQ1117 Note: The Operating Tj 0C˚ ≤ 125C˚ 0C˚ ≤ 125C˚ 0C˚ ≤ 125C˚ 0C˚ ≤ 125C˚ 0C˚ ≤ 125C˚ 0C˚ ≤ 125C˚ 0C˚ ≤ 125C˚ 0C˚ ≤ 125C˚ %Tol 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 PKG Type SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 SOT-89-3 VOUT 1.8V 1.8V 2.5V 2.5V 3.3V 3.3V ADJ ADJ Wrap T&R T&R T&R T&R T&R T&R T&R T&R Ordering Number AQ1117CY-M1-18-TR AQ1117CY-M1-18-TRL AQ1117CY-M1-25-TR AQ1117CY-M1-25-TRL AQ1117CY-M1-33-TR AQ1117CY-M1-33-TRL AQ1117CY-M1-AJ-TR AQ1117CY-M1-AJ-TRL TRL parts are Lead Free and RoHS compliant. Absolute Maximum Ratings Stress greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These stress ratings only, and functional operation of the device at these or any conditions beyond those indicated under recommended Operating Conditions is not implied. Exposure to “Absolute Maximum Rating” for extended periods may affect device reliability. Use of standard ESD handling precautions is required. Parameter Maximum VIN Power Dissipation (Internally limited) Maximum Junction Temperature Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 4sec.) SOT packages 150 0 to 125 -65 to 150 300 °C °C °C °C Value 18 Units Volts Thermal Management Thermal Resistance (Junction to Tab) SOT-89 Typical Value 10 Units °C/W Thermal Resistance (Junction to Ambient) SOT-89 (tab soldered to 1 in2 1 oz. copper PCB) Typical Value 30 Units °C/W www.acutechnology.com 3 Rev. 1.5 September 20, 2005 Acutechnology Semiconductor Inc. AQ1117 Electrical Specifications Electrical characteristics are guaranteed over the full temperature range 0ºC 1000uF) and the input is instantaneously shorted to ground, can damage occur. 5. Thermal Considerations When an integrated circuit operates with an appreciable current, its junction temperature is elevated. It is important to quantify its thermal limits in order to achieve acceptable performance and reliability. This limit is determined by summing the individual parts consisting of a series of temperature rises from the semiconductor junction to the operating environment. The heat generated at the device junction flows through the die to the die attach pad, through the lead frame to the surrounding case material, to the printed circuit board, and eventually to the ambient environment. The AQ1117 regulators have internal thermal shutdown to protect the device from overheating. Under all possible operating conditions, the junction temperature of the AQ1117 must be lower than 125°C. A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. To determine if a heatsink is needed, the power dissipated by the regulator, PD, must be calculated: PD= (VIN-VOUT) IL where the IL is the load current. The next parameter which must be calculated is the maximum allowable temperature rise, T(max): T(max)=TJ(max)-TA(max) where TJ(max) is the maximum allowable junction temperature (125°C), and TA(max) is the maximum ambient temperature which will be encountered in the application. Using the calculated values for T(max) and PD, the maximum allowable value for the junction to ambient thermal resistance (θJA) can be calculated: θJA=T(max)/ PD If the maximum allowable value for θJA is found to be greater than the junction to ambient thermal resistance for the package used, no heatsink is needed since the package alone will dissipate enough heat to satisfy these requirements. www.acutechnology.com 6 Rev. 1.5 September 20, 2005 Acutechnology Semiconductor Inc. AQ1117 Package Dimensions SOT-89 Contact Information Acutechnology Semiconductor Inc. 3487 McKee Rd. Suite 52 San Jose CA , USA 95127 Disclaimer The information furnished by Acutechnology in this data sheet is believed to be accurate and reliable. However, Acutechnology assumes no responsibility for its use. Acutechnology reserves the right to change circuitry and specifications at any time without notification to the customer. TEL: FAX: website: (408) 259-2300 (408) 259-9160 www.acutechnology.com Life Support Policy Acutechnology Products are not designed or authorized for use as components in life support devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. AcuRef is a trademark of Acutechnology Semiconductor Inc www.acutechnology.com 7 Rev. 1.5 September 20, 2005