AQ533CY-M5-33-TR

AQ533 Ultra-Low Dropout 500mA Voltage Regulator Product Specification Revision 1.7 September 13, 2006 General Description The AQ533 is an ultra-low dropout voltage regulator capable of delivering 500 mA to the load. It is adjustable and can set a precise voltage from 1.22V to 12V with two external resistors. The AQ533 meets all specifications down to 1.22V output, unlike CMOS LDO’s which loose performance with outputs below 2.25V. The enable pin provides a remote turn-off for low power consumption. It draws virtually zero current in shutdown mode and implements Sequential, Ratiometric, or Simultaneous sequencing schemes. This also allows for a separate bias connection from the pass transistor in order to achieve ultra low dropout from VIN to VOUT. Reverse current protection blocks current flowing from VOUT to VIN when the AQ533 is disabled. No current flows. To assure accuracy within 1.5% over temperature, the heart of the AQ533 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 • Cell Phones • DVD video player Features • Low dropout voltage (350mV at 500 mA) • Enable pin implements sequencing • Reverse current protection • Vout tolerance less than 1.5% over • • • • • • temperature Featured in the very small SOT-23 package Stable with low cost 1µF capacitor Low ground current (0.95V + VOUT), Chip bias circuit supply OFF low, ENABLE < 0.25V Adjust input. Connect to resistive feed back divider. Regulated Output Functional Block Diagram www.acutechnology.com 2 Rev. 1.7 September 13, 2006 Acutechnology Semiconductor Inc. AQ533 Ordering Information Device AQ533 AQ533 AQ533 AQ533 AQ533 AQ533 AQ533 AQ533 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-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 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 AQ533CY-M5-18-TR AQ533CY-M5-18-TRL AQ533CY-M5-25-TR AQ533CY-M5-25-TRL AQ533CY-M5-33-TR AQ533CY-M5-33-TRL AQ533CY-M5-AJ-TR AQ533CY-M5-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 Maximum VENABLE Power Dissipation (Internally limited) Maximum Junction Temperature Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 4 sec.) SOT- 23-5 package 150 0 to 125 -65 to 150 300 °C °C °C °C Value 18 18 Units Volts Volts Thermal Management Thermal Resistance (Junction to Ambient) SOT-23-5 (minimum foot print) Typical Value 220 Typical Value 170 Units °C/W Units °C/W Thermal Resistance (Junction to Ambient) SOT-23-5 (Soldered to 1 in2 1 oz. copper PCB) www.acutechnology.com 3 Rev. 1.7 September 13, 2006 Acutechnology Semiconductor Inc. AQ533 Electrical Specifications Electrical characteristics are guaranteed over the full temperature range 0ºC 0.95V + VOUT, will insure Ultra-low drop out voltage (350mV@ 500mA) from VIN to VOUT. Or, Enable, tied to Vin will support a low drop out voltage (0.95V). 2. Stability An Enable capacitor is recommended. A 100nF capacitor is a suitable input bypass for almost all applications. A larger capacitor is also suitable depending on the cleanliness of the Enable source. A Vin Capacitor is also recommended. A 1µF capacitor is a bypassing for almost all applications. A larger capacitor is also suitable depending on the cleanliness of the VIN source. The Output capacitor is critical in maintaining regular stability. The AQ533 is stable with an output capacitor greater than 1µF. Any increase of the output capacitor will merely improve the loop stability and the load transient response. Tantalum Capacitors exhibit the best stability over a wide range of loads and are recommended. 3. Output Voltage The AQ533 meets all specifications down to 1.22V output. It does not suffer from performance degradation issues such as experienced with CMOS LDO’s. Drop out voltage will be less than 350 mV at 500 mA load with the ENABLE pin held greater than 0.95V + Vout, The AQ533 develops a 1.22V reference voltage between the adjust pin terminal and ground. This voltage is applied across the resistor R2 to generate a constant current (I2). The current www.acutechnology.com 6 Rev. 1.7 September 13, 2006 Acutechnology Semiconductor Inc. AQ533 from the adjust terminal could introduce error to the output, but since it is very small (0.95V + Vout. This results in a dropout of 350 mV at 500 mA of load current, between Vin and VOUT. This feature is important when the supply voltage is dropping near the output regulated voltage. Furthermore if the voltage dropout is low, the internal power dissipation is also reduced and the thermal requirements of the device are less stringent. www.acutechnology.com 8 Rev. 1.7 September 13, 2006 Acutechnology Semiconductor Inc. AQ533 Package Dimensions www.acutechnology.com 9 Rev. 1.7 September 13, 2006 Acutechnology Semiconductor Inc. AQ533 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 10 Rev. 1.7 September 13, 2006