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| AQ120 LDO Regulator Controller SOT23-5 Package Preliminary Specification Revision 1.2 April 1, 2006 General Description The AQ120 is a low cost LDO controller. The AQ120 flexibility allows the setting of the output voltage and controls up to 2 Amps of output current with a minimum number of external components. The open collector output is capable of driving an external PNP transistor. A temperature stable bandgap reference (1.25 V) controls the output voltage and is programmable through two external resistors. The AQ120 if offered in the very small SOT23-5 package. Applications * Graphic cards * PC motherboards * Switching power supply post-regulation * Telecom equipment * DVD video player Features * 1.25V reference with 1.5% accuracy * Low current consumption * Offered in small SOT23-5 package * Wide Vin range: 2.5V to 18V * 20mA drive current sink * RoHS compliant available Pin Configuration Block Diagram www.acutechnology.com AQ120 Acutechnology Semiconductor Inc. AQ120 Typical Application Note: The values of R1and R2 set the output voltage. The typical Vref is 1.25V Pin Descriptions Pin 1 2 3 4 5 Pin Name DRIVE GND GND BIAS VCC VREF Function Output of error amplifier. 20 mA sink capability to drive PNP pass element Ground Must connect to GND for proper operation as an LDO Controller Positive supply Voltage programming pin; has a threshold of 1.25V. Ordering Information Device AQ120 AQ120 Note: The Operating Tj -40C 85C -40C 85C %Tol 1.5 1.5 Pkg Type SOT-23-5 SOT-23-5 VOUT 1.25V 1.25V Wrap T&R T&R Order Number AQ120EX-M5-AJ-TR AQ120EX-M5-AJ-TRL TRL parts are Lead Free and RoHS compliant. 2 Rev. 1.2 April 1, 2006 www.acutechnology.com Acutechnology Semiconductor Inc. AQ120 Absolute Maximum Ratings Parameter VCC Voltage DRIVE Voltage REF Voltage VCC, DRIVE, REF Current Operating Junction Temperature Lead Temperature (soldering 10 seconds) Storage Temperature Range Value 18 18 18 50 150 300 -80 to +150 Units V V V mA C C C Electrical Specifications Electrical characteristics are guaranteed over the full temperature range -40C 3 Rev. 1.2 April 1, 2006 Acutechnology Semiconductor Inc. AQ120 APPLICATION (Figure 1) GENERAL DESCRIPTION The AQ120 is a linear LDO voltage regulator controller. It drives a discrete PNP transistor while comparing the output to a 1.25V reference. The output voltage is programmable through an external resistor divider. VOUT can be set to any value above 1.25 Volts. The collector of the external PNP transistor provides the output current to the load. Vin range is 2.5V to 18V. The Maximum Load current is Beta of the PNP times IDRIVE. IDRIVE range is 0.1 mA to 20 mA (max). SETTING THE OUTPUT VOLTAGE The AQ120 VREF pin is the input to an amplifier comparing to a precision 1.25V reference. With VREF tied back to the output, it will drive the base of the external PNP to maintain output voltage with changing load current and VCC. The regulated output voltage can be set by selecting the proper ratio of R1 and R2. The Output Voltage is set by: Vout = VREF R1 + R 2 = 1.25V 1 + R1 R2 R2 ( ) Rev. 1.2 April 1, 2006 www.acutechnology.com 4 Acutechnology Semiconductor Inc. SELECTION OF PNP PASS DEVICE AQ120 In the application of (figure 1) above, an FMMT549 SOT223 package was used. However, selection of the PNP pass device is based on Vin max, Iout max, and Power dissipation for your particular application. VIN max BVCEO and BVCBO minimum rating of the PNP transistor must exceed the maximum Vin of the application. The AQ120 will stand off 18V max. Therefore the maximum voltage the PNP will experience is 18V. Iout max Beta of the PNP transistor will dictate the maximum output current as per the equation: Iout max = Idrive max(20mA) BetaExt.PNP Higher beta of the PNP will improve the Vout variation due to change in load (load reg.) Minimizing the Idrive required will also minimize the Load reg. as Vout will decrease by .15% per mA of Idrive. Therefore, delta 10mA of Idrive will cause a delta 1.5% of Vout. Power dissipation Selection of the external PNP package is based on size requirements and power dissipation. Consult the transistor data sheet for power considerations. 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. www.acutechnology.com 5 Rev. 1.2 April 1, 2006 Acutechnology Semiconductor Inc. AQ120 Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6 www.acutechnology.com 6 Rev. 1.2 April 1, 2006 |
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