Liteon Semiconductor Corporation LSP1117 1A Low Dropout Linear Regulator

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Collin Miles Anthony
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1 FEATURES 1.4 maximum dropout at full load current Fast transient response Output current limiting Built-in thermal shutdown Good noise rejection Low ESR Ceramic Capacitor(MLCC) Required for Stability APPLICATIONS PC Motherboard LCD Monitor Graphic Card DD-video player NIC/Switch Telecom Equipment ADSL Modem Printer and other Peripheral Equipment GENERAL DESCRIPTION The is a series of low dropout three-terminal regulators with a dropout of 1.4 at 1A output current. The series provides current limiting and thermal shutdown. Its circuit includes a trimmed bandgap reference to assure output voltage accuracy to be within 2% for 1.2, 1.5, 1.8, 2.5, 3.3., 5.0 and adjustable versions. Current limit is trimmed to ensure specified output current and controlled short-circuit current. On-chip thermal shutdown provides protection against any combination of overload and ambient temperature that would create excessive junction temperature. The has an adjustable version that can provide the output voltage from 1.2 to 18 with only two external resistors. The series is available in the industry standard TO252-3L and SOT223 power packages. PIN CONFIGURATION (1) TO252-3L (2) SOT223 3 IN 3 IN 2 OUT 2 OUT 1 ADJ/GND 1 ADJ/GND BLOCK DIAGRAM Metal Tab OUT Metal Tab OUT 3 INPUT Thermal Protection OUTPUT For Adjustable Output, disconnect A1 and A2, connect B For Fixed Output,connect A1 and A2, disconnect B A1 A2 B 1 ADJ/GND 1/9

2 ABSOLUTE MAXIMUM RATINGS (NOTE 1) Symbol Parameter Rating Unit IN Input oltage 23 T J Maximum Junction Temperature 150 T S Storage Temperature -65~150 T LEAD Lead Temperature (10 sec.) 300 ESD ESD (Machine Model) 600 Note 1: Stresses greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress rating only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Rating Unit IN Input oltage 20 T J Operating Junction Temperature Range -40~125 ELECTRICAL CHARACTERISTICS Operating Conditions: IN 10, T J =25, unless otherwise specified Parameter Symbol Test Condition Min. Typ. Max. Unit Reference I O =10mA, IN - OUT = oltage REF -Adj I O =10mA,1.5 IN - OUT I O =10mA, IN = I O =10mA, 3 IN I O =10mA, IN = I O =10mA, 3 IN Output oltage OUT -1.8 I O =10mA, IN = I O =10mA, 3.3 IN I O =10mA, IN = I O =10mA, 4 IN I O =10mA, IN = I O =10mA, 4.8 IN I O =10mA, IN = I O =10mA, 6.5 IN Line Regulation Reg LINE -XXX I O =10mA,1.5 IN - OUT % I O =10mA,1.5 IN - OUT % -Adj IN= 3, 10mA<Io<1A 1 % -1.2 IN= 3, 10mA<Io<1A m -1.5 IN= 3, 10mA<Io<1A m Load Regulation Reg Load -1.8 IN= 3.3, 10mA<Io<1A m -2.5 IN= 4, 10mA<Io<1A m -3.3 IN= 5, 10mA<Io<1A m -5.0 IN= 6.5, 10mA<Io<1A m Dropout oltage IN - OUT -XXX IOUT = 1A, OUT=1%OUT Current Limit I LIMT -XXX IN - OUT =3 1.1 A Ripple Rejection -XXX F=120Hz,COUT=25uF Tantalum, IN - OUT = db Temperature Stability -XXX IO=10mA 0.5 % 2/9

3 ELECTRICAL CHARACTERISTICS (CONTINUED) Operating Conditions: IN 10, T J =25, unless otherwise specified Parameter Symbol Test Condition Min. Typ. Max. Unit Adjust Pin Current I O =10mA~1A, 1.5 IN - OUT µa Adjust Pin Current Change I O =10mA~1A, 1.4 IN - OUT µa Minimum Load Current(ADJ) E ma 1.5 IN - OUT ma Quiescent Current Iq IN = OUT ma Long-term Stability T A =125, 1000hrs 0.3 % RMS Output Noise (% of OUT ) T A =25, 10Hz f 10kHz % Power Dissipation Pd TO252-3L 1.2 SOT W Thermal Resistance, TO252-3L 83 / Junction to Ambient JA W No heat sink, No air flow) SOT Thermal Resistance, TO252-3L 10 / Junction to case JC SOT W Thermal Shutdown Junction Temperature 150 Thermal Shutdown Hysteresis 25 TYPICAL APPLICATIONS -ADJ in 4.7uF in ADJ out R1 4.7uF out R2 out=ref*(1+r2/r1); ref=1.25; The keeps a constant 1.25 between the output pin and the adjust pin. By placing a resistor R1 across these two pins a constant current flows through R1, adding to the Iadj current and into the R2 resistor producing a voltage equal to the (1.25/R1)*R2+Iadj*R2 which will be added to the 1.25 to set the output voltage. This is summarized in the above equation. Since the minimum load current requirement of the is 10mA, R1 is typically selected to be 121Ω resistor so that it automatically satisfies the minimum current requirement. Notice that since Iadj is typically in the range of 50uA it only adds a small error to the output voltage and should only be considered when a very precise output voltage setting is required. For example, in a typical 3.3 application where R1=121Ω and R2=200Ω the error due to Iadj is only 0.3% of the nominal set point. in=7 10uF in out GND + 22uF 5 at 1A 3/9

4 TYPICAL PERFORMANCE CHARACTERISTICS Dropout oltage () Dropout oltage vs Output Current T A =0 T A =25 T A = Output Current (A) Reference oltage () Reference oltage vs Junction Temperature Junction Temperature ( ) Minimum Load Current vs Junction Temperature 5 Adjust Pin Current vs Junction Temperature 90 Minimum Load Current (ma) Junction Temperature ( ) Adjust Pin Current (µa) Junction Temperature ( ) 4/9

5 TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED) Short-Circuit Current vs Junction Temperature Maximum Power Dissipation Short-Circuit Current (A) Power (W) SOT Junction Temperature ( ) Case Temperature ( Line Transient Response Load Transient Response Ripple Rejection vs Frequency 70 Ripple Rejection (db) k 10k 100k Frequency (Hz) 5/9

6 ORDERING INFORMATION MARKING INFORMATION (1) TO252-3L (2) SOT223 6/9

7 PACKAGE INFORMATION (1) TO252-3L E b2 5.6 D L2 L b e 1.2 e1 Land Pattern Recommendation (Unit : mm) Notes: 1. JEDEC Outline:TO-252 AB 2. Mils suggested for positive contact at mounting Symbol Dimensions In Millimeters Dimensions In Inches Min. Nom. Max. Min. Nom. Max. A A b 0. 61TYP TYP. b C C D E e 2.25BSC BSC. e1 4.50BSC BSC. H L L L /9

8 (2) SOT223 D B1 3.3 K 1.6 H E e 2.3 ß e1 Land Pattern Recommendation (Unit :mm) A1 A B a L Seating Plane C ß Symbol Dimensions In Millimeters Dimensions In Inches Min. Nom. Max. Min. Nom. Max. A A B B (Ref.) (Ref.) c D E e 2.3Basic 0.091Basic e1 4.6Basic 0.181Basic H L K α 0 ο 5 ο 10 ο 0 ο 5 ο 10 ο β 13 ο 13 ο 8/9

9 UPDATE HISTORY Date ersion Descriptions Add 1.2 output version; Revise temperature to -20~125 ; Revise in from to 20 (By Fredwu); Change max power dissipation and θ JA (By Fredwu); 9/9

FAN1117A. 1A Adjustable/Fixed Low Dropout Linear Regulator. Description. Features. Applications. Typical Applications.

FAN1117A. 1A Adjustable/Fixed Low Dropout Linear Regulator. Description. Features. Applications. Typical Applications. www.fairchildsemi.com A Adjustable/Fixed Low Dropout Linear Regulator Features Low dropout voltage Load regulation:.5% typical Trimmed current limit On-chip thermal limiting Standard SOT-223, TO-22, and