AIC1740 Low Output Voltage, 500mA Low Dropout Linear Regulator n FEATURES l l l l l l l l n DESCRIPTION Low Dropout Voltage of 900mV at 500mA Output Current (3.0V Output Version). Guaranteed 500mA Output Current. Internal 1.5Ω P-MOSFET Draws no Base Current. Low Ground Current at 65µA. 2% Accuracy Output Voltage of 1.8V/ 2.0V/ 2.5V/ 2.7V/ 3.0V. Input Voltage Range up to 12V. Needs only 4.7µF for Stability. Current and Thermal Limiting. l l l l l regulator. The superior characteristics of the AIC1740 include zero base current loss, very low dropout voltage, and 2% accuracy output voltage. Typical ground current remains approximately 65µA, from no load to maximum loading conditions. Dropout voltage is exceptionally low. Output current limiting and thermal limiting are built in to provide maximal protection to the n APPLICATIONS l The AIC1740 is a 3-pin low dropout linear AIC1740 against fault conditions. Voltage Regulator for CD-ROM Drivers. Voltage Regulator for LAN Cards. Voltage Regulator for Monitor Microprocessor. Voltage Regulator for RAM Module. Wireless Communication Systems. Battery Powered Systems. The AIC1740 comes in the popular SOT-223, TO-251 and TO-252 packages. n TYPICAL APPLICATION CIRCUIT VIN VI N + VOUT AIC1740 1µF CI N GND VOUT + 10µ F C OUT Low Dropout Linear Regulator Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC DS-1740-00 Aug 2, 00 TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 2 AIC1740 n ORDERING INFORMATION ORDER NUMBER AIC1740-XCX PACKAGING TYPE E: TO-252 F: TO-251 Y: SOT-223 OUTPUT VOLTAGE 18: 1.8V 20: 2.0V 25: 2.5V 27: 2.7V 30: 3.0V AIC1740-18CE AIC1740-20CE AIC1740-25CE AIC1740-27CE AIC1740-30CE (TO-252) PIN CONFIGURATION FRONT VIEW 1: VOUT 2: GND 3: VIN 1 2 3 AIC1740-18CF AIC1740-20CF AIC1740-25CF AIC1740-27CF AIC1740-30CF (TO-251) FRONT VIEW 1: VOUT 2: GND 3: VIN 1 2 3 AIC1740-18CY AIC1740-20CY AIC1740-25CY AIC1740-27CY AIC1740-30CY (SOT-223) FRONT VIEW 1: VOUT 2: GND 3: VIN 1 2 3 n ABSOLUTE MAXIMUM RATINGS Input Supply Voltage ...................................… … … … .................................... -0.3~12V Operating Junction Temperature Range Storage Temperature Range .......… … … .............................. -40°C~ 85°C .........................… … … … .......................... -65°C~150°C Power Dissipation ....… … … … … … … … … … … … … ..… … … … … ..… … ............... 0.85W Thermal Resistance θJC TO-251, TO-252 Package ....… … .… … .......... 12.5°C/W SOT-223 Package ....… … … … ..… … … .............15°C/W n TEST CIRCUIT Refer to the TYPICAL APPLICATION CIRCUIT 2 AIC1740 n ELECTRICAL CHARACTERISTICS (Ta=25°C, CIN=1µF, COUT=10µF, unless otherwise specified.) PARAMETER Output Voltage Output Voltage Temperature Coefficiency Line Regulation TEST CONDITIONS No Load AIC1740-30 AIC1740-27 AIC1740-25 AIC1740-20 AIC1740-18 (Note 1) VIN=4.0~12V VIN=4.0~12V VIN=4.0~12V VIN=4.0~12V VIN=4.0~12V MIN. TYP. MAX. 2.940 2.646 2.450 1.960 1.764 3.0 2.7 2.5 2.0 1.8 50 3.060 2.754 2.550 2.040 1.836 UNIT V PPM/°C IL=1mA, VIN=4.0~12V 3 10 Load Regulation (Note 2) Current Limit (Note 3) VIN=5V, IL=0.1~500mA 20 50 Dropout Voltage (Note 4) AIC1740s AIC1740-30 AIC1740-27 AIC1740-25 AIC1740-20 AIC1740-18 VIN=5V, VOUT=0V 650 IL=0.1mA IL=500mA 0.2 900 950 1000 1260 1370 mV mV mA 10 1050 1100 1150 1410 1520 mV mV Ground Current IO=0.1mA~IMAX, VIN=4V~12V 65 90 µA Note 1: Guaranteed by design. Note 2: Regulation is measured at constant junction temperature, using pulse testing with a low ON time. Note 3: Current limit is measured by pulsing a short time. Note 4: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below the value measured with a 1V differential. 3 AIC1740 n TYPICAL PERFORMANCE CHARACTERISTICS Load Transient Response Dropout Voltage vs Load Current COUT=1µF 1400 VOUT =1.8V 1300 Dropout Voltage (mV) 1200 V OUT =3.0V VOUT VOUT =2.0V 1100 200mV/DIV 1000 900 800 700 VOUT=2.5V 600 I OUT=250mA V OUT=2.7V 500 400 I OUT VOUT =3.0V 300 IOUT=0.1mA 200 100 0 0 50 100 150 200 250 300 350 400 450 500 Load Current (mA) Time (0.5mS/DIV) Load Transient Response Line Transient Response COUT =1µF COUT =10µF IL=1mA VIN =6V VOUT=3.0V VOUT VIN VIN=4.0V 50mV/DIV I OUT =250mA I OUT IOUT=0.1mA VOUT VOUT =3.0V 20mV/DIV Time (1mS/DIV) Time (0.25mS/DIV) Recommended Max. Output Current vs Input Voltage 600 550 Output Current (mA) 500 450 3.0V 400 2.7V 1.8V 350 300 2.5V 2.0V 250 200 150 100 50 0 3 4 5 6 7 8 9 10 11 12 Input voltage (V) 4 AIC1740 n BLOCK DIAGRAM VIN VOUT CURRENT LIMITING ERROR AMP + - + THERMAL SHUTDOWN 1.235V Reference GND n PIN DESCRIPTION VOUT PIN - Output pin. GND PIN - Power GND. VIN PIN - Power Supply Input. n APPLICATION INFORMATIONS A 4.7µF (or greater) capacitor is required between recommended for operation below -25°C. The the AIC1740 output and ground for stability. value of this capacitor may be increased without Without this capacitor the part will oscillate. Even limit. though most types of capacitor may work, the equivalent series resistance (ESR) should be held A 0.1µF capacitor (or greater) should be placed to 5Ω or less if Aluminum electrolytic type is used. from the AIC1740 input to ground if the lead Many Aluminum electrolytics have electrolytes that inductance between the input and power source freeze at about -30°C, so solid tantalums are exceeds 500nH (approximately 10 inches of trace). 5 AIC1740 n PHYSICAL DIMENSIONS l TO-251 (unit: mm) E A b2 C1 SYMBOL MIN MAX A 2.19 2.38 A1 1.02 1.27 b 0.55 0.89 b2 5.21 5.46 C 0.46 0.58 C1 0.46 0.58 D 5.33 5.59 E 6.35 6.73 D L C b e 2.28 (TYP.) L 7.62 (TYP.) A1 e l TO-252 (unit: mm) E C1 b2 A D H L b e A1 SYMBOL MIN MAX A 2.19 2.38 A1 1.02 1.27 b 0.64 0.88 b2 5.21 5.46 C1 0.46 0.58 D 5.33 5.59 E 6.35 6.73 e 2.28 (TYP.) H 9.40 10.42 L 0.51 - 6 AIC1740 l SOT-223 (unit: mm) 1.80 MAX D B1 13 ° ± 3 E ° H e A1 B 13 ° ± 3 ° 3 (PLCS) SYMBOL MIN MAX A1 0.02 0.12 B 0.60 0.80 B1 2.90 3.15 C 0.24 0.35 D 6.30 6.80 E 3.30 3.70 e C H 2.30 (TYP.) 6.70 7.30 0° ~ 10 ° 0.91 MIN 13 ° ± 3 ° l SOT-223 MARKING Part No. Marking AIC1740-18 AZ18 AIC1740-20 AZ20 AIC1740-25 AZ25 AIC1740-27 AZ27 AIC1740-30 AZ30 7