LT1963A Series 1.5A, Low Noise, Fast Transient Response LDO Regulators FEATURES DESCRIPTION n Optimized for Fast Transient Response The LT 1963A series are low dropout regulators optimized n Output Current: 1.5A for fast transient response. The devices are capable of n Dropout Voltage: 340mV supplying 1.5A of output current with a dropout voltage of n Low Noise: 40V (10Hz to 100kHz) 340mV. Operating quiescent current is 1mA, dropping to RMS n 1mA Quiescent Current <1A in shutdown. Quiescent current is well controlled it n No Protection Diodes Needed does not rise in dropout as it does with many other regula- n Controlled Quiescent Current in Dropout tors. In addition to fast transient response, the LT1963A n Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V regulators have very low output noise which makes them n Adjustable Output from 1.21V to 20V ideal for sensitive RF supply applications. n <1A Quiescent Current in Shutdown Output voltage range is from 1.21V to 20V. The LT1963A n Stable with 10F Output Capacitor* regulators are stable with output capacitors as low as n Stable with Ceramic Capacitors* 10F. Internal protection circuitry includes reverse bat- n Reverse Battery Protection tery protection, current limiting, thermal limiting and n No Reverse Current reverse current protection. The devices are available in n Thermal Limiting fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as n 5-Lead TO-220, DD, 3-Lead SOT-223 and an adjustable device with a 1.21V reference voltage. The 8-Lead SO Packages LT1963A regulators are available in 5-lead TO-220, DD, n AEC-Q100 Qualified for Automotive Applications 3-lead SOT-223, 8-lead SO and 16-lead TSSOP packages. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 6118263, 6144250. APPLICATIONS *See Applications Information Section. n 3.3V to 2.5V Logic Power Supplies n Post Regulator for Switching Supplies TYPICAL APPLICATION Dropout Voltage 400 3.3V to 2.5V Regulator 350 2.5V IN OUT 300 1.5A + + V > 3V 10F* 10F* IN LT1963A-2.5 250 SHDN SENSE 200 *TANTALUM, GND 150 CERAMIC OR ALUMINUM ELECTROLYTIC 1963A TA01 100 50 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 OUTPUT CURRENT (A) 1963A TA02 Rev. G 1 Document Feedback For more information www.analog.com DROPOUT VOLTAGE (mV)LT1963A Series ABSOLUTE MAXIMUM RATINGS (Note 1) Operating Junction Temperature Range (Note 3) IN Pin Voltage ........................................................ 20V LT1963AE ...........................................40C to 125C OUT Pin Voltage ......................................................20V LT1963AI............................................40C to 125C Input to Output Differential Voltage (Note 2) ...........20V LT1963AMP .......................................55C to 125C SENSE Pin Voltage ............................................... 20V Storage Temperature Range ...................65C to 150C ADJ Pin Voltage ...................................................... 7V Lead Temperature (Soldering, 10 sec) .................. 300C SHDN Pin Voltage ................................................. 20V Output Short-Circuit Duration ........................ Indefinite PIN CONFIGURATION TOP VIEW 1 GND 16 GND NC 2 15 NC FRONT VIEW FRONT VIEW SENSE/ OUT 3 14 IN 5 SENSE/ADJ* 5 ADJ* OUT 4 13 IN 4 OUT 4 OUT 17 TAB IS OUT 5 12 IN 3 GND 3 GND GND SENSE/ADJ* 6 11 NC 2 IN 2 IN 1 1 SHDN SHDN GND 7 10 SHDN GND 8 9 GND Q PACKAGE TAB IS T PACKAGE 5-LEAD PLASTIC DD GND 5-LEAD PLASTIC TO-220 FE PACKAGE *PIN 5 = SENSE FOR LT1963A-1.5/LT1963A-1.8/ *PIN 5 = SENSE FOR LT1963A-1.5/LT1963A-1.8/ 16-LEAD PLASTIC TSSOP LT1963A-2.5/LT1963A-3.3 LT1963A-2.5/LT1963A-3.3 EXPOSED PAD (PIN 17) IS GND. MUST BE = ADJ FOR LT1963A = ADJ FOR LT1963A SOLDERED TO THE PCB. T = 125C, = 30C/W T = 125C, = 50C/W JMAX JA JMAX JA *PIN 6 = SENSE FOR LT1963A-1.5/LT1963A-1.8/ LT1963A-2.5/LT1963A-3.3 = ADJ FOR LT1963A T = 125C, = 38C/W JMAX JA TOP VIEW FRONT VIEW OUT 1 8 IN 3 OUT SENSE/ADJ* 2 7 GND TAB IS 2 GND GND 3 6 GND GND NC 4 5 SHDN 1 IN S8 PACKAGE ST PACKAGE 8-LEAD PLASTIC SO 3-LEAD PLASTIC SOT-223 *PIN 2 = SENSE FOR LT1963A-1.5/LT1963A-1.8/ T = 125C, = 50C/W LT1963A-2.5/LT1963A-3.3 JMAX JA = ADJ FOR LT1963A T = 125C, = 70C/W JMAX JA Rev. G 2 For more information www.analog.com