LT1764 Series 3A, Fast Transient Response, Low Noise, LDO Regulators FEATURES DESCRIPTIO Optimized for Fast Transient Response The LT 1764 is a low dropout regulator optimized for fast Output Current: 3A transient response. The device is capable of supplying 3A Dropout Voltage: 340mV at 3A of output current with a dropout voltage of 340mV. Oper- Low Noise: 40V (10Hz to 100kHz) RMS ating quiescent current is 1mA, dropping to <1A in 1mA Quiescent Current shutdown. Quiescent current is well controlled it does not Wide Input Voltage Range: 2.7V to 20V rise in dropout as it does with many other regulators. In No Protection Diodes Needed addition to fast transient response, the LT1764 has very Controlled Quiescent Current in Dropout low output voltage noise which makes the device ideal for Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V sensitive RF supply applications. Adjustable Output from 1.21V to 20V Output voltage range is from 1.21V to 20V. The LT1764 <1A Quiescent Current in Shutdown regulators are stable with output capacitors as low as 10F. Stable with 10F Output Capacitor Internal protection circuitry includes reverse battery pro- Reverse Battery Protection tection, current limiting, thermal limiting and reverse cur- No Reverse Current rent protection. The device is available in fixed output Thermal Limiting voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an adjustable Available in 5-Lead TO-220, DD and 16-Lead device with a 1.21V reference voltage. The LT1764 regu- TSSOP Packages lators are available in 5-lead TO-220, DD and Exposed Pad U 16-lead TSSOP packages. APPLICATIO S , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, 3.3V to 2.5V Logic Power Supply including 6144250, 6118263. Post Regulator for Switching Supplies TYPICAL APPLICATIO Dropout Voltage 400 3.3V to 2.5V Regulator 350 IN OUT 300 2.5V 250 IN OUT 3A + + V > 3V 10F 10F IN 200 LT1764-2.5 150 SHDN SENSE 100 GND 1764 TA01 50 0 0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (A) 1764 TA02 1764fb 1 DROPOUT VOLTAGE (mV) U ULT1764 Series ABSOLUTE MAXIMUM RATINGS (Note 1) IN Pin Voltage ........................................................ 20V SHDN Pin Voltage ................................................. 20V OUT Pin Voltage .................................................... 20V Output Short-Circuit Duration ......................... Indefinite Input to Output Differential Voltage (Note 12) ....... 20V Operating Junction Temperature Range 40C to 125C SENSE Pin Voltage ............................................... 20V Storage Temperature Range ................. 65C to 150C ADJ Pin Voltage ...................................................... 7V Lead Temperature (Soldering, 10 sec).................. 300C PACKAGE/ORDER INFORMATION TOP VIEW GND 1 16 GND FRONT VIEW FRONT VIEW NC 2 15 NC SENSE/ 5 SENSE/ADJ* 5 ADJ* OUT 3 14 IN 4 4 OUT OUT OUT 4 13 IN TAB IS 17 3 GND 3 GND GND OUT 5 12 IN 2 2 IN IN SENSE/ADJ* 6 11 NC 1 SHDN 1 SHDN GND 7 10 SHDN Q PACKAGE TAB IS T PACKAGE GND 8 9 GND GND 5-LEAD PLASTIC TO-220 5-LEAD PLASTIC DD FE PACKAGE *PIN 5 = SENSE FOR LT1764-1.5/LT1764-1.8/ *PIN 5 = SENSE FOR LT1764-1.5/LT1764-1.8/ 16-LEAD PLASTIC TSSOP LT1764-2.5/LT1764-3.3 LT1764-2.5/LT1764-3.3 EXPOSED PAD (PIN 17) IS GND. MUST BE = ADJ FOR LT1764 SOLDERED TO THE PCB. = ADJ FOR LT1764 *PIN 6 = SENSE FOR LT1764-1.5/ T = 150C, = 50C/ W T = 150C, = 30C/ W JMAX JA JMAX JA LT1764-1.8/LT1764-2.5/ LT1764-3.3 = ADJ FOR LT1764 T = 150C, = 38C/ W JMAX JA ORDER PART NUMBER ORDER PART NUMBER ORDER PART FE PART MARKING NUMBER 1764EFE LT1764EQ LT1764ET LT1764EFE 1764EFE15 LT1764EQ-1.5 LT1764ET-1.5 LT1764EFE-1.5 1764EFE18 LT1764EQ-1.8 LT1764ET-1.8 LT1764EFE-1.8 1764EFE25 LT1764EQ-2.5 LT1764ET-2.5 LT1764EFE-2.5 1764EFE33 LT1764EQ-3.3 LT1764ET-3.3 LT1764EFE-3.3 Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: