LT1529 LT1529-3.3/LT1529-5 3A Low Dropout Regulators with Micropower Quiescent Current and Shutdown FEATURES DESCRIPTIO Dropout Voltage: 0.6V at I = 3A OUT The LT 1529/LT1529-3.3/LT1529-5 are 3A low dropout Output Current: 3A regulators with micropower quiescent current and shut- Quiescent Current: 50A down. The devices are capable of supplying 3A of output No Protection Diodes Needed current with a dropout voltage of 0.6V. Designed for use Adjustable Output from 3.8V to 14V in battery-powered systems, the low quiescent current, 3.3V and 5V Fixed Output Voltages 50A operating and 16A in shutdown, make them an Controlled Quiescent Current in Dropout ideal choice. The quiescent current is well controlled it Shutdown I = 16A Q does not rise in dropout as it does with many other low Stable with 22F Output Capacitor dropout PNP regulators. Reverse Battery Protection Other features of the LT1529 /LT1529-3.3/LT1529-5 in- No Reverse Current clude the ability to operate with small output capacitors. Thermal Limiting They are stable with 22F on the output while most older devices require up to 100F for stability. Small ceramic U APPLICATIO S capacitors can be used, enhancing manufacturabiltiy. Also the input may be connected to voltages lower than the High Efficiency Regulator output voltage, including negative voltages, without re- Regulator for Battery-Powered Systems verse current flow from output to input. This makes the Post Regulator for Switching Supplies LT1529/LT1529-3.3/LT1529-5 ideal for backup power 5V to 3.3V Logic Regulator situations where the output is held high and the input is at , LTC and LT are registered trademarks of Linear Technology Corporation. ground or reversed. Under these conditions, only 16A All other trademarks are the property of their respective owners. will flow from the OUTPUT pin to ground. The devices are available in 5-lead TO-220 and 5-lead DD packages. TYPICAL APPLICATIO Dropout Voltage 0.6 5V Supply with Shutdown 0.5 5 1 5V V OUTPUT IN 3A + 0.4 V > 5.5V LT1529-5 IN 22F 4 2 SHDN SENSE 0.3 GND 3 0.2 V (PIN 4) OUTPUT SHDN 0.1 <0.25 OFF >2.8 ON 0 NC ON LT1529 TA01 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT CURRENT (A) LT1529 TA02 152935fb 1 DROPOUT VOLTAGE (V) U ULT1529 LT1529-3.3/LT1529-5 ABSOLUTEXAI U RATI GS (Note 1) Input Voltage ...................................................... 15V* Output Short-Circuit Duration ......................... Indefinite OUTPUT Pin Reverse Current .............................. 10mA Storage Temperature Range ................ 65C to 150C SENSE Pin Current .............................................. 10mA Operating Junction Temperature Range ADJ Pin Current ................................................... 10mA Commercial .......................................... 0C to 125C SHDN Pin Input Voltage (Note 2) .............. 6.5V, 0.6V Industrial ......................................... 45C to 125C SHDN Pin Input Current (Note 2) .......................... 5mA Lead Temperature (Soldering, 10 sec).................. 300C *For applications requiring input voltage ratings greater than 15V, contact the factory. PACKAGE/ORDER I FOR ATIO FRONT VIEW FRONT VIEW ORDER PART ORDER PART NUMBER 5 V NUMBER IN 5 V IN 4 SHDN 4 SHDN TAB IS TAB IS 3 GND 3 GND LT1529CQ LT1529CT GND GND 2 SENSE/ADJ* 2 SENSE/ADJ* LT1529CQ-3.3 LT1529CT-3.3 1 OUTPUT 1 OUTPUT LT1529CQ-5 LT1529CT-5 Q PACKAGE T PACKAGE LT1529IQ LT1529IT 5-LEAD PLASTIC DD PAK 5-LEAD PLASTIC TO-220 LT1529IQ-3.3 LT1529IT-3.3 *PIN 2 = SENSE FOR LT1529-3.3/LT1529-5 *PIN 2 = SENSE FOR LT1529-3.3/LT1529-5 = ADJ FOR LT1529 = ADJ FOR LT1529 LT1529IQ-5 LT1529IT-5 T = 125C, 30C/W T = 125C, 50C/W JMAX JA JMAX JA Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the operating temperature range, otherwise specificatons are at T = 25C. (Note 3) A PARAMETER CONDITIONS MIN TYP MAX UNITS Regulated Output Voltage LT1529-3.3 V = 3.8V, I = 1mA, T = 25C 3.250 3.300 3.350 V IN OUT J (Note 4) 4.3V < V < 15V, 1mA < I < 3A 3.200 3.300 3.400 V IN OUT LT1529-5 V = 5.5V, I = 1mA, T = 25C 4.925 5.000 5.075 V IN OUT J 6V < V < 15V, 1mA < I < 3A 4.850 5.000 5.150 V IN OUT LT1529 (Note 5) V = 4.3V, I = 1mA, T = 25C 3.695 3.750 3.805 V IN OUT J 4.8V < V < 15V, 1mA < I < 3A 3.640 3.750 3.860 V IN OUT Line Regulation LT1529-3.3 V = 3.8V to 15V, I = 1mA 1.5 10 mV IN OUT LT1529-5 V = 5.5V to 15V, I = 1mA 1.5 10 mV IN OUT LT1529 (Note 5) V = 4.3V to 15V, I = 1mA 1.5 10 mV IN OUT Load Regulation LT1529-3.3 I = 1mA to 3A, V = 4.3V, T = 25C520mV LOAD IN J = 1mA to 3A, V = 4.3V 12 30 mV I LOAD IN LT1529-5 I = 1mA to 3A, V = 6V, T = 25C520mV LOAD IN J I = 1mA to 3A, V = 6V 12 30 mV LOAD IN LT1529 (Note 5) I = 1mA to 3A, V = 4.8V, T = 25C520mV LOAD IN J I = 1mA to 3A, V = 4.8V 12 30 mV LOAD IN Dropout Voltage I = 10mA, T = 25C 110 180 mV LOAD J (Note 6) I = 10mA 250 mV LOAD I = 100mA, T = 25C 200 300 mV LOAD J I = 100mA 400 mV LOAD 152935fb 2 U WU U W W W