LTC1844 Series 150mA, Micropower, Low Noise, VLDO Linear Regulator FEATURES DESCRIPTIO TM Very Low Dropout: The LTC 1844 Series are low noise VLDO (very low 90mV at 150mA dropout) linear regulators designed for low power/portable 30mV at 50mA (LTC1844-3.3) applications. These regulators can operate from input Wide Input Voltage Range: 1.6V to 6.5V voltages as low as 1.6V. Typical output noise is only Low 35A Supply Current, Even in Dropout 30V and typical dropout for the LTC1844-3.3 is just RMS Low Noise: 60V (10Hz to 100kHz) 90mV at the maximum load current of 150mA, reducing to RMS 1.75% Voltage Accuracy Over Temperature, 30mV at 50mA. Voltage and Current Ranges The internal P-channel MOSFET pass transistor requires Fast Transient Response no base current, allowing the device to draw only 35A 10nA Supply Current in Shutdown during normal operation, independent of the dropout Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 2.8V, 3.3V voltage and load current. The quiescent current falls to a Adjustable Output Voltage: 1.25V to 6V negligible 10nA during shutdown. Output Current Limit Reverse-Battery and Reverse-Current Protection Other features include high output voltage accuracy, excellent transient response, stability with ultralow ESR No Protection Diodes Needed Stable with 1F Output Capacitor ceramic capacitors as small as 1F, reverse-battery and Stable with Ceramic Capacitors reverse-current protection, short-circuit and thermal overload protection and output current limiting. Short-Circuit and Thermal Overload Protection Low Profile (1mm) SOT-23 Package The LTC1844 regulators are available in a low profile U TM (1mm) SOT-23 (ThinSOT ) package. APPLICATIO S , LTC and LT are registered trademarks of Linear Technology Corporation. VLDO and ThinSOT are trademarks of Linear Technology Corporation. Portable Instruments and Battery-Powered Systems All other trademarks are the property of their respective owners. Bluetooth/802.11 Cards Cellular Phones PDAs and Notebook Computers TYPICAL APPLICATIO LTC1844-3.3 Dropout Voltage vs Load Current 120 Fixed Voltage Low Noise, VLDO Linear Regulator 100 V V IN OUT IN OUT 80 3.3V TO 6.5V 3.3V 1F 1F LTC1844-3.3 60 OFF ON SHDN BYP GND 40 0.1F 1844 TA01 20 0 0 25 50 75 100 125 150 I (mA) OUT 1844 TA02 1844fa 1 DROPOUT VOLTAGE (mV) U ULTC1844 Series ABSOLUTE AXI U RATI GS (Note 1) Supply Voltage (IN) ....................................... 7V to 7V Output Short-Circuit Duration ......................... Indefinite Input Voltage Operating Junction Temperature Range SHDN, BYP, ADJ .................................... 0.3V to 7V (Notes 2, 10) .....................................40C to 125C Output Voltage Storage Temperature Range ................. 65C to 150C OUT ........................................................ 0.3V to 7V Lead Temperature (Soldering, 10 sec).................. 300C OUT to IN .................................................. 7V to 7V UUW PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW TOP VIEW IN 1 5 OUT IN 1 5 OUT IN 1 5 OUT GND 2 GND 2 GND 2 SHDN 3 4 ADJ BYP 3 4 ADJ SHDN 3 4 BYP S5 PACKAGE S5 PACKAGE S5 PACKAGE 5-LEAD PLASTIC TSOT-23 5-LEAD PLASTIC TSOT-23 5-LEAD PLASTIC TSOT-23 T = 125C, = 250C/ W, = 90C/ W T = 125C, = 250C/ W, = 90C/ W T = 125C, = 250C/ W, = 90C/ W JMAX JA JC JMAX JA JC JMAX JA JC SEE THE APPLICATIONS INFORMATION SECTION SEE THE APPLICATIONS INFORMATION SECTION SEE THE APPLICATIONS INFORMATION SECTION S5 PART S5 PART S5 PART ORDER PART ORDER PART ORDER PART NUMBER MARKING NUMBER MARKING NUMBER MARKING LTF1 LTE8 LTE9 LTC1844ES5-1.5 LTC1844ES5-SD LTC1844ES5-BYP LTF2 LTC1844ES5-1.8 LTF3 LTC1844ES5-2.5 LTQK LTC1844ES5-2.8 LTF4 LTC1844ES5-3.3 Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: