LTC3025 300mA Micropower VLDO Linear Regulator FEATURES DESCRIPTION TM n Wide Input Voltage Range: 0.9V to 5.5V The LTC 3025 is a micropower, VLDO (very low drop- n Stable with Ceramic Capacitors out) linear regulator which operates from input voltages as n Very Low Dropout: 45mV at 300mA low as 0.9V. The device is capable of supplying 300mA of n Adjustable Output Range: 0.4V to 3.6V output current with a typical dropout voltage of only 45mV. n 2% Voltage Accuracy over Temperature A BIAS supply is required to run the internal reference and Supply Load LDO circuitry while output current comes directly from n Low Noise: 80V (10Hz to 100kHz) the IN supply for high ef ciency regulation. The low 0.4V RMS n BIAS Voltage Range: 2.5V to 5.5V internal reference voltage allows the LTC3025 output to n Fast Transient Recovery be programmed to much lower voltages than available in n Shutdown Disconnects Load from V and V common LDOs (range of 0.4V to 3.6V). The output voltage IN BIAS n Low Operating Current: I = 4A, I = 50A Typ is programmed via two ultrasmall SMD resistors. IN BIAS n Low Shutdown Current: I = 1A, I = 0.01A Typ IN BIAS The LTC3025s low quiescent current makes it an ideal n Output Current Limit choice for use in battery-powered systems. For 3-cell n Thermal Overload Protection NiMH and single cell Li-Ion applications, the BIAS voltage n Available in 6-Lead (2mm 2mm) DFN Package can be supplied directly from the battery while the input can come from a high ef ciency buck regulator, providing APPLICATIONS a high ef ciency, low noise output. n Low Power Handheld Devices Other features include high output voltage accuracy, n Low Voltage Logic Supplies excellent transient response, stability with ultralow ESR n DSP Power Supplies ceramic capacitors as small as 1F, short-circuit and n Cellular Phones thermal overload protection and output current limiting. n Portable Electronic Equipment The LTC3025 is available in a tiny, low pro le (0.75mm) n Handheld Medical Instruments 6-lead DFN (2mm 2mm) package. n Post Regulator for Switching Supply Noise Rejection L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 1.2V Output Voltage from 1.5V Input Supply 1MHz V Supply Rejection IN 50 V = 1.2V OUT BIAS OUT 45 I 300mA C = 10F OUT OUT 0.1F 1F Li-Ion 1.5V HIGH LTC3025 80.6k 40 OR EFFICIENCY 1.5V 3-CELL DC/DC IN ADJ 35 C = 1F OUT NiMH BUCK 0.1F 30 40.2k 25 OFF ON SHDN GND 3025 TA01 20 15 10 BIAS = 3.6V I = 100mA 5 OUT V = 1.2V I = 300mA OUT OUT 0 2.0 2.6 1.2 1.4 1.6 1.8 2.2 2.4 V (V) IN 3025fd 3025 TA01b 1 REJECTION (dB)LTC3025 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW V , V to GND ......................................... 0.3V to 6V BIAS IN SHDN to GND ............................................... 0.3V to 6V BIAS 1 6 SHDN ADJ to GND .................................................. 0.3V to 6V 2 7 GND 5 ADJ V ........................................0.3V to V + 0.3V or 6V OUT IN IN 3 4 OUT Operating Junction Temperature Range (Note 3) .................................................. 40C to 125C DC6 PACKAGE 6-LEAD (2mm s 2mm) PLASTIC DFN Storage Temperature Range ................... 65C to 125C T = 125C, = 102C/W, = 20C/W JMAX JA JC Output Short-Circuit Duration .......................... Inde nite EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3025EDC PBF LTC3025EDC TRPBF LBDY 6-Lead (2mm 2mm) Plastic DFN 40C to 125C LTC3025IDC PBF LTC3025IDC TRPBF LBDY 40C to 125C 6-Lead (2mm 2mm) Plastic DFN LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3025EDC LTC3025EDC TR LBDY 6-Lead (2mm 2mm) Plastic DFN 40C to 125C LTC3025IDC LTC3025IDC TR LBDY 6-Lead (2mm 2mm) Plastic DFN 40C to 125C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. For more information on lead free part marking, go to: