LTC3388-1/LTC3388-3 20V High Efficiency Nanopower Step-Down Regulator FEATURES DESCRIPTION n 720nA Input I in Regulation (No Load), V = 4V The LTC 3388-1/LTC3388-3 are high efficiency step-down Q IN n 820nA Input I in Regulation (No Load), V = 20V DC/DC converters with internal high side and synchronous Q IN n 400nA Input I in UVLO power switches that draw only 720nA typical DC supplycur- Q n 2.7V to 20V Input Operating Range rent at no load while maintaining output voltage regulation. n Up to 50mA of Output Current Capable of supplying 50mA of load current, the LTC3388-1/ n Pin Selectable Output Voltages: LTC3388-3 also incorporate an accurate undervoltage n 1.2V, 1.5V, 1.8V, 2.5V (LTC3388-1) lockout (UVLO) feature to disable the converter and main- n 2.8V, 3.0V, 3.3V, 5.0V (LTC3388-3) tain a low quiescent current state when the input voltage n High Efficiency Hysteretic Synchronous falls below 2.3V. In regulation, the LTC3388-1/LTC3388-3 DC/DC Conversion enter a sleep state in which both input and output quies- n Standby Mode Disables Buck Switching cent currents are minimal. The buck converter turns on n Available in 10-Lead MSE and 3mm 3mm and off as needed to maintain regulation. An additional DFN Packages standby mode disables buck switching while the output is in regulation for short duration loads requiring low ripple. APPLICATIONS Output voltages of 1.2V, 1.5V, 1.8V, 2.5V (LTC3388-1) n and 2.8V, 3.0V, 3.3V, 5.0V (LTC3388-3) are pin selectable. Keep Alive Power for Portable Products n The LTC3388-1/LTC3388-3 can operate with V up to 20V Industrial Control Supplies IN n while the no load quiescent current remains below 1A. Distributed Power Systems n L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks Battery-Operated Devices of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Efficiency vs Load Current 50mA Step-Down Converter 100 V = 1.8V, L = 100H OUT 2.7V TO 20V V 90 IN 1F LTC3388-1/ 80 100H 6V LTC3388-3 SW CAP V OUT 70 2.2F 47F V V IN2 OUT 25V 60 6V PGOOD EN 4.7F 50 2 OUTPUT 6V D0, D1 STBY VOLTAGE 40 GND SELECT 30 338813 TA01a 20 V = 3.0V IN V = 10V IN 10 V = 20V IN 0 1 10 100 1m 10m LOAD CURRENT (A) 338813 TA01b 338813fa 1 For more information www.linear.com/LTC3388 EFFICIENCY (%)LTC3388-1/LTC3388-3 ABSOLUTE MAXIMUM RATINGS (Note 1) V ............................................................. 0.3V to 22V I .......................................................................210mA IN SW D0, D1 ..............0.3V to Lesser of (V + 0.3V) or 6V Operating Junction Temperature Range IN2 CAP ...................... Higher of 0.3V or (V 6V) to V (Notes 2, 3) ............................................ 40C to 125C IN IN V , V ..........0.3V to Lesser of (V + 0.3V) or 6V Storage Temperature Range .................. 65C to 125C IN2 OUT IN EN, STBY ..................................................... 0.3V to 6V Lead Temperature (Soldering, 10 sec) PGOOD ......................................................... 0.3V to 6V MSE Only ..............................................................300C PIN CONFIGURATION TOP VIEW TOP VIEW 10 EN 1 PGOOD EN 1 10 PGOOD STBY 2 9 D0 STBY 2 9 D0 11 11 CAP 3 8 D1 CAP 3 8 D1 GND GND V 4 7 V IN IN2 V 4 7 V IN IN2 SW 5 6 V OUT SW 5 6 V OUT MSE PACKAGE 10-LEAD PLASTIC MSOP DD PACKAGE T = 125C, = 45C/W, = 10C/W 10-LEAD (3mm 3mm) PLASTIC DFN JMAX JA JC EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB T = 125C, = 43C/W, = 7.5C/W JMAX JA JC EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3388EDD-1 PBF LTC3388EDD-1 TRPBF LFWN 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC3388IDD-1 PBF LTC3388IDD-1 TRPBF LFWN 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC3388EMSE-1 PBF LTC3388EMSE-1 TRPBF LTFWM 10-Lead Plastic MSOP 40C to 125C LTC3388IMSE-1 PBF LTC3388IMSE-1 TRPBF LTFWM 10-Lead Plastic MSOP 40C to 125C LTC3388EDD-3 PBF LTC3388EDD-3 TRPBF LFWQ 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC3388IDD-3 PBF LTC3388IDD-3 TRPBF LFWQ 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LTC3388EMSE-3 PBF LTC3388EMSE-3 TRPBF LTFWP 10-Lead Plastic MSOP 40C to 125C LTC3388IMSE-3 PBF LTC3388IMSE-3 TRPBF LTFWP 10-Lead Plastic MSOP 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: