LTC3335 Nanopower Buck-Boost DC/DC with Integrated Coulomb Counter Fea T Descrip T n 680nA Input Quiescent Current (Output in The LTC 3335 is a high efficiency, low quiescent current Regulation at No Load) (680nA) buck-boost DC/DC converter with an integrated n 1.8V to 5.5V Input Operating Range precision coulomb counter which monitors accumulated n Selectable Output Voltages of 1.8V, 2.5V, 2.8V, battery discharge in long life battery powered applications. 3V, 3.3V, 3.6V, 4.5V, 5V The buck-boost can operate down to 1.8V on its input and n Integrated Coulomb Counter Measures provides eight pin-selectable output voltages with up to Accumulated Battery Discharge 50mA of output current. n 5% Battery Discharge Measurement Accuracy The coulomb counter stores the accumulated battery dis- n Programmable Peak Input Current of 5mA, 10mA, 2 charge in an internal register accessible via an I C interface. 15mA, 25mA, 50mA, 100mA, 150mA, 250mA The LTC3335 features a programmable discharge alarm n Up to 50mA of Output Current threshold. When the threshold is reached, an interrupt is n Up to 90% Efficiency generated at the IRQ pin. n Programmable Coulomb Counter Prescaler for Wide To accommodate a wide range of battery types and sizes, Range of Battery Sizes n the peak input current can be selected from as low as 5mA Programmable Discharge Alarm Threshold 2 n to as high as 250mA and the full-scale coulomb counter I C Interface n has a programmable range of 32,768:1. Low Profile (0.75mm) 20-Lead (3mm 4mm) QFN Package The LTC3335 is available in a 3mm 4mm QFN-20 package. L, LT, LTC, LTM, Linear Technology, the Linear logo, SmartMesh and Dust Networks are a T registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Long Lifetime Primary Cell Battery Applications n Wireless Sensors n Remote Monitors n Dust Networks SmartMesh Applications Typical a T Efficiency vs Load for 100mA I Setting PEAK 2.2mH TO 47H 100 I = 5mA TO 250mA PEAK SW1 SW2 90 BAT V 1.8V TO 5V OUT 80 + PRIMARY CELL 10F PBAT PV 47F OUT 70 EN 60 DV CC 50 10k 10k LTC3335 SCL 40 2 I C SDA IRQ 30 3 V = 1.8V OUT IPK 2:0 PGOOD 20 BAT = 3.6V V = 2.5V OUT 3 L = 150H V = 3.3V OUT OUT 2:0 10 DCR = 0.3 V = 5V OUT GND 0 3335 TA01 0.001 0.01 0.1 1 10 100 I (mA) LOAD 3335 TA01a 3335f 1 For more information www.linear.com/LTC3335 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3335 a Te Maxi Mu M r a T p c F T (Note 1) TOP VIEW BAT, PBAT, V , PV Voltage .................. 0.3V to 6V OUT OUT EN, OUT 2:0 , IPK 2:0 Voltage .....0.3V to Lesser of (BAT + 0.3V) or 6V 20 19 18 17 DV , SDA, SCL Voltage .............................. 0.3V to 6V CC SDA 1 16 EN PGOOD, DV 2 15 IPK2 CC IPK1 IRQ Voltage .....0.3V to Lesser of (DV + 0.3V) or 6V OUT2 3 14 CC 21 PGND OUT1 4 13 IPK0 SW1, SW2 Current .............................................. 350mA OUT0 5 12 V OUT Operating Junction Temperature Range GNDD 6 11 PV OUT (Notes 2, 3) ............................................ 40C to 125C 7 8 9 10 Storage Temperature Range .................. 65C to 150C UDC PACKAGE 20-LEAD (3mm 4mm) PLASTIC QFN T = 125C, = 52C/W JMAX JA EXPOSED PAD (PIN 21) IS PGND, MUST BE SOLDERED TO PCB o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3335EUDC PBF LTC3335EUDC TRPBF LGTR 20-Lead (3mm 4mm) Plastic QFN 40C to 125C LTC3335IUDC PBF LTC3335IUDC TRPBF LGTR 20-Lead (3mm 4mm) Plastic QFN 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: