LTC3534 7V, 500mA Synchronous Buck-Boost DC/DC Converter FeaT DescripT n Regulated Output with Input Voltages Above, The LTC 3534 is a wide V range, highly efficient, fixed IN Below or Equal to the Output frequency, buck-boost DC/DC converter that operates n 2.4V to 7V V and 1.8V to 7V V Ranges from input voltages above, below or equal to the output IN OUT n 5V V at 500mA from 4 AA Cells voltage. The topology incorporated in the IC provides a OUT n Single Inductor continuous transfer function through all operating modes, n Synchronous Rectification: Up to 94% Efficiency making the product ideal for multi-cell Alkaline/NiMH or n Burst Mode Operation with 25A I single Lithium-Ion/Polymer applications where the output Q n Output Disconnect in Shutdown voltage is within the battery voltage range. n 1MHz Switching Frequency The LTC3534 offers extended V and V ranges of 2.4V IN OUT n <1A Shutdown Current to 7V and 1.8V to 7V, respectively. Quiescent current is n Small Thermally Enhanced 16-Lead (5mm 3mm only 25A in Burst Mode operation, maximizing battery 0.75mm) DFN and 16-Lead GN Packages life in portable applications. Burst Mode operation is user controlled and can be enabled by driving the PWM pin Ta low. If the PWM pin is driven high then fixed frequency switching is enabled. n Medical Instruments n Portable Barcode Readers Other features include fixed 1MHz operating frequency, a n Portable Inventory Terminals <1A shutdown, short-circuit protection, programmable n USB to 5V Supply soft-start, current limit and thermal overload protection. n Handheld GPS The LTC3534 is available in the thermally enhanced 16-lead (3mm 5mm) DFN and 16-lead GN packages. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Ta 4 AA Cells to 5V at 500mA Buck-Boost Converter 4 AA Cells to 5V Efficiency vs V IN 100 5H 95 SW1 SW2 V PWM I = 300mA OUT OUT V IN PV V 5V IN OUT 3.6V TO 6.4V 90 + 500mA 4 AA V 22F IN 10k 649k CELLS 10F PWM I = 500mA OUT LTC3534 33pF 85 FB OFF ON RUN/SS 15k BURST PWM PWM V C 80 PGND1 GND PGND2 162k 330pF 3534 TA01a 75 3.6 4.0 4.4 4.8 5.2 5.6 6.0 6.4 V (V) IN 3534 TA01b 3534fb 1 For more information www.linear.com/LTC3534 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3534 Ta e MaxiMMu Tar (Note 1) V , PV Voltages........................................ 0.3V to 8V V , FB Voltages ............................................ 0.3V to 6V IN IN C V Voltage ................................................ 0.3V to 8V Operating Temperature Range (Note 2)....40C to 85C OUT SW1, SW2 Voltages Maximum Junction Temperature (Note 3)............. 125C DC ............................................................ 0.3V to 8V Storage Temperature Range .................. 65C to 150C Pulsed < 100ns ........................................ 0.3V to 9V Lead Temperature RUN/SS, PWM Voltages .............................. 0.3V to 8V (Soldering, 10sec GN Package) ............................300C p Fc T TOP VIEW TOP VIEW GND 1 16 GND GND 1 16 GND RUN/SS 2 15 FB RUN/SS 2 15 FB GND 3 14 V GND 3 14 V C C PGND1 4 13 V PGND1 4 13 V IN IN 17 SW1 5 12 PV SW1 5 12 PV IN IN SW2 6 11 V SW2 6 11 V OUT OUT PGND2 7 10 PWM PGND2 7 10 PWM GND 8 9 GND GND 8 9 GND GN PACKAGE DHC PACKAGE 16-LEAD PLASTIC SSOP NARROW - FUSED 16-LEAD (5mm 3mm) PLASTIC DFN T = 125C, = 90C/W (4-LAYER BOARD), = 37C/W T = 125C, = 43C/W (4-LAYER BOARD), = 4C/W JMAX JA JC JMAX JA JC PINS 1, 8, 9, AND 16 ARE PGND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB Dro Fni MTa LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3534EDHC PBF LTC3534EDHC TRPBF 3534 16-Lead (5mm 3mm) Plastic DFN 40C to 85C LTC3534EGN PBF LTC3534EGN TRPBF 3534 16-Lead SSOP Narrow - Fused 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3534EDHC LTC3534EDHC TR 3534 40C to 85C 16-Lead (5mm 3mm) Plastic DFN LTC3534EGN LTC3534EDE TR 3534 16-Lead SSOP Narrow - Fused 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: