P (mW) LOSS LTC3245 Wide V Range, IN Low Noise, 250mA Buck-Boost Charge Pump Fea T Descrip T n 2.7V to 38V V Range The LTC 3245 is a switched capacitor buck-boost DC/DC IN n I = 18A Operating 4A in Shutdown converter that produces a regulated output (3.3V, 5V or Q n 12V to 5V Efficiency = 81% adjustable) from a 2.7V to 38V input. The device uses n Multimode Operation (2:1, 1:1, 1:2) with Automatic switched capacitor fractional conversion to maintain Mode Switching regulation over a wide range of input voltage. Internal n Low Noise, Constant Frequency Operation circuitry automatically selects the conversion ratio to n Pin Selectable Burst Mode Operation optimize efficiency as input voltage and load conditions n V : Fixed 3.3V, 5V or Adjustable (2.5V to 5V) vary. No inductors are required. OUT n I Up to 250mA OUT The unique constant frequency architecture provides a n Overtemperature and Short-Circuit Protection lower noise output than conventional charge pump regu- n Operating Junction Temperature: 150C Maximum lators. To optimize efficiency at the expense of slightly n Thermally Enhanced 12-Pin MSOP and Low Profile higher output ripple, the device has pin selectable Burst 12-Pin (3mm 4mm) DFN Packages Mode operation. Low operating current (20A with no load, 4A in shut- a T down) and low external parts count (three small ceramic n Automotive ECU/CAN Transceiver Supplies capacitors) make the LTC3245 ideally suited for low power, n Industrial Housekeeping Supplies space constrained automotive/industrial applications. The n Low Power 12V to 5V Conversion device is short-circuit and overtemperature protected, and L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks is available in thermally enhanced 12-pin MSOP and low and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the profile 3mm 4mm 12-pin DFN packages. property of their respective owners. Typical a T Efficient Regulated 5V Output 5V Efficiency vs Output Current OUT 90 400 V = 12V IN 1F 80 350 EFFICIENCY 70 300 + C C 60 250 LTC3245 50 200 V = 5V OUT V = 2.7V TO 38V V V IN OUT IN I UP TO 250mA OUT 40 150 SEL2 OUTS/ADJ 500k P LOSS 1F BURST PGOOD 10F 30 100 SEL1 GND 20 50 3245 TA01a 10 0 0.1 1 10 100 1000 I (mA) OUT 3245 TA01b 3245fa 1 For more information www.linear.com/LTC3245 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3245 a Te Maxi Mu M r a T (Note 1) Operating Junction Temperature Range (Notes 2, 3) V , SEL1, SEL2, BURST ............................ 0.3V to 38V IN (E-/I-Grade) ........................................ 40C to 125C V , OUTS/ADJ, PGOOD ............................ 0.3V to 6V OUT (H-Grade) ........................................... 40C to 150C I ......................................................................2mA PGOOD (MP-Grade) ........................................ 55C to 150C V Short-Circuit Duration ............................. Indefinite OUT Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) (MSE Only) ...........................................................300C p in c F T TOP VIEW TOP VIEW V 1 12 GND IN V 1 12 GND V 2 11 C IN IN V 2 11 C IN V 3 10 V IN OUT 3 13 V 13 10 V IN OUT + GND + 4 GND BURST 9 C BURST 4 9 C 5 8 SEL1 PGOOD SEL1 5 8 PGOOD SEL2 6 7 OUTS/ADJ SEL2 6 7 OUTS/ADJ MSE PACKAGE 12-LEAD PLASTIC MSOP DE PACKAGE T = 150C, = 40C/W JMAX JA 12-LEAD (3mm 4mm) PLASTIC DFN EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB GND T = 150C, = 43C/W JMAX JA EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB GND o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3245EDE PBF LTC3245EDE TRPBF 3245 12-Lead (3mm 4mm) Plastic DFN 40C to 125C LTC3245IDE PBF LTC3245IDE TRPBF 3245 12-Lead (3mm 4mm) Plastic DFN 40C to 125C LTC3245EMSE PBF LTC3245EMSE TRPBF 3245 12-Lead Plastic MSOP 40C to 125C LTC3245IMSE PBF LTC3245IMSE TRPBF 3245 12-Lead Plastic MSOP 40C to 125C LTC3245HMSE PBF LTC3245HMSE TRPBF 3245 12-Lead Plastic MSOP 40C to 150C LTC3245MPMSE PBF LTC3245MPMSE TRPBF 3245 12-Lead Plastic MSOP 55C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: