| Specifications | LTC3453 - Synchronous Buck-Boost High Power White LED Driver Data Sheet Linear Technology Corporation |
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| Specifications | LTC3453 - Synchronous Buck-Boost High Power White LED Driver Data Sheet Linear Technology Corporation |
| Business section |
| Specifications | LTC3453 - Synchronous Buck-Boost High Power White LED Driver Data Sheet Linear Technology Corporation |
| Suggested Link Details/Purchase | |
| Content | LTC3453 1 3453fa VIN (V) 2.7 LED POWER EFFICIENCY P LED /P IN (%) 100 90 80 70 50 60 INPUT CURRENT (mA) 180 160 140 120 80 100 4.7 3453 TA01b 3.13.53.95.54.35.1 ILED = 150mA TA = 25°C IIN EFFICIENCY APPLICATIOSU FEATURES TYPICAL APPLICATIOU DESCRIPTIOU The LTC®3453 is a synchronous buck-boost DC/DC con- verter optimized for driving up to 4 white LEDs at a combined current of up to 500mA from a single Li-Ion battery input. The regulator operates in either synchro- nous buck, synchronous boost, or buck-boost mode, depending on input voltage and LED maximum forward voltage. Optimum efficiency is achieved using a propri- etary architecture that determines which LED requires the largest forward voltage drop at its programmed current, and regulates the common output rail for lowest dropout. Efficiency of 90% can be achieved over the entire usable range of a Li-Ion battery (2.7V to 4.2V). LED current is programmable to one of four levels (includ- ing shutdown) with dual current setting resistors and dual enable pins. In shutdown, the supply current is only 6µA. A high constant operating frequency of 1MHz allows the use of a small external inductor. The LTC3453 is offered in a low profile (0.75mm) thermally enhanced 16-lead (4mm x 4mm) QFN package. ■Cell Phones ■Digital Cameras ■PDAs ■Portable Devices ■High Efficiency: 90% Typical Over Entire Li-Ion Battery Range ■Wide VIN Range: 2.7V to 5.5V ■Up to 500mA Continuous Output Current ■Internal Soft-Start ■Open/Shorted LED Protection ■LED Current Matching Typically <2% ■Constant Frequency 1MHz Operation ■Low Shutdown Current: 6µA ■Overtemperature Protection ■Small Thermally Enhanced 16-Lead (4mm x 4mm) QFN Package Synchronous Buck-Boost High Power White LED Driver High Efficiency Torch/Flash LED Driver Torch Mode Efficiency vs VIN EN1 (TORCH) GNDPGNDGND D1: LUMILEDS LXCL-PWF1 L1: VISHAY DALE IDCS-2512 VIN LED1 LED2 LED3 LED4 D1 3453 TA01a VC EN10.1µF EN2EN2 (FLASH) ISET1 8.25k 1% ISET2 3.48k 1% EN1EN2ILED 0 1 0 1 0 0 1 1 0 (SHUTDOWN) 150mA 350mA 500mA SW1SW2VOUTPVIN VIN1-CELL Li-Ion 2.7V to 4.2V LTC3453 1MHz BUCK-BOOST 2.2µF4.7µF L1 4.7µH 150mA/500mA , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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| Following Datasheets | 3470fc (20 pages) 3476fa-1 (12 pages) 3477fb (20 pages) 3494fb_1 (12 pages) 35-1_2 (2 pages) 35_2 (1 pages) 3500fb (28 pages) 3508fb (24 pages) 350_appnote (1 pages) 350_appnote2 (1 pages) |
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