LT1615 Datasheet | Linear Technology

LT1615/LT1615-1 Micropower Step-Up DC/DC Converters in Thin SOT Features s Low Quiescent Current: 20µA in Active Mode <1µA in Shutdown Mode s Operates with VIN as Low as 1V s Low VCESAT Switch: 250m V at 300m A s Uses Small Surface Mount ponents s High Output Voltage: Up to 34V s Low Profile (1mm) Thin SOTTM Package U APPLICATIO S s LCD Bias s Handheld puters s Battery Backup s Digital Cameras DESCRIPTIO The LT®1615/LT1615-1 are micropower step-up DC/DC converters in a 5-lead low profile (1mm) Thin SOT package. The LT1615 is designed for higher power systems with a 350m A current limit and an input voltage range of 1.2V to 15V, whereas the LT1615-1 is intended for lower power and single-cell applications with a 100m A current limit and an extended input voltage range of 1V to 15V. Otherwise, the two devices are functionally equivalent. Both devices feature a quiescent current of only 20µA at no load, which further reduces to 0.5µA in shutdown. A current limited, fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad range of load current. The 36V switch allows high voltage outputs up to 34V to be easily generated in a simple boost topology without the use of costly transformers. The LT1615’s low off-time of 400ns permits the use of tiny, low profile inductors and capacitors to minimize footprint and cost in space-conscious portable applications. , LTC and LT are registered trademarks of Linear Technology Corporation. Thin SOT is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO 1-Cell Li-Ion to 20V Converter for LCD Bias VIN 2.5V TO 4.2V L1 10µH D1 R1 2M SHDN C1 R2 4.7µF 130k C1: TAIYO YUDEN LMK316BJ475 C2: TAIYO YUDEN TMK316BJ105 D1: MOTOROLA MBR0530 L1: MURATA LQH3C100K24 20V 12m A C2 1µF 1615/-1 TA01 EFFICIENCY (%) Efficiency 80 VIN = 4.2V VIN = 2.5V VIN = 3.3V 50 0.1 10...