LT1617 Datasheet | Linear Technology

LT1617/LT1617-1 Micropower Inverting DC/DC Converters in SOT-23 Features s DESCRIPTIO s s s s s Low Quiescent Current: 20µA in Active Mode <1µA in Shutdown Mode Operates with VIN as Low as 1V Low VCESAT Switch: 250m V at 300m A Uses Small Surface Mount ponents High Output Voltage: Up to - 34V Tiny 5-Lead SOT-23 Package U APPLICATIO S s s s s LCD Bias Handheld puters Battery Backup Digital Cameras The LT®1617/LT1617-1 are micropower inverting DC/DC converters in a 5-lead SOT-23 package. The LT1617 is designed for higher power systems with a 350m A current limit and an input voltage range of 1.2V to 15V, whereas the LT1617-1 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 offtime 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 without the use of costly transformers. The LT1617’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. TYPICAL APPLICATION 1-Cell Li-Ion to - 15V Inverting Converter L1 22µH 5 VIN LT1617 4 C1 4.7µF SHDN GND 2 NFB 3 24.9k C3 0.22µF 1 SW D1 267k C2 4.7µF L2 22µH - 15V 12m A EFFICIENCY (%) VIN 2.5V TO 4.2V 75 70 65 60 55 C1: TAIYO YUDEN LMK316BJ475 C2: TAIYO YUDEN EMK316BJ475 C3: TAIYO YUDEN TMK316BJ224 L1, L2: MURATA LQH3C220K34 D1: MOTOROLA MBR0530 1617/-1 TA01 50 0.1 Efficiency VIN = 4.2V VIN = 2.5V 1 10 LOAD CURRENT (m A) 30 1617/-1 TA01a LT1617/LT1617-1 ABSOLUTE (Note 1) AXI U RATI GS U W U PACKAGE/ORDER I FOR ATIO TOP VIEW SW 1...