LT1611 Datasheet | Linear Technology

LT1611 Inverting 1.4MHz Switching Regulator in SOT-23 Features s s s s s s s s s s DESCRIPTIO Very Low Noise: 1m VP- P Output Ripple - 5V at 150m A from a 5V Input Better Regulation Than a Charge Pump Effective Output Impedance: 0.14Ω Uses Tiny Capacitors and Inductors Internally pensated Fixed Frequency 1.4MHz Operation Low Shutdown Current: <1µA Low VCESAT Switch: 300m V at 300m A Tiny 5-Lead SOT-23 Package U APPLICATIO S s s s s s The LT®1611 is the industry’s first inverting 5-lead SOT-23 current mode DC/DC converter. Intended for use in small, low power applications, it operates from an input voltage as low as 1.1V and switches at 1.4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Its small size and high switching frequency enable the plete DC/DC converter function to consume less than 0.25 square inches of PC board area. Capable of generating - 5V at 150m A from a 5V supply or - 5V at 100m A from a 3V supply, the LT1611 replaces nonregulated “charge pump” solutions in many applications. The LT1611 operates in a dual inductor inverting topology which filters the input side as well as the output side of the DC/DC converter. Fixed frequency switching ensures a clean output free from low frequency noise typically present with charge pump solutions. No load quiescent current of the LT1611 is 3m A, while in shutdown quiescent current drops to 0.5µA. The 36V switch allows VIN to VOUT differential of up to 33V. The LT1611 is available in the 5-lead SOT-23 package. , LTC and LT are registered trademarks of Linear Technology Corporation. MR Head Bias Digital Camera CCD Bias LCD Bias Ga As FET Bias Positive-to-Negative Conversion TYPICAL APPLICATIO VIN 5V VIN L1A 22µH C2 1µF L1B 22µH D1 SW LT1611 NFB GND R2 10k R1 29.4k 1200p F SHDN C1 22µF + VOUT - 5V 150m A C3 22µF VOUT 20m V/DIV AC COUPLED LOAD CURRENT C1: AVX TAJB226M010 C2: TAIYO YUDEN LMK212BJ105MG C3: TAIYO YUDEN JMK325BJ226MM (1210 SIZE) D1: MBR0520 L1: SUMIDA...